US6136905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
L-lactic acid polymer composition, molded product and film
Assignee: Mitsui Chemicals Inc
•
Filing: 1997-12-22
•
Granted: 2000-10-24
•
Expires: 2017-12-22
Abstract
Abstract A lactic acid polymer composition comprising formulating 100 parts by weight of a mixture consisting of 80-95% by weight of an L-lactic acid polymer having an L-lactic acid proportion of 75% or more and 5-20% by weight of a plasticizer selected from the group consisting of a polyhydric alcohol ester and a hydroxypolycarboxylic acid ester, 0.1-5 parts by weight of an anti-blocking agent having a SiO2 content of 90% or more and an average particle size of 7-50 nm, and 0.1-2 parts by weight of a slip agent; a molded product and film obtained from the composition; and a preparation process of the same are disclosed. The molded product and film are excellent in processability, transparency, flexibility, anti-blocking property and slip, and can be degraded into harmless water and carbon dioxide under natural environment, when abandoned.
Inventors
- 👤 Kazuhiko Suzuki
- 👤 Takayuki Watanabe
- 👤 Yasuhiro Kitahara
- 👤 Masanobu Ajioka
- 👤 Shuhei Ikado
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:36
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/11; C08K3/00; C08K3/34; C08K3/36; C08K5/101; C08K5/103; C08K5/16; C08K5/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
148 words
An L-lactic acid polymer molded product prepared by heat treating at 40-65° C. and successive molding a L-lactic acid polymer composition comprising 100 parts by weight of a mixture consisting essentially of 80-95% by weight of an L-lactic acid polymer having an L-lactic acid proportion of 75% or more and 5-20% by weight of a plasticizer selected from the group consisting of a polyhydric alcohol ester and a hydroxypolycarboxylic acid ester wherein said percentages of L-lactic acid polymer and plasticizer are based on the total amount of L-lactic acid polymer and plasticizer, 0.1-5 parts by weight of an antiblocking agent having a SiO 2 content of 90% or more and an average particle size of 7-50 nm, and 0.1-2 parts by weight of a slip agent, the parts by weight of the antiblocking agent and the slip agent being based on 100 parts by weight of the mixture.
Claim 2
Dependent Claim
148 words
An L-lactic acid polymer molded product prepared by heat treating at 40-65° C. and successive molding a L-lactic acid polymer composition comprising 100 parts by weight of a mixture consisting essentially of 80-95% by weight of an L-lactic acid polymer having an L-lactic acid proportion of 75% or more and 5-20% by weight of a plasticizer selected from the group consisting of a polyhydric alcohol ester and a hydroxypolycarboxylic acid ester wherein said percentages of L-lactic acid polymer and plasticizer are based on the total amount of L-lactic acid polymer and plasticizer, 0.1-5 parts by weight of an antiblocking agent having a SiO 2 content of 90% or more and an average particle size of 7-50 nm, and 0.1-2 parts by weight of a slip agent, the parts by weight of the antiblocking agent and the slip agent being based on 100 parts by weight of the mixture.
Claim 3
Dependent Claim
27 words
The L-lactic acid polymer molded product of claim 1 wherein the molded product has a haze of 4% or less for a product thickness of 1 mm.
Claim 4
Dependent Claim
20 words
The L-lactic acid polymer molded product of claim 1 wherein the molding is an injection molding or a blow molding.
Claim 5
Dependent Claim
16 words
The L-lactic acid polymer molded product of claim 1 wherein the molded product is a sheet.
Claim 6
Dependent Claim
14 words
An L-lactic acid polymer stretched film obtained by stretching the sheet of claim 4.
Claim 7
Dependent Claim
27 words
The L-lactic acid polymer stretched film of claim 5 wherein the stretched film has a haze of 2% or less for a film thickness of 300 μm.
Claim 8
Dependent Claim
35 words
An L-lactic acid polymer non-shrink stretched film which is prepared by further heat treating the stretched film of claim 5 at 120-130° C. and has a heat shrinkage of less than 1% at 120° C.
Claim 9
Dependent Claim
33 words
An L-lactic acid polymer shrink stretched film which is prepared by further heat treating the stretched film of claim 5 at 35-60° C. and has a heat shrinkage of 10-45% at 120° C.
References Cited (Backward Citations)
US4622244A
Cited
US5358475A
Cited
DE3635679A1
Cited
US5444113A
Cited
US5389447A
Cited
US5076983A
Cited
WO1992004413A1
Cited
US5525646A
Cited
US5340646A
Cited
EP0523789A1
Cited
US5444107A
Cited
JPH0624501A
Cited
US5489474A
Cited
JPH0690628A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-10-24 | 2004-04-24 | 2004-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-10-24 | 2008-04-24 | 2008-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-10-24 | 2012-04-24 | 2012-10-24 | $7700.00 | Window Closed / Lapsed |