Heat sealable articles treated with vinyl halide polymer latices

Claim 1

A heat-sealable article comprising a substrate coated or impregnated with an overpolymer latex containing (1) from about 10% to about 90% by weight of the overpolymer latex of a core polymer of polyvinyl chloride, and (2) from about 90% to about 10% by weight of the overpolymer latex of a shell on said core polymer, said shell being overpolymerized on said core polymer and containing, in polymerized form, one or more polymerizable monomers selected from the group consisting of (a) α,β-olefinically unsaturated carboxylic acids containing from 2 to 12 carbon atoms; (b) amides having the formula ##STR6## wherein R is hydrogen or an alkyl group containing from 1 to 4 carbon atoms and R' and R" are hydrogen or an alkyl group containing from 1 to 8 carbon atoms; (c) N-alkylol and N-alkoxyalkyl amides having the formula ##STR7## wherein R is hydrogen or an alkyl group containing from 1 to 4 carbon atoms, R' is hydrogen or a hydrocarbon radical containing from 1 to 12 carbon atoms, and n is an integer from 1 to 4; and (d) esters of acrylic acid and methacrylic acid having the formula ##STR8## wherein R is hydrogen or a methyl group and R' is an alkyl radical containing from 1 to 12 carbon atoms and wherein said shell contains at least one monomer selected from (c), said heat-sealable article being curable at temperatures substantially below 300° F. without the use of curing agents and being substantially free of discoloration.