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US 7,803,894 B2Granted
Coating compositions with perfluoropolyetherisocyanate derived silane and alkoxysilanes
Assignee3M Innovatie Properties Company
InventorsRudolf J. Dams, Steven J. Martin
Life of this patent
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Abstract
Described are coating compositions for treating substrates such as hard and soft surfaces to render the surfaces oil and water repellent, as well as stain and dirt resistant. The compositions described include three component systems in an organic solvent, where the components include a hydrolyzable perfluoropolyetherisocyanate derived silane, and to non-fluorinated components such as alkoxy silanes, one optionally containing a reactive functional group.
Claims18
A composition comprising a mixture of:
- (a) a hydrolyzable perfluoropolyether urethane or urea silane or a mixture thereof comprising the reaction product of:
- (i) a fluorinated polyether compound of the formula
- (T′)y-Rf-T (I)
- wherein Rf is a monovalent or divalent polyfluoropolyether group;
- T and T′ each independently represents —CO2R3, where R3 is hydroxyalkyl, or —C(O)N(R1)(R2), where R1 is hydroxyalkyl, dihydroxypropyl, or polyalkylenepolyamine and R2 is hydrogen or R1;
- and y is 0 or 1;
- and
- (ii) a silane compound of the formula
- T″-Q″-SiY3-xRx (II)
- wherein T″ is —NCO;
- Q″ is —(CnH2n)—, where n is 2 to 6;
- R is an alkyl group of 1-4 carbon atoms;
- Y is a hydrolyzable group;
- and x is 0, 1 or 2;
- (b) at least one non-fluorinated compound of the formula:
- (R′)qSi(Y′)p
- wherein R′ is a C1-C4 alkyl group;
- p is 2, 3 or 4;
- q is 0, 1 or 2, wherein the sum of p+q is 4, and Y′ is a C1-C4 alkoxy group;
- and
- (c) optionally, at least one non-fluorinated compound of the formula:
- R″Si(Y″)3
- wherein R″ is a C6-C20 alkyl group and Y″ is a C1-C4 alkoxy group, or a compound of the formula:
- L-Q″-Si(Y″)3,
- wherein L is a reactive functional group selected from an amino, an epoxy, a mercaptan, a methacrylate and an anhydride group;
- Q″ is —(CnH2n)—, where n is 2 to 6;
- Y″ is a C1-C4 alkoxy group.
24 more elements
Dependencies are inferred from the claim text.