Waterborne silicone adhesives, sealants and coatings
AssigneeCK Witco Corporation
InventorsMisty Weiyu Huang, Bruce A. Waldman, Jeff A. Cooke
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Abstract
Novel hindered alkoxy siloxane compounds and compositions containing hindered alkoxy siloxane compounds are provided. The compositions include a polymer/crosslinking system which is composed of a self crosslinking resin comprised of a silicone fluid modified with pendant or terminal silanes containing hindered alkoxy groups, or a silanol fluid and a crosslinking compound, of a mixture thereof. These components are first emulsified and then formulated into a latex sealant by blending with a separate emulsion of an appropriate catalyst. Crosslinking occurs upon drying of the emulsion.
Claims18
A storage stable aqueous silicone emulsion composition that cures upon drying comprising a blend of:
- a) one or more emulsions that collectively comprise a reactive polymer/crosslinker system comprising a compound having thereon a group of formula I:
- —SiR2a(OR3)b I
- wherein R2 is alkyl, alkoxy-substituted alkyl, aryl or aralkyl, and has 1 to 12 carbon atoms;
- R3 is alkyl, alkoxy-substituted alkyl, aryl, or aralkyl, and has 2 to 10 carbon atoms;
- a is 0 or 1;
- b is 2 or 3;
- a+b is 3;
- the reactive polymer/crosslinker system comprising:
- (i) at least one condensable polyorganosiloxane polymer of formula IV:
- where R is independently R2, OR3, or R5;
- R5 is a group of formula II:
- R1—SiR2a(OR3)b II
- where R1 is a divalent organic group, w is 2+y+2z;
- y is 0 to 2;
- z is 0 to 2;
- y+z is 0 to 2;
- w +x+y+z is 2 to 30;
- and there are an average of at least two R5 groups per molecule;
- and
- (ii) at least one crosslinking compound, which may be the same as or different from the at least one condensable polyorganosiloxane polymer of formula IV, the crosslinking compound having a plurality of hindered alkoxy groups of the formula —OR3 thereon, where R3 is an alkyl or alkoxy-substituted alkyl, aryl or aralkyl group and has from 2 to 10 carbon atoms;
- and
- b) a separate aqueous emulsion comprising a silicone condensation catalyst.
A method for providing a crosslinked silicone on a substrate comprising applying to said substrate a composition comprising a blend of:
- a) one or more emulsions that collectively comprise a reactive polymer/crosslinker system comprising a compound having thereon a group of formula I:
- —SiR2a(OR3)b I
- wherein R2 is alkyl, alkoxy-substituted alkyl, aryl or aralkyl and has 1 to 12 carbon atoms;
- R3 is alkyl, alkoxy-substituted alkyl, aryl, or aralkyl, and has 2 to 10 carbon atoms;
- a is 0 or 1;
- b is 2 or 3;
- a+b is 3;
- the reactive polymer/crosslinker system comprising:
- (i) at least one condensable polyorganosiloxane polymer of formula IV:
- where R is independently R2, OR3, or R5 is a group of formula II:
- R1—SiR2a(OR3)b II
- where R1 is a divalent organic group, w is 2+y+2z;
- y is 0 to 2;
- z is 0 to 2;
- y+z is 0 to 2;
- w+x+y+z is 2 to 30;
- and there is an average of at least two R5 groups per molecule;
- and
- (ii) at least one crosslinking compound, which may be the same as or different from the at least one condensable polyorganosiloxane polymer of formula IV, the crosslinking compound having a plurality of hindered alkoxy groups of the formula —OR3 thereon, where R3 is an alkyl or alkoxy-substituted alkyl, aryl or aralkyl group and has from 2 to 10 carbon atoms;
- and
- b) a separate aqueous emulsion comprising a silicone condensation catalyst.
Dependencies are inferred from the claim text.