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AssigneeAir Products Polymers, L.P.
InventorsBruce Alan Gruber, Frank Vito DiStefano
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The invention is directed to an improvement in a process for preparing an aqueous emulsion of pressure-sensitive adhesive based upon acrylic esters having a good balance of adhesive and cohesive properties and to the resulting emulsion. In the basic process, a pressure-sensitive adhesive formulation comprised of at least one ester of acrylic or methacrylic acid is polymerized in the presence of water and an emulsifier thereby forming an emulsion polymerized pressure-sensitive adhesive. The improvement resides in effecting the polymerization of the pressure-sensitive adhesive formulation comprised of at least one ester of acrylic or methacrylic acid in the presence of from 5 to 30 percent by weight of a styrene containing polymer containing at least 80 percent by weight styrene.
In a method for preparing an aqueous emulsion of a pressure-sensitive adhesive based upon acrylic esters having a good balance of adhesive and cohesive properties wherein a pressure-sensitive adhesive formulation comprised of at least one ester of acrylic or methacrylic acid is polymerized in the presence of water and an emulsifier thereby forming an emulsion polymerized pressure-sensitive adhesive polymer, the improvement which comprises effecting the polymerization of said pressure-sensitive adhesive formulation comprised of at least one ester of acrylic or methacrylic acid in the presence of a styrene containing polymer containing at least 80 percent by weight styrene, said styrene containing polymer incorporated in an amount of from 5 to 30 percent by weight based upon the combined weight of said pressure-sensitive adhesive formulation and said styrene containing polymer.
Dependencies are inferred from the claim text.