Patent US5243183A successfully refreshed from Google Patents.
US4308366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polycondensation of hydroxysilylated polysiloxanes
Assignee: Rhone Poulenc Industries SA
•
Filing: 1980-07-18
•
Granted: 1981-12-29
•
Expires: 2000-07-18
Abstract
Abstract High molecular weight organopolysiloxanes are rapidly prepared, without formation of the low molecular weight polysiloxanes, by polycondensing a hydroxysilylated polysiloxane in the presence of a catalytic amount of a catalyst system including (i) an alkali or alkaline earth metal, and (ii) a polyheteromacropolycyclic co-catalyst having the structural formula: ##STR1## wherein Σ is a divalent radical having the structural formula ##STR2## or a divalent radical having the structural formula: ##STR3## further wherein each R, which may be identical or different, is a divalent hydrocarbon radical, each Q, which also may be identical or different, is a divalent hydrocarbon radical, an oxygen atom or a sulfur atom, and m, n and p are each integers equal to 1, 2 or 3.
Inventors
- 👤 Claude Millet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:07
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06; C08G77/08
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
64 words
A process for the preparation of a high molecular weight organopolysiloxane by polycondensation of a hydroxysilylated polysiloxane, essentially without formation of low molecular weight polysiloxane, which comprises polycondensing such polysiloxane, essentially without equilibration thereof, in the presence of a catalytic amount of a catalyst system comprising (i) an alkali or alkaline earth metal, and (ii) a polyheteromacropolycyclic cryptate co-catalyst having the structural formula: ##STR18##
Claim 2
Dependent Claim
64 words
A process for the preparation of a high molecular weight organopolysiloxane by polycondensation of a hydroxysilylated polysiloxane, essentially without formation of low molecular weight polysiloxane, which comprises polycondensing such polysiloxane, essentially without equilibration thereof, in the presence of a catalytic amount of a catalyst system comprising (i) an alkali or alkaline earth metal, and (ii) a polyheteromacropolycyclic cryptate co-catalyst having the structural formula: ##STR18##
Claim 3
Dependent Claim
70 words
wherein Σ is a divalent radical having the structural formula ##STR19## or a divalent radical having the structural formula: ##STR20## further wherein each R, which may be identical or different, is a divalent hydrocarbon radical, each Q, which also may be identical or different, is a divalent hydrocarbon radical, an oxygen atom or a sulfur atom, and m, n and p are each integers equal to 1, 2 or 3.
Claim 4
Dependent Claim
70 words
wherein Σ is a divalent radical having the structural formula ##STR19## or a divalent radical having the structural formula: ##STR20## further wherein each R, which may be identical or different, is a divalent hydrocarbon radical, each Q, which also may be identical or different, is a divalent hydrocarbon radical, an oxygen atom or a sulfur atom, and m, n and p are each integers equal to 1, 2 or 3.
Claim 5
Dependent Claim
63 words
The process as defined by claim 1, wherein the co-catalyst (ii) is selected from the group consisting of those having the structural formulae: ##STR21## wherein m, n and p are integers from 1 to 3, and each R, which may be identical or different, is ##STR22## with Y being a linear or branched chain alkyl radical having from 1 to 4 carbon atoms.
Claim 6
Dependent Claim
35 words
The process as defined by claim 1, wherein the co-catalyst (ii) is selected from the group consisting of those having the structural formulae: ##STR23## wherein m, n and p are integers from 1 to 3.
Claim 7
Dependent Claim
33 words
The process as defined by any of claims 2, 3 or 1, wherein the alkali or alkaline earth metal (i) is selected from the group consisting of lithium, sodium, potassium, rubidium and cesium.
Claim 8
Dependent Claim
31 words
The process as defined by claim 4, wherein said catalyst system comprises from 0.1 to 1,000 mg equivalents of alkali metal hydroxide or alkaline earth metal hydroxide per kg of hydroxysilylpolysiloxane.
Claim 9
Dependent Claim
32 words
The process as defined by claim 5, wherein said catalyst system comprises a molar ratio co-catalyst (ii)/equivalents of alkali metal hydroxide or alkaline earth metal hydroxide (i) of between 0.005 and 3.
Claim 10
Dependent Claim
112 words
The process as defined by any of claims 2, 3 or 1, said hydroxysilylated polysiloxane comprising substituents directly bonded to the silicon atoms thereof selected from the group consisting of: (a) alkyl radicals or haloalkyl radicals having from 1 to 5 carbon atoms and containing from 1 to 6 chlorine and/or fluorine atoms, (b) cycloalkyl radicals and halocycloalkyl radicals having from 3 to 8 carbon atoms and containing from 1 to 4 chlorine and/or fluorine atoms, (c) aryl radicals, alkylaryl radicals and haloaryl radicals having from 6 to 8 carbon atoms and containing from 1 to 4 chlorine and/or fluorine atoms; and (d) cyanoalkyl radicals having from 3 to 4 carbon atoms.
Claim 11
Dependent Claim
30 words
The process as defined by claim 7, said substituents directly bonded to the silicon atoms being selected from the group consisting of methyl, phenyl, vinyl, halogenated such radicals, and cyanoalkyl.
Claim 12
Dependent Claim
14 words
The process as defined by claim 8, said hydroxysilylated polysiloxane being a linear α,ω-bis-hydroxysilylpolydiorganosiloxane.
Claim 13
Dependent Claim
15 words
The process as defined by claim 8, said hydroxysilylated polysiloxane being a branched chain polysiloxane.
Claim 14
Dependent Claim
14 words
The process as defined by claim 8, said hydroxysilylated polysiloxane being a crosslinked polysiloxane.
Claim 15
Dependent Claim
19 words
The process as defined by any of claims 2, 3 or 1, the same being conducted in solvent medium.
Claim 16
Dependent Claim
15 words
The process as defined by claim 1, said co-catalyst (ii) having the structural formula (II).
Claim 17
Dependent Claim
15 words
The process as defined by claim 1, said co-catalyst (ii) having the structural formula (III).
Claim 18
Dependent Claim
15 words
The process as defined by claim 2, said co-catalyst (ii) having the structural formula (IV).
Claim 19
Dependent Claim
15 words
The process as defined by claim 2, said co-catalyst (ii) having the structural formula (V).
Claim 20
Dependent Claim
15 words
The process as defined by claim 2, said co-catalyst (ii) having the structural formula (VI).
Claim 21
Dependent Claim
15 words
The process as defined by claim 2, said co-catalyst (ii) having the structural formula (VII).
Claim 22
Dependent Claim
15 words
The process as defined by claim 2, said co-catalyst (ii) having the structural formula (VIII).
Claim 23
Dependent Claim
15 words
The process as defined by claim 3, said co-catalyst (ii) having the structural formula (IX).
Claim 24
Dependent Claim
15 words
The process as defined by claim 3, said co-catalyst (ii) having the structural formula (X).
Claim 25
Dependent Claim
15 words
The process as defined by claim 3, said co-catalyst (ii) having the structural formula (XI).
Claim 26
Dependent Claim
15 words
The process as defined by claim 3, said co-catalyst (ii) having the structural formula (XII).
Claim 27
Dependent Claim
21 words
The process as defined by claim 1, further comprising end-capping the resulting high molecular weight organopolysiloxane with trimethylchlorosilane, dimethylvinylchlorosilane or methyldivinylchlorosilane.
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) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |