Abstract
A series of pressure-sensitive adhesives (PSA) were prepared by emulsion polymerization in order to obtain a PSA that meet with the current label market requirements. For it, the effect of the incorporation of acrylonitrile (ACN) as hard monomer was investigated in a n-butyl acrylate (n-BA) and acrylic acid (AA) system. Great differences were found in the adhesive performance according to the ACN weight ratio. Its increased resulted in a considerable rise in the average sol molecular weight and in the glass transition temperature. This was reflected in a decrease of adhesion forces (peel resistance and tack) and an increase of the cohesion forces (shear resistance). Moreover, the incorporation of the minimum amount of ACN studied showed a great change in the elastic modulus determined by dynamic shear resistance with respect to the based formulation that did not contain ACN. Finally, the ice bucket test was carried out to check the adhesive performance in cold and wet environments.
Highlights
IntroductionAcrylic pressure-sensitive adhesives (PSA) have wide market in fields such as tapes, labels or protective films because of their excellent adhesive properties, resistance to UV light and a good aging performance, among others [1]
Adhesive Properties of Water-BasedAcrylic pressure-sensitive adhesives (PSA) have wide market in fields such as tapes, labels or protective films because of their excellent adhesive properties, resistance to UV light and a good aging performance, among others [1]
The introduction of 2 phm of ACN monomer in the formulation caused a slight increase in particle size, which was reflected in a certain decrease in viscosity
Summary
Acrylic pressure-sensitive adhesives (PSA) have wide market in fields such as tapes, labels or protective films because of their excellent adhesive properties, resistance to UV light and a good aging performance, among others [1]. They are obtained by free radical addition polymerization of alkyl esters of acrylic acid. These monomers can be classified into functionals, soft and hard monomers. In a typical formulation, the soft monomers constitute from about 50–90 wt % They have a high molecular weight and a low homopolymer glass transition temperature (Tg ) to ensure a soft and tacky film. The homopolymer of these hard monomers have Tg greater than 30 ◦ C, such as methacrylates, styrene, acrylonitrile (ACN), vinyl acetate, vinil chloride, vinylidene chloride, and butadiene [2,3]
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