US5821286A
Expired / Lapsed
US
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Biodegradable polyester and natural polymer compositions and films therefrom
Assignee: Biotechnology Research and Development Corp
•
Filing: 1996-05-24
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Granted: 1998-10-13
•
Expires: 2016-05-24
Abstract
Abstract Biodegradable films include two biodegradable components. One component preferably is starch while the other component is a water insoluble, synthetic polymer, preferably a hydroxy-functional polyester.
Inventors
- 👤 Wayne Xu
- 👤 William M. Doane
- 👤 John W. Lawton, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:11
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08L; C08L3/00; C08L3/02; C08L67/00; C08J2303/00; C08J2303/02; C08J2367/00; C08L2201/00; C08L2201/06; C08L29/00; C08L29/02; C08L29/04
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
98 words
A composition, useful in forming moisture resistant biodegradable articles, comprising: an admixture, the admixture having as the minor component a gelatinized starch and having at least about 10 wt. % to about 70 wt. % of a hydroxy-functional polyester therein, wherein the hydroxy-functional polyester has repeating units represented by Formula B: ##STR6## where each of R 1 and R 2 is individually a divalent organic moiety which is predominately hydrocarbon, each R 3 is individually hydrogen or lower alkyl, y is a fraction from 0 to 0.5, and x is a fraction from about 0.05 to about 0.4.
Claim 2
Dependent Claim
98 words
A composition, useful in forming moisture resistant biodegradable articles, comprising: an admixture, the admixture having as the minor component a gelatinized starch and having at least about 10 wt. % to about 70 wt. % of a hydroxy-functional polyester therein, wherein the hydroxy-functional polyester has repeating units represented by Formula B: ##STR6## where each of R 1 and R 2 is individually a divalent organic moiety which is predominately hydrocarbon, each R 3 is individually hydrogen or lower alkyl, y is a fraction from 0 to 0.5, and x is a fraction from about 0.05 to about 0.4.
Claim 3
Dependent Claim
11 words
The composition as in claim 1 wherein the admixture is molten.
Claim 4
Dependent Claim
23 words
The composition as in claim 1 wherein the admixture optionally includes from about 0 wt. % to about 40 wt. % poly(vinyl alcohol).
Claim 5
Dependent Claim
10 words
The composition as in claim 1 further comprising a plasticizer.
Claim 6
Dependent Claim
18 words
The composition as in claim 1 wherein the polyester includes a repeating structure shown by Formula C: ##STR7##
Claim 7
Dependent Claim
18 words
The composition as in claim 1 wherein the polyester includes a repeating structure shown by Formula D: ##STR8##
Claim 8
Dependent Claim
18 words
The composition as in claim 1 wherein the polyester includes a repeating structure shown by Formula E: ##STR9##
Claim 9
Dependent Claim
18 words
The composition as in claim 1 wherein the polyester includes a repeating structure shown by Formula F: ##STR10##
Claim 10
Dependent Claim
146 words
A biodegradable film comprising: a gelatinized starch as a minor component of the total; and a synthetic polymer, the synthetic polymer being a hydroxy-functional polyester in an amount of the total film of from about 10 wt. % to about 70 wt. %, the film defining a surface, the surface being substantially entirely formed by synthetic polymers wherein the synthetic polymer includes repeating units represented by Formula B: ##STR11## where each of R 1 and R 2 is individually a divalent organic moiety, each R 3 is individually hydrogen or methyl, y is a fraction from 0 to 0.5, and x is a fraction from 0.05 to about 0.4, and wherein each of R 1 and R 2 is: (a) arylene, alkylenearylene, dialkylenearylene, diaryleneketone, diarylenesulfone, diarylenesulfoxide, alkylenecarbonylarylene, alkylenesulfonylarylene, alkylidenediarylene, diarylene oxide, alkyleneoxyarylene, alkylenethioarylene, diarylene sulfide, or diarylenecyanomethane; or (b) alkylene, dialkyleneketone, dialkylenesulfone, dialkylenesulfoxide, dialkyleneoxide, or dialkylenesulfide.
Claim 11
Dependent Claim
146 words
A biodegradable film comprising: a gelatinized starch as a minor component of the total; and a synthetic polymer, the synthetic polymer being a hydroxy-functional polyester in an amount of the total film of from about 10 wt. % to about 70 wt. %, the film defining a surface, the surface being substantially entirely formed by synthetic polymers wherein the synthetic polymer includes repeating units represented by Formula B: ##STR11## where each of R 1 and R 2 is individually a divalent organic moiety, each R 3 is individually hydrogen or methyl, y is a fraction from 0 to 0.5, and x is a fraction from 0.05 to about 0.4, and wherein each of R 1 and R 2 is: (a) arylene, alkylenearylene, dialkylenearylene, diaryleneketone, diarylenesulfone, diarylenesulfoxide, alkylenecarbonylarylene, alkylenesulfonylarylene, alkylidenediarylene, diarylene oxide, alkyleneoxyarylene, alkylenethioarylene, diarylene sulfide, or diarylenecyanomethane; or (b) alkylene, dialkyleneketone, dialkylenesulfone, dialkylenesulfoxide, dialkyleneoxide, or dialkylenesulfide.
Claim 12
Dependent Claim
12 words
The film as in claim 9 further comprising a vinyl alcohol copolymer.
Claim 13
Dependent Claim
13 words
The film as in claim 9 wherein the surface is substantially liquid resistant.
Claim 14
Dependent Claim
13 words
The film as in claim 10 wherein the vinyl alcohol is poly(vinyl alcohol).
Claim 15
Dependent Claim
25 words
The film as in claim 12 wherein the poly(vinyl alcohol) is in an amount of up to about 40 wt. % of the total film.
Claim 16
Dependent Claim
10 words
The film as in claim 9 further including a plasticizer.
Claim 17
Dependent Claim
48 words
The film as in claim 9 wherein each of R 1 and R 2 is individually a divalent aromatic moiety selected from the group consisting of m-phenylene, p-phenylene, isopropylidene, diphenylene, biphenylene, biphenylene oxide, methylenediphenylene, biphenylene sulfide, naphthylene, biphenylenecyanomethane, 3,3'-dialkyldiphenylene-isopropylidene, 3,3',4,4'-tetralkyldiphenylene-isopropylidene, and similar alkyl-substituted derivatives of such aromatic moieties.
Claim 18
Dependent Claim
30 words
The film as in claim 9 wherein each of R 1 and R 2 is individually a divalent aliphatic moiety selected from the group consisting of ethylene, propylene, and butylene.
Claim 19
Dependent Claim
14 words
The composition as claim 1 wherein each R 3 is individually hydrogen or methyl.
Claim 20
Dependent Claim
42 words
The composition as in claim 17 wherein each of R 1 and R 2 is a divalent aromatic moiety, an aliphatic hydrocarbon divalent moiety, or an aliphatic heteroatomic moiety wherein the heteroatomic moiety is oxygen, sulfur, imino, sulfonyl, carboxyl, carbonyl, or sulfoxyl.
References Cited (Backward Citations)
US3149085A
Cited
US4016117A
Cited
US3850862A
Cited
US3901838A
Cited
US3921333A
Cited
US3923729A
Cited
US3931068A
Cited
US3932319A
Cited
US3949145A
Cited
US4344857A
Cited
US4483950A
Cited
US4873270A
Cited
US4983651A
Cited
US4911952A
Cited
US5095054A
Cited
US4863655A
Cited
US5360830A
Cited
WO1993001043A1
Cited
US5219646A
Cited
US5183690A
Cited
US5234977A
Cited
WO1992002363A1
Cited
US5439953A
Cited
US5292782A
Cited
US5186990A
Cited
US5412005A
Cited
US5171820A
Cited
EP0513679A2
Cited
US5384187A
Cited
US5346936A
Cited
US5422387A
Cited
WO1993000399A1
Cited
US5256711A
Cited
EP0535994A1
Cited
US5252271A
Cited
WO1993011937A1
Cited
US5185382A
Cited
WO1993014911A1
Cited
US5510401A
Cited
US5321064A
Cited
US5446078A
Cited
JPH05320326A
Cited
US5391423A
Cited
US5272181A
Cited
US5462983A
Cited
EP0667369A1
Cited
US5459258A
Cited
DE4411051A1
Cited
WO1996003454A1
Cited
US5496910A
Cited
US5574076A
Cited
US5583187A
Cited
FR2735483A1
Cited
WO1997023564A1
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2001-10-12 | 2002-04-13 | 2002-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-10-12 | 2006-04-13 | 2006-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-10-12 | 2010-04-13 | 2010-10-13 | $7700.00 | Window Closed / Lapsed |