US4130548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyester carbonates from polyanhydride ester intermediates
Assignee: General Electric Co
•
Filing: 1977-10-21
•
Granted: 1978-12-19
•
Expires: 1997-10-21
Abstract
Abstract A novel process is disclosed for the preparation of polyester carbonates containing both carboxylate and carbonate groups. The process is based on the making of a mixed polyanhydride ester of a dibasic acid which is reacted with a dihydroxy compound to form a hydroxy containing intermediate that is subsequently transformed into a polyester carbonate by means of a carbonate forming reagent.
Inventors
- 👤 John E. Kochanowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:25
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/64
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
85 words
A process for the preparation of a copolyester containing both carboxylate and carbonate groups, said process comprising: (a) forming a polymeric mixed anhydride ester from by contacting a salt of a di carboxylic acid with a halogen acid ester of a polyhydroxy compound; (b) contacting said polymeric mixed anhydride ester with at least one molar equivalent of a dihydroxy compound; and (c) thereafter contacting the excess of the dihydroxy compound with a carbonate forming reagent to form the copolyester containing both carboxylate and carbonate groups.
Claim 2
Dependent Claim
85 words
A process for the preparation of a copolyester containing both carboxylate and carbonate groups, said process comprising: (a) forming a polymeric mixed anhydride ester from by contacting a salt of a di carboxylic acid with a halogen acid ester of a polyhydroxy compound; (b) contacting said polymeric mixed anhydride ester with at least one molar equivalent of a dihydroxy compound; and (c) thereafter contacting the excess of the dihydroxy compound with a carbonate forming reagent to form the copolyester containing both carboxylate and carbonate groups.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the carbonate forming reagent is phosgene.
Claim 4
Dependent Claim
25 words
The process of claim 1 wherein a minor amount of a branching agent having at least three ester forming groups is added to the reaction.
Claim 5
Dependent Claim
92 words
A process for the preparation of copolyesters containing both carboxylate and carbonate groups, said process comprising: (a) forming a polymeric mixed anhydride ester by contacting an alkali metal salt of a di carboxylic acid with a halogen carbonic acid ester of a polyhydroxy compound in the presence of an amine catalyst; (b) contacting said polymeric mixed anhydride ester with at least one molar equivalent of a dihydroxy compound; and (c) thereafter contacting the excess of the dihydroxy compound with a carbonyl halide to form the copolyester containing both carboxylate and carbonate groups.
Claim 6
Dependent Claim
92 words
A process for the preparation of copolyesters containing both carboxylate and carbonate groups, said process comprising: (a) forming a polymeric mixed anhydride ester by contacting an alkali metal salt of a di carboxylic acid with a halogen carbonic acid ester of a polyhydroxy compound in the presence of an amine catalyst; (b) contacting said polymeric mixed anhydride ester with at least one molar equivalent of a dihydroxy compound; and (c) thereafter contacting the excess of the dihydroxy compound with a carbonyl halide to form the copolyester containing both carboxylate and carbonate groups.
Claim 7
Dependent Claim
13 words
The process of claim 4 wherein the di carboxylic acid is adipic acid.
Claim 8
Dependent Claim
13 words
The process of claim 4 wherein the di carboxylic acid is isophthalic acid.
Claim 9
Dependent Claim
13 words
The process of claim 4 wherein the di carboxylic acid is terephthalic acid.
Claim 10
Dependent Claim
13 words
The process of claim 4 wherein the di carboxylic acid is azelaic acid.
Claim 11
Dependent Claim
13 words
The process of claim 4 wherein the di carboxylic acid is sebacic acid.
Claim 12
Dependent Claim
12 words
The process of claim 4 wherein the dihydroxy compound is 2,2-bis(4-hydroxyphenyl) propane.
Claim 13
Dependent Claim
12 words
The process of claim 4 wherein the dihydroxy compound is 4,4'-dihydroxydiphenyl ether.
Claim 14
Dependent Claim
12 words
The process of claim 4 wherein the dihydroxy compound is 4,4'-dihydroxydiphenyl sulfone.
Claim 15
Dependent Claim
11 words
The process of claim 4 wherein the dihydroxy compound is tetrabromobisphenol-A.
Claim 16
Dependent Claim
12 words
The process of claim 7 wherein the dihydroxy compound is 2,2-bis(4-hydroxyphenyl) propane.
Claim 17
Dependent Claim
86 words
A process for the preparation of a copolyester containing both carboxylic acid and carbonate groups, said process comprising: (a) forming a polymeric mixed anhydride ester by contacting isophthalic acid in the presence of a tertiary amine and sodium hydroxide; (b) contacting the polymeric mixed anhydride ester of step (a) with a molar excess of bisphenol-A in the presence of a tertiary amine and in an alkaline medium, (c) contacting the product of step (b) with phosgene to form the copolyester containing both carboxylate and carbonate groups.
Claim 18
Dependent Claim
86 words
A process for the preparation of a copolyester containing both carboxylic acid and carbonate groups, said process comprising: (a) forming a polymeric mixed anhydride ester by contacting isophthalic acid in the presence of a tertiary amine and sodium hydroxide; (b) contacting the polymeric mixed anhydride ester of step (a) with a molar excess of bisphenol-A in the presence of a tertiary amine and in an alkaline medium, (c) contacting the product of step (b) with phosgene to form the copolyester containing both carboxylate and carbonate groups.
Claim 19
Dependent Claim
16 words
The process of claim 15 wherein step (b) is carried out in the presence of triethylamine.
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) | 1981-12-18 | 1982-06-19 | 1982-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-18 | 1986-06-19 | 1986-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-18 | 1990-06-19 | 1990-12-19 | $7700.00 | Window Closed / Lapsed |