Non-corrosive, low volatiles-containing pressure sensitive adhesive
AssigneeAdhesives Research, Inc.
InventorsMichael J. Zajaczkowski, Barbara A. Stutzman
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Abstract
A novel high performance pressure sensitive adhesive composition is provided comprised of a phase separated graft copolymer comprised of a polymerized acrylic or methacrylic acid ester backbone having grafted thereon pendant polymeric moieties such as polystyrene or poly-alpha-methylstyrene. The average number of carbon atoms present in the ester portion of the backbone ranges from 2.5 to 3.5. The composition is non-corrosive and has a low volatile content.
Claims20
A normally tacky non-polar monomer-containing phase separated graft copolymer having pressure sensitive adhesive properties comprised of a backbone polymer having a polymeric moiety grafted thereto, comprising the reaction product of
- (1) at least one A monomer consisting of a monomeric acrylic or methacrylic acid ester of a non-tertiary alcohol, said alcohol having from 1 to 3 carbon atoms,
- (2) at least one B monomer consisting of a monomeric acrylic or methacrylic acid ester of a non-tertiary alcohol, said alcohol having from 4 to 12 carbon atoms, and
- (3) a graft polymeric moiety C having a Tg greater than 20.degree. C. selected from the group consisting of poly(alpha-methylstyrene), poly(meth)acrylonitrile, polyvinyltoluene, polystyrene, polyindene, poly(t-butylstyrene), polyethylene, polypropylene, poly(vinyl acetate), poly(lower alkyl)methacrylate, poly(2-oxazoline), poly(meth)acrylamide and poly(N,N-di(lower alkyl)acrylamide);
- and
- wherein the weight ratio of said at least one A monomer to said at least one B monomer ranges from about 1:2 to 2:1, and the average number of carbon atoms present in the alcohol portion of the total acrylic or (meth)acrylic acid esters of monomers A and B present ranges from about 2.5 to 3.5, with the proviso that when the molecular weight of the graft polymeric moiety ranges from 2,000 to 13,000 the graft polymeric moiety is present in an amount of up to about 20% by wt., and when the molecular weight of the graft polymeric moiety is greater than 13,000, then the graft polymeric moiety is present in an amount of up to about 30% by wt.
Dependencies are inferred from the claim text.