Claims
- 1. A laminate comprising an expanded material layer made of an expanded material and a biodegradable non-expanded material layer said expanded material being made of a hydroxycarboxylic acid based polyester having a weight-average molecular weight of from 20,000 to 400,000 comprising as structural units a structural unit derived from a hydroxycarboxylic acid, selected from the group consisting of glycolic acid, 3-hydroxybutyric acid, 3-hydroxyvaleric acid, L-lactic acid, D-lactic acid, meso-lactic acid .epsilon.-caprolactone and mixtures thereof, a structural unit derived from molecular weight increasing agent and/or a structural unit derived from polymerization catalyst deactivator.
- 2. The laminate according to claim 1, wherein said non-expanded material layer is made of said expanded material.
- 3. The laminate according to claim 1, wherein said non-expanded material layer is made of a lactic acid based polyester having a weight-average molecular weight of from 20,000 to 400,000 comprising from 40 to 95 parts by weight of a structural unit derived from lactic acid and from 5 to 60 parts by weight of a polyester structural unit derived from dicarboxylic acid and diol.
- 4. The laminate according to claim 1, wherein said non-expanded material layer comprises a structural unit derived from lactic acid and a polyester structural unit derived from dicarboxylic acid and diol and a part or whole of said polyester structural unit derived from dicarboxylic acid and/or diol has a C.sub.1-10 alkyl branched chain.
- 5. The laminate according to claim 1, wherein said non-expanded material layer is in the form of a crystal formed by heat treatment at a temperature of from not lower than its glass transition temperature to lower than its melting point.
- 6. A laminate comprising an expanded material layer made of an expanded material and a biodegradable non-expanded material layer, said expanded material being made of a hydroxycarboxylic acid based polyester having a weight-average molecular weight of from 20,000 to 400,000 comprising as structural units a structural unit derived from a hydroxycarboxylic acid selected from the group consisting of glycolic acid, 3-hydroxybutyric acid, 3-hydroxyvaleric acid, L-lactic acid, D-lactic acid, meso-lactic acid .epsilon.-caprolactone and mixtures thereof, a structural unit derived from molecular weight increasing agent and/or a structural unit derived from polymerization catalyst deactivator, a structural unit derived from dicarboxylic acid, and a structural unit derived from diol.
- 7. The laminate according to claim 6, wherein said non-expanded material layer is made of said expanded material.
- 8. The laminate according to claim 6, wherein said non-expanded material layer is made of a lactic acid based polyester having a weight-average molecular weight of from 20,000 to 400,000 comprising from 40 to 95 parts by weight of a structural unit derived from lactic acid and from 5 to 60 parts by weight of a polyester structural unit derived from dicarboxylic acid and diol.
- 9. The laminate according to claim 6, wherein said non-expanded material layer comprises a structural unit derived from lactic acid and a polyester structural unit derived from dicarboxylic acid and diol and a part or whole of said polyester structural unit derived from dicarboxylic acid and/or diol has a C.sub.1-10 alkyl branched chain.
- 10. The laminate according to claim 6, wherein said non-expanded material layer is in the form of a crystal formed by heat treatment at a temperature of from not lower than its glass transition temperature to lower than its melting point.
- 11. The expanded material according to claim 1, wherein said structural unit derived from hydroxycarboxylic acid is one derived from lactic acid.
- 12. The expanded material according to claim 1, wherein said structural unit derived from polymerization catalyst deactivator comprises a chelating agent and/or acidic phosphate component.
- 13. The expanded material according to claim 6, wherein said structural unit derived from hydroxycarboxylic acid is one derived from lactic acid.
- 14. The expanded material according to claim 6, wherein said structural unit derived from polymerization catalyst deactivator comprises a chelating agent and/or acidic phosphate component.
Priority Claims (3)
Number |
Date |
Country |
Kind |
7-309011 |
Nov 1995 |
JPX |
|
7-319005 |
Dec 1995 |
JPX |
|
8-011782 |
Jan 1996 |
JPX |
|
Parent Case Info
This application is a division of prior application Ser. No. 08/753,493, filed Nov. 26, 1996, U.S. Pat. No. 6,037,384.
US Referenced Citations (4)
Divisions (1)
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Number |
Date |
Country |
Parent |
753493 |
Nov 1996 |
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