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US4525531A
Expired / Lapsed
US
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Polymeric compositions suitable for use in the medical field and containing a polyolefin, a polysiloxane and an elastomer
Assignee: Raychem Corp
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Filing: 1983-04-26
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Granted: 1985-06-25
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Expires: 2003-04-26
Abstract
Abstract Polymeric compositions comprising 5-60%, preferably 12 to 40%, of a thermoplastic olefin polymer, 1-10%, preferably 2 to 6%, of a siloxane polymer and 30-94%, preferably 58 to 86%, of an elastomer. The olefin polymer can be polyethylene or a polar ethylene copolymer. The siloxane polymer can contain polycarbonate blocks. The elastomer can be an amorphous polyamide of low crystallinity, a thermoplastic elastomer, an ionomer, or a styrene/butadiene copolymer. The compositions are particularly useful in the medical field, for example in the form of tubing.
Inventors
- 👤 Mimzee Zukosky
- 👤 Ronald L. Dieck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:09
CPC Classifications
A; A61; A61L; A61L29/00; A61L29/04; A61L29/049; A61L27/00; A61L27/14; A61L27/26; C; C08; C08L; C08L21/00; C08L53/00; C08L53/02; C08L2205/00; C08L2205/03; C08L67/00; C08L67/02; C08L77/00; C08L83/00; C08L83/04; C08L9/00; C08L9/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
95 words
A polymeric composition which comprises (a) 12 to 40% by weight of a thermoplastic polymer comprising units derived from an olefin, (b) 1 to 10% by weight of a polymer which is solid at room temperature and which is a block copolymer comprising polysiloxane blocks and at least 10% by weight of polycarbonate blocks, and (c) 48 to 88% by weight of a styrene-butadiene elastomer having a Shore D Hardness of less than 60, the amounts of components (a), (b) and (c) being by weight, based on the total weight of (a), (b) and (c).
Claim 2
Dependent Claim
95 words
A polymeric composition which comprises (a) 12 to 40% by weight of a thermoplastic polymer comprising units derived from an olefin, (b) 1 to 10% by weight of a polymer which is solid at room temperature and which is a block copolymer comprising polysiloxane blocks and at least 10% by weight of polycarbonate blocks, and (c) 48 to 88% by weight of a styrene-butadiene elastomer having a Shore D Hardness of less than 60, the amounts of components (a), (b) and (c) being by weight, based on the total weight of (a), (b) and (c).
Claim 3
Dependent Claim
20 words
A composition according to claim 1 wherein the polymer (b) comprises poly(dimethyl siloxane) blocks and polycarbonate blocks derived from Bisphenol-A.
References Cited (Backward Citations)
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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) | 1988-06-24 | 1988-12-24 | 1989-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-24 | 1992-12-24 | 1993-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-24 | 1996-12-24 | 1997-06-25 | $7700.00 | Window Closed / Lapsed |