Acrylic emulsion pressure sensitive adhesive composition 

United States Patent（美国专利号）： 8252425

Abstract：An improved aqueous acrylic emulsion pressure sensitive adhesive composition (PSA) of diminished defoaming instability, consisting of i) an aqueous acrylic emulsion consisting of at least one C.sub.4-C.sub.18 alkyl (meth)acrylate monomer, at least one monomer having a residual carboxyl group, up to about 25% by weight styrene, and optionally an acrylamide or acrylamide derivative, and (ii) a sodium alkyl aryl polyethoxy sulfonate surfactant, said residual carboxyl group being neutralized with an alkanol amine selected from the group consisting of trimethanolamine, diethanolamine, triethanolamine, tripropanolamine and trifluoroethanolamine.

Background:all emulsion polymers foam due to their surfactant content. Without the addition of defoaming/antifoaming agents, emulsion polymers would be difficult at best to process into useful form, such as, for example, forming a film on a substrate. Unfortunately, most defoamers lose their efficacy over time. Adding additional defoamer to the emulsion prior to application may be of limited value due to numerous side effects encountered. Furthermore, coating of the emulsion often requires high shear, which may be compromised by the late addition of additional defoamer.

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