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Patent US5079324A successfully refreshed from Google Patents.
US5079324A
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Lioh catalyzed preparation of alkoxylated diorganopolysiloxanes
Assignee: Elkem Silicones France SAS
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Filing: 1989-11-06
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Granted: 1992-01-07
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Expires: 2009-11-06
Abstract
Abstract Functionalized diorganopolysiloxanes containing alkoxy endgroups, well adapted for the formulation of single-component cold-vulcanizable elastomer compositions therefrom, are prepared by reacting an α, ω-dihydroxydiorganopolysiloxane oil with a polyalkoxysilane in the presence of a catalytically effective amount of lithium hydroxide.
Inventors
- 👤 Roger Cocco
- 👤 Michel Letoffe
- 👤 Georges Nielsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:12
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06; C08G77/08; C08G77/14; C08G77/18; C08G77/32; Y; Y10; Y10S; Y10S528/00; Y10S528/901
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
184 words
A process for the preparation of a linear diorganopolysiloxane containing at least one alkoxy group bonded to a silicon atom at each polymer chain end, comprising reacting, in a functionalization reaction, at least one linear diorganopolysiloxane containing a hydroxyl group bonded to a silicon atom at each polymer chain end with at least one polyalkoxysilane of the formula: (R.sup.4).sub.c (R.sup.1).sub.a Si(OR.sup.2).sub.4-(a+c) ( 3) in the presence of a catalytically effective amount of lithium hydroxide, and wherein such polyalkoxysilane of formula (3), a is 0, 1, 1, or 2; c is 0, 1, or 2; a+c is 0, 1 or 2; R 1 is an aliphatic, cycloaliphatic or aromatic, substituted or unsubstituted, C 1 -C 13 monovalent hydrocarbon radical; the radicals R 2 , which may be identical or different, are each an aliphatic radical having from 1 to 8 carbon atoms or an aralkyl radical having from 7 to 13 carbon atoms; and R 4 is an aliphatic, cycloaliphatic or aromatic, substituted or unsubstituted C 1 -C 13 monovalent hydrocarbon radical, with the proviso that R 4 may be identical to R 1 .
Claim 2
Dependent Claim
184 words
A process for the preparation of a linear diorganopolysiloxane containing at least one alkoxy group bonded to a silicon atom at each polymer chain end, comprising reacting, in a functionalization reaction, at least one linear diorganopolysiloxane containing a hydroxyl group bonded to a silicon atom at each polymer chain end with at least one polyalkoxysilane of the formula: (R.sup.4).sub.c (R.sup.1).sub.a Si(OR.sup.2).sub.4-(a+c) ( 3) in the presence of a catalytically effective amount of lithium hydroxide, and wherein such polyalkoxysilane of formula (3), a is 0, 1, 1, or 2; c is 0, 1, or 2; a+c is 0, 1 or 2; R 1 is an aliphatic, cycloaliphatic or aromatic, substituted or unsubstituted, C 1 -C 13 monovalent hydrocarbon radical; the radicals R 2 , which may be identical or different, are each an aliphatic radical having from 1 to 8 carbon atoms or an aralkyl radical having from 7 to 13 carbon atoms; and R 4 is an aliphatic, cycloaliphatic or aromatic, substituted or unsubstituted C 1 -C 13 monovalent hydrocarbon radical, with the proviso that R 4 may be identical to R 1 .
Claim 3
Dependent Claim
105 words
The process as defined by claim 1, said at least one linear diorganopolysiloxane containing at least one alkoxy group at each polymer chain end having the formula: ##STR14## and said at least one linear diorganopolysiloxane containing a hydroxyl group at each polymer chain end having the formula: ##STR15## wherein the radicals R, which may be identical or different, are each a monovalent hydrocarbon radical having from 1 to 10 carbon atoms, or halogen or cyano substituted such radicals; and n is a number such as to impart a viscosity of 25 to 1,000 mPa.s at 25° C. to the diorganopolysiloxanes of formulae (1) and (2).
Claim 4
Dependent Claim
23 words
The process as defined by claim 2, wherein formulae (1) and (2), each radical R is a methyl, phenyl, vinyl or trifluoropropyl radical.
Claim 5
Dependent Claim
22 words
The process as defined by claim 1, said at least one polyalkoxysilane of formula (3) comprising methyltrimethoxysilane, vinyltrimethoxysilane, tetraethoxysilane, vinyltriethoxysilane or methylvinyldimethoxysilane.
Claim 6
Dependent Claim
15 words
The process as defined by claim 1, said lithium hydroxide comprising an alcoholic solution thereof.
Claim 7
Dependent Claim
14 words
The process as defined by claim 1, carried out in less than 10 minutes.
Claim 8
Dependent Claim
12 words
The process as defined by claim 1, carried out at ambient temperature.
Claim 9
Dependent Claim
41 words
The process as defined by claim 2, further comprising neutralizing said lithium hydroxide catalyst upon completion of the functionalization reaction between the diorganopolysiloxane containing a hydroxyl group at each polymer chain end of formula (2) and the diorganopolysiloxane of formula (3).
Claim 10
Dependent Claim
16 words
The process as defined by claim 8, comprising neutralizing said lithium hydroxide with a silyl phosphate.
Claim 11
Dependent Claim
15 words
The process as defined by claim 1, said lithium hydroxide catalyst comprising LiOH·H 2 O.
Claim 12
Dependent Claim
22 words
The process as defined by claim 1 wherein R 1 comprises an epoxy, primary, secondary or tertiary amine or mercapto functional group.
Claim 13
Dependent Claim
13 words
The process according to claim 1 wherein R 1 is saturated or unsaturated.
Claim 14
Dependent Claim
13 words
The process according to claim 1 wherein R 4 in saturated or unsaturated.
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) | 1995-01-06 | 1995-07-08 | 1996-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-06 | 1999-07-08 | 2000-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-06 | 2003-07-08 | 2004-01-07 | $7700.00 | Window Closed / Lapsed |