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US 7,927,703 B2Granted
Adhesive blends, articles, and methods
Assignee3M Innovative Properties Company
InventorsJianhui Xia, Ying-Yuh Lu, Zhiming Zhou
Life of this patent
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Abstract
Described are adhesive compositions containing a mixture of a pressure sensitive adhesive, a high Tg polymer, and a crosslinker to form a compatibilized blend that is optically clear. Methods of using the adhesive compositions, and multilayer assemblies such as optical elements prepared using the adhesives, are also provided.
Claims18
An adhesive composition comprising a blend of:
- a majority of a pressure sensitive adhesive component comprising at least one polymer with an acid functionality, wherein the pressure sensitive adhesive is formed from alkyl (meth)acrylate monomers having an alkyl group comprising from 4 to 12 carbon atoms,
- a high Tg polymer with a glass transition temperature greater than 20° C. and a weight average molecular weight greater than 100,000 wherein the high Tg polymer is a basic copolymer, and wherein the high Tg polymer comprises a copolymer formed from methyl methacrylate, butyl methacrylate, and dimethylamino ethylmethacrylate;
- and
- a crosslinker;
- wherein the functionality of the pressure sensitive adhesive component and the functionality of the high Tg polymer form an acid-base interaction when mixed, and after aging at 80° C. and 90% relative humidity for 500 hours, the composition is optically clear on visual observation so that the composition exhibits a luminous transmission of at least about 90% and a haze of less than about 2% when measured according to ASTM-D 1003-95.
2 more elements
Dependencies are inferred from the claim text.