US4268470A
Expired / Lapsed
US
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Polymer materials
Assignee: BTG International Ltd
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Filing: 1978-09-19
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Granted: 1981-05-19
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Expires: 1998-09-19
Abstract
Abstract Oriented polymer material of high Young's modulus and low creep strain is provided by a process which comprises drawing polymer material having a weight average molecular weight greater than 300,000 and a ratio of weight average molecular weight to number average molecular weight greater than 5 at temperatures from 95° C. to 140° C. and at a rate such that the deformation ratio is greater than 18.
Inventors
- 👤 Giancarlo Capaccio
- 👤 Ian M. Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:43
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/04; B; B29; B29C; B29C55/00; B29C55/02; D01D; D01D5/00; D01D5/12; D01D5/16
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
102 words
A process for the preparation of an oriented polymer material comprising the steps of providing a crystallisable polypropylene homopolymer having a weight average molecular weight greater than 300,000 and a ratio of weight average molecular weight to number average molecular weight greater than 5, and attenuating said polymer at a temperature from 95° C. to 140° C. and at a rate such that the deformation ratio is greater than 18 such that said oriented polymer material has a creep strain at room temperature of less than 3% after 15 hours under stress which produces an initial strain of 1% after 10 seconds.
Claim 2
Dependent Claim
102 words
A process for the preparation of an oriented polymer material comprising the steps of providing a crystallisable polypropylene homopolymer having a weight average molecular weight greater than 300,000 and a ratio of weight average molecular weight to number average molecular weight greater than 5, and attenuating said polymer at a temperature from 95° C. to 140° C. and at a rate such that the deformation ratio is greater than 18 such that said oriented polymer material has a creep strain at room temperature of less than 3% after 15 hours under stress which produces an initial strain of 1% after 10 seconds.
Claim 3
Dependent Claim
91 words
A process for the preparation of an oriented polymer material comprising the steps of forming by extrusion a crystallisable polypropylene homopolymer having a weight average molecular weight greater than 300,000 and a ratio of weight average molecular weight to number average molecular weight greater than 5, passing said polymer into a bath maintained at a temperature from 110° C. to 125° C. immediately after extrusion, and attenuating said polymer at a temperature from 95° C. to 140° C. and at a rate such that the deformation ratio is greater than 18.
Claim 4
Dependent Claim
91 words
A process for the preparation of an oriented polymer material comprising the steps of forming by extrusion a crystallisable polypropylene homopolymer having a weight average molecular weight greater than 300,000 and a ratio of weight average molecular weight to number average molecular weight greater than 5, passing said polymer into a bath maintained at a temperature from 110° C. to 125° C. immediately after extrusion, and attenuating said polymer at a temperature from 95° C. to 140° C. and at a rate such that the deformation ratio is greater than 18.
Claim 5
Dependent Claim
102 words
A process for the preparation of an oriented polymer material comprising the steps of providing a crystallizable polyethylene homopolymer having a weight average molecular weight greater than 300,000 and a ratio of weight average molecular weight to number average molecular weight greater than 5, and attentuating said polymer at a temperature from 95° C. to 140° C. and at a rate such that the deformation ratio is greater than 18 such that said oriented polymer material has a creep strain at room temperature of less than 3% after 15 hours under stress which produces an initial strain of 1% after 10 seconds.
Claim 6
Dependent Claim
102 words
A process for the preparation of an oriented polymer material comprising the steps of providing a crystallizable polyethylene homopolymer having a weight average molecular weight greater than 300,000 and a ratio of weight average molecular weight to number average molecular weight greater than 5, and attentuating said polymer at a temperature from 95° C. to 140° C. and at a rate such that the deformation ratio is greater than 18 such that said oriented polymer material has a creep strain at room temperature of less than 3% after 15 hours under stress which produces an initial strain of 1% after 10 seconds.
Claim 7
Dependent Claim
91 words
A process for the preparation of an oriented polymer material comprising the steps of forming by extrusion a crystallizable polyethylene homopolymer having a weight average molecular weight greater than 300,000 and a ratio of weight average molecular weight to number average molecular weight greater than 5, passing said polymer into a bath maintained at a temperature from 110° C. to 125° C. immediately after extrusion, and attentuating said polymer at a temperature from 95° C. to 140° C. and at a rate such that the deformation ratio is greater than 18.
Claim 8
Dependent Claim
91 words
A process for the preparation of an oriented polymer material comprising the steps of forming by extrusion a crystallizable polyethylene homopolymer having a weight average molecular weight greater than 300,000 and a ratio of weight average molecular weight to number average molecular weight greater than 5, passing said polymer into a bath maintained at a temperature from 110° C. to 125° C. immediately after extrusion, and attentuating said polymer at a temperature from 95° C. to 140° C. and at a rate such that the deformation ratio is greater than 18.
Claim 9
Dependent Claim
23 words
A process according to claim 1, 3 or 4 wherein the attenuation is effected at a temperature from 95° C. to 130° C.
Claim 10
Dependent Claim
23 words
A process according to claim 1, 3 or 4 wherein the attenuation is effected at a temperature from 100° C. to 120° C.
Claim 11
Dependent Claim
28 words
A process according to claim 1, 3 or 4 wherein, immediately after extrusion, the polymer material is passed into a bath maintained at 110° C. to 125° C.
Claim 12
Dependent Claim
42 words
An oriented polymer material prepared by the process of claim 1, 3 or 4 and having a creep strain at room temperature of less than 3% after 15 hours under a stress which produces an initial strain of 1% after 10 seconds.
Claim 13
Dependent Claim
103 words
A process for the preparation of an oriented polymer material comprising the steps of providing a crystallizable ethylene-propylene block copolymer having a weight average molecular weight greater than 300,000 and a ratio of weight average molecular weight to number average molecular weight greater than 5, and attentuating said polymer at a temperature from 95° C. to 140° C. and at a rate such that the deformation ratio is greater than 18 such that said oriented polymer material has a creep strain at room temperature of less than 3% after 15 hours under stress which produces an initial strain of 1% after 10 seconds.
Claim 14
Dependent Claim
103 words
A process for the preparation of an oriented polymer material comprising the steps of providing a crystallizable ethylene-propylene block copolymer having a weight average molecular weight greater than 300,000 and a ratio of weight average molecular weight to number average molecular weight greater than 5, and attentuating said polymer at a temperature from 95° C. to 140° C. and at a rate such that the deformation ratio is greater than 18 such that said oriented polymer material has a creep strain at room temperature of less than 3% after 15 hours under stress which produces an initial strain of 1% after 10 seconds.
Claim 15
Dependent Claim
92 words
A process for the preparation of an oriented polymer material comprising the steps of forming by extrusion a crystallizable ethylene-propylene block copolymer having a weight average molecular weight greater than 300,000 and a ratio of weight average molecular weight to number average molecular weight greater than 5, passing said polymer into a bath maintained at a temperature from 110° C. to 125° C. immediately after extrusion, and attentuating said polymer at a temperature from 95° C. to 140° C. and at a rate such that the deformation ratio is greater than 18.
Claim 16
Dependent Claim
92 words
A process for the preparation of an oriented polymer material comprising the steps of forming by extrusion a crystallizable ethylene-propylene block copolymer having a weight average molecular weight greater than 300,000 and a ratio of weight average molecular weight to number average molecular weight greater than 5, passing said polymer into a bath maintained at a temperature from 110° C. to 125° C. immediately after extrusion, and attentuating said polymer at a temperature from 95° C. to 140° C. and at a rate such that the deformation ratio is greater than 18.
Claim 17
Dependent Claim
26 words
A process according to claim 1, 2, 3, 4, 9 or 10 wherein the attenuation is effected at a temperature from 110° C. to 140° C.
Claim 18
Dependent Claim
26 words
A process according to claim 1, 2, 3, 4, 9 or 10 wherein the attenuation is effected at a temperature from 105° C. to 140° C.
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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) | 1984-05-18 | 1984-11-17 | 1985-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-18 | 1988-11-17 | 1989-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-18 | 1992-11-17 | 1993-05-19 | $7700.00 | Window Closed / Lapsed |