US4391938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethylene terephthalate compositions having improved crystallization rate and surface appearance
Assignee: Rohm and Haas Co
•
Filing: 1982-02-16
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Granted: 1983-07-05
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Expires: 2002-02-16
Abstract
Abstract Compositions comprising polyethylene terephthalate and an additive to promote crystallization rate and improve surface appearance selected from the group consisting of monomeric esters of citric acid and epoxidized esters of unsaturated aliphatic carboxylic acids. Compositions comprising polyethylene terephthalate, poly (C 4 -C 6 ) terephthalate, and a surface appearance and crystallization rate improving additive selected from the group consisting of monomeric esters of citric acid, organic esters of an aromatic carboxylic acid of 7 to 11 carbon atoms containing at least one carboxyl group per aromatic nucleus and an alcohol, oligomeric polyesters, and epoxidized esters of unsaturated aliphatic carboxylic acids.
Inventors
- 👤 Nazir A. Memon
- 👤 Cielo S. Myers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:49
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/11; C08K5/15; C08K5/151; C08K5/1515
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
56 words
Composition comprising polyethylene terephthalate and from about 1 to about 10% by weight of an additive, based on polyethylene terephthalate and additive, said additive being present to promote crystallization rate and improve surface appearance, said additive being selected from the group consisting of monomeric esters of citric acid and epoxidized esters of unsaturated aliphatic carboxylic acids.
Claim 2
Dependent Claim
56 words
Composition comprising polyethylene terephthalate and from about 1 to about 10% by weight of an additive, based on polyethylene terephthalate and additive, said additive being present to promote crystallization rate and improve surface appearance, said additive being selected from the group consisting of monomeric esters of citric acid and epoxidized esters of unsaturated aliphatic carboxylic acids.
Claim 3
Dependent Claim
12 words
Composition of claim 1 wherein said additive is epoxidized tall oil esters.
Claim 4
Dependent Claim
19 words
Composition of claim 1 wherein said additive is acetylated butyl citrate or acetylated octyl, decyl citrate or mixtures thereof.
Claim 5
Dependent Claim
95 words
Composition comprising polyethylene terephthalate, poly (C 4 -C 6 ) terephthalate, and a surface appearance and crystallization rate improving additive in an amount of from about 1 to about 15% of said additive based on polyethylene terephthalate, poly (C 4 -C 6 ) terephthalate, and additive, said additive being selected from the group consisting of monomeric esters of citric acid, organic esters of an aromatic carboxylic acid of 7 to 11 carbon atoms containing at least one carboxyl group per aromatic nucleus and an alcohol, oligomeric polyesters, and epoxidized esters of unsaturated aliphatic carboxylic acids.
Claim 6
Dependent Claim
95 words
Composition comprising polyethylene terephthalate, poly (C 4 -C 6 ) terephthalate, and a surface appearance and crystallization rate improving additive in an amount of from about 1 to about 15% of said additive based on polyethylene terephthalate, poly (C 4 -C 6 ) terephthalate, and additive, said additive being selected from the group consisting of monomeric esters of citric acid, organic esters of an aromatic carboxylic acid of 7 to 11 carbon atoms containing at least one carboxyl group per aromatic nucleus and an alcohol, oligomeric polyesters, and epoxidized esters of unsaturated aliphatic carboxylic acids.
Claim 7
Dependent Claim
31 words
Composition of claim 4 wherein the weight ratio of poly(C 4 -C 6 ) terephthalate to poly (C 4 -C 6 ) terephthalate and polyethylene terephthalate is about 0.05 to 0.50.
Claim 8
Dependent Claim
12 words
Composition of claim 4 wherein said additive is epoxidized tall oil esters.
Claim 9
Dependent Claim
16 words
Composition of claim 4 wherein said additive is acetylated butyl citrate or acetylated octyl, decyl citrate.
Claim 10
Dependent Claim
40 words
Composition of claim 4 wherein said additive is epoxidized tall oil esters and the weight ratio of poly (C 4 -C 6 ) terephthalate to poly (C 4 -C 6 ) terephthalate and polyethylene terephthalate is about 0.05 to 0.50.
Claim 11
Dependent Claim
8 words
Composition of claim 4 further including flame retardant.
Claim 12
Dependent Claim
8 words
Composition of claim 4 further including glass reinforcement.
Claim 13
Dependent Claim
17 words
Composition of claim 4 further including reinforcing filler material selected from mica, wollastonite, and reprecipitated calcium carbonate.
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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) | 1986-07-04 | 1987-01-03 | 1987-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-04 | 1991-01-03 | 1991-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-04 | 1995-01-03 | 1995-07-05 | $7700.00 | Window Closed / Lapsed |