The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 20, 1999
Filed:
Mar. 31, 1997
Ivan S Lee, Arcadia, CA (US);
Avery Dennison Corporation, Pasadena, CA (US);
Abstract
Inherently tacky polymerized copolymer particles are formed by emulsion polymerization for use as an PSA for marking films. The adhesives are the reaction product formed by emulsion polymerization of a first monomer mixture comprising at least one alkyl acrylate containing from 4 to about 12 carbon atoms in the alkyl group, at least one hard monomer, and at least one unsaturated carboxylic acid containing from 3 to about 5 carbon atoms and present in a total amount of from about 3 to about 6% by weight of the first monomers which there is added by the reaction product of a second monomer system comprising at least one alkyl acrylate containing from 4 to about 12 carbon atoms in at least one unsaturated carboxylic acid monomer present containing from 3 to about 5 carbon atoms in present in a total amount from about 7 to about 10% by weight of the monomers, said second copolymer being substantially free of other hard monomers in which said first copolymer is present in an amount at least 50% by weight of the total copolymers and has a glass transition temperature from 0 to about -25.degree. C. The second copolymer has a glass transition temperature of from about -25.degree. C. The copolymers are preferentially formed by sequential polymerization.