Crosslinked pressure sensitive adhesive compositions
AssigneeNational Starch and Chemical Corporation
InventorsMartin M. Skoultchi, Irwin J. Davis
Life of this patent
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Abstract
Improved pressure sensitive adhesive compositions based on acrylate ester polymers and the substrates coated therewith. The improved adhesive and cohesive properties result from the addition to the polymer of specified quinone ultraviolet sensitizers and the subsequent crosslinking thereof by exposure to an ultraviolet source.
Claims14
A pressure sensitive adhesive composition comprising a blend of:
- 1. a pressure sensitive adhesive polymer selected from the class consisting of:
- i. homopolymers of alkyl esters of acrylic and methacrylic acids and
- ii. copolymers of at least one alkyl ester of acrylic and methacrylic acid present in an amount of at least 35% by weight of the copolymer together with at least one other polymerizable comonomer;
- and
- 2.
A process for improving the adhesive and cohesive properties of pressure sensitive adhesive compositions based on pressure sensitive adhesive polymers containing moieties therein derived from alkyl esters of acrylic and methacrylic acid, said process comprising the steps of:
- A. blending (1) a pressure sensitive adhesive polymer selected from the class consisting of:
- i. homopolymers of alkyl esters of acrylic and methacrylic acids and
- ii. copolymers of at least one alkyl ester of acrylic and methacrylic acid present in an amount of at least 35% by weight of the copolymer together with at least one other copolymerizable comonomer;
- with (2) from about 0.1-10%, as based on the weight of polymer solids of a quinone compound corresponding to the formulae:
- ##STR3## wherein R is selected from the group consisting of hydrogen, halogen, alkyl radicals, aryl radicals, and alkoxy radicals;
- and
- B. exposing said pressure sensitive adhesive blend to radiation having a wavelength of from about 2000 to 4000 A for a period of time sufficient to effect crosslinking thereof.
Dependencies are inferred from the claim text.