Aliphatic-aromatic biodegradable polyester

Patent metadata

Field	Value
Publication number	US-2016200862-A1
Application number	US-201514881640-A
Country	US
Kind code	A1
Filing date	Oct 13, 2015
Priority date	May 8, 2008
Publication date	Jul 14, 2016
Grant date	—

Abstract

Disclosed are aliphatic-aromatic biodegradable polyesters obtained from aliphatic dicarboxylic acids, polyfunctional aromatic acids of renewable origin and particularly 2,5-furan dicarboxylic acid, and diols. Also disclosed are blends of the polyesters with other biodegradable polymers of either natural or synthetic origin. The polyesters have properties and viscosity values that make them suitable, after adjusting their molecular weight, for use in numerous practical applications such as films, injection molded products, extrusion coatings, fibers, foams, thermoformed products, extruded profiles and sheets, extrusion blow molding, injection blow molding, rotomolding, stretch blow molding.

First claim

What is claimed:

1 . A biodegradable polyester of the aliphatic-aromatic type obtained from at least one aliphatic dicarboxylic acid or ester thereof, at least one diol and at least one polyfunctional aromatic acid or ester thereof, wherein said polyfunctional aromatic acid is furan dicarboxylic acid and said at least one diol comprises 1,4-butanediol.

2 . The biodegradable polyester according to claim 1 , wherein the at least one aliphatic dicarboxylic acid is a C 2 -C 22 acid.

3 . The biodegradable polyester according to claim 2 , wherein the at least one aliphatic dicarboxylic acid or ester thereof is selected from the group consisting of adipic acid and an acid originating from renewable sources.

4 . The biodegradable polyester according to claim 3 , wherein the at least one aliphatic dicarboxylic acid or ester thereof originating from renewable sources is a C 8 -C 13 dicarboxylic acid or ester thereof.

5 . The biodegradable polyester according to claim 3 , wherein the at least one aliphatic dicarboxylic acid or ester thereof originating from renewable sources is selected from the group consisting of azelaic acid, sebacic acid, suberic acid, brassylic acid and their esters.

6 . The biodegradable polyester according to claim 1 , wherein the content of the at least one aromatic dicarboxylic acid or ester thereof is between 5% and 90% mol of the total molecular weight of the dicarboxylic acids or esters thereof.

7 . The biodegradable polyester according to claim 6 , wherein the content of the at least one aromatic dicarboxylic acid or ester thereof is between 10% and 80%.

8 . The biodegradable polyester according to claim 7 , wherein the content of the at least one aromatic dicarboxylic acid or ester thereof is between 20% and 70%.

9 . The biodegradable polyester according to claim 1 , wherein the molecular weight M n of the polyester is between 5,000 and 150,000 and the polydispersity index M w /M n is between 1.4 and 8.

10 . The biodegradable polyester according to claim 9 , wherein the molecular weight M n of the polyester is between 10,000 and 120,000.

11 . The biodegradable polyester according to claim 10 , wherein the molecular weight M n of the polyester is between 20,000 and 100,000.

12 . The biodegradable polyester according to claim 1 , wherein the at least one diol is further comprises a diol selected from the group consisting of 1,2-ethanediol, 1,2-propanediol, 1,3-propanediol, 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, neopentyl glycol, 2-methyl-1,3-propanediol, dianhydrosorbitol, dianhydromannitol, dianhydroiditol, cyclohexanediol, cyclohexane-methanediol, aromatic diols, and furan diol.

13 . The biodegradable polyester according to claim 12 , wherein the at least one diol is a C 2 -C 10 diol.

14 . A blend of the biodegradable polyester according to claim 1 , obtained also by reactive extrusion, both with polyesters of the same type and with at least one other biodegradable polymer of either natural or synthetic origin.

15 . The blend according to claim 14 , wherein the polymer of synthetic origin is selected from the group consisting of a biodegradable polyester or polymers other than polyesters.

16 . The blend according to claim 14 , wherein the polymer of natural origin is selected from the group consisting of starch, cellulose, chitin and chitosan, alginates, proteins, natural rubbers, rosinic acid and its derivatives, lignins and their derivatives.

17 . The blend according to claim 16 , wherein the starches and the celluloses are modified.

18 . The blend according to claim 17 , wherein the modified starches and celluloses are starch or cellulose esters with a degree of substitution between 0.2 and 2.5, hydroxypropylated starches, and modified starches with fatty chains.

19 . The blend according to claim 16 , wherein the starch is added in either destructured or gelatinised form, or as a filler.

20 . The blend according to claim 19 , wherein the starch represents the continuous or dispersed phase, or may even be in co-continuous form.

21 . The blend according to claim 20 , wherein the dispersed starch has dimensions smaller than one micron in mean diameter.

22 . The blend according to claim 15 , wherein the polymer of synthetic origin is polylactic acid and the polymer of natural origin is starch.

23 . A method for the manufacture of:
mono- and bi-oriented films, and films multilayered with other polymers; films for use in the agricultural sector; cling films for use with foodstuffs, for bales in agriculture, and for wrapping waste; bags and bin liners for the organic waste collection; thermo formed foodstuff packaging, both mono- and multi-layered; coatings obtained using the extrusion coating method; multilayer laminates with layers of paper, plastic, aluminium, or metallic films; expanded or expandable beads for the production of pieces obtained by sintering; expanded and semi-expanded products; foam sheets, thermosetting foam sheets, and containers obtained from them for use in foodstuff packaging; fruit and vegetable containers in general; composites with gelatinised, destructured and/or complexed starch, natural starch, flours, or vegetable or inorganic, natural fillers; fibres, woven and nonwoven fabrics for use in sanitary and hygiene products, and in the agricultural and clothing sectors, which comprises shaping a polymeric composition according to claim 1 .

Assignees

• Novamont Spa

Inventors

• Bastioli Catia
• Borsotti Giampietro
• Capuzzi Luigi
• Vallero Roberto

Classifications

• C08L67/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence) · CPC title

• C08G63/181 Primary

  Acids containing aromatic rings · CPC title

• C08L93/00

  Compositions of natural resins; Compositions of derivatives thereof (of polysaccharides C08L1/00 - C08L5/00; of natural rubber C08L7/00) · CPC title

• C08G63/672

  Dicarboxylic acids and dihydroxy compounds · CPC title

• C08L67/04

  Polyesters derived from hydroxycarboxylic acids, e.g. lactones (C08L67/06 takes precedence) · CPC title