Patent US5496910A successfully refreshed from Google Patents.
US5496910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydroxyfunctional thermoplastic polyesters
Assignee: Dow Chemical Co
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Filing: 1994-07-21
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Granted: 1996-03-05
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Expires: 2014-07-21
Abstract
Abstract A biodegradable hydroxy-functional polyester is prepared by contacting a hydroxy-functional aliphatic dicarboxylic acid or a mixture of dicarboxylic acids containing hydroxy-functional aliphatic diacids, with a diglycidyl ether or diglycidyl ester in the presence of an onium catalyst in an ether solvent under conditions suitable for forming the polyester.
Inventors
- 👤 Michael N. Mang
- 👤 Jerry E. White
- 👤 Paul E. Swanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:20
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/40; C08G63/42; C08G59/00; C08G59/18; C08G59/40; C08G59/62; C08G59/625; C08G63/60
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
90 words
A thermoplastic polyester having repeating units represented by the formula: ##STR7## wherein R 1 is a hydrocarbylene substituted with at least one hydroxyl group, optionally in combination with an unsubstituted aromatic moiety or an unsubstituted hydrocarbylene; R 3 is ##STR8## and R 4 is ##STR9## wherein R 2 is independently a divalent aromatic moiety or a hydrocarbylene; R 5 is independently hydrogen or lower alkyl; R 6 is a divalent aromatic moiety, or a hydrocarbylene optionally substituted with at least one hydroxyl group; and n is from 0 to 10.
Claim 2
Dependent Claim
90 words
A thermoplastic polyester having repeating units represented by the formula: ##STR7## wherein R 1 is a hydrocarbylene substituted with at least one hydroxyl group, optionally in combination with an unsubstituted aromatic moiety or an unsubstituted hydrocarbylene; R 3 is ##STR8## and R 4 is ##STR9## wherein R 2 is independently a divalent aromatic moiety or a hydrocarbylene; R 5 is independently hydrogen or lower alkyl; R 6 is a divalent aromatic moiety, or a hydrocarbylene optionally substituted with at least one hydroxyl group; and n is from 0 to 10.
Claim 3
Dependent Claim
53 words
The polyester of claim 1 wherein R 1 is independently (1) alkylene, cycloalkylene, alkenylene, alkyleneoxyalkylene, alkylenethioalkylene or alkylenesulfonylalkylene, substituted with at least one hydroxyl group and, optionally, combined with (2) arylene, alkylenearylene, dialkylenearylene, diaryleneketone, diarylenesulfone, diarylenesulfoxide, alkylidene-diarylene, diarylene oxide or diarylene sulfide; or another alkylene, cycloalkylene, or alkenylene, alkenylene, alkyleneoxyalkylene, alkylenethioalkylene or alkylenesulfonylalkylene.
Claim 4
Dependent Claim
22 words
The polyester of claim 1 wherein R 1 is independently hydroxymethylene, hydroxyethylene, dihydroxyethylene, hydroxypropylene, dihydroxypropylene, trihydroxypropylene, hydroxymethylethylene, hydroxybutylene, dihydroxybutylene, trihydroxybutylene, or tetrahydroxybutylene.
Claim 5
Dependent Claim
12 words
The polyester of claim 3 wherein R 1 is hydroxyethylene or dihydroxyethylene.
Claim 6
Dependent Claim
31 words
The polyester of claim 1 wherein R 2 is independently (1) arylene, alkylenearylene, dialkylenearylene, diaryleneketone, diarylenesulfone, diarylenesulfoxide, alkylidene-diarylene, diarylene oxide, diarylene sulfide, or (2) alkylene, cycloalkylene alkenylene, alkyleneoxyalkylene, alkylenethioalkylene, or alkylenesulfonylalkylene.
Claim 7
Dependent Claim
21 words
The polyester of claim 1 wherein R 2 is independently m-phenylene, p-phenylene, naphthylene, diphenylene-isopropylideneethylene, propylene, butylene, hexylene, octylene, decylene, or cyclohexylene.
Claim 8
Dependent Claim
38 words
The polyester of claim 1 wherein R 6 is (1) arylene, alkylenearylene, dialkylenearylene, diaryleneketone, diarylenesulfone, diarylenesulfoxide, alkylidene-diarylene, diarylene oxide, diarylene sulfide, or (2) alkylene, cycloalkylene, alkenylene, alkyleneoxyalkylene, alkylenethioalkylene, or alkylenesulfonylalkylene, optionally substituted with at least one hydroxyl group.
Claim 9
Dependent Claim
31 words
The polyester of claim 1 wherein R 6 is m-phenylene, p-phenylene, naphthylene, diphenylene-isopropylidene, ethylene, propylene, butylene, hexylene, octylene, decylene, cyclohexylene, hydroxyethylene, dihydroxyethylene, hydroxypropylene, dihydroxypropylene, trihydroxypropylene, hydroxymethylethylene, hydroxybutylene, dihydroxybutylene, trihydroxybutylene, or tetrahydroxybutylene.
Claim 10
Dependent Claim
10 words
The polyester of claim 1 wherein R 5 is hydrogen.
Claim 11
Dependent Claim
13 words
The polyester of claim 1 wherein n is from about 0 to 1000.
Claim 12
Dependent Claim
13 words
The polyester of claim 1 wherein n is from about 0 to 10.
Claim 13
Dependent Claim
33 words
The polyester of claim 1 prepared by reacting a hydroxy-functional aliphatic dicarboxylic acid, optionally in combination with another diacid, with a diglycidyl ether or diglycidyl ester, in the presence of an onium catalyst.
Claim 14
Dependent Claim
20 words
The polyester of claim 1 prepared by reacting bisphenol A diglycidyl ether and a mixture of isophthalic and tartaric acids.
Claim 15
Dependent Claim
25 words
The polyester of claim 2 prepared by reacting bisphenol A diglycidyl ether and a 1:1 to 9:1 molar ratio mixture of isophthalic and tartaric acids.
Claim 16
Dependent Claim
19 words
The polyester of claim 1 in the form of a biodegradable molded or foamed article, container, film or coating.
References Cited (Backward Citations)
US3305528A
Cited
US3850862A
Cited
US4128515A
Cited
US5143998A
Cited
US5115075A
Cited
JPH04124764A
Cited
US5089588A
Cited
US5171820A
Cited
US5134218A
Cited
US5149768A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-03-05 | 1999-09-04 | 2000-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-05 | 2003-09-04 | 2004-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-05 | 2007-09-04 | 2008-03-05 | $7700.00 | Window Closed / Lapsed |