Patent US4066617A successfully refreshed from Google Patents.
US4066617A
Expired / Lapsed
US
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Stabilized poly(alkylene terephthalates)
Assignee: Bayer Corp
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Filing: 1976-08-23
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Granted: 1978-01-03
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Expires: 1996-08-23
Abstract
Abstract Poly(alkylene terephthalates) are stabilized during high temperature processing by neutral esters of phosphorous acid having at least one oxetane group. The stabilized poly(alkylene terephthalates) are resistant to molecular weight degradation and discoloration during melt processing of the polymer when the polymer is being extruded and formed into molded articles.
Inventors
- 👤 Herbert L. Rawlings
- 👤 Arthur L. Baron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:00
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/529
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
26 words
A stabilized polymeric molding material comprising: a poly(alkylene terephthalate); and, a stabilizing amount of a neutral ester of phosphorous acid with at least one oxetane group.
Claim 2
Dependent Claim
26 words
A stabilized polymeric molding material comprising: a poly(alkylene terephthalate); and, a stabilizing amount of a neutral ester of phosphorous acid with at least one oxetane group.
Claim 3
Dependent Claim
12 words
The material of claim 1 wherein said poly(alkylene terephthalate) is poly(butylene terephthalate).
Claim 4
Dependent Claim
17 words
The material of claim 2 wherein said poly(butylene terephthalate) has an intrinsic viscosity of 0.6 to 1.5
Claim 5
Dependent Claim
17 words
The material of claim 3 wherein said poly(butylene terephthalate) has an intrinsic viscosity of 0.75 to 1.3.
Claim 6
Dependent Claim
65 words
The material of claim 2 wherein said ester of phosphorous acid is represented by the structural formula: ##STR7## where n is 0 or 1, R 1 is selected from the group consisting of alkyl, aryl, aralkyl, halomethyl, cyanomethyl, alkoxymethyl, aryloxymethyl, aralkyloxymethyl and acyloxymethyl, and R 2 , R 3 and R 4 are selected from the group consisting of ##STR8## alkyl, aryl, aralkyl and haloaryl.
Claim 7
Dependent Claim
23 words
The material of claim 5 wherein said ester of phosphorous acid is tris(3-ethyl-3-methyl oxetane) phosphite and is represented by the structural formula: ##STR9##
Claim 8
Dependent Claim
31 words
The material of claim 1 wherein said ester of phosphorous acid is present at a level of 0.0013 to 0.0168% by weight based on the weight of phosphorus in said material.
Claim 9
Dependent Claim
12 words
The material of claim 1 wherein said poly(alkylene terephthalate) is poly(ethylene terephthalate).
Claim 10
Dependent Claim
17 words
The material of claim 8 wherein said poly(ethylene terephthalate) has an intrinsic viscosity of 0.6 to 0.9.
Claim 11
Dependent Claim
65 words
The material of claim 8 wherein said ester of phosphorous acid is represented by the structural formula: ##STR10## where n is 0 or 1, R 1 is selected from the group consisting of alkyl, aryl, aralkyl, halomethyl, cyanomethyl, alkoxymethyl, aryloxymethyl, aralkyloxymethyl and acyloxymethyl and R 2 , R 3 and R 4 are selected from the group consisting of ##STR11## alkyl, aryl, aralkyl and haloaryl.
Claim 12
Dependent Claim
23 words
The material of claim 10 wherein said ester of phosphorous acid is tris(3-ethyl-3-methyl oxetane) phosphite and is represented by the structural formula: ##STR12##
Claim 13
Dependent Claim
38 words
In a poly(alkylene terephthalate) based polymer capable of being thermoplastically molded, the improvement comprising: a stabilizing amount of a neutral ester of phosphorous acid with at least one oxetane group being in admixture with said poly(alkylene terephthalate) polymer.
Claim 14
Dependent Claim
38 words
In a poly(alkylene terephthalate) based polymer capable of being thermoplastically molded, the improvement comprising: a stabilizing amount of a neutral ester of phosphorous acid with at least one oxetane group being in admixture with said poly(alkylene terephthalate) polymer.
Claim 15
Dependent Claim
28 words
The poly(alkylene terephthalate) based polymer of claim 12 wherein said phosphorous acid ester is present from 0.015 to 0.2% by weight based on the weight of said polymer.
Claim 16
Dependent Claim
18 words
The poly(alkylene terephthalate) of claim 12 wherein said phosphorous acid ester is represented by the structural formula: ##STR13##
References Cited (Backward Citations)
US2437232A
Cited
US3398212A
Cited
US3305520A
Cited
US3489716A
Cited
US3516957A
Cited
US3794629A
Cited
US3886104A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |