US4425470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkali metal salts of low molecular weight polyethylene terephthalate as nucleating agents for polyethylene terephthalates
Assignee: EIDP Inc
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Filing: 1982-08-06
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Granted: 1984-01-10
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Expires: 2002-08-06
Abstract
Abstract Alkali metal salts of ethylene terephthalate oligomers as nucleating agents for polyethylene terephthalate; (i) the nucleation process; (ii) a polyethylene terephthalate molding composition; and (iii) the product made by the nucleation process.
Inventors
- 👤 Dana S. Garcia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:58
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/91; C08G63/914; C08G63/916; C08L; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
108 words
A method for nucleating polyethylene terephthalate comprising melt-blending polyethylene terephthalate with a nucleating agent comprising an alkali metal salt of ethylene terephthalate oligomer, the method characterized by forming the nucleating agent outside of contact with the polyethylene terephthalate to be nucleated, wherein the nucleating agent has an inherent viscosity of at least about 0.1 dl/g, and a number-average molecular weight of at least about 1000, and wherein an individual molecule of the nucleating agent has the general formula M--OOC--C.sub.6 H.sub.4 --COOCH.sub.2 CH.sub.2 --.sub.n OOC--C.sub.6 H.sub.4 --X wherein M is an alkali metal, X is --COOM or --CH 2 CH 2 OH, and n is about 2 to 130.
Claim 2
Independent Claim
108 words
A method for nucleating polyethylene terephthalate comprising melt-blending polyethylene terephthalate with a nucleating agent comprising an alkali metal salt of ethylene terephthalate oligomer, the method characterized by forming the nucleating agent outside of contact with the polyethylene terephthalate to be nucleated, wherein the nucleating agent has an inherent viscosity of at least about 0.1 dl/g, and a number-average molecular weight of at least about 1000, and wherein an individual molecule of the nucleating agent has the general formula M--OOC--C.sub.6 H.sub.4 --COOCH.sub.2 CH.sub.2 --.sub.n OOC--C.sub.6 H.sub.4 --X wherein M is an alkali metal, X is --COOM or --CH 2 CH 2 OH, and n is about 2 to 130.
Claim 3
Dependent Claim
29 words
A method according to claim 1 wherein the nucleating agent is added in an amount of about 0.1 to 6 percent based on the total weight of the composition.
Claim 4
Dependent Claim
10 words
A method according to claim 1 wherein M is sodium.
Claim 5
Dependent Claim
19 words
A method according to claim 3 wherein the nucleating agent comprises at least about 0.5 weight percent of sodium.
Claim 6
Dependent Claim
39 words
A method according to claim 4 wherein the nucleating agent has a number average molecular weight of at least about 1,000 and the number average molecular weight of the polyethylene terephthalate to be nucleated is at least about 20,000.
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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) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |