US4387196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of silicone resins
Assignee: Raychem Ltd
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Filing: 1982-02-18
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Granted: 1983-06-07
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Expires: 2002-02-18
Abstract
Abstract The invention relates to a novel process for the production of a thermoplastic, high softening point polysiloxane resin which comprises reacting a solvent-soluble partially condensed organosiloxane with a silane capping agent. The resins so produced are useful as electrical insulator material and also as hold out agents for heat recoverable articles.
Inventors
- 👤 Jean-Claude Bonnet
- 👤 Kenneth B. Pithouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:13
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06; C08G77/10; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/14; C08K5/16; C08K5/34
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
143 words
A process for the production of a thermoplastic, high softening point polysiloxane resin which comprises the steps of: (a) reacting a solvent-soluble partially condensed organosiloxane having the unit formula: (RSiO.sub.1.5).sub.a (R'R"SiO).sub.b wherein R and R' are each independently hydrogen or an organic group, at least 85% of the R groups in the RSiO 1 .5 units being organic groups, R" is an organic group, a is from 0.6 to 1, b is 0 to 0.4, and a+b=1, and wherein the organosiloxane comprises Si-OH groups capable of further condensation, the percentage by weight, based on the weight of the resin, of said hydroxyl groups being from 1 to 10, with a silane capping agent so as to cap some of the Si--OH groups, and (b) equilibrating the product of step (a) to produce a product having a softening point in excess of 50° C.
Claim 2
Dependent Claim
143 words
A process for the production of a thermoplastic, high softening point polysiloxane resin which comprises the steps of: (a) reacting a solvent-soluble partially condensed organosiloxane having the unit formula: (RSiO.sub.1.5).sub.a (R'R"SiO).sub.b wherein R and R' are each independently hydrogen or an organic group, at least 85% of the R groups in the RSiO 1 .5 units being organic groups, R" is an organic group, a is from 0.6 to 1, b is 0 to 0.4, and a+b=1, and wherein the organosiloxane comprises Si-OH groups capable of further condensation, the percentage by weight, based on the weight of the resin, of said hydroxyl groups being from 1 to 10, with a silane capping agent so as to cap some of the Si--OH groups, and (b) equilibrating the product of step (a) to produce a product having a softening point in excess of 50° C.
Claim 3
Dependent Claim
25 words
The process of claim 1, in which the step of equilibrating comprises heating the product of step (a) in the presence of an equilibration catalyst.
Claim 4
Dependent Claim
15 words
The process of claim 1, in which R is a substituted or unsubstituted hydrocarbon group.
Claim 5
Dependent Claim
16 words
The process of claim 3, in which R is a methyl group or a phenyl group.
Claim 6
Dependent Claim
17 words
The process of claim 1 in which the groups R',R" are hydrocarbon groups or substituted hydrocarbon groups.
Claim 7
Dependent Claim
17 words
The process of claim 5, in which the groups R',R" are each independently methyl or phenyl groups.
Claim 8
Dependent Claim
18 words
The process of claim 1, in which the organic groups of the partially condensed organosiloxane are methyl groups.
Claim 9
Dependent Claim
17 words
The process of claim 6, in which up to 80% of the groups R are phenyl groups.
Claim 10
Dependent Claim
14 words
The process of claim 1, in which the partially condensed organosiloxane is a monoorganosiloxane.
Claim 11
Dependent Claim
14 words
The process of claim 9, in which the partially condensed organosiloxane is a monomethylpolysiloxane.
Claim 12
Dependent Claim
14 words
The process of claim 9, in which the partially condensed organosiloxane is a monophenylpolysiloxane.
Claim 13
Dependent Claim
32 words
The process of claim 9, in which the partially condensed organosiloxane is a monomethylmonophenylpolysiloxane in which the ratio of methyl to phenyl groups on a molar basis is from 1:4 to 4:1.
Claim 14
Dependent Claim
27 words
The process of claim 1, in which the partially condensed organosiloxane is one that has been prepared by hydrolysis of a hydrolysable organosilane or mixture of silanes.
Claim 15
Dependent Claim
13 words
The process of claim 13, in which the hydrolysable organosilane is a monoorganosilane.
Claim 16
Dependent Claim
33 words
The process of claim 14, in which the monoorganosilane has the formula RSiCl 3 , RSi(OAlk) 3 or RSi (OCOAlk) 3 where Alk represents an alkyl group and R is as previously defined.
Claim 17
Dependent Claim
24 words
The process of claim 13, in which the hydrolysis is effected by adding a solution of the organosilane in an organic solvent to water.
Claim 18
Dependent Claim
26 words
The process of claim 16, in which a co-solvent for both the water and the organic solvent is added to maintain the hydrolysis mixture substantially homogeneous.
Claim 19
Dependent Claim
24 words
The process of claim 17, in which the co-solvent is mixed with the water and the organic solvent solution of the silane added thereto.
Claim 20
Dependent Claim
19 words
The process of claim 18, in which excess organic solvent is added to the mixture of water and co-solvent.
Claim 21
Dependent Claim
15 words
The process of claim 1, in which the silane capping agent is a monofunctional organosilane.
Claim 22
Dependent Claim
61 words
The process of claim 20, in which the silane capping agent is an organosilane of formula R 1 R 2 R 3 SiCl, R 1 R 2 R 3 Si(OAlk) or R 1 R 2 R 3 Si (OCOAlk), where R 1 , R 2 and R 3 are each independently hydrogen or organic groups, and Alk represents an alkyl group.
Claim 23
Dependent Claim
21 words
The process of claim 21, in which R 1 ,R 2 and R 3 are each independently methyl or phenyl groups.
Claim 24
Dependent Claim
23 words
The process of claim 1, in which the step of reacting is carried out at a temperature of from 20° to 150° C.
Claim 25
Dependent Claim
36 words
The process of claim 2, in which the step of equilibrating comprises heating the product of step (a) at a temperature of from 60° to 150° C. for a period of from 5 to 120 minutes.
Claim 26
Dependent Claim
27 words
The process of claim 24, in which the product of step (a) is heated in a solution in an organic solvent for from 30 to 60 minutes.
Claim 27
Dependent Claim
19 words
The process of claim 2, in which the catalyst is an acid, an alkali, a metal soap, or kieselguhr.
Claim 28
Dependent Claim
16 words
The process of claim 1, including the additional step of subsequently cross-linking the resulting polysiloxane resin.
Claim 29
Dependent Claim
22 words
The process of claim 27, in which the resulting polysiloxane resin has substituents comprising olefinically unsaturated groups capable of undergoing cross-linking reactions.
Claim 30
Dependent Claim
16 words
The process of claim 28, in which the olefinically unsaturated groups are vinyl or allyl groups.
Claim 31
Dependent Claim
24 words
The process of claim 28, in which the olefinically unsaturated groups are present in an amount of up to 2% on a molar basis.
Claim 32
Dependent Claim
15 words
A thermoplastic, high softening point, polysiloxane resin produced by a process according to claim 1.
Claim 33
Dependent Claim
27 words
An article which is heat-recoverable, which can be rendered heat-recoverable or which is heat-recovered, made from the polysiloxane resin of claim 1, in non-crosslinked or crosslinked form.
Claim 34
Dependent Claim
15 words
Electrical insulation made from the polysiloxane resin of claim 1, in non-crosslinked or crosslinked form.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-06 | 1986-12-06 | 1987-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-06 | 1990-12-06 | 1991-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-06 | 1994-12-06 | 1995-06-07 | $7700.00 | Window Closed / Lapsed |