US4584356A
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Method for making silicone-organic block polymers
Assignee: General Electric Co
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Filing: 1984-11-02
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Granted: 1986-04-22
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Expires: 2004-11-02
Abstract
Abstract A method is provided for making silicone-organic block polymers, such as polydimethylsiloxane-polystyrene block polymers resulting from the thermal generation of free-radicals in the presence of free-radical polymerizable organic monomer. A silicone prepolymer is used having chemically combined pinacolate groups the in backbone or terminal positions which are capable of generating free-radicals upon thermolysis and which retain chemically combined remnants of such pinacolate diradicals which serve as connecting sites for free-radical polymerized organic blocks.
Inventors
- 👤 James V. Crivello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:50
CPC Classifications
C; C08; C08F; C08F283/00; C08F283/12; C08F283/124
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
76 words
A method for making silicone-organic block polymers which comprises, (A) initiating the free-radical polymerization of a free radical polymerizable organic monomer by heating in the presence of an organic solvent, a mixture of such free-radical polymerizable organic monomer and a polydiorganosiloxane having in its backbone or in the terminal position, at least one chemically combined bissilylpinacolate radical capable of forming a free-radical initiator upon thermolysis, (B) recovering a silicone-organic block polymer from the mixture of (A).
Claim 2
Independent Claim
76 words
A method for making silicone-organic block polymers which comprises, (A) initiating the free-radical polymerization of a free radical polymerizable organic monomer by heating in the presence of an organic solvent, a mixture of such free-radical polymerizable organic monomer and a polydiorganosiloxane having in its backbone or in the terminal position, at least one chemically combined bissilylpinacolate radical capable of forming a free-radical initiator upon thermolysis, (B) recovering a silicone-organic block polymer from the mixture of (A).
Claim 3
Dependent Claim
13 words
A method in accordance with claim 1 where the organic monomer is styrene.
Claim 4
Dependent Claim
13 words
A method in accordance with claim 1 where the organic monomer is acrylonitrile.
Claim 5
Dependent Claim
19 words
A method in accordance with claim 1 where the organic monomer is a mixture of styrene and acrylic acid.
Claim 6
Dependent Claim
13 words
A method in accordance with claim 1 where the organic monomer is methylmethacrylate.
Claim 7
Dependent Claim
12 words
A method in accordance with claim 1 where the monomer is 4-chlorostyrene.
Claim 8
Dependent Claim
20 words
A method in accordance with claim 1 where the vinyl pinacolate used for the synthesis of the polydiorganosiloxane is bis(dimethylvinylsilyl)benzopinacolate.
Claim 9
Dependent Claim
20 words
A method in accordance with claim 1 where the vinyl pinacolate used for the synthesis of the polydiorganosiloxane is bis(dimethylvinylsilyl)fluorenonepinacolate.
Claim 10
Dependent Claim
20 words
A method in accordance with claim 1 where the vinyl pinacolate used for the synthesis of the polydiorganosiloxane is bis(methylphenylvinylsilyl)benzopinacolate.
Claim 11
Dependent Claim
20 words
A method in accordance with claim 1 where the vinyl pinacolate used for the synthesis of the polydiorganosiloxane is ##STR10##
Claim 12
Dependent Claim
12 words
Silicone-organic block polymer made in accordance with the method of claim 1.
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) | 1989-04-21 | 1989-10-21 | 1990-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-21 | 1993-10-21 | 1994-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-21 | 1997-10-21 | 1998-04-22 | $7700.00 | Window Closed / Lapsed |