US4093595A
Expired / Lapsed
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Process for preparing polyesters from diphenols and aromatic dicarboxylic acids by direct polymerization
Assignee: EIDP Inc
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Filing: 1976-11-19
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Granted: 1978-06-06
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Expires: 1996-11-19
Abstract
Abstract A catalytic procedure is provided for the preparation of polyesters from (1) dihydric phenols and (2) aromatic dicarboxylic acids by direct polymerization.
Inventors
- 👤 Steven P. Elliott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:19
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/19; C08G63/66; C08G63/668; C08G63/672; C08G63/78; C08G63/82; C08G63/85
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
58 words
A direct polymerization process comprising reacting a composition consisting essentially of at, least one aromatic dicarboxylic acid and at least one dihydric phenol in the presence of a catalytic amount of a compound selected from the group consisting of antimony, tin, and titanium compounds and at a temperature sufficient to maintain the resulting polyester in a molten state.
Claim 2
Dependent Claim
58 words
A direct polymerization process comprising reacting a composition consisting essentially of at, least one aromatic dicarboxylic acid and at least one dihydric phenol in the presence of a catalytic amount of a compound selected from the group consisting of antimony, tin, and titanium compounds and at a temperature sufficient to maintain the resulting polyester in a molten state.
Claim 3
Dependent Claim
30 words
The process of claim 1 wherein the catalyst is present in an amount of at least 0.01 mole % based on the total moles of dicarboxylic acid that are employed.
Claim 4
Dependent Claim
29 words
The process of claim 1 wherein the catalyst is present in an amount of from 0.1 to 1% based on the total moles of dicarboxylic acid that are employed.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the catalyst is a metallo-organic compound.
Claim 6
Dependent Claim
11 words
The process of claim 4 wherein the catalyst is n-butylstannoic acid.
Claim 7
Dependent Claim
16 words
The process of claim 1 wherein two aromatic dicarboxylic acids are reacted with a dihydric phenol.
Claim 8
Dependent Claim
13 words
The process of claim 6 wherein the acids are 2,6-naphthalic and terephthalic acids.
Claim 9
Dependent Claim
13 words
The process of claim 6 wherein the acids are isophthalic and terephthalic acids.
Claim 10
Dependent Claim
14 words
The process of claim 1 wherein two dihydric phenols are reacted with terephthalic acid.
Claim 11
Dependent Claim
13 words
The process of claim 9 wherein the dihydric phenols are 2,6-dimethylhydroquinone and 3,3'5,5'-tetramethyl-4,4'-biphenol.
Claim 12
Dependent Claim
13 words
The process of claim 9 wherein the dihydric phenols are methylhydroquinone and bis(4-hydroxyphenyl)ether.
Claim 13
Dependent Claim
16 words
The process of claim 1 wherein one aromatic dicarboxylic acid is reacted with one dihydric phenol.
Claim 14
Dependent Claim
12 words
The process of claim 12 wherein terephthalic acid is reacted with phenylhydroquinone.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-05 | 1981-12-05 | 1982-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-05 | 1985-12-05 | 1986-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-05 | 1989-12-05 | 1990-06-06 | $7700.00 | Window Closed / Lapsed |