Abstract
Synthesis of photoreactive solvent-free acrylic pressure-sensitive adhesives in the recovered system The present paper discloses a novel photoreactive solvent-free acrylic pressure-sensitive adhesive (PSA) systems, especially suitable for the so much adhesive film applications as the double-sided, single-sided or carrier-free technical tapes, self-adhesive labels, protective films, marking and sign films and wide range of medical products. The novel photoreactive solvent-free pressure-sensitive adhesives contain no volatile organic compounds (residue monomers or organic solvent) and comply with the environment and legislation. The synthesis of this new type of acrylic PSA is conducted in common practice by solvent polymerisation. After the organic solvent are removed, there remains a non-volatile, solvent-free highly viscous material, which can be processed on a hot-melt coating machine at the temperatures of about 100 to 140°C.
Highlights
Solvent-free pressure-sensitive adhesives potentially offer significant economic and environmental advantages over crosslinkable solvent systems
The pressure-sensitive adhesive (PSA) are aggressive and permanently tacky at room temperature, and adhere to surfaces by the application of light finger pressure[2]. The combination of these properties provide compositions that are melts at elevated temperatures and cool to form a permanently tacky solid coating that adheres to contact. These PSA are most commonly used applied to various substrates, such as paper, cloth, metal, and plastic films, which are converted into tapes and labels for use in the packaging industry, in marking, sealing and bonding applications, or for use in the health and pharmaceutical industry, in bandages or transdermal drug delivery systems[3]
The following work was study the influence of significant steps in the UV technology of photoreactive solventfree acrylic PSA such as solvent-borne synthesis in ethyl acetate of photoreactive acrylic PSA, the degassing process under vacuum, using of the recovered solvent ethyl acetate for the new synthesis again, UV crosslinking of coated PSA layers and investigation of the main layers properties as tack, adhesion, cohesion and shrinkage
Summary
Solvent-free pressure-sensitive adhesives potentially offer significant economic and environmental advantages over crosslinkable solvent systems. The PSA are aggressive and permanently tacky at room temperature, and adhere to surfaces by the application of light finger pressure[2] The combination of these properties provide compositions that are melts at elevated temperatures and cool to form a permanently tacky solid coating that adheres to contact. Acrylic hot melts are the ecologically beneficial alternative to the common solvent-borne acrylic adhesives[8] The production of this new type of acrylic PSA is conducted in common industrially practice by solvent polymerisation. The degassing in the reactor after the polymerisation process seems to be a practicable way to produce acrylic hot melts from solvent-borne systems. UV crosslinking, is mostly limited to thin PSA layers[10]
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