Claims
- 1. A stable reactive aqueous dispersion of a functional graft polyorganosiloxane, said functional graft polyorganosiloxane comprising the polymerizate of at least one ethylenically unsaturated monomer with a functional polyorganosiloxane which comprises identical or different recurring structural units of formula (I):
- R.sub.a Y.sub.b X.sub.c SiO.sub.(4-a-b-c)/2 (I)
- in which the radicals R, which may be identical or different, are each a C.sub.1 -C.sub.18 alkyl radical, a C.sub.2 -C.sub.20 alkenyl radical, or a C.sub.6 -C.sub.12 aryl or aralkyl radical, or halogen-substituted such radical; the radicals X, which may be identical or different, are each a hydrogen atom or a reactive functional group bonded to a silicon atom via an Si-C or Si-O-C linkage; the radicals Y, which may be identical or different, are each an ethylenically unsaturated hydrocarbon radical optionally comprising one or more of the heteroelements O and/or N, and bonded to a silicon atom of the structural unit of formula (I) via an Si-C linkage and reactive with said at least one ethylenically unsaturated monomer; a, b and c are each equal to 0, 1, 2 or 3; and a+b+c=0, 1, 2 or 3; with the proviso that the number of SiO.sub.4/2 units is less than 30 mol % and the number of structural units of formula (I) in which the silicon atom is substituted by a functional group X and/or a radical Y is such that the polyorganosiloxane comprises (i) at least 5 milliequivalents of X functional groups per 100 grams of polyorganosiloxane of formula (I) and (ii) at least 5 milliequivalents of Y radicals per 100 grams of polyorganosiloxane of formula (I); wherein said stable reactive aqueous dispersion will form, with a reactant, a curable silicone composition.
- 2. The stable reactive aqueous dispersion as defined by claim 1, said at least one ethylenically unsaturated monomer comprising a monoethylenically unsaturated ester of a saturated carboxylic acid, a saturated ester or amide of a monoethylenically unsaturated carboxylic acid, a monoethylenically unsaturated nitrile, a monoethylenically unsaturated carboxylic acid, a hydroxyalkyl or aminoalkyl ester of a monoethylenically unsaturated carboxylic acid, a vinylaromatic compound, or dicyclopentadienyl acrylate or methacrylate.
- 3. The stable reactive aqueous dispersion as defined by claim 1, said functional groups X being chemically reactive via addition, polyaddition, condensation, polycondensation, or dehydropolycondensation.
- 4. The stable reactive aqueous dispersion as defined by claim 3, said reactive functional groups X comprising a hydrofunctional group, alkenyl or cycloalkenyl radical, hydroxyfunctional group, epoxyfunctional group, alkoxyfunctional group, aryloxyfunctional group, acyloxyfunctional group, or alkenylcarbonyloxyfunctional group.
- 5. The stable reactive aqueous dispersion as defined by claim 1, said radicals Y having the formula -y-Y', in which y is a C.sub.1 -C.sub.18 linear or branched alkylene radical optionally extended via a divalent ethylenediamine, polyethyleneamine, oxyalkylene or polyoxyalkylene radical, optionally substituted by a hydroxyl or hydroxycyclohexylene radical, and Y' is an alkenylcarbonyloxy radical.
- 6. The stable reactive aqueous dispersion as defined by claim 1, at least 80 mol % of said radicals R being methyl radicals.
- 7. The stable reactive aqueous dispersion as defined by claim 5, said radicals y comprising a --CH.sub.2 --, --(CH.sub.2).sub.2, --(CH.sub.2).sub.3, --CH.sub.2 --CH(CH.sub.3) --CH.sub.2 --, --(CH.sub.2).sub.3 --NH--CH.sub.2 --CH.sub.2 --, --(CH.sub.2).sub.3 --OCH.sub.2 --, --(CH.sub.2).sub.3 --(OCH.sub.2 --CH.sub.2).sub.29 --, --(CH.sub.2).sub.3 --[O--CH.sub.2 --CH(CH.sub.3).brket close-st., --(CH.sub.2).sub.3 --OCH.sub.2 CH(OH)CH.sub.2 --, or --(CH.sub.2).sub.2 --C.sub.6 H.sub.9 (OH)-- radical.
- 8. The stable reactive aqueous dispersion as defined by claim 1, comprising a linear polymerizate.
- 9. The stable reactive aqueous dispersion as defined by claim 1, comprising an up to 50% by weight branched polymerizate.
- 10. The stable reactive aqueous dispersion as defined by claim 1, comprising a cyclic polymerizate.
- 11. The stable reactive aqueous dispersion as defined by claim 1, comprising a three-dimensional polymerizate.
- 12. The stable reactive aqueous dispersion as defined by claim 1, comprising (i) from 10 to 500 milliequivalents of X functional groups and (ii) from 10 to 500 milliequivalents of Y radicals per 100 grams thereof.
- 13. The stable reactive aqueous dispersion as defined by claim 1, having a solids content ranging from about 5% to 60% by weight.
- 14. The stable reactive aqueous dispersion as defined by claim 13, having a solids content ranging from about 25% to 50% by weight.
- 15. A curable silicone composition comprising the stable reactive aqueous dispersion as defined by claim 1.
- 16. The silicone composition as defined by claim 15, in crosslinked state.
- 17. The curable silicone composition as defined by claim 15, comprising from 10% to 80% by weight of said stable reactive aqueous dispersion and from 90% to 20% by weight of an aqueous emulsion of a polyorganosiloxane reactive with the X functional groups of said functional graft polyorganosiloxane.
- 18. A release coating comprising the silicone composition as defined by claim 16.
- 19. A paint comprising the silicone composition as defined by claim 16.
- 20. A process for the preparation of a stable reactive aqueous dispersion as defined by claim 1, comprising radically polymerizing said at least one ethylenically unsaturated monomer, in aqueous emulsion or in microsuspension, in the presence of said functional graft polyorganosiloxane (I).
- 21. The process as defined by claim 20, carried out in the presence of an emulsifying agent and a radical polymerization initiator.
- 22. The process as defined by claim 21, comprising homogenizing a mixture of said at least one ethylenically unsaturated monomer and said functional graft polyorganosiloxane in a water/emulsifier admixture, and then polymerizing same in the presence of a water-soluble or water-dispersible polymerization initiator, at a temperature a least equal to the decomposition temperature of said initiator.
- 23. The process as defined by claim 21, comprising introducing a mixture of said at least one ethylenically unsaturated monomer and said polymerization initiator into an aqueous emulsion of said functional graft polyorganosiloxane, and then polymerizing same at a temperature at least equal to the decomposition temperature of the initiator.
- 24. The process as defined by claim 21, comprising preemulsifying a mixture of said at least one ethylenically unsaturated monomer, said functional graft polyorganosiloxane and said polymerization initiator in a water/emulsifier admixture, and then polymerizing same at a temperature at least equal to the decomposition temperature of the initiator.
Priority Claims (1)
Number |
Date |
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Kind |
93 09095 |
Jul 1993 |
FRX |
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Parent Case Info
This application is a continuation of application Ser. No. 08/280,344, filed Jul. 25, 1994, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3575910 |
Thomas |
Apr 1971 |
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5283296 |
Canivenc et al. |
Feb 1994 |
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Foreign Referenced Citations (3)
Number |
Date |
Country |
0541395 |
May 1993 |
EPX |
1149935 |
Apr 1969 |
GBX |
9010665 |
Sep 1990 |
WOX |
Continuations (1)
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Number |
Date |
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Parent |
280344 |
Jul 1994 |
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