Patent ID: 6319978
Filing Date: 2001-11-20
Classification: C08L,C09J

Abstract:
In an aqueous vinyl acetate/ethylene pressure sensitive polymer adhesive comprised of polymerized units of vinyl acetate, ethylene, a carboxyl containing monomer and from 0-20 wt % of one or more additional ethylenically unsaturated copolymerizable monomers, said aqueous vinyl acetate/ethylene pressure sensitive polymer adhesive formed by emulsion polymerization in the presence of a stabilizing system, the improvement for enhanced pressure sensitivity of the vinyl acetate/ethylene polymer which comprises:a polymer having an ethylene content from 45 to 65% by weight and a Tg of from -25 to -70.degree. C.; and,a tensile storage modulus measured at one hertz encompassed within the points on a plot of tensile storage modulus and temperature of from 1 times 10.sup.6 and 4 times 10.sup.9 dynes/cm.sup.2 at a temperature of -20.degree. C. and 1 times 10.sup.7 dynes/cm.sup.2 and 1.times.10.sup.3 dynes/cm.sup.2 at a temperature of 50.degree. C.