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US 8,476,398 B2Granted
Perfluoropolyether urethane additives having (meth)acryl groups and hard coats
Assignee3M Innovative Properties Company
InventorsThomas P. Klun, Naiyong Jing, Richard J. Pokorny, Zai-Ming Qiu, Mark J. Pellerite, William D. Coggio, Christopher B. Walker, Jr.
Life of this patent
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Abstract
Fluorocarbon- and urethane-(meth)acryl-containing additives and hardcoats. The hardcoats are particularly useful as a surface layer on an optical device.
Claims16
A fluorocarbon- and urethane- (meth)acryl-containing composition comprising a perfluoropolyether urethane having a perfluoropolyether moiety and a multi-(meth)acryl terminal group and having the formula:
- n(p(A)QO(O)CHN)—Ri—(NHC(O)XQRf)m;
- wherein
- Ri is the residue of a multi-isocyanate;
- X is O, S or NR, wherein R is H or an alkyl group having 1 to 4 carbon;
- Rf is a monovalent perfluoropolyether moiety comprising groups of the formula F(RfcO)xCdF2d—,
- wherein each Rfc is independently a fluorinated alkylene group having from 1 to 6 carbon atoms,
- each x is an integer greater than or equal to 2, and wherein d is an integer from 1 to 6;
- each Q is independently a connecting group having a valency of at least 2;
- A is a (meth)acryl functional group —XC(O)C(R2)═CH2 wherein R2 is an alkyl group of 1 to 4 carbon atoms or H or F;
- m is at least 1;
- n is at least 1;
- p is 2 to 6;
- m +n is 2 to 10;
- wherein each group having subscripts m and n is attached to the Ri unit.
11 more elements
Dependencies are inferred from the claim text.