US4677169A
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Silicone-organic block polymers and method for making
Assignee: General Electric Co
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Filing: 1986-03-17
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Granted: 1987-06-30
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Expires: 2006-03-17
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 in the 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
2026-11-03 08:53
CPC Classifications
C; C08; C08F; C08F283/00; C08F283/12; C08F283/124; C08F293/00; C08G; C08G77/00; C08G77/42; C08G77/442
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
42 words
Silicone-organic block polymer comprising the reaction product of a free radical polymerizable organic monomer and a polydiorganosiloxane prepolymer having on its backbone, or in its terminal position, at least one chemically combined bissilylpinacolate radical capable of forming a free-radical initiator upon thermolysis.
Claim 2
Dependent Claim
42 words
Silicone-organic block polymer comprising the reaction product of a free radical polymerizable organic monomer and a polydiorganosiloxane prepolymer having on its backbone, or in its terminal position, at least one chemically combined bissilylpinacolate radical capable of forming a free-radical initiator upon thermolysis.
Claim 3
Dependent Claim
14 words
A silicone-organic block polymer in accordance with claim 1 useful as an E-beam resist.
Claim 4
Dependent Claim
23 words
A silicone-organic block polymer in accordance with claim 1, where the free-radical polymerizable organic monomer is a halogenated free radical polymerizable organic monomer.
Claim 5
Dependent Claim
18 words
A silicone-organic block polymer in accordance with claim 3, where the halogenated free-radical polymerizable organic monomer is 4-bromostyrene.
Claim 6
Dependent Claim
18 words
A silicone-organic block polymer in accordance with claim 3, where the halogenated free-radical polymerizable organic monomer is 4-chlorostyrene.
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) | 1990-06-29 | 1990-12-29 | 1991-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-29 | 1994-12-29 | 1995-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-29 | 1998-12-29 | 1999-06-30 | $7700.00 | Window Closed / Lapsed |