Butyl acrylate/4-acryloyloxy benzophenone copolymers as photoreactive UV-crosslinkable pressure-sensitive adhesives

Abstract

Butyl acrylate/4-acryloyloxy benzophenone copolymers as photoreactive UV-crosslinkable pressure-sensitive adhesives It has previously been shown that copolymers of butyl acrylate with 4-acryloyloxy benzophenone can be used as pressure-sensitive adhesives (PSAs). This paper presents the synthesis and application of a solvent-borne polymer system for the preparation of photoreactive UV-crosslinkable acrylic pressure-sensitive adhesives. Butyl acrylate/benzophenone copolymers with molecular mass in the range 180 000 to 480 000 Dalton were prepared by carrying out free-radical solution polymerization. These copolymers were found to be tacky but in some cases to possess insufficient cohesive strength after UV-crosslinking to be useful as PSAs. The other copolymers resulted in materials with the balance of cohesive and adhesive characteristics required of good PSAs. Some of the parameters affecting the pressure-sensitive adhesive properties of the copolymers are the concentration of 4-acryloyloxy benzophenone, the molecular mass of the polymeric components, the UV-reactivity, and properties such as tack, peel adhesion, and cohesion.

Rational Design of Waterborne Polyurethane Pressure Sensitive Adhesives for Different Working Temperatures

“…Different balances between the liquid-like component and solid-like component can lead to different PSA performances [11][12][13][14][15][16][17].…”

“…It is found that high performance PSA must have a proper combinational property of both liquid-like (viscous part) and solid-like (elastic part), and the liquid-like means a low modulus of elasticity and a high dissipation of viscosity, whereas the solid-like means a high modulus of elasticity and a low dissipation [ 8 , 10 ]. Different balances between the liquid-like component and solid-like component can lead to different PSA performances [ 11 , 12 , 13 , 14 , 15 , 16 , 17 ].…”

“…What is more, the flexible adjustment of polymeric chain segments of WPU also provides a means to control the molecular structure of polymer and the composition of adhesive film on a micro scale. Polymers with optimized physically or chemically cross-linked structure can offer relatively high-performance PSA [ 3 , 11 , 14 ]. Many works have been focused on the preparation of general WPU-PSAs by adjusting the crosslinking of WPU [ 2 , 4 , 19 ].…”