US5109093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing organosilicon products
Assignee: Dow Silicones UK Ltd
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Filing: 1990-01-31
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Granted: 1992-04-28
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Expires: 2010-01-31
Abstract
Abstract A process for the preparation of an organosilicon condensation product which comprises reacting together at a temperature of at least 50° C. (A) an organosilicon compound having in the molecule at least one silicon-bonded hydroxyl group; and (B) an organosilicon compound having in the molecule at least one silicon-bonded --OX group, in which X respresents an alkyl group having from 1 to 8 carbon atoms or an alkoxyalkyl group having from 2 to 8 carbon atoms, in the presence of a catalytic substance which is selected from strontium hydroxide and barium hydroxide.
Inventors
- 👤 Sian B. Rees
- 👤 Stephen Westall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:03
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/18; C08G77/06; C08G77/08; C08G77/20; C08G77/22
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
184 words
A process for the preparation of an organosilicon condensation product which comprises reacting together at a temperature of t least 50° C. (A) an organosilicon compound having in the molecule at least one silicon-bonded hydroxyl group and wherein the organo substituents are selected from the group consisting of monovalent hydrocarbon groups having from 1 to 18 carbon atoms and monovalent substituted hydrocarbon groups having from 1 to 10 carbon atoms said substituted hydrocarbon groups being non-acidic in character, and (B) an organosilicon compound having in the molecule at least one --OX group wherein X represents and alkyl group having from 1 to 8 carbon atoms, or an alkoxyalkyl group having from 2 to 8 carbon atoms, any remaining silicon-bonded substituents in the organosilicon compound being selected from the group consisting of monovalent hydrocarbon groups having from 1 to 18 carbon atoms and monovalent substituented hydrocarbon groups having from 1 to 10 carbon atoms, said substituted hydrocarbon groups being non-acidic in character, in the presence of a catalyst substance (C) which is selected from the group consisting of strontium hydroxide, barium hydroxide and mixtures thereof.
Claim 2
Dependent Claim
184 words
A process for the preparation of an organosilicon condensation product which comprises reacting together at a temperature of t least 50° C. (A) an organosilicon compound having in the molecule at least one silicon-bonded hydroxyl group and wherein the organo substituents are selected from the group consisting of monovalent hydrocarbon groups having from 1 to 18 carbon atoms and monovalent substituted hydrocarbon groups having from 1 to 10 carbon atoms said substituted hydrocarbon groups being non-acidic in character, and (B) an organosilicon compound having in the molecule at least one --OX group wherein X represents and alkyl group having from 1 to 8 carbon atoms, or an alkoxyalkyl group having from 2 to 8 carbon atoms, any remaining silicon-bonded substituents in the organosilicon compound being selected from the group consisting of monovalent hydrocarbon groups having from 1 to 18 carbon atoms and monovalent substituented hydrocarbon groups having from 1 to 10 carbon atoms, said substituted hydrocarbon groups being non-acidic in character, in the presence of a catalyst substance (C) which is selected from the group consisting of strontium hydroxide, barium hydroxide and mixtures thereof.
Claim 3
Dependent Claim
25 words
A process as claimed in claim 1 wherein (A) and (B) are reacted at a temperature in the range from 60° C. to 180° C.
Claim 4
Dependent Claim
15 words
A process as claimed in claim 1 wherein organosilicon compound (A) is a silanol-terminated polydiorganosiloxane.
Claim 5
Dependent Claim
81 words
A process as claimed in claim 1 wherein (B) is a compound falling within the general formula G y Si(OX) 4-y wherein y has a value of 1, 2 or 3, G represents a monovalent hydrocarbon group having from 1 to 10 carbon atoms or a monovalent substituted hydrocarbon group having from 1 to 10 carbon atoms and X represents an alkyl group having from 1 to 8 carbon atoms or an alkoxyalkyl group having from 2 to 8 carbon atoms.
Claim 6
Dependent Claim
20 words
A process as claimed in claim 4 wherein X represents an alkyl group having from 1 to 3 carbon atoms.
Claim 7
Dependent Claim
23 words
A process as claimed in claim 1 which comprises passing a mixture of (A) and (B) over or through a bed containing (C).
Claim 8
Dependent Claim
11 words
A process as claimed in claim 1 wherein (C) is present
Claim 9
Dependent Claim
33 words
A process as claimed in claim 1 which also comprises contacting the condensation product with a second catalyst which is effective in catalysing a reaction between residual silanol groups in said condensation product.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-04-28 | 1995-10-28 | 1996-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-28 | 1999-10-28 | 2000-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-28 | 2003-10-28 | 2004-04-28 | $7700.00 | Window Closed / Lapsed |