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US 4,707,531 AGranted
Method for producing organosilicon polymers and the polymers prepared thereby
AssigneeToray Silicone Company, Ltd.
InventorAkihiko Shirahata
Life of this patent
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Abstract
The method of dripping an alkyl silicate into a mixture of an aqueous hydrochloric acid which contains at least 5 weight percent hydrogen chloride and a trialkylsilane or a disiloxane at a temperature of from 0.degree. to 90.degree. C. is a highly reproducible method for producing a three-dimensional structure of monofunctional siloxane units and tetrafunctional siloxane units. The organosilicon polymers produced are useful as tack agents, coating agents, and as additives in other compositions.
Claims27
A method for producing organosilicon polymer having a general average formula
- (R.sup.1 R.sup.2 R.sup.3 SiO.sub.1/2).sub.a (SiO.sub.4/2).sub.b
- in which each R.sup.1, R.sup.2, and R.sup.3 is a hydrogen atom or a monovalent hydrocarbon radical and the ratio of a/b is from 0.2/1 to about 4/1 comprising dripping an alkyl silicate selected from the group consisting of alkyl orthosilicate and its partial hydrolysis condensate into a mixture of aqueous hydrochloric acid containing at least 5 weight percent hydrogen chloride and an organosilicon compound selected from the group consisting of a disiloxane of the formula
- (R.sup.1 R.sup.2 R.sup.3 Si).sub.2 O,
- an organosilane of the formula
- R.sup.1 R.sup.2 R.sup.3 SiX,
- and mixtures thereof in which R.sup.1, R.sup.2, and R.sup.3 are defined above and X is a group selected from the group consisting of a halogen atom, an alkoxy group, and a hydroxyl group at a temperature of from 0.degree. to 90.degree. C. with stirring.
3 more elements
Dependencies are inferred from the claim text.