US6235825B1
Expired / Lapsed
US
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Polylactic acid resin composition and film therefrom
Assignee: Mitsui Chemicals Inc
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Filing: 1999-03-05
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Granted: 2001-05-22
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Expires: 2019-03-05
Abstract
Abstract A polylactic acid-based resin composition composed of a high molecular ingredient (A) comprising polylactic acid (a1) and an aliphatic polyester (B), and a film, particularly an inflation film, prepared from the resin composition. The film comprising the polylactic acid-based resin composition of the invention is biodegradable and excellent in flexibility and resistance to blocking of film and bleeding-out of plasticizer, has no anisotropy in tear strength, and can be suitably used for an agricultural multi-film and garbage bag. When the film of the invention is used for food wrapping, the film prevents fungus growth and contamination of color or odor, and thus can be suitably used.
Inventors
- 👤 Yasunori Yoshida
- 👤 Shoji Obuchi
- 👤 Yasuhiro Kitahara
- 👤 Takayuki Watanabe
- 👤 Hisashi Aihara
- 👤 Tomoyuki Nakata
- 👤 Kazuhiko Suzuki
- 👤 Masanobu Ajioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:03
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; B; B29; B29C; B29C55/00; B29C55/28; C08K; C08K5/00; C08K5/0008; C08K5/0016; C08L; C08L67/00; C08L67/02; C08L67/04; B29K; B29K2995/00; B29K2995/0037; B29K2995/0059; B29K2995/006; C08J2367/00; C08J2367/04
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
80 words
A polylactic acid-based resin composition comprising 100 parts by weight of an ingredient (A) and 5 to 25 parts by weight of a biodegradable plasticizer (B), wherein said ingredient (A) comprises 55-85% by weight of polylactic acid (a1) having a weight average molecular weight of at least 10,000 and 15 to 45% by weight of a biodegradable aliphatic polyester (a2) having a weight average molecular weight of at least 10,000 and having a melting point of 80 to 250° C.
Claim 2
Dependent Claim
80 words
A polylactic acid-based resin composition comprising 100 parts by weight of an ingredient (A) and 5 to 25 parts by weight of a biodegradable plasticizer (B), wherein said ingredient (A) comprises 55-85% by weight of polylactic acid (a1) having a weight average molecular weight of at least 10,000 and 15 to 45% by weight of a biodegradable aliphatic polyester (a2) having a weight average molecular weight of at least 10,000 and having a melting point of 80 to 250° C.
Claim 3
Dependent Claim
19 words
The polylactic acid-based resin composition according to claim 1 , wherein the biodegradable aliphatic polyester (a2) is polybutylene succinate.
Claim 4
Dependent Claim
39 words
The polylactic acid-based resin composition according to claim 2 , wherein the biodegradable plasticizer (B) is one or more plasticizers selected from the group consisting of an aliphatic polybasic acid ester, aliphatic polyhydric alcohol ester and oxyacid acid ester.
Claim 5
Dependent Claim
28 words
The polylactic acid-based resin composition according to claim 2 , wherein the biodegradable plasticizer (B) is one or more of acetyltributylcitric acid, triacetin, dibutyl sebacate and triethyleneglycol diacetate.
Claim 6
Dependent Claim
118 words
A polylactic acid-based resin film comprising a polylactic acid-based resin composition comprising 5 to 25 parts by weight of a biodegradable plasticizer (B) for 100 parts by weight of an ingredient (A) containing 55 to 85% by weight of polylactic acid (a1) having a weight average molecular weight of at least 10,000 and 15 to 45% by weight of a biodegradable aliphatic polyester (a2) having a weight average molecular weight of at least 10,000 having a melting point of 80 to 250° C., having an elastic modulus of 200 to 1,000 MPa and having a longitudinal/transverse ratio of 0.8 to 1.2 in tear strength and which does not exude plasticizer or exhibit blocking at 60 to 120° C.
Claim 7
Dependent Claim
118 words
A polylactic acid-based resin film comprising a polylactic acid-based resin composition comprising 5 to 25 parts by weight of a biodegradable plasticizer (B) for 100 parts by weight of an ingredient (A) containing 55 to 85% by weight of polylactic acid (a1) having a weight average molecular weight of at least 10,000 and 15 to 45% by weight of a biodegradable aliphatic polyester (a2) having a weight average molecular weight of at least 10,000 having a melting point of 80 to 250° C., having an elastic modulus of 200 to 1,000 MPa and having a longitudinal/transverse ratio of 0.8 to 1.2 in tear strength and which does not exude plasticizer or exhibit blocking at 60 to 120° C.
Claim 8
Dependent Claim
42 words
The polylactic acid-based resin film according to claim 5 , wherein the tear strength is 20 to 1,000 g both in longitudinal and transverse directions when converted to the value of superimposing 16 sheets of film having a thickness of 30 μm.
Claim 9
Dependent Claim
18 words
The polylactic acid-based resin film according to claim 6 , wherein the aliphatic polyester (a2) is polybutylene succinate.
Claim 10
Dependent Claim
38 words
The polylactic acid-based resin film according to claim 7 , wherein the plasticizer (B) is one or more compounds selected from the group consisting of an aliphatic polybasic acid ester, aliphatic polyhydric alcohol ester and oxyacid acid ester.
Claim 11
Dependent Claim
33 words
The polylactic acid-based resin film according to claim 7 , wherein the plasticizer (B) is one or more compounds selected from the group consisting of acetyltributylcitric acid, triacetin, dibutyl sebacate and triethyleneglycol diacetate.
Claim 12
Dependent Claim
17 words
The polylactic acid-based resin film according to claim 9 , wherein the film is an inflation film.
Claim 13
Dependent Claim
106 words
A process for preparing a polylactic acid-based resin film by inflation-molding a polylactic acid-based resin composition comprising 5 to 25 parts by weight of a biodegradable plasticizer (B) for 100 parts by weight of an ingredient (A) containing 55 to 85% by weight of polylactic acid (a1) having a weight average molecular weight of at least 10,000 and 15 to 45% by weight of a biodegradable aliphatic polyester (a2) having a weight average molecular weight of at least 10,000 and having a melting point of 80 to 250° C., at resin extrusion temperature of 150 to 220° C. with a blow-up ratio of 1.5 to 3.0.
Claim 14
Dependent Claim
106 words
A process for preparing a polylactic acid-based resin film by inflation-molding a polylactic acid-based resin composition comprising 5 to 25 parts by weight of a biodegradable plasticizer (B) for 100 parts by weight of an ingredient (A) containing 55 to 85% by weight of polylactic acid (a1) having a weight average molecular weight of at least 10,000 and 15 to 45% by weight of a biodegradable aliphatic polyester (a2) having a weight average molecular weight of at least 10,000 and having a melting point of 80 to 250° C., at resin extrusion temperature of 150 to 220° C. with a blow-up ratio of 1.5 to 3.0.
Claim 15
Dependent Claim
22 words
The process for preparing a lactic acid-based resin film according to claim 11 , wherein the aliphatic polyester (a2) is polybutylene succinate.
Claim 16
Dependent Claim
42 words
The process for preparing a lactic acid-based resin film according to claim 12 , wherein the plasticizer (B) is one or more compounds selected from the group consisting of an aliphatic polybasic acid ester, aliphatic polyhydric alcohol ester and oxyacid acid ester.
Claim 17
Dependent Claim
37 words
The process for preparing a lactic acid-based resin film according to claim 12 , wherein the plasticizer (B) is one or more compounds selected from the group consisting of acetyltributylcitric acid, triacetin, dibutyl sebacate and triethyleneglycol diacetate.
Claim 18
Dependent Claim
39 words
The polylactic acid-based resin composition according to claim 1 , wherein the biodegradable plasticizer (B) is one or more plasticizers selected from the group consisting of an aliphatic polybasic acid ester, aliphatic polyhydric alcohol ester and oxyacid acid ester.
Claim 19
Dependent Claim
28 words
The polylactic acid-based resin composition according to claim 1 , wherein the biodegradable plasticizer (B) is one or more of acetyltributylcitric acid, triacetin, dibutyl sebacate and triethyleneglycol diacetate.
Claim 20
Dependent Claim
18 words
The polylactic acid-based resin film according to claim 5 , wherein the aliphatic polyester (a2) is polybutylene succinate.
Claim 21
Dependent Claim
38 words
The polylactic acid-based resin film according to claim 17 , wherein the plasticizer (B) is one or more compounds selected from the group consisting of an aliphatic polybasic acid ester, aliphatic polyhydric alcohol ester and oxyacid acid ester.
Claim 22
Dependent Claim
38 words
The polylactic acid-based resin film according to claim 6 , wherein the plasticizer (B) is one or more compounds selected from the group consisting of an aliphatic polybasic acid ester, aliphatic polyhydric alcohol ester and oxyacid acid ester.
Claim 23
Dependent Claim
38 words
The polylactic acid-based resin film according to claim 5 , wherein the plasticizer (B) is one or more compounds selected from the group consisting of an aliphatic polybasic acid ester, aliphatic polyhydric alcohol ester and oxyacid acid ester.
Claim 24
Dependent Claim
33 words
The polylactic acid-based resin film according to claim 17 , wherein the plasticizer (B) is one or more compounds selected from the group consisting of acetyltributylcitric acid, triacetin, dibutyl sebacate and triethyleneglycol diacetate.
Claim 25
Dependent Claim
33 words
The polylactic acid-based resin film according to claim 6 , wherein the plasticizer (B) is one or more compounds selected from the group consisting of acetyltributylcitric acid, triacetin, dibutyl sebacate and triethyleneglycol diacetate.
Claim 26
Dependent Claim
33 words
The polylactic acid-based resin film according to claim 5 , wherein the plasticizer (B) is one or more compounds selected from the group consisting of acetyltributylcitric acid, triacetin, dibutyl sebacate and triethyleneglycol diacetate.
Claim 27
Dependent Claim
17 words
The polylactic acid-based resin film according to claim 8 , wherein the film is an inflation film.
Claim 28
Dependent Claim
17 words
The polylactic acid-based resin film according to claim 7 , wherein the film is an inflation film.
Claim 29
Dependent Claim
17 words
The polylactic acid-based resin film according to claim 6 , wherein the film is an inflation film.
Claim 30
Dependent Claim
17 words
The polylactic acid-based resin film according to claim 5 , wherein the film is an inflation film.
Claim 31
Dependent Claim
42 words
The process for preparing a lactic acid-based resin film according to claim 11 , wherein the plasticizer (B) is one or more compounds selected from the group consisting of an aliphatic polybasic acid ester, aliphatic polyhydric alcohol ester and oxyacid acid ester.
Claim 32
Dependent Claim
37 words
The process for preparing a lactic acid-based resin film according to claim 11 , wherein the plasticizer (B) is one or more compounds selected from the group consisting of acetyltributylcitric acid, triacetin, dibutyl sebacate and triethyleneglycol diacetate.
References Cited (Backward Citations)
US5753782A
Cited
US5866634A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-05-21 | 2004-11-20 | 2005-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-05-21 | 2008-11-20 | 2009-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-05-21 | 2012-11-20 | 2013-05-22 | $7700.00 | Window Closed / Lapsed |