US4039610A
Expired / Lapsed
US
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Method of making an oriental dimensionally stable article from a high softening aromatic polymer or copolymer
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1975-08-28
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Granted: 1977-08-02
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Expires: 1995-08-28
Abstract
Abstract Highly unusual and useful novel high-performance, oriented, low-crystalline, essentially heterocyclic structures, e.g. films, are prepared from certain novel and important process sequences. These structures, e.g. films and fibers, possess a unique combination of minimal shrinkage at high temperatures, after orientation, coupled with negligible coefficient of expansion over an unusually wide temperature range.
Inventors
- 👤 Burnett H. Johnson
- 👤 Don J. Henderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:48
CPC Classifications
D; D02; D02J; D02J1/00; D02J1/22; B; B29; B29C; B29C55/00; B29C55/02; D01; D01F; D01F6/00; D01F6/58; D01F6/74; D01F6/76
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
155 words
A method of obtaining a dimensionally stable oriented shaped article formed from a high softening temperature aromatic-containing polymer or copolymer having a Tg greater than 200° C., a thermal co-efficient of expansion (a) of from +1.6 × to -3.0 × 10 - 5 deg. - 1 and for PPA a birefringence value of from 0.05 to 0.2 and wherein said article has been elongated at least 25% more than its non-oriented value in one direction which comprises in combination the steps of: a. heating a shaped article of said high softening temperature aromatic-containing polymer of a temperature from 20° C. below to 5° C. above its Tg, b. drawing said article at a rate of 10 to 10,000 percent per minute in at least one direction at said temperature until an elongation of at least 25% over that of the original dimension is obtained, c. quenching the as drawn said article by any convenient means.
Claim 2
Independent Claim
155 words
A method of obtaining a dimensionally stable oriented shaped article formed from a high softening temperature aromatic-containing polymer or copolymer having a Tg greater than 200° C., a thermal co-efficient of expansion (a) of from +1.6 × to -3.0 × 10 - 5 deg. - 1 and for PPA a birefringence value of from 0.05 to 0.2 and wherein said article has been elongated at least 25% more than its non-oriented value in one direction which comprises in combination the steps of: a. heating a shaped article of said high softening temperature aromatic-containing polymer of a temperature from 20° C. below to 5° C. above its Tg, b. drawing said article at a rate of 10 to 10,000 percent per minute in at least one direction at said temperature until an elongation of at least 25% over that of the original dimension is obtained, c. quenching the as drawn said article by any convenient means.
Claim 3
Dependent Claim
48 words
A method according to claim 1 wherein said resulting quenched article is subjected to the additional step of heat treating by at least momentarily heating in air to a temperature of from 50° C. above its intended maximum use temperature or 10° C. below its T g .
Claim 4
Dependent Claim
22 words
The process according to claim 1 wherein said article is drawn as in step (b) in two directions to produce biaxial orientation.
Claim 5
Dependent Claim
30 words
The process according to claim 1 wherein said heating of step (a) is from a temperature 10° C. below to 2° C. above the Tg of the aromatic containing polymer.
Claim 6
Independent Claim
151 words
A method of obtaining a dimensionally stable oriented shaped article formed from a high softening temperature aromatic-containing polymer or copolymer PPA having a thermal co-efficient of expansion (a) of from +1.6 × 10 - 5 - to -3.0 × 10 - 5 deg. - 1 and a birefringence value of from 0.05 to 0.2 and wherein said article has been elongated at least 25% more than it non-oriented value in one direction which comprises in combination the steps of: a. heating a shaped article of said high softening temperature aromatic-containing polymer to a temperature from 40° C. below to 10° C. above its Tg, b. drawing said article at a rate of 10 to 10,000 percent per minute in at least one direction at said temperature until an elongation of at least 25% over that of the original dimension obtained. c. quenching the as drawn said article by any convenient means.
Claim 7
Independent Claim
151 words
A method of obtaining a dimensionally stable oriented shaped article formed from a high softening temperature aromatic-containing polymer or copolymer PPA having a thermal co-efficient of expansion (a) of from +1.6 × 10 - 5 - to -3.0 × 10 - 5 deg. - 1 and a birefringence value of from 0.05 to 0.2 and wherein said article has been elongated at least 25% more than it non-oriented value in one direction which comprises in combination the steps of: a. heating a shaped article of said high softening temperature aromatic-containing polymer to a temperature from 40° C. below to 10° C. above its Tg, b. drawing said article at a rate of 10 to 10,000 percent per minute in at least one direction at said temperature until an elongation of at least 25% over that of the original dimension obtained. c. quenching the as drawn said article by any convenient means.
Claim 8
Dependent Claim
17 words
The process according to claim 5 wherein the temperature of orientation is about 250° to 300° 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) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |