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Patent US3903042A successfully refreshed from Google Patents.
US3903042A
Expired / Lapsed
US
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Stabilized polyalkylene terephthalate resin composition
Assignee: Celanese Corp
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Filing: 1974-06-11
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Granted: 1975-09-02
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Expires: 1994-06-11
Abstract
Abstract A stabilized polyalkylene terephthalate resin composition is disclosed. The polyalkylene terephthalate resin composition comprises a polyalkylene terephthalate resin selected from the group consisting of polypropylene terephthalate and polybutylene terephthalate, 2 to 60 percent of the total composition of a reinforcing filler and up to below 1 percent by weight of the total composition of a polyamide, preferably polycaprolactam. The composition retains a higher degree of tensile strength after high temperature long-term aging than does any polyalkylene terephthalate composition of the prior art.
Inventors
- 👤 John S Gall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:22
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
116 words
A STABILIZED POLYALKYLENE TEREPHTHALATE RESIN COMPOSITION COMPRISING: A POLYALKYLENE TEREPHTHALATE SELECTED FROM THE GROUP CONSISTING OF POLYPROPYLENE TEREPHTHALATE AND POLYBUTYLENE TEREPHTHALATE SAID POLYALKYLENE TEREPHTHALATE HAVING AN INTRINSIC VISCOSITY IN THE RANGE OF BETWEEN ABOUT 0.4 AND 1.5 DECILITERS PER GRAM AS MEASURED IN AN 8 PERCENT SOLUTION BASED ON THE POLYMER WEIGHT OF ORTHO-CHLOROPHENOL AT 25*C, A REINFORCING FILLER AND A POLYAMIDE PRESENT IN A CONCENTRATION OF MORE THAN 0.25 PERCENT BY WEIGHT AND LESS THAN 1 PERCENT BY WEIGHT BASED ON THE TOTAL WEIGHT OF THE COMPOSITION SAID POLYAMIDE SELECTED FROM THE GROUP CONSISTING OF POLYCAPROLACTAM THE POLYCONDENSATION PRODUCT OF HEXAMEYLENE DIAMINE AND SEBACIC ACID AND THE POLYCONDENSATION PRODUCT OF HEXAMETHYLENE DIAMINE AND DODECANOIC ACID.
Claim 2
Dependent Claim
116 words
A STABILIZED POLYALKYLENE TEREPHTHALATE RESIN COMPOSITION COMPRISING: A POLYALKYLENE TEREPHTHALATE SELECTED FROM THE GROUP CONSISTING OF POLYPROPYLENE TEREPHTHALATE AND POLYBUTYLENE TEREPHTHALATE SAID POLYALKYLENE TEREPHTHALATE HAVING AN INTRINSIC VISCOSITY IN THE RANGE OF BETWEEN ABOUT 0.4 AND 1.5 DECILITERS PER GRAM AS MEASURED IN AN 8 PERCENT SOLUTION BASED ON THE POLYMER WEIGHT OF ORTHO-CHLOROPHENOL AT 25*C, A REINFORCING FILLER AND A POLYAMIDE PRESENT IN A CONCENTRATION OF MORE THAN 0.25 PERCENT BY WEIGHT AND LESS THAN 1 PERCENT BY WEIGHT BASED ON THE TOTAL WEIGHT OF THE COMPOSITION SAID POLYAMIDE SELECTED FROM THE GROUP CONSISTING OF POLYCAPROLACTAM THE POLYCONDENSATION PRODUCT OF HEXAMEYLENE DIAMINE AND SEBACIC ACID AND THE POLYCONDENSATION PRODUCT OF HEXAMETHYLENE DIAMINE AND DODECANOIC ACID.
Claim 3
Dependent Claim
12 words
A composition in accordance with claim 1 wherein said polyamide is polycaprolactam.
Claim 4
Dependent Claim
20 words
A composition in accordance with claim 1 wherein said polyamide is the polycondensation product of hexamethylene diamine and sebacic acid.
Claim 5
Dependent Claim
20 words
A composition in accordance with claim 1 wherein said polyamide is the polycondensation product of hexamethylene diamine and dodecanoic acid.
Claim 6
Dependent Claim
14 words
A composition in accordance with claim 1 wherein said reinforcing filler is glass fibers.
Claim 7
Dependent Claim
36 words
A composition in accordance with claim 5 wherein said glass fibers are present in a concentration in the range of between about 2 and 60 percent by weight, based on the total weight of the composition.
Claim 8
Dependent Claim
14 words
A composition in accordance with claim 1 wherein said polyalkylene terephthalate is polybutylene terephthalate.
Claim 9
Dependent Claim
18 words
A composition in accordance with claim 1 wherein said polyamides are introduced into said resin composition as pellets.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |