Claims
- 1. An aqueous composition suitable for use when dry as a pressure sensitive adhesive comprising an aqueous emulsion polymer formed by the free radical polymerization of at least one ethylenically unsaturated monomer selected from the group consisting of (meth)acrylic ester monomers, vinyl esters, vinyl chloride, vinylidene chloride, N-vinyl pyrollidone, and (meth)acrylamides, from 0% to 10%, by weight based on total monomer weight, of a monoethylenically-unsaturated carboxylic acid monomer, and from 0% to 1%, by weight based on monomer weight, multi-ethylenically unsaturated monomer selected from the group consisting of allyl methacrylate, diallyl phthalate, 1,4-butylene glycol dimethacrylate, 1,2-ethylene glycol dimethacrylate, and 1,6-hexanediol diacrylate at a reaction temperature lower than 100° C. in the presence of 20-1500 ppm, based on the total weight of said monomer, of an N-oxyl radical, said polymer having a glass transition temperature (Tg) from −80° C. to 0° C.
- 2. The aqueous composition of claim 1 wherein the level of N-oxyl radical is 250-1000 ppm, based on the total weight of said monomer.
- 3. A method for preparing an aqueous emulsion polymer suitable for use in an aqueous pressure sensitive adhesive composition comprising:forming said aqueous emulsion polymer by the free radical polymerization of at least one ethylenically unsaturated monomer selected from the group consisting of (meth)acrylic ester monomers, vinyl esters, vinyl chloride, vinylidene chloride, N-vinyl pyrollidone, and (meth)acrylamides, from 0% to 10%, by weight based on total monomer weight, of a monoethylenically-unsaturated carboxylic acid monomer, and from 0% to 1%, by weight based on monomer weight, multi-ethylenically unsaturated monomer selected from the group consisting of allyl methacrylate, diallyl phthalate, 1,4-butylene glycol dimethacrylate, 1,2-ethylene glycol dimethacrylate, and 1,6-hexanediol diacrylate at a reaction temperature lower than 100° C. in the presence of 20-1500 ppm, based on the total weight of said monomer, of an N-oxyl radical, said polymer having a glass transition temperature (Tg) from −80° C. to 0° C.
- 4. The method of claim 3 wherein the level of N-oxyl radical is 250-1000 ppm, based on the total weight of said monomer.
Parent Case Info
This patent application claims benefit of Provisional Application No. 60/150,247 filed Aug. 23, 1999.
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|
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Date |
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|
60/150247 |
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