US5883199A
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Polyactic acid-based blends
Assignee: University of Massachusetts Boston
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Filing: 1997-04-03
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Granted: 1999-03-16
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Expires: 2017-04-03
Abstract
Abstract Biodegradable blends including a first, polylactic acid-based polymer or copolymer, and a second polymer or copolymer including one or more polyesters, e.g., an aliphatic polyester or a polyester of one aliphatic C2 to C20 diacid or of a combination of two more different aliphatic C2 to C20 diacids, wherein the first and second polymers are present in a ratio of 9:1 to 1:9, are described.
Inventors
- 👤 Stephen P. McCarthy
- 👤 Richard A. Gross
- 👤 Wenguang Ma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:01
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/26; A61L15/42; A61L15/62; B; B65; B65D; B65D65/00; B65D65/38; B65D65/46; B65D65/466; C08L; C08L67/00; C08L67/02; C08L67/04; C08J2367/00; C08J2367/04; Y; Y02; Y02W; Y02W90/00; Y02W90/10; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1352; Y10T428/1397
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
62 words
A biodegradable blend comprising: (a) a first polylactic acid-based polymer or copolymer, and (b) a second polymer consisting essentially of one or more polyesters, wherein said first and second polymers are present in a ratio of 9:1 to 1:9 by weight, and wherein the second polymer is a homopolymer or random copolymer that forms a continuous or co-continuous phase in the blend.
Claim 2
Dependent Claim
62 words
A biodegradable blend comprising: (a) a first polylactic acid-based polymer or copolymer, and (b) a second polymer consisting essentially of one or more polyesters, wherein said first and second polymers are present in a ratio of 9:1 to 1:9 by weight, and wherein the second polymer is a homopolymer or random copolymer that forms a continuous or co-continuous phase in the blend.
Claim 3
Dependent Claim
37 words
The biodegradable blend of claim 1, wherein said one or more polyesters are of one aliphatic C 2 to C 20 diacid or of a combination of two more different aliphatic C 2 to C 20 diacids.
Claim 4
Dependent Claim
18 words
The biodegradable blend of claim 1, wherein said first, polylactic acid-based polymer is a homopolymer of polylactic acid.
Claim 5
Dependent Claim
40 words
The biodegradable blend of claim 1, wherein said first, polylactic acid-based polymer is selected from the group consisting of D-polylactic acid, L-polylactic acid, D,L-polylactic acid, meso-polylactic acid, and any combination of D-polylactic acid, L-polylactic acid, D,L-polylactic acid and meso-polylactic acid.
Claim 6
Dependent Claim
24 words
The biodegradable blend of claim 1, wherein said first, polylactic acid-based polymer is a copolymer having at least 60% by weight of polylactic acid.
Claim 7
Dependent Claim
32 words
The biodegradable blend of claim 1, wherein said second polymer or copolymer is selected from the group consisting of polybutylenesuccinate homopolymer, polybutyleneadipate homopolymer, polybutylenesuccinate-adipate copolymer, polyethylenesuccinate homopolymer, polyethyleneadipate homopolymer and polyethylenesuccinate-adipate copolymer.
Claim 8
Dependent Claim
13 words
The biodegradable blend of claim 1, wherein said polyester is an aliphatic polyester.
Claim 9
Dependent Claim
30 words
The biodegradable blend of claim 1, wherein said second polymer or copolymer is a copolyester of an aliphatic polyester and up to 50 percent, by weight, of an aromatic polyester.
Claim 10
Dependent Claim
13 words
The biodegradable blend of claim 8, wherein said aromatic polyester is polyethylene terephthalate.
Claim 11
Dependent Claim
21 words
A biodegradable blend of claim 1, further comprising (c) a compatibilizer consisting essentially of one or more polyesters or polyvinyl alcohols.
Claim 12
Dependent Claim
17 words
The biodegradable blend of claim 1, said blend having an elongation at break of at least 10%.
Claim 13
Dependent Claim
17 words
The biodegradable blend of claim 1, said blend having an elongation at break of at least 200%.
Claim 14
Dependent Claim
22 words
The biodegradable blend of claim 1, said blend having an elongation at break of at least 10% after 70 days of aging.
Claim 15
Dependent Claim
22 words
The biodegradable blend of claim 1, said blend having an elongation at break of at least 200% after 70 days of aging.
Claim 16
Dependent Claim
18 words
The biodegradable blend of claim 1, said blend having a toughness of at least 10 MJ/m 3 .
Claim 17
Dependent Claim
18 words
The biodegradable blend of claim 1, said blend having a toughness of at least 70 MJ/m 3 .
Claim 18
Dependent Claim
19 words
The biodegradable blend of claim 1, wherein said second polymer is present in said blend as a co-continuous phase.
Claim 19
Dependent Claim
68 words
The biodegradable blend of claim 1, wherein said first, polylactic acid-based polymer or copolymer is a homopolymer of lactic acid or a block, graft, or random copolymer of lactic acid having the formula: --(R.sub.1).sub.a --(R.sub.2).sub.b -- wherein R 1 is a lactic acid unit, R 2 is caprolactone, glycolide, trimethylene carbonate, dioxanone, butyryl lactone, or ethylene oxide, a is 10 to 10,000, and b is 0 to 10,000.
Claim 20
Dependent Claim
30 words
The biodegradable blend of claim 1, wherein said polyester has the formula: ##STR3## wherein m is 2 to 20, n is 2 to 20, and N is 10 to 10,000.
Claim 21
Dependent Claim
30 words
The biodegradable blend of claim 1, wherein said first, polylactic acid-based polymer or copolymer is a polylactic acid homopolymer, and wherein said second polymer or copolymer is a polybutylenesuccinate homopolymer.
Claim 22
Dependent Claim
30 words
The biodegradable blend of claim 1, wherein said first, polylactic acid-based polymer or copolymer is a polylactic acid homopolymer, and wherein said second polymer or copolymer is a polybutylenesuccinate-adipate copolymer.
Claim 23
Dependent Claim
65 words
A film comprising a biodegradable blend comprising: (a) a first polylactic acid-based polymer or copolymer, and (b) a second polymer consisting essentially of one or more polyesters, wherein said first and second polymers are present in a ratio of 9:1 to 1:0 by weight, and wherein th second polymer is a homopolymer or random copolymer that forms a continuous or co-continuous phase in the blend.
Claim 24
Dependent Claim
65 words
A film comprising a biodegradable blend comprising: (a) a first polylactic acid-based polymer or copolymer, and (b) a second polymer consisting essentially of one or more polyesters, wherein said first and second polymers are present in a ratio of 9:1 to 1:0 by weight, and wherein th second polymer is a homopolymer or random copolymer that forms a continuous or co-continuous phase in the blend.
Claim 25
Dependent Claim
65 words
A bag comprising a biodegradable blend comprising; (a) a first polylactic acid-based polymer or co-polymer, and (b) a Second polymer consisting essentially of one or more polyesters. wherein said first and second polymers are present in a ratio of 9:1 to 1:0 by weight, and wherein the second polymer is a homopolymer or random copolymer that forms a continuous or co-continuous phase in the blend.
Claim 26
Dependent Claim
65 words
A bag comprising a biodegradable blend comprising; (a) a first polylactic acid-based polymer or co-polymer, and (b) a Second polymer consisting essentially of one or more polyesters. wherein said first and second polymers are present in a ratio of 9:1 to 1:0 by weight, and wherein the second polymer is a homopolymer or random copolymer that forms a continuous or co-continuous phase in the blend.
Claim 27
Dependent Claim
65 words
A container comprising a biodegradable blend comprising: (a) a first polylactic acid-based polymer or copolymer, and (b) a second polymer consisting essentially of one or more polyesters, wherein said first and second polymers are present in a ratio of 9:1 to 1.0 by weight and wherein the second polymer is a homopolymer or random copolymer that forms a continuous or co-continuous phase in the blend.
Claim 28
Dependent Claim
65 words
A container comprising a biodegradable blend comprising: (a) a first polylactic acid-based polymer or copolymer, and (b) a second polymer consisting essentially of one or more polyesters, wherein said first and second polymers are present in a ratio of 9:1 to 1.0 by weight and wherein the second polymer is a homopolymer or random copolymer that forms a continuous or co-continuous phase in the blend.
Claim 29
Dependent Claim
66 words
A disposable diaper comprising a biodegradable blend comprising: (a) a first polylactic acid-based polymer or copolymer, and (b) a second polymer consisting essentially of one or more polyesters, wherein said first and second polymers are present in a ratio of 9:1 to 1:0 by weight, and wherein the second polymer is a homopolymer or random copolymer that forms a continuous or co-continuous phase in the blend.
Claim 30
Dependent Claim
66 words
A disposable diaper comprising a biodegradable blend comprising: (a) a first polylactic acid-based polymer or copolymer, and (b) a second polymer consisting essentially of one or more polyesters, wherein said first and second polymers are present in a ratio of 9:1 to 1:0 by weight, and wherein the second polymer is a homopolymer or random copolymer that forms a continuous or co-continuous phase in the blend.
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) | 2002-03-15 | 2002-09-14 | 2003-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-03-15 | 2006-09-14 | 2007-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-03-15 | 2010-09-14 | 2011-03-16 | $7700.00 | Window Closed / Lapsed |