Biodegradable aliphatic-aromatic copolyester

• US 8,193,299 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, Lallaro, Andrea Scaffidi, Cella, Giandomenico, Tosin, Maurizio
• Primary Examiner(s): Seidleck, James J
• Assistant Examiner(s): Tischler, Frances
• Application Number:
  US11/909,032
• Publication Number:
  US 20090005472A1
• Time in Patent Office: 2,272 Days
• Field of Search: 528/271, 528/272, 528/300, 528/302, 528/303, 528/304, 528/305, 528/306, 528/308, 528/308.1, 528/308.3, 528/371, 528/437, 428/35.1, 428/35.2, 428/35.7, 428/36.4, 428/77, 428/221, 428/357, 428/409, 428/411.1, 428/480, 525/27, 525/35, 525/47, 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) 53 to 54 mol % of an aromatic carboxylic acid; 2) 47 to 36 mol % of an aliphatic acid at least 50% of which is azelaic acid; B) a diol component selected from the group consisting of C₃, C₄ and C₆ diols; said AAPE being disintegrated according to the Standard ISO 20200 in 90 days.

Claims

1. A biodegradable aliphatic/aromatic copolyester (AAPE) comprising:

A) an acid component comprising repeating units of;

1) 53 to 64 mol %, of an aromatic carboxylic acid;

2) 47 to 36%, of an aliphatic acid at least 50% of which is azelaic acid;

B) a diol component selected from the group consisting of C₃, C₄ and C₆ diols;

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

a density of less than 1.22 g/cc

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

an inherent viscosity of 0.8-1.5

a Elastic Modulus higher than 100 MPa

a polydispersity index determined by means of GPC of between 1.8 and 25.

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

1) 54 to 60 mol %, of an aromatic carboxylic acid;

2) 46 to 40%, of an aliphatic acid at least 50% of which is azelaic acid.

3. Biodegradable polyesters according to claim 1, wherein the aromatic dicarboxylic acid is a compound of a phthalic acid.

4. Biodegradable polyesters according to claim 3, wherein the aromatic dicarboxylic acid is terephthalic acid.

5. Biodegradable polyesters according to claim 1, having a crystallization temperature higher than 40°

C.

6. Biodegradable polyesters according to claim 1, wherein the dialcohol is 1,4-butanediol.

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