US4332855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric compositions
Assignee: Raychem Corp
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Filing: 1978-04-14
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Granted: 1982-06-01
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Expires: 1998-04-14
Abstract
Abstract New polymeric compositions based on polytetramethylene terephthalate (PTMT) polymers are disclosed. PTMT polymers are subject to embrittlement, especially at elevated temperatures and when a flame retardant is incorporated therein. This problem is substantially reduced by blending the PTMT polymer with a second polymer which has a flex modulus of 500 to 100,000 psi and a solubility parameter within +/-1.5 of the PTMT polymer, for example an ethylene/vinyl acetate copolymer or a block copolymer containing polyether and polyester blocks. The compositions are particularly useful as wire insulation.
Inventors
- 👤 Steven C. Zingheim
- 👤 Hans E. Lunk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:23
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02; C08K; C08K5/00; C08K5/0008; C08K5/0066; C08K5/04; C08K5/06; C08L23/00; C08L23/02; C08L23/04; C08L31/00; C08L31/02; C08L31/04; C08L53/00; C08L71/00; C08L71/02; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/31504; Y10T428/31678; Y10T428/31681
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
137 words
A wire having a melt-extruded insulating coating thereon of a composition which comprises an intimate mixture of (1) a polyester in which at least 90 mole % of the repeating units are tetramethylene terephthalate units and which has a solubility parameter S; (2) 10 to 40% by weight, based on the weight of the polyester, of a second polymer which (a) has a flex modulus of 500 to 40,000 psi, and (b) has solubility parameter of (S+1.5) to (S-1.5); and (3) flame retardant in an amount such that the ratio by weight of the second polymer to the flame retardant is at least 0.5:1, the flame retardant comprising bromine-containing organic flame retardant in an amount such that the composition contains 5 to 30% by weight, based on the weight of the composition, of bromine-containing organic flame retardant.
Claim 2
Dependent Claim
137 words
A wire having a melt-extruded insulating coating thereon of a composition which comprises an intimate mixture of (1) a polyester in which at least 90 mole % of the repeating units are tetramethylene terephthalate units and which has a solubility parameter S; (2) 10 to 40% by weight, based on the weight of the polyester, of a second polymer which (a) has a flex modulus of 500 to 40,000 psi, and (b) has solubility parameter of (S+1.5) to (S-1.5); and (3) flame retardant in an amount such that the ratio by weight of the second polymer to the flame retardant is at least 0.5:1, the flame retardant comprising bromine-containing organic flame retardant in an amount such that the composition contains 5 to 30% by weight, based on the weight of the composition, of bromine-containing organic flame retardant.
Claim 3
Dependent Claim
12 words
A wire according to claim 1 wherein the polyester is polytetramethylene terephthalate.
Claim 4
Dependent Claim
19 words
A wire according to claim 1 wherein the second polymer has a flex modulus of less than 10,000 psi.
Claim 5
Dependent Claim
18 words
A wire according to claim 1 wherein the second polymer has a solubility parameter of (S+1) to (S-1).
Claim 6
Dependent Claim
153 words
A composition which comprises an intimate mixture of (1) a polyester in which at least 90 mole % of the repeating units are tetramethylene terephthalate units and which has a solubility parameter S; (2) 10 to 40% by weight, based on the weight of the polyester of a block copolymer in which one of the blocks is composed of poly tetramethylene terephthalate and the other is composed of poly tetramethylene oxide, wherein the block copolymer (a) has a flex modulus of 500 to 40,000 psi, and (b) has a solubility parameter of (S+1.5) to (S-1.5); and (3) flame retardant in an amount such that the ratio by weight of the block copolymer to the flame retardant is at least 0.5:1, the flame retardant comprising bromine-containing organic flame retardant in an amount such that the composition contains 5 to 30% by weight, based on the weight of the composition of bromine-containing organic flame retardant.
Claim 7
Dependent Claim
153 words
A composition which comprises an intimate mixture of (1) a polyester in which at least 90 mole % of the repeating units are tetramethylene terephthalate units and which has a solubility parameter S; (2) 10 to 40% by weight, based on the weight of the polyester of a block copolymer in which one of the blocks is composed of poly tetramethylene terephthalate and the other is composed of poly tetramethylene oxide, wherein the block copolymer (a) has a flex modulus of 500 to 40,000 psi, and (b) has a solubility parameter of (S+1.5) to (S-1.5); and (3) flame retardant in an amount such that the ratio by weight of the block copolymer to the flame retardant is at least 0.5:1, the flame retardant comprising bromine-containing organic flame retardant in an amount such that the composition contains 5 to 30% by weight, based on the weight of the composition of bromine-containing organic flame retardant.
Claim 8
Dependent Claim
19 words
A wire according to claim 1 wherein said composition also comprises 3 to 15% by weight of antimony trioxide.
Claim 9
Dependent Claim
20 words
A wire according to claim 1 wherein said second polymer is a block copolymer of polytetramethylene terephthalate and polytetramethylene oxide.
Claim 10
Dependent Claim
17 words
A wire having a melt-extruded insulating coating thereon, said coating comprising the composition defined in claim 6.
Claim 11
Dependent Claim
15 words
A composition according to claim 1 wherein the brominated organic flame retardant is decabromo-diphenyl ether.
Claim 12
Dependent Claim
14 words
A wire according to claim 1 wherein said composition is free of reinforcing fillers.
Claim 13
Dependent Claim
21 words
A wire according to claim 1 wherein said composition contains 0 to 10% by weight of fillers, processing aids and stabilisers.
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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) | 1985-05-31 | 1985-11-30 | 1986-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-31 | 1989-11-30 | 1990-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-31 | 1993-11-30 | 1994-06-01 | $7700.00 | Window Closed / Lapsed |