US4066594A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing a polysiloxane
Assignee: General Electric Co
•
Filing: 1976-08-04
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Granted: 1978-01-03
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Expires: 1996-08-04
Abstract
Abstract A novel process is disclosed for the preparation of a polysiloxane that is useful in the preparation of an emulsion for rendering flexible sheet material non-adherent to surfaces which normally adhere thereto.
Inventors
- 👤 Richard E. Moeller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:50
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06; C08G77/14; C08G77/20; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
177 words
A process for preparing a polysiloxane having the fromula: ##STR6## wherein R is a monovalent hydrocarbon radical free of unsaturation; R 1 is a hydrocarbon radical having vinyl unsaturation; x and y are positive integers so that the silanol stopped polysiloxane has from 0.1 to 1% by weight of R 1 groups and the viscosity of the polymer ranges between 25,000 centipoises and 1,000,000 centipoises said process comprising: a. homogenizing a mixture which consists essentially of: i. a compound of the formula (R 2 SiO) 4 wherein R is a monovalent hydrocarbon free of unsaturation; or ii. a compound of the formula: (RR.sup.1 SiO).sub.4 wherein R is the same as hereinabove defined and R 1 is a hydrocarbon radical having vinyl unsaturation; and iii. a benzene sulfonic acid compound of the formula: ##STR7## wherein R 2 is an alkyl group of from 6-18 carbon atoms and; iv. water; b. heating the homogenized mixture of (a) to form said polysiloxane; and c. adding a neutralizing amount of an alkanolamine to said mixture to neutralize said benzene sulfonic acid.
Claim 2
Dependent Claim
177 words
A process for preparing a polysiloxane having the fromula: ##STR6## wherein R is a monovalent hydrocarbon radical free of unsaturation; R 1 is a hydrocarbon radical having vinyl unsaturation; x and y are positive integers so that the silanol stopped polysiloxane has from 0.1 to 1% by weight of R 1 groups and the viscosity of the polymer ranges between 25,000 centipoises and 1,000,000 centipoises said process comprising: a. homogenizing a mixture which consists essentially of: i. a compound of the formula (R 2 SiO) 4 wherein R is a monovalent hydrocarbon free of unsaturation; or ii. a compound of the formula: (RR.sup.1 SiO).sub.4 wherein R is the same as hereinabove defined and R 1 is a hydrocarbon radical having vinyl unsaturation; and iii. a benzene sulfonic acid compound of the formula: ##STR7## wherein R 2 is an alkyl group of from 6-18 carbon atoms and; iv. water; b. heating the homogenized mixture of (a) to form said polysiloxane; and c. adding a neutralizing amount of an alkanolamine to said mixture to neutralize said benzene sulfonic acid.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein said polysiloxane has the formula: ##STR8##
Claim 4
Dependent Claim
18 words
The process of claim 1 wherein a platinum catalyst is included in the homogenized mixture of step (a).
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein the heating step (b) comprises heating the homogenized mixture at a temperature of from 40°-100°.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein heating step (b) is followed by a cooling step.
Claim 7
Dependent Claim
13 words
The process of claim 1 wherein the benzene sulfonic acid is dodecylbenzenesulfonic acid.
Claim 8
Dependent Claim
31 words
The process of claim 1 wherein the alkanolamine is selected from compounds of the formula: (R.sup.3 OH).sub.3 H wherein R 3 is lower alkyl of from 1 to 8 carbon atoms.
Claim 9
Dependent Claim
12 words
The process of claim 1 wherein said polysiloxane has the formula: ##STR9##
Claim 10
Dependent Claim
32 words
A process as defined in claim 3 wherein the platinum catalyst is present in an amount to provide one platinum atom per 100 to 1,000,000 silicon-bonded vinyl groups in the polyorganosiloxane component.
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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) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |