US5760144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aliphatic polyester polymer blends, methods for manufacturing the same, and methods for milding aliphatic polyester polymer blends
Assignee: Mitsubishi Gas Chemical Co Inc
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Filing: 1996-07-11
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Granted: 1998-06-02
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Expires: 2016-07-11
Abstract
Abstract Biodegradable polymer blends comprising of a polylactic acid or a copolymer containing lactic acid as the main constituent, and a polyhydroxyalkanoate or a copolymer containing two or more hydroxyalkanoic acids as the constituents; methods for controlling the rate of biodegradation of a polylactic acid or a copolymer containing lactic acid as the main constituent, by blending as above; methods for manufacturing such aliphatic polyester polymer blends; and methods for molding such polymer blends; are provided. The aliphatic polyester polymer blends obtained in the invention are colorless and clear, and have excellent biodegradabilities, as well as excellent mechanical strengths. The blends can be molded similarly as in conventional thermoplastic resins, so that they can be utilized in many industries, without problems in the waste product treatment after the use. Furthermore, molded products with excellent qualities are obtained from the blends, because of their improved moldabilities.
Inventors
- 👤 Eiichi Ozeki
- 👤 Jun Nagata
- 👤 Teizi Urakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:27
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
48 words
A biodegradable aliphatic polyester blend which comprises a polylactic acid having a weight-average molecular weight of not less than 100,000 and a poly-3-hydroxybutyrate, wherein of the poly-3-hydroxybutyrate is 5 to 50% by weight of said blend based upon the total amount of the polylactic acid and the poly-3-hydroxybutyrate.
Claim 2
Dependent Claim
48 words
A biodegradable aliphatic polyester blend which comprises a polylactic acid having a weight-average molecular weight of not less than 100,000 and a poly-3-hydroxybutyrate, wherein of the poly-3-hydroxybutyrate is 5 to 50% by weight of said blend based upon the total amount of the polylactic acid and the poly-3-hydroxybutyrate.
Claim 3
Independent Claim
31 words
A method for controlling the rate of biodegradation of a polylactic acid having a weight-average molecular weight of not less than 100,000 by blending it with a selected quantity of poly-3-hydroxybutyrate.
Claim 4
Independent Claim
31 words
A method for controlling the rate of biodegradation of a polylactic acid having a weight-average molecular weight of not less than 100,000 by blending it with a selected quantity of poly-3-hydroxybutyrate.
Claim 5
Independent Claim
67 words
A method for manufacturing aliphatic polyester blends which comprises the step of melt-kneading a polylactic acid having a weight-average molecular weight of not less than 100,000 and a poly-3-hydroxybutyrate in a thermal extruder, wherein the polylactic acid and the poly-3-hydroxybutyrate are blended in a blending ratio of 5 to 50% by weight of the poly-3-hydroxybutyrate based upon the total amount of the polylactic acid and the poly-3-hydroxybutyrate.
Claim 6
Independent Claim
67 words
A method for manufacturing aliphatic polyester blends which comprises the step of melt-kneading a polylactic acid having a weight-average molecular weight of not less than 100,000 and a poly-3-hydroxybutyrate in a thermal extruder, wherein the polylactic acid and the poly-3-hydroxybutyrate are blended in a blending ratio of 5 to 50% by weight of the poly-3-hydroxybutyrate based upon the total amount of the polylactic acid and the poly-3-hydroxybutyrate.
Claim 7
Dependent Claim
28 words
A method for manufacturing aliphatic blends according to claim 3, wherein the polylactic acid has a melt viscosity at the melt-kneading temperature of not less than 1,000 poise.
Claim 8
Independent Claim
69 words
A method for molding aliphatic polyester blends which comprises the step(s) of melt-kneading and molding a polylactic acid having a weight-average molecular weight of not less than 100,000 and a poly-3-hydroxybutyrate in a thermal extruder, wherein the polylactic acid and the poly-3-hydroxybutyrate are blended in a blending ratio of 5 to 50% by weight of the poly-3-hydroxybutyrate based upon the total amount of the polylactic acid and the poly-3-hydroxybutyrate.
Claim 9
Independent Claim
69 words
A method for molding aliphatic polyester blends which comprises the step(s) of melt-kneading and molding a polylactic acid having a weight-average molecular weight of not less than 100,000 and a poly-3-hydroxybutyrate in a thermal extruder, wherein the polylactic acid and the poly-3-hydroxybutyrate are blended in a blending ratio of 5 to 50% by weight of the poly-3-hydroxybutyrate based upon the total amount of the polylactic acid and the poly-3-hydroxybutyrate.
Claim 10
Dependent Claim
28 words
A method for molding aliphatic polyester blends according to claim 5, wherein the polylactic acid has melt viscosity at the melt-kneading temperature of not less than 1,000 poise.
Claim 11
Dependent Claim
50 words
A molded product produced from an aliphatic polyester blend comprising a polylactic acid having a weight-average molecular weight of not less than 100,000 and a poly-3-hydroxybutyrate, wherein the amount of the poly-3-hydroxybutyrate is 5 to 50% by weight based upon the total amount of the polylactic acid and the poly-3-hydroxybutyrate.
Claim 12
Dependent Claim
50 words
A molded product produced from an aliphatic polyester blend comprising a polylactic acid having a weight-average molecular weight of not less than 100,000 and a poly-3-hydroxybutyrate, wherein the amount of the poly-3-hydroxybutyrate is 5 to 50% by weight based upon the total amount of the polylactic acid and the poly-3-hydroxybutyrate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-06-01 | 2001-12-01 | 2002-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-06-01 | 2005-12-01 | 2006-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-06-01 | 2009-12-01 | 2010-06-02 | $7700.00 | Window Closed / Lapsed |