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US 9,296,933 B2Granted
Urethane-based pressure sensitive adhesives
Assignee3M Innovative Properties Company
InventorsAudrey A. Sherman, Scott M. Tapio, James P. DiZio
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Abstract
Non-silicone, urethane-based adhesives are disclosed which are prepared by the polymerization of reactive oligomers with the general formula X-A-B-A-X, where X is an ethylenically unsaturated group B is a unit free of silicone, and A is a urethane linkage. The adhesives are optically clear, self wetting and removable. Adhesive articles, including optical adhesive articles, may be prepared using the disclosed non-silicone urethane-based adhesives.
Claims7
An adhesive comprising a cured mixture comprising:
- at least one X-A-B-A-X reactive oligomer, wherein
- X comprises an ethylenically unsaturated group,
- B comprises a non-silicone unit with a number average molecular
- weight of 5,000 grams/mole or greater comprising an oxyalkylene group, and
- A comprises a urethane linking group, wherein the adhesive is optically clear, self-wetting and removable.
2 more elements
Dependencies are inferred from the claim text.