| 摘要 |
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 DEG C. The second copolymer has a glass transition temperature of from about -25 DEG C. The copolymers are preferentially formed by sequential polymerization.
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