US4508769A
Expired / Lapsed
US
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Process to form amorphous, crystallizable thermoplastic polymers
Assignee: Honeywell International Inc
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Filing: 1984-02-15
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Granted: 1985-04-02
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Expires: 2004-02-15
Abstract
Abstract A method of forming an amorphous crystallizable thermoplastic polymer composition. The polymer composition has a modulus of rigidity which decreases to a minimum value with increasing temperature and then begins to increase. The process includes heating polymer to below a temperature at which crystal formation occurs and form the polymer. The polymer composition is then heated to a temperature at which crystal formation can occur and be annealed. This process is useful to make articles having a thickness of from 0.127 cm (0.050 inches) to 1.27 cm (0.50 inches) such as sheets and tubes of the amorphous polymer and then reforming and annealing them.
Inventors
- 👤 Nicholas Vanderkooi, Jr.
- 👤 Philip E. Stevenson
- 👤 Robert J. Welgos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:33
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/88; C08J; C08J3/00; C08J5/00; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/139
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
93 words
An article of manufacture made of a crystallizable amorphous thermoplastic polymer composition having a modulus of rigidity G which decreases with increasing temperature to a G min at T min and subsequently increases with increasing temperature from G min to G cry at T cry at which point there is a decrease in the rate at which G changes with increasing temperature, the polymer crystallizing below T cc upon cooling from a temperature above T cc , the article having a thickness of from 0.127 cm (0.050 inches) to 1.27 cm (0.500 inches).
Claim 2
Dependent Claim
93 words
An article of manufacture made of a crystallizable amorphous thermoplastic polymer composition having a modulus of rigidity G which decreases with increasing temperature to a G min at T min and subsequently increases with increasing temperature from G min to G cry at T cry at which point there is a decrease in the rate at which G changes with increasing temperature, the polymer crystallizing below T cc upon cooling from a temperature above T cc , the article having a thickness of from 0.127 cm (0.050 inches) to 1.27 cm (0.500 inches).
Claim 3
Dependent Claim
13 words
The article as recited in claim 1 in the form of a sheet.
Claim 4
Dependent Claim
13 words
The article as recited in claim 1 in the form of a tube.
Claim 5
Dependent Claim
21 words
The article as recited in claim 1 wherein the thickness is from 0.127 cm (0.050 inches) to 0.635 cm (0.025 inches).
Claim 6
Dependent Claim
16 words
The article as recited in claim 1 wherein the polymer composition is polyepsiloncaprolactam and lithium salt.
Claim 7
Dependent Claim
27 words
The article as recited in claim 1 wherein the polymer composition comprises polyepsiloncaprolactam and 0.2 to 2.0 percent by weight based on the polycaprolactam of lithium chloride.
Claim 8
Dependent Claim
15 words
The article as recited in claim 1 wherein the polymer composition is a polyamide terpolymer.
Claim 9
Dependent Claim
48 words
The article as recited in claim 6 wherein the polyamide terpolymer is selected from the class of: epsiloncaprolactam, terephthalic acid and bis(p-aminocyclohexyl)methane; epsiloncaprolactam, bis-amino methyl cyclohexane and terephthalic acid; epsiloncaprolactam, bis-amino methyl cyclohexane and isophthalic acid; hexamethylene, diamine, azelaic acid and epsiloncaprolactam; and epsiloncaprolactam and amino undecanoic acid.
Claim 10
Dependent Claim
14 words
The article as recited in claim 8 wherein the polymer composition comprises polyethylene terephthalate.
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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) | 1988-04-01 | 1988-10-01 | 1989-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-01 | 1992-10-01 | 1993-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-01 | 1996-10-01 | 1997-04-02 | $7700.00 | Window Closed / Lapsed |