EP0195936A1
Expired / Lapsed
EP
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Method for producing organosilicon polymers and the polymers prepared thereby
Assignee: DuPont Toray Specialty Materials KK
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Filing: 1986-02-21
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Granted: —
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Expires: 2006-02-21
Abstract
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° to 90°C is a highly reproducible method for producing a three-dimensional structure of monofunctional siloxane units and tetrafunctional siloxane units. The organo-silicon polymers produced are useful as tack agents, coating agents, and as additives in other compositions.
Inventors
- 👤 Akihiko Shirahata
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 07:54
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/02; C08G77/04; C08G77/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
135 words
A method for producing organosilicon polymer having a general average formula in which each F 1 , p2 , and R 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 or 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 an organosilane of the formula and mixtures thereof in which R 1 , R 2 , and R 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° to 90°C with stirring.
Claim 2
Independent Claim
135 words
A method for producing organosilicon polymer having a general average formula in which each F 1 , p2 , and R 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 or 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 an organosilane of the formula and mixtures thereof in which R 1 , R 2 , and R 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° to 90°C with stirring.
Claim 3
Dependent Claim
14 words
The method in accordance to claim 1 further comprising removing the low boiling components.
Claim 4
Dependent Claim
20 words
The method in accordance to claim 2 in which the low boiling components are removed by heating at reduced pressure.
Claim 5
Dependent Claim
21 words
The method in accordance to claim 1 in which the aqueous hydrochloric acid contains at least 10 weight percent hydrogen chloride.
Claim 6
Dependent Claim
15 words
The method in accordance to claim 1 in which the organosilicon compound is a disiloxane.
Claim 7
Dependent Claim
77 words
The method in accordance to claim 5 in which the disiloxane is hexamethyldisiloxane, the aqueous hydrochloric acid is concentrated hydrochloric acid, the alkyl silicate is selected from the group consisting of ethyl polysilicate and tetraethoxysilane, the organic solvent is selected from the group consisting of ethanol and a mixture of ethanol and toluene, the mixture is heated to 50° to 90°C before the tetraethoxysilane is dripped into it, and the ratio of is from 1/1 to 1.6/1.
Claim 8
Dependent Claim
20 words
The method in accordance to claim 6 in which the alkyl silicate is tetraethoxysilane and the organic solvent is ethanol.
Claim 9
Dependent Claim
9 words
The composition obtained from the method of claim 1.
References Cited (Backward Citations)
GB290717A
Cited
DE854264C
Cited
FR930065A
Cited
US2857356A
Cited
GB948135A
Cited
GB1044274A
Cited
GB1125170A
Cited
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