US4075169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorosiloxydiphenylsiloxy block copolymers
Assignee: General Electric Co
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Filing: 1976-12-15
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Granted: 1978-02-21
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Expires: 1996-12-15
Abstract
Abstract There is provided by the present invention a process for producing a solvent resistant block copolymer having desirable processability comprising reacting perfluoroalkylethylene substituted cyclic trisiloxane in the presence of a solvent promoter which may be tetrahydrofuran and in the presence of a dilithium compound catalyst and then adding a diphenyl cyclic trisiloxane and allowing the reaction to go to the completion.
Inventors
- 👤 John S. Razzano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:25
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/22; C08G77/24; C08G77/42; C08G77/44
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
108 words
A process for producing a solvent resistant block copolymer comprising (a) reacting in an anhydrous system a trimer of the formula, [(R) (R' CH.sub.2 CH.sub.2) SiO].sub.3 in the presence of a solvent promoter selected from the class consisting of tetrahydrofuran, dioxane, dimethylformamide, dimethylsulfoxide, tetramethyl urea, and a catalyst which is a dilithium compound selected from the class of compounds of the formula, ##STR6## and compounds of the formula, ##STR7## where R 2 and R 3 are selected from the class consisting of hydrogen and lower alkyl radicals of 1 to 8 carbon atoms, and then adding a trimer of the formula, [(C.sub.6 H.sub.5).sub.2 SiO].sub.3 and completing the reaction.
Claim 2
Dependent Claim
108 words
A process for producing a solvent resistant block copolymer comprising (a) reacting in an anhydrous system a trimer of the formula, [(R) (R' CH.sub.2 CH.sub.2) SiO].sub.3 in the presence of a solvent promoter selected from the class consisting of tetrahydrofuran, dioxane, dimethylformamide, dimethylsulfoxide, tetramethyl urea, and a catalyst which is a dilithium compound selected from the class of compounds of the formula, ##STR6## and compounds of the formula, ##STR7## where R 2 and R 3 are selected from the class consisting of hydrogen and lower alkyl radicals of 1 to 8 carbon atoms, and then adding a trimer of the formula, [(C.sub.6 H.sub.5).sub.2 SiO].sub.3 and completing the reaction.
Claim 3
Dependent Claim
85 words
The process of claim 1 wherein the reaction is carried out in two reaction periods wherein the first reaction period comprises reacting the fluorosilicone trimer at a temperature in the range of 55° C to 85° C for a period of time varying from 0.5 to 4 hours and then adding the diphenyl trimer in a second reaction period comprising reacting the trimers at a temperature in the range of 85° to 180° C for a period of time varying from 1 to 8 hours.
Claim 4
Dependent Claim
33 words
The process of claim 2 wherein in said second reaction period the solvent promoter is removed and there is added a high boiling solvent to complete the polymerization in said second reaction period.
Claim 5
Dependent Claim
26 words
The process of claim 3 wherein said high boiling solvent is selected from the class consisting of dichlorobenzene and the dimethoxyether of diethylene glycol and phenylether.
Claim 6
Dependent Claim
38 words
The process of claim 1 wherein after said second reaction period further comprising neutralizing said catalyst with a neutralizing agent selected from the class consisting of water, acetic acid, and an aliphatic alcohol and stripping off the solvent.
Claim 7
Dependent Claim
23 words
The process of claim 1 wherein the catalyst is utilized at a concentration of 0.7 to 8.0 millimoles, per mole of trimer reactants.
Claim 8
Dependent Claim
20 words
The process of claim 1 wherein the promoter solvent utilized is at least of sufficient quantity of dissolve the reactants.
Claim 9
Dependent Claim
37 words
The process of claim 1 wherein in step (a) there is also reacted a cyclictrisiloxane of the formula, [R Vi SiO].sub.3 where R is an alkyl radical of 1 to 8 carbon atoms and Vi is vinyl.
References Cited (Backward Citations)
US3337497A
Cited
US3503926A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |