Polyethylene Waxes Research Articles

Processing and Properties of Melt Processable UHMW‐PE Based Fibers Using Low Molecular Weight Linear Polyethylene's

AbstractThe rheology, solid state drawability, morphology, and mechanical properties of polyethylene blends containing ultrahigh molecular weight polyethylene (UHMW‐PE) and linear‐low molecular weight polyethylene waxes (PEwax) are explored. Addition of PEwax enables melt processing of UHMW‐PE and improves solid state drawability, providing opportunities in recycling of UHMW‐PE waste. Small angle X‐ray scattering results show that both PEwax and UHMW‐PE align fully in the drawing direction, irrespective whether the PEwax has an Mn below or above the critical molecular weight at which entanglements can form (Mc). Tensile moduli of drawn specimen are in accordance to the Irvine–Smith model confirming that both UHMW‐PE and PEwax align in the drawing direction and no chain slip occurs toward zero strain and both UHMW‐PE and PEwax fractions, irrespective of their molecular weight, contribute fully to the modulus. Tensile strength of the blends scales according to the rule of mixtures where PEwax below Mc scale toward zero and those above Mc do contribute to the tensile strength. Modulus hence can be regarded as insensitive to the molecular weight of the PEwax used, whereas strength does show to be sensitive to the molecular weight of the PEwax.

Finely Tuned α,α′-Bis(arylimino)-2,3:5,6-bis(pentamethylene)pyridine-Based Practical Iron Precatalysts for Targeting Highly Linear and Narrow Dispersive Polyethylene Waxes with Vinyl Ends

One-pot template construction of α,α′-bis(arylimino)-2,3:5,6-bis(pentamethylene)pyridyl iron chlorides achieved by reacting α,α′-dioxo-2,3:5,6-bis(pentamethylene)pyridine and the corresponding anilines along with the respective iron chloride in acetic acid provided yields of 26–76%. All these complexes were characterized by FT-IR, elemental analysis, 1H NMR, and X-ray diffraction analysis. Distorted-square-pyramidal geometries are observed in the molecular structures of Fe1 and Fe6, respectively. When MAO or MMAO is used as a cocatalyst, Fe1–Fe5 display a high activity of 107 g with highly linear, low-molecular-weight, and narrow-polydispersity polyethylenes (PEs) being obtained by ethylene polymerization. The catalytic activity of Fe1 reached a maximum activity ((3.81–3.93) × 107 g of PE (mol of Fe)−1 h–1) by using the cocatalyst MAO or MMAO at Al/Fe ratio of 5000. All of the synthesized iron precatalysts Fe1–Fe8 containing sterically ortho benzhydryl and aryl (2,4,6-substituents of the aryl ring) groups...

Structuraland Mechanical Properties of Polymer—Paraffin Composites

The deformation—strength (strength and plasticity) and dilatometric properties (contraction or volume shrinkage) of binary composites of food paraffin P-1 and the polymers low-pressure polyethylene, polyethylene waxes, atactic polypropylene, and copolymers of ethylene and vinylacetate are investigated. The structural and mechanical properties of the polymer—paraffin composites are plotted as functions of composition. The dependences of these properties on the content of modifying component in the P-1 composites are compared.

Characterization of odorants in waxes for hot melt adhesives using sensory and instrumental analyses

Waxes are important additives in hot melt adhesives for improving the properties of the final product such as the melting point or viscosity. Up to one third of the formulation of the final product consists of waxes. For this purpose usually polyethylene (PE) waxes or Fischer-Tropsch (FT) waxes are used. Waxes affect the overall smell of hot melt adhesives, and often in a negative way. In our study the overall odor of five different waxes made by different manufacturing methods was characterized in order to classify the samples according to their overall smell. First of all the samples were evaluated by a trained sensory panel at room temperature and after heating to 80 °C using descriptive analyses. Then the volatiles responsible for the overall smell of the samples were directly extracted using thermal desorption in combination with cryo-focusing and analyzed by gas chromatography-mass spectrometry-olfactometry (GC-MS/O). Moreover, the volatiles in the waxes were recovered using solvent extraction and isolated by solvent assisted flavour evaporation (SAFE). The most dominant odorants were then characterized by GC-O and odor extract dilution analysis (OEDA). Using these approaches 39 odorants having different chemical structures were successfully identified for the first time in waxes used as additives in hot melt adhesives. These odorants included alcohols with tallowy, soapy odor qualities such as 2-methyl-2-decanol, 2-methyl-2-dodecanol, and 1-undecanol, as well as a range of lactones such as γ-decalactone and γ-undecalactone having soapy, peach-like odor descriptions. The attributes of the odorants detected using GC analyses correlated with the descriptive analyses of the human sensory panel. This study indicates that the odor impact of waxes to hot melt adhesives depends on the manufacturing method of each single wax and that there is no clear trend for the preferential usage of PE or FT waxes.

Bis(imino)pyridines fused with 6- and 7-membered carbocylic rings as N,N,N-scaffolds for cobalt ethylene polymerization catalysts.

The unsymmetrical diketone, 1,2,3,7,8,9,10-heptahydrocyclohepta[b]quinoline-4,6-dione, based on a central pyridine unit fused by both 6- and 7-membered rings, has been synthesized via a sequence of reactions including ruthenium-catalyzed coupling cyclization. Templating this diketone with a mixture of cobalt(ii) chloride hexahydrate and the corresponding aniline in acetic acid at reflux afforded five examples of carbocyclic-fused bis(arylimino)pyridine-cobalt(ii) chlorides (aryl = 2,6-Me2Ph Co1, 2,6-Et2Ph Co2, 2,6-i-Pr2Ph Co3, 2,4,6-Me3Ph Co4, 4-Me-2,6-Et2Ph Co5) in good yield. All cobalt complexes have been fully characterized including by 1H NMR spectroscopy which reveals broad but assignable paramagnetically shifted peaks. The molecular structures of Co1, Co3 and Co4 highlight the inequivalency of the two fused rings with the cobalt center adopting a distorted trigonal bipyramidal geometry. Treatment of Co1-Co5 with MAO gave highly active catalysts (up to 5.03 × 106 g PE mol-1 (Co) h-1 at 40 °C, with Co4 > Co5 > Co1 > Co2 > Co3) for ethylene polymerization generating strictly linear vinyl-terminated polymers with low molecular weights (Mw range: 1.53-22.77 kg mol-1). By comparison, polymerizations conducted using Co1-Co5/MMAO were less active and displayed a lower selectivity for unsaturated polymers. Common to both MAO and MMAO, the most sterically hindered precatalyst Co3 gave the highest molecular weight polymer of the series (up to 22.77 kg mol-1) but exhibited the lowest activity.

Effect of fatty acid-based anionic surfactants on the emulsion properties of self-emulsifying poly(ethylene-co-acrylic acid) waxes

Self-emulsifying polyethylene waxes (SE-PEA) were prepared by saponification of KOH with poly(ethylene-co-acrylic acid) (PEA) wax in the presence of surfactants. The viscosity, softening point and penetration of SE-PEA were compared according to the structure of surfactants. After simple preparation of the emulsions, the storage stability, particle size and accelerated stability were evaluated. Using the mixture of nonionic and unsaturated fatty acid emulsifiers, excellent emulsion stabilities and drop emulsion size of <3μm were achieved. The emulsion of SE-PEA prepared using a fatty acid surfactant having unsaturated groups showed stable emulsion characteristics because of the double bond on hydrophobic chain.

Moisture resistance study on PE-wax and EBS-wax modified warm mix asphalt using chemical and mechanical procedures

Global warming, environmental concerns, and energy prices have led to increased use of wax additives to produce warm mix asphalt (WMA) as an alternative to hot mix asphalt (HMA). Despite many advantages, moisture susceptibility of WMAs is a legitimate concern. Although there have been many studies about moisture susceptibility of warm mix additives, mixtures containing ethylene-bis-stearamide (EBS) and polyethylene (PE) waxes have been less studied. In this research, moisture susceptibility of asphalt mixtures containing PE and EBS were evaluated. Furthermore, rheological and chemical evaluations of EBS and PE-wax modified binders were evaluated using dynamic shear rheometry and Fourier infrared spectroscopy, respectively. Moisture susceptibility was assessed using the modified Lottman test and the effects of aggregate type and production temperature were also evaluated. Results indicate improved moisture resistance for mixtures containing EBS. Additionally, the effect of PE-wax on moisture susceptibility was observed to be temperature dependent showing adverse effects at higher compaction temperatures.

Comprehensive Analysis of Oxidized Waxes by Solvent and Thermal Gradient Interaction Chromatography and Two-Dimensional Liquid Chromatography

This report addresses the comprehensive analysis of oxidized/functionalized polyethylene waxes according to chemical composition and molar mass by selective chromatographic methods. For the first time, tailored high-temperature interaction chromatography in solvent gradient (HT-SGIC) and thermal gradient (HT-TGIC) modes are used for the chemical composition separation of these materials. Separation protocols are developed using three model wax samples with different degrees of oxidation. For the chromatographic separations polar silica gel is used as the stationary phase. Solvent gradients of decane and cyclohexanone are used in HT-SGIC at 110 °C to separate the bulk waxes into several heterogeneous fractions according to polarity and the type of functionality. Column temperature and gradient manipulation are shown to influence chromatographic resolution and retention. The HT-SGIC investigations are complemented by HT-TGIC separations where a solvent mixture of decane and cyclohexanone is used as the mobile phase in isocratic mode. It is shown that HT-SGIC and HT-TGIC provide different types of separation, however, both are predominantly based on differences in functionality. To provide comprehensive information on chemical composition (functionality) and molar mass, HT-SGIC and HT-TGIC are coupled to HT-SEC, using ortho-dichlorobenzene as the second dimension mobile phase. Clear differences between oxidized and nonoxidized waxes are detected in HT-2D-LC providing comprehensive information on the molecular heterogeneity of these materials.

Vinyl/Vinylene functionalized highly branched polyethylene waxes obtained using electronically controlled cyclohexyl‐fused pyridinylimine‐nickel precatalysts

ABSTRACTA series of 8‐(2,6‐dibenzhydryl‐4‐R‐phenylimino)‐5,6,7‐trihydroquinoline ligands have been prepared in which the nature of 4‐R substitutions vary from electron withdrawing to electron donating. The treatment with NiCl2.6H2O or (DME)NiBr2 afforded the corresponding complexes of nickel chloride (4‐R = Me Ni1, Et Ni2, tBu Ni3, CHPh2 Ni4, Cl Ni5, and F Ni6) and nickel bromide (4‐R = Me Ni7, Et Ni8, tBu Ni9, CHPh2 Ni10, Cl Ni11, and F Ni12). X‐ray diffraction study of complexes Ni3, Ni6, and Ni10, revealed that Ni3.1/2H2O and Ni6.H2O adopted unsymmetrical and symmetrical chloride‐bridged dinuclear structures respectively, while Ni10.H2O is found as mononuclear specie forming distorted‐square planer geometry. In the presence of either diethylaluminum chloride (Et2AlCl) or modified methylaluminoxane (MMAO), all the nickel complexes (Ni1–Ni12) displayed high activities (up to 1.91 × 106 g(PE) mol (Ni)−1h−1. Highly branched polyethylene waxes with low molecular weights (Mw ≤ 2.6 kg/mol) and narrow molecular weights distributions (Mw/Mn ≤ 1.96) incorporated with vinylene and vinyl groups were obtained. The effects of 4‐R substitutions to the nickel chloride and bromide pre‐catalysts and reaction conditions on the catalytic performance and the properties of the resulting polyethylene were the subject of a detail investigation. The positive influences of using electron‐withdrawing 4‐R substitutions and bromides were observed. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018, 56, 1269–1281

Methylene-bridged bimetallic bis(imino)pyridine-cobaltous chlorides as precatalysts for vinyl-terminated polyethylene waxes.

Four examples of phenol-substituted methylene-bridged bis(imino)pyridines, CH(C6H4-4-OH){2'-(4-C6H2-2,6-R22N[double bond, length as m-dash]CMe)-6'-(2'',6''-R12C6H3N[double bond, length as m-dash]CMe)C5H3N}2 [R1 = R2 = Me L1, R1 = R2 = Et L2, R1 = Et, R2 = Me L3, R1 = iPr, R2 = Me L4], have been synthesized and fully characterized. Treatment of L1-L4 with two equivalents of cobaltous chloride affords the bimetallic complexes, [(L)Co2Cl4] (L = L1Co1, L2Co2, L3Co3, L4Co4), in good yield. The molecular structure of Co1 shows the two metal centers to be separated by a distance of 13.339 Å with each cobalt displaying a distorted trigonal bipyramidal geometry. On activation with either MAO or MMAO, Co1-Co4 exhibited high activities for ethylene polymerization (up to 1.46 × 107 g(PE) mol-1(Co) h-1 at 50 °C) with their relative values influenced by the steric properties of the N-aryl groups: Co1 > Co3 > Co4 > Co2. Highly linear polyethylenes incorporating high degrees of vinyl end-groups are a feature of all the materials produced with the molecular weights of the MAO-promoted systems (Mw range = 2-8 kg mol-1) generally higher than seen with MMAO (Mw range = 1-3 kg mol-1), while the distributions using MMAO are narrower (PDI < 2.0).

Pellets of magnetized polyethylene (Fe3O4/PE) wax from gamma irradiated polyethylene: synthesis and characterization

Different size of microcrystalline polyethylene (PE) waxes containing iron oxide magnetite (Fe3O4) was manufactured by the change of Fe3O4 content (%). Magnetite Fe3O4 used as filler, the magnetic moment of Fe3O4 in order to enhance the crystallinity of polyethylene (PE) wax pellets. PE/Fe3O4 wax irradiated by γ-rays at dose 50 kGy under ambient conditions. Pelletization process occurred by heated wax iron oxide composite at 120 °C and drops wise in an ultrasonic bath. The dependence of pellets size on temperature was determined. Effect of irradiation dose (50 kGy) and Fe3O4 content on surface hardness (shore-D), melt flow index and melting point (T m ) of magnetized PE wax pellets was investigated. The results showed that an irradiation dose of 50 kGy causes increase in the melting point of pellets without Fe3O4 from 110 to 120 °C, while introducing 30% of Fe3O4 increasing the melting point of pellets from 110 to 147 °C. The morphology of pellets surface was investigated by scanning electron microscopy.

Vinyl‐Polyethylene Waxes with Narrow Dispersity Obtained by Using a Thermally Robust [Bis(imino)trihydroquinolyl]chromium Catalyst

Five structurally related chromium(III) complexes [2‐(ArNCMe)‐8‐(NAr)C9H8N]CrCl3 (Ar = 2,6‐Me2Ph: Cr1; 2,6‐Et2Ph: Cr2; 2,6‐iPr2Ph: Cr3; 2,4,6‐Me3Ph: Cr4; 2,6‐Et2‐4‐MePh: Cr5), each bearing an unsymmetrical bis(imino)trihydroquinoline ligand, were synthesized in good yield and fully characterized. The molecular structure of Cr2 reveals a distorted octahedral geometry at the metal center with the sterically bulky N,N,N ligand adopting a mer configuration. On activation with methylaluminoxane (MAO) or modified MAO, Cr1–Cr5 were highly active catalysts for ethylene polymerization operating most effectively at 80 °C [up to 15.96 × 106 g (PE)·mol–1 (Cr)·h–1]; even at 100 °C, the activity was still good [2.92 × 106 g (PE)·mol–1 (Cr)·h–1]. Highly linear polyethylene waxes of low molecular weight and narrow molecular weight distribution (polydispersity index: 1.1–1.8), incorporating predominantly vinyl/methyl and some methyl/methyl end groups were obtained. The influence of steric/electronic changes to the precatalyst and polymerization reaction parameters on the catalytic activity and the properties of the polymer product were the subject of a detailed investigation.

Effect of new type of synthetic waxes on reduced production and compaction temperature of asphalt mixture with reclaimed asphalt

Lower mixing and paving temperatures of asphalt mixtures, which are an important issue in recent years, with respect to increased energy demand of civil engineering structures during their processing, allow reduction of this demand and result in minimized greenhouse gas production. In present time, there are many possibilities how to achieve reduction of production temperature during the mixing and paving of an asphalt mixture. The existing solutions distinguish in target operating temperature behaviour which has to be achieved in terms of good workability. This paper is focused on technical solutions based on use of new types of selected synthetic and bio-based waxes. In case of bio-based additive sugar cane wax was used, which is free of paraffins and is reclaimed as waste product during processing of sugar cane. The used waxes are added to bituminous binder in form of free-flowing granules or fine-grained powder. Synthetic waxes are represented by new series of Fischer-Tropsch wax in form of fine granules as well as by polyethylene waxes in form of fine-grained powder or granules. Those waxes were used to modify a standard paving grade bitumen dosed into asphalt mixture of ACsurf type containing up to 30 % of reclaimed asphalt (RA).

Molecular weight control of polyethylene waxes using a constrained imino‐cyclopenta[b]pyridyl‐nickel catalyst

ABSTRACTFive examples of nickel(II) bromide complexes bearing N,N‐imino‐cyclopenta[b]pyridines, [7‐(ArN)‐6,6‐Me2C8H5N]NiBr2 (Ar = 2,6‐Me2C6H3 (Ni1), 2,6‐Et2C6H3 (Ni2), 2,6‐i‐Pr2C6H3 (Ni3), 2,4,6‐Me3C6H2 (Ni4), 2,6‐Et2‐4‐MeC6H2 (Ni5)), have been prepared by the reaction of the corresponding ligand, L1–L5, with NiBr2(DME) (DME = 1,2‐dimethoxyethane). On crystallization from bench dichloromethane, Ni1 underwent adventitious reaction with water to give the aqua salt, [L1NiBr(OH2)3][Br] (Ni1'). The molecular structures of Ni1' and Ni3 have been structurally characterized, the latter revealing a bromide‐bridged dimer. On activation with either MMAO or Et2AlCl, Ni1, Ni2, Ni4, and Ni5, all exhibited high activities for ethylene polymerization (up to 3.88 × 106 g(PE) mol−1(Ni) h−1); the most sterically bulky Ni3 gave only low activity. Polyethylene waxes are a feature of the materials obtained which typically display low molecular weights (Mws), narrow Mw distributions and unsaturated vinyl and vinylene functionalities. Notably, the catalyst comprising Ni1/Et2AlCl produced polyethylene with the lowest Mw, 0.67 kg mol−1, which is less than any previously reported data for any class of cycloalkyl‐fused pyridine–nickel catalyst. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017, 55, 3494–3505

Achieving branched polyethylene waxes by aryliminocycloocta[b]pyridylnickel precatalysts: Synthesis, characterization, and ethylene polymerization

ABSTRACTCycloocta[b]pyridin‐10‐one was prepared to form the corresponding imino derivatives, which then reacted with (DME)NiBr2 to form 10‐aryliminocycloocta[b]pyridylnickel bromides (Ni1–Ni5). The new compounds were characterized by means of FT‐IR spectroscopy as well as elemental analysis and the organic ligands were also analyzed by the NMR measurements. Furthermore, the molecular structure of a representative complex Ni3 was determined by the single crystal X‐ray diffraction, indicating the distorted tetrahedral geometry around the nickel atom. Upon the activation with either methylaluminoxane (MAO) or diethylaluminium chloride (Et2AlCl), the title nickel complexes exhibited high activity in ethylene polymerization and produced polyethylene of low molecular weight (1.43–6.78 kg mol−1) and low dispersity (1.7–2.4), which suggests a single‐site catalytic system. More importantly, the microstructure of the resultant polyethylene (especially degree of branching) and certain physical properties, such as Tm values, can easily be modulated by selecting the proper substituents within the ligands and adjusting the polymerization conditions. This finding demonstrates that it is plausible to use a single catalyst for synthesizing different types of polyethylene on demand.10‐Aryliminocycloocta[b]pyridylnickel bromides (Ni1–Ni5), upon activation with either MAO or Et2AlCl, exhibited high activity towards ethylene polymerization and produced polyethylenes with low molecular weight (1.43–6.78 kg mol−1) and low dispersity (1.7–2.4). © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017, 55, 2601–2610

Polyisobutylene Oligomers as Tools for Iron Oxide Nanoparticle Solubilization

A series of terminally functionalized polyisobutylene (PIB) derivatives were synthesized and tested as agents for magnetic nanoparticle solubilization. PIB-bound catechol was found to be the best functionalized polyolefin at effecting such solubilization based on UV–vis spectroscopic absorbance measurements and thermogravimetric analysis. The PIB-modified magnetic nanoparticles obtained from grafting reactions contain up to 32 wt % of MNPs. They easily disperse in nonpolar and modestly polar organic solvents. The high loading (>50 wt %) of the PIB-modified magnetic nanoparticles even in alkane solvents makes the resulting solutions magnetically susceptible. This was illustrated by preliminary work where PIB-modified MNPs formed solutions with heptane that could be magnetically separated from water. These PIB-modified magnetic nanoparticles were also shown to be highly soluble in low melting polyethylene waxes and in liquid poly(α-olefin)s.

From polyethylene waxes to HDPE using an α,α'-bis(arylimino)-2,3:5,6-bis(pentamethylene)pyridyl-chromium(iii) chloride pre-catalyst in ethylene polymerisation.

Five examples of α,α'-bis(arylimino)-2,3:5,6-bis(pentamethylene)pyridyl-chromium(iii) chlorides (aryl = 2,6-Me2Ph Cr1, 2,6-Et2Ph Cr2, 2,6-i-Pr2Ph Cr3, 2,4,6-Me3Ph Cr4, 2,6-Et2-4-MePh Cr5) have been synthesized by the one-pot template reaction of α,α'-dioxo-2,3:5,6-bis(pentamethylene)pyridine, CrCl3·6H2O and the corresponding aniline. The molecular structures of Cr1 and Cr4 reveal distorted octahedral geometries with the N,N,N-ligand adopting a mer-configuration. On activation with an aluminium alkyl co-catalyst, Cr1-Cr5 exhibited high catalytic activities in ethylene polymerization and showed outstanding thermal stability operating effectively at 80 °C with activities up to 1.49 × 107 g of PE (mol of Cr)-1 h-1. Significantly, the nature of the co-catalyst employed had a dramatic effect on the molecular weight of the polymeric material obtained. For example, using diethylaluminium chloride (Et2AlCl) in combination with Cr4 gave high density/high molecular weight polyethylene with broad molecular weight distributions (30.9-39.3). By contrast, using modified methylaluminoxane (MMAO), strictly linear polyethylene waxes of lower molecular weight and narrow molecular weight distribution (1.6-2.0) were obtained with vinyl end-groups.

Selected thermal properties of polyethylene waxes

Selected thermal properties of different types of polyethylene waxes, i.e. by-products formed in ethylene low-pressure polymerization process, physically and chemically modified waxes are presented in the study. Temperatures of phase transitions and relevant thermal effects were defined using DSC method. Additionally, drop point and penetration of waxes were determined. It was established that fractionation of waxes (physical modification) causes increase in their crystallinity and oxidation (chemical modification) decreases ability for crystallization.

Controlling the molecular weights of polyethylene waxes using the highly active precatalysts of 2-(1-aryliminoethyl)-9-arylimino-5,6,7,8-tetrahydrocycloheptapyridylcobalt chlorides: synthesis, characterization, and catalytic behavior.

A series of 2-(1-aryliminoethyl)-9-arylimino-5,6,7,8-tetrahydrocycloheptapyridylcobalt chlorides were synthesized and characterized using FT-IR and elemental analysis, and the molecular structures of complexes , and were confirmed to present a pseudo-square-pyramidal or trigonal-bipyramidal geometry around the cobalt center using single-crystal X-ray diffraction. Upon activation with either methylaluminoxane (MAO) or modified methylaluminoxane (MMAO), all cobalt precatalysts gave high activities up to the level of 10(7) gPE mol(-1) (Co) h(-1) toward ethylene polymerization, being one of most active cobalt-based precatalysts. In comparison with cobalt analogues, the title precatalysts generally possessed longer lifetime along with good thermo-stability; moreover, the resultant polyethylenes were highly linear and unimodal in most cases.

Production of spherical wax and polyolefin microparticles by melt emulsification for additive manufacturing

Melt emulsification is a top-down approach that so far has been applied in the food industries (cf. homogenization of milk) and in pharmaceutical applications. Within this contribution the applicability of the process for the production of spherical polymer microparticles will be outlined. Size reduction of the polymer raw melt emulsion was realized in a rotor–stator-device. The process is characterized for paraffin and polyethylene (PE) waxes in aqueous environment using Tween 85 as an emulsifier. Process temperature and dispersed phase viscosity have the largest impact on the particle size distribution (PSD): decreasing temperature and viscosity leads to smaller particles. The suitability of the melt emulsification process for technical polymers is demonstrated for polypropylene (PP) emulsified in a continuous hexadecane phase. Polymer particles obtained by the proposed method are promising candidates for advanced powders for additive manufacturing processes like selective laser beam melting (LBM) of polymers. The LBM processability of the obtained PP powders is demonstrated by production of sintered layers.