Patent US4444931A successfully refreshed from Google Patents.
US4444931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester blends
Assignee: Celanese Corp
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Filing: 1982-07-07
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Granted: 1984-04-24
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Expires: 2002-07-07
Abstract
Abstract Nucleating agents have been discovered which enable molded articles to be prepared with smooth glossy surfaces from blends of polyethylene terephthalate and polybutylene terephthalate in the "wet state", i.e., without the resin having been subjected to a predrying stage. The present invention is directed to polyalkylene terephthalate resin compositions. Specifically, it is directed to undried blends of polyethylene terephthalate and polybutylene terephthalate resins with nucleating agents which enable these resin blends to be molded into articles with smooth glossy surfaces. In a preferred embodiment fillers and/or reinforcing materials are added without subjecting the resin to a predrying treatment which has been heretofore necessary in the prior art.
Inventors
- 👤 Shau-Zou Lu
- 👤 Melvin Druin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:28
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02; C08K; C08K3/00; C08K3/18; C08K3/24; C08K3/26; Y; Y10; Y10S; Y10S260/00; Y10S260/24; Y10S260/35
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
66 words
A thermoplastic polyester molding composition, comprising an intimate admixture of: (a) a blend of polyethylene terephthalate and polybutylene terephthalate in a weight ratio of from about 1:1 to about 9:1, respectively; and (b) from about 0.1 to about 20% by weight of the total composition of a nucleating agent selected from the group consisting of sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, and mixtures thereof.
Claim 2
Dependent Claim
66 words
A thermoplastic polyester molding composition, comprising an intimate admixture of: (a) a blend of polyethylene terephthalate and polybutylene terephthalate in a weight ratio of from about 1:1 to about 9:1, respectively; and (b) from about 0.1 to about 20% by weight of the total composition of a nucleating agent selected from the group consisting of sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, and mixtures thereof.
Claim 3
Dependent Claim
22 words
The composition of claim 1, wherein said nucleating agent comprises from about 0.2 to about 10% by weight of the total composition.
Claim 4
Dependent Claim
22 words
The composition of claim 2, wherein said nucleating agent comprises from about 0.3 to about 5% by weight of the total composition.
Claim 5
Dependent Claim
26 words
The composition of any one of claims 1-3, wherein said composition further comprises from about 0.05 to about 10% by weight of a mold release agent.
Claim 6
Dependent Claim
12 words
The composition of claim 4, wherein said mold release agent is N,N'-distearoylethylenediamine.
Claim 7
Dependent Claim
32 words
The composition of any one of claims 1-3, wherein said composition further comprises a plasticizer in an amount of from about 0.1 to about 20 percent by weight of the total composition.
Claim 8
Dependent Claim
35 words
The composition of any one of claims 1-3, wherein said composition further comprises a flame retardant additive in a minor proportion but in an amount at least sufficient to render said composition non-burning or self-extinguishing.
Claim 9
Dependent Claim
43 words
The composition of any one of claims 1-3, wherein said composition further comprises a polytetrafluoroethylene resin or a fumed colloidal silica in a minor proportion based on said composition, but in an amount at least sufficient to render said composition non-dripping when burning.
Claim 10
Dependent Claim
64 words
The composition of any one of claims 1-3, wherein said composition further contains an additive selected from the group consisting of reinforcing agents, mineral fillers and mixtures thereof in an amount of from about 4 to about 65% by weight of the total composition, said blend of polyethylene terephthalate and polybutylene terephthalate comprising from about 40 to about 95% by weight of the composition.
Claim 11
Dependent Claim
11 words
The composition of claim 9, wherein said additive is glass fiber.
Claim 12
Dependent Claim
118 words
A thermoplastic polyester molding composition, comprising an intimate admixture of: (a) a blend of polyethylene terephthalate and polybutylene terephthalate in a weight ratio of from about 1:1 to about 9:1, respectively; (b) from about 0.1 to about 20% by weight of the total composition of a nucleating agent selected from the group consisting of potassium carbonate, potassium bicarbonate, sodium carbonate, sodium bicarbonate, and mixtures thereof; (c) a flame retardant additive in a minor amount but in an amount at least sufficient to render said composition non-burning or self-extinguishing; and (d) a polytetrafluoroethylene resin or a fumed colloidal silica drip suppressant in a minor proportion but in an amount at least sufficient to render said composition non-dripping when burning.
Claim 13
Dependent Claim
118 words
A thermoplastic polyester molding composition, comprising an intimate admixture of: (a) a blend of polyethylene terephthalate and polybutylene terephthalate in a weight ratio of from about 1:1 to about 9:1, respectively; (b) from about 0.1 to about 20% by weight of the total composition of a nucleating agent selected from the group consisting of potassium carbonate, potassium bicarbonate, sodium carbonate, sodium bicarbonate, and mixtures thereof; (c) a flame retardant additive in a minor amount but in an amount at least sufficient to render said composition non-burning or self-extinguishing; and (d) a polytetrafluoroethylene resin or a fumed colloidal silica drip suppressant in a minor proportion but in an amount at least sufficient to render said composition non-dripping when burning.
Claim 14
Dependent Claim
22 words
The composition of claim 11, wherein said nucleating agent comprises from about 0.2 to about 10% by weight of the total composition.
Claim 15
Dependent Claim
22 words
The composition of claim 11, wherein said nucleating agent comprises from about 0.3 to about 5% by weight of the total composition.
Claim 16
Dependent Claim
23 words
The composition of any one of claims 11-13, further comprising from about 0.05 to about 10% by weight of a mold release agent.
References Cited (Backward Citations)
US2465319A
Cited
US3047539A
Cited
US3565852A
Cited
US3629366A
Cited
US3547872A
Cited
US3578623A
Cited
US3673144A
Cited
US3624041A
Cited
US3673139A
Cited
US3843615A
Cited
US3953394B1
Cited
US3953394A
Cited
US4016112A
Cited
US3965064A
Cited
US3889039A
Cited
US4028289A
Cited
US4113692A
Cited
US4122047A
Cited
GB2015014A
Cited
US4215032A
Cited
US4172824A
Cited
US4220735A
Cited
US4212791A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-24 | 1987-10-24 | 1988-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-24 | 1991-10-24 | 1992-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-24 | 1995-10-24 | 1996-04-24 | $7700.00 | Window Closed / Lapsed |