US4826946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
New polysiloxane block copolymers
Assignee: Bayer AG
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Filing: 1987-06-04
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Granted: 1989-05-02
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Expires: 2007-06-04
Abstract
Abstract Multi-block copolymers of recurring structural units of polysiloxanes and recurring structural units of aliphatic polyesters, polyethers or polyetheresters with rubber properties, the individual polymeric blocks constituting rubber-type products with glass transition temperatures below practical usefulness and a process for their production.
Inventors
- 👤 Herbert Eichenauer
- 👤 Christian Lindner
- 👤 Karl-Heinz Ott
- 👤 Peter Orth
- 👤 Hartwig Hocker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:36
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/42; C08G77/445; C08G77/46
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
165 words
A process for the production of block-type rubber polymers of recurring structural units (I) --[A--B--]--.sub.n (I) wherein A represents a bifunctional polysiloxane radical of the formula --[--(R.sup.1)(R.sup.2)SiO--].sub.x -- (II) wherein R 1 is aryl or alkyl and R 2 is alkyl or aryl and x is a number such that the molecular weight of (II) is at least 500, B has molecular weight of at least 800, the glass transition temperatures of A and B are below 20° and n is integer of 3 to 500, said process comprising polycondensing an aliphatic polyester diol of the formula HO--B--OH (III) and a polysiloxane of the formula ##STR5## under separation of the acid R 3 COOH, wherein R 3 is C 1 -C 18 alkyl and the compound of the formula (III) has an average molecular weight of from 800 to 12,000 and the compound of the formula IV has an average molecular weight of from 500 to 20,000, said molecular weights determined by gel permeation chromatography.
Claim 2
Dependent Claim
165 words
A process for the production of block-type rubber polymers of recurring structural units (I) --[A--B--]--.sub.n (I) wherein A represents a bifunctional polysiloxane radical of the formula --[--(R.sup.1)(R.sup.2)SiO--].sub.x -- (II) wherein R 1 is aryl or alkyl and R 2 is alkyl or aryl and x is a number such that the molecular weight of (II) is at least 500, B has molecular weight of at least 800, the glass transition temperatures of A and B are below 20° and n is integer of 3 to 500, said process comprising polycondensing an aliphatic polyester diol of the formula HO--B--OH (III) and a polysiloxane of the formula ##STR5## under separation of the acid R 3 COOH, wherein R 3 is C 1 -C 18 alkyl and the compound of the formula (III) has an average molecular weight of from 800 to 12,000 and the compound of the formula IV has an average molecular weight of from 500 to 20,000, said molecular weights determined by gel permeation chromatography.
Claim 3
Dependent Claim
38 words
A process according to claim 1 wherein the condensation is carried out in the presence of a carbonate of alkali metal or a carbonate of alkaline earth metal, a tertiary amine, a phosphine or a Lewis base compound.
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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) | 1992-05-01 | 1992-10-31 | 1993-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-01 | 1996-10-31 | 1997-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-01 | 2000-10-31 | 2001-05-02 | $7700.00 | Window Closed / Lapsed |