Investigations of UV-crosslinkable water-soluble acrylic pressure-sensitive adhesives

摘要

Titled adhesives based on acrylic acid(AA)or beta-acryloyloxy propionic acid(APA)and butyl aerylate(BA)were synthesized.Unsaturated photoinitiators were introduced into their chains,namely:4-acryloyloxy ben-zophenone(ABP),2-hydroxy-l-[4-(2-acryloyloxy-ethoxy)phenyl]-2-methyl--1-propanone(ZLI3331)or phenyl-l(l-acryloyloxy)-cyclohexyl ketone(PAC).These products were plastified with polyoxyethylene glycols(PEG)differing in molecular weight(400 -1010 Da)or polyoxypropylene glycols(PPG).The effects of chemical compositions of comonomers,plasticizer types and contents as well as effect of pH on the following basing properties of obtained aqueous adhesive systems(PSA)were investigated:water solubility,cohesion and adhesion.Dependence of water solubility of selected plasticized PSAs on UV curing time was also determined.PSA based on 70 wt.% of AA and 30 wt.% of BA with addition of 0.5 wt.% of ABP as photoinitiator/comonomer,plastified with 60 - 120 phr of PPG has been found as optimal.