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US 5,179,151 AGranted
Internal resin-tackified acrylic polymers containing crosslinkable comonomers
AssigneeExxon Chemical Patents Inc.
InventorHenry W. Yang
Life of this patent
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Abstract
Acrylic copolymer compositions which contain a tackifying hydrocarbon resin and a polyfunctional crosslinking monomer and the use of such composition in pressure-sensitive adhesives are described. The tackifying hydrocarbon resin is dissolved, as is the polyfunctional monomer, in a solution of alkyl(meth)acrylate and (meth) acrylic acid monomers and is present during the polymerization of the monomers to form a tackified acrylic copolymer.
Claims7
A method for preparing a tackified acrylic copolymer composition having increased peel strength while resisting loss of holding properties which comprises the steps of:
- (a) dissolving from about 10 to about 100 parts of a hydrogenated hydrocarbon resin, or a naturally occurring resin, per 100 parts in a liquid mixture of free-radical polymerizable monomers to form a polymerizable vinyl monomer reactant solution, the hydrocarbon resin, or the naturally occurring resin, having a molecular weight of from about 500 to about 5000 and an aromatic content of at least 10% by weight;
- (b) emulsifying the reactant solution in an aqueous medium;
- (c) polymerizing the emulsified monomers, in the absence of oxygen, in the presence of the resin, a free-radical polymerization initiator and small, but effective, amount of polymerizable crosslinking monomer to form an acrylic copolymer latex;
- and
- (d) recovering the tackified acrylic copolymer latex.
2 more elements
Dependencies are inferred from the claim text.