EP0382365A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process for producing organosilicon products
Assignee: Dow Silicones UK Ltd
•
Filing: 1990-01-22
•
Granted: —
•
Expires: 2010-01-22
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 represents 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 Beverley Rees
- 👤 Stephen Westall
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 18:04
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
167 words
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 wherein the organic substituents are selected from 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 an 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 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, in the presence of a catalyst substance (C) which is strontium hydroxide and/or barium hydroxide.
Claim 2
Dependent Claim
167 words
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 wherein the organic substituents are selected from 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 an 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 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, in the presence of a catalyst substance (C) which is strontium hydroxide and/or barium hydroxide.
Claim 3
Dependent Claim
23 words
A process as claimed in Claim 1 wherein (A) and (B) are reacted at a temperture in the range from 60°C to 180°C.
Claim 4
Dependent Claim
18 words
A process as claimed in Claim 1 or Claim 2 wherein organosilicon compound (A) is a silanol-terminated polydiorganosiloxane.
Claim 5
Dependent Claim
85 words
A process as claimed in any one of the preceding claims 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 18 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
24 words
A process as claimed in any one of the preceding claims wherein X represents an alkyl group having from 1 to 3 carbon atoms.
Claim 7
Dependent Claim
27 words
A process as claimed in any one of the preceding claims which comprises passing a mixture of (A) and (B) over or through a bed containing (C).
Claim 8
Dependent Claim
29 words
A process as claimed in any one of the preceding claims wherein (C) is present dispersed in or on a particulate solid which is inert under the reaction conditions.
Claim 9
Dependent Claim
44 words
A process as claimed in any one of the preceding claims which also comprises contacting the condensation product with a second catalyst which is effective in catalysing the reaction of at least some of the residual silanol groups in said product with each other.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.