Pressure sensitive adhesive compositons

摘要

Disclosed are removable pressure sensitive adhesive compositions (PSAs) useful with facestocks and/or packaging labels designed to be removed in the recycling of polymeric packaging. The PSAs of the invention include (a) at least one monomer which may undergo free radical polymerization and whose homopolymer has a glass transition temperature of less than or equal to 10° C., (b) at least one mono-olefinically unsaturated monomer having aldehyde or ketone functionality, and (c) an effective amount of at least one polyhydrazide crosslinker having hydrazine functionality. The PSA composition of the invention exhibits a peel adhesion value of between about 0.4 lbs/in (70 N/m) and about 4 lbs/in (700 N/m), and the percent film remaining on the polymeric packaging after a sink-float testing is 0% to about 8%.

主权项

1. A filmic facestock material for polymeric packaging comprising:
a pressure sensitive adhesive composition comprising a monomer mixture, wherein the monomer mixture comprises (a) at least one monomer that is free radical polymerizable and whose homopolymer has a glass transition temperature of less than or equal to 10° C., (b) greater than 0.1 wt. % to 1 wt. % based on the weight of the monomer mixture of at least one mono-olefinically unsaturated monomer having aldehyde or ketone functionality, and (c) at least one polyhydrazide crosslinker having hydrazine functionality; wherein the pressure sensitive adhesive composition exhibits a peel adhesion value of between about 0.4 lbs/in (70 N/m) and about 4 lbs/in (700 N/m); and wherein a percent film remaining on the polymeric packaging after a sink-float testing is 0% to about 8%.