US4081422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic molding compositions from terephthalic acid-butane-1,4-diol-but-2-ene-1,4-diol polyesters
Assignee: Keil Thompson and Shurtleff
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Filing: 1976-06-25
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Granted: 1978-03-28
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Expires: 1996-06-25
Abstract
Abstract A polyester which is manufactured by polycondensing terephthalic acid, or its lower alkyl esters, with butane-1,4-diol and at least 5 mole % of but-2-ene-1,4-diol, based on the amount of diol employed.
Inventors
- 👤 Claus Cordes
- 👤 Hans-Josef Sterzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:31
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C08K; C08K3/00; C08K5/00; C08K5/04; C08K5/13; C08K5/16; C08K5/29; C08K5/49; C08L; C08L101/00; C08L67/00; C08L67/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
63 words
Polyesters manufactured by polycondensing terephthalic acid or its lower alkyl esters with butane- 1,4-diol and from 10 to 80 mole % of but-2-ene-1,4-diol, based on the total amount of diol employed, and which have a relative viscosity of not less than 1.4, measured in 0.5% strength solution in a mixture of phenol and o-dichlorobenzene in a weight ratio of 3:2, at 25° C.
Claim 2
Dependent Claim
63 words
Polyesters manufactured by polycondensing terephthalic acid or its lower alkyl esters with butane- 1,4-diol and from 10 to 80 mole % of but-2-ene-1,4-diol, based on the total amount of diol employed, and which have a relative viscosity of not less than 1.4, measured in 0.5% strength solution in a mixture of phenol and o-dichlorobenzene in a weight ratio of 3:2, at 25° C.
Claim 3
Dependent Claim
21 words
Polyesters as set forth in claim 1, which are obtained by polycondensation at below 240° C and preferably below 230° C.
Claim 4
Dependent Claim
19 words
Thermoplastic molding compositions, which consist of a mixture of polyesters as set forth in claim 1 and other polymers.
Claim 5
Dependent Claim
36 words
Thermoplastic molding compositions, which consist of a mixture of polymers as set forth in claim 1 with up to 20%, based on the total composition, of polymers which have a glass transition temperature below 20° C.
Claim 6
Dependent Claim
29 words
Thermoplastic molding compositions as set forth in claim 1, which contain up to 50% by weight of fillers or reinforcing fibers having a diameter of less than 20 μ.
Claim 7
Dependent Claim
32 words
Thermoplastic molding compositions as set forth in claim 1, which contain, as stabilizers, from 0.05 to 5% by weight of a phosphorus compound and/or of sterically hindered phenols and/or carbodiimides or polycarbodiimides.
Claim 8
Dependent Claim
34 words
Thermoplastic molding compositions as set forth in claim 1, which contain up to 1% by weight of a finely divided additive of particle size less than 100 μ, preferably talc, as a crystallization accelerator.
Claim 9
Dependent Claim
24 words
Thermoplastic molding compositions as set forth in claim 1, wherein the molar ratio of terephthalic acid to diol mixture is from 1:1.2 to 1:2.
References Cited (Backward Citations)
US2435429A
Cited
US3838106A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-27 | 1981-09-26 | 1982-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-27 | 1985-09-26 | 1986-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-27 | 1989-09-26 | 1990-03-28 | $7700.00 | Window Closed / Lapsed |