Biodegradable aliphatic-aromatic polyester

• US 8,193,301 B2
• Filed: 03/17/2006
• Issued: 06/05/2012
• Est. Priority Date: 03/18/2005
• Status: Active Grant

• Current Assignee: Novamont S.p.a.
• Original Assignee: Novamont S.p.a.
• Inventors: Bastioli, Catia, Milizia, Tiziana, Floridi, Giovanni, Scaffidi Lallaro, Andrea, Cella, Giandomenico, Tosin, Maurizio
• Primary Examiner(s): Seidleck, James J
• Assistant Examiner(s): Tischler, Frances
• Application Number:
  US11/909,055
• Publication Number:
  US 20080188593A1
• Time in Patent Office: 2,272 Days
• Field of Search: 528/272, 528/437, 528/302, 528/271, 528/303, 528/304, 528/305, 528/306, 528/308, 528/308.1, 528/308.3, 428/480, 428/35.2, 428/35.7, 428/36.4, 428/77, 428/221, 428/357, 428/409, 428/411.1, 428/35.1, 524/27, 524/35, 524/47, 525/35, 525/418, 525/419, 525/437
• US Class Current: 528/302
• CPC Class Codes: C08G 63/16 Dicarboxylic acids and dihydroxy compounds
• CPC Class Codes: C08L 1/00 Compositions of cellulose, modified cellulose or cellulose derivatives
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 3/02 Starch; Degradation products thereof, e.g. dextrin
• CPC Class Codes: C08L 67/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds C08L67/06 takes precedence
• CPC Class Codes: C08L 67/04 Polyesters derived from hydroxycarboxylic acids, e.g. lactones C08L67/06 takes precedence
• CPC Class Codes: Y10T 428/1331 Single layer [continuous layer]
• CPC Class Codes: Y10T 428/1334 Nonself-supporting tubular film or bag [e.g., pouch, envelope, packet, etc.]
• CPC Class Codes: Y10T 428/1352 Polymer or resin containing [i.e., natural or synthetic]
• CPC Class Codes: Y10T 428/249921 Web or sheet containing structurally defined element or component
• CPC Class Codes: Y10T 428/29 Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
• CPC Class Codes: Y10T 428/31504 Composite [nonstructural laminate]
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]

Abstract

Biodegradable aliphatic/aromatic copolyester comprising: A) an acid component comprising repeating units of: 1) 49 to 63 mol % of an aromatic carboxylic acid; 2) 51 to 37 mol % of an aliphatic carboxylic acid, at least 50% of which is brassylic acid; B) a diol component; said copolyester being disintegrated according to the Standard ISO 20200 in 90 days.

Claims

1. Biodegradable aliphatic/aromatic copolyester (AAPE) comprising:

A) an acid component comprising repeating units of;

1) 49 to 63 mol % of a polyfunctional aromatic acid;

51 to 37% of an aliphatic acid, at least 50% of which is brassylic acid,

B) a diol component;

said AAPE being disintegrated according to the Standard ISO 20200 in 90 days, and having;

a density of less than or equal to 1.18 g/cc;

a number average molecular weight M_n of 40,000-140,000;

an inherent viscosity of 0.8-1.5.

2. Biodegradable polyesters according to claim 1, wherein said acid component A) comprises repeating units of:

1) 50 to 60 mol % of a polyfunctional aromatic acid;

2) 50 to 40 mol % of an aliphatic acid, at least 50% of which is brassylic acid.

3. Biodegradable polyesters according to claim 1, having a density of less than 1.17 g/cc.

4. Biodegradable polyester according to claim 1, wherein said polyfunctional aromatic acid is a dicarboxylic acid.

5. Biodegradable polyester according to claim 1, having a crystallization temperature T_c higher than 35°

C.

6. Biodegradable polyester according to claim 1, having a crystallization temperature T_c higher than 40°

C.

7. Biodegradable polyester according to claim 1, having a crystallization temperature T_c higher than 50′

C.

8. Biodegradable polyester according to claim 1, having a Energy at break higher than 100 MJ/m².

9. Biodegradable polyester according to claim 8, haying a Elmendorf tear strength higher than 100 N/mm in the cross direction, higher than 20 N/mm in the longitudinal direction and higher than 60 N/mm for the quantity

(cross direction+longitudinal direction)/2.

10. Biodegradable polyesters according to claim 1, in which the dialcohols are selected from the group consisting of 1,2-ethanediol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, 1,11-undecanediol, 1,12-dodecanediol, 1,13-tridecanediol, 1,4-cyclohexanedimethanol, propylene glycol, neo-pentyl glycol, 2-methyl-1,3-propanediol, dianhydrosorbitol, dianhydromannitol, dianhydroiditol, cyclohexanediol, and cyclohexane-methanediol.

11. Biodegradable polyester according to claim 1, wherein said dialcohols are diols of the C₂-C₁₀diols.

12. Biodegradable polyesters according to claim 1, wherein said dialcohols are C₂-C₄ diols.

13. Biodegradable polyester according to claim 10, wherein said dialcohol is 1-4 butanediol.

14. Biodegradable polyester according to claim 4, wherein said dicarboxylic acid is selected from the group consisting of the phthalic acids.

15. Biodegradable polyester according to claim 4, wherein said dicarboxylic acid is terephthalic acid.

16. A film comprising the polyesters according to claim 1.