Biologically-degradable polyester mixture

Patent metadata

Field	Value
Publication number	US-9447274-B2
Application number	US-201113182030-A
Country	US
Kind code	B2
Filing date	Jul 13, 2011
Priority date	Jan 12, 2005
Publication date	Sep 20, 2016
Grant date	Sep 20, 2016

Abstract

The invention relates to biodegradable polyester mixture, comprising
i) from 5 to 80% by weight, based on the total weight of components i to ii, of at least one polyester based on aliphatic and aromatic dicarboxylic acids and on aliphatic dihydroxy compounds, and ii) from 20 to 95% by weight, based on the total weight of components i to ii, of at least one biodegradable homo- or copolyester selected from the group consisting of polylactide, polycaprolactone, polyhydroxyalkanoates, and polyesters composed of aliphatic dicarboxylic acids and of aliphatic diols, and iii) from 0.1 to 15% by weight, based on the total weight of components i to ii, a) of a copolymer containing epoxy groups and based on styrene, acrylate, and/or methacrylate, b) of a bisphenol A epoxide, or c) of a fatty acid amide or fatty acid ester or natural oil containing epoxy groups; and iv) from 0 to 15% by weight of additive; and v) from 0 to 50% by weight of inorganic or organic filler,

and also to processes for their preparation and a method for their use.

First claim

The invention claimed is:

1. A biodegradable polyester mixture, comprising
i) from 5 to 80% by weight, based on the total weight of i) and ii), and component i) comprises
A) an acid component composed of
a1) from 40 to 60 mol % of succinic acid, adipic acid, sebacic acid, their ester-forming derivatives, or mixtures thereof; and
a2) from 40 to 60 mol % of terephthalic acid or its ester-forming derivatives;

wherein the sum of the molar percentages of a1) and a2), equal 100%; and
B) is 1,4-butanediol or 1,3-propanediol

and
D) optionally a component selected from the group consisting of
d1) at least one compound having at least three groups capable of ester formation;
d2) at least one isocyanate;
d3) at least one divinyl ether; and
d4) mixtures thereof:

and
ii) from 20 to 95% by weight, based on the total weight of i) and ii), of polyhydroxybutyrate or polyhydroxybutyrate-co-valerate; and
iii) from 0.1 to 15% by weight, based on the total weight of i) and ii), of a copolymer composed of styrene and glycidyl (meth)acrylates; and
iv) from 0 to 15% by weight of additive; and
v) from 0 to 50% by weight of inorganic or organic filler.

2. The biodegradable polyester mixture of claim 1 , wherein i) forms a continuous phase.

3. The biodegradable polyester mixture of claim 1 , wherein iii) is present in an amount of from 0.1 to 10% by weight, based on the total weight of i) and ii).

4. A process for preparing the biodegradable polyester mixture of claim 1 , wherein said process comprises the step of mixing and reacting i), ii), and iii).

5. A process for preparing the biodegradable polyester mixture of claim 1 , wherein said process comprises the steps of:
(1) mixing from 5 to 35% by weight of iii) with from 65 to 95% by weight of i) at a temperature in the range of from 110 to 145° C. to give a branching agent masterbatch, and
(2) admixing ii), and optionally additional i), with said branching agent masterbatch, and reacting the resultant mixture of i), ii), and iii) at a temperature in the range of from 150 to 250° C.

6. The process of claim 5 , further comprising the additional step (3) of adding additional ii) to said resultant mixture.

7. The process of claim 6 , wherein polymeric or oligomeric 1,3-propionate of sebacic acid and/or 1,4-butanoate of sebacic acid is added to one or more of steps (1), (2), or (3).

8. The process of claim 4 , wherein polymeric or oligomeric 1,3-propionate of sebacic acid and/or 1,4-butanoate of sebacic acid is added during said step.

9. A molding, foil, or fiber comprising the biodegradable polyester mixture of claim 1 .

10. The biodegradable polyester mixture of claim 1 , wherein component ii) is polyhydroxybutyrate.

11. The biodegradable polyester mixture of claim 1 , wherein component ii) is polyhydroxybutyrate-co-valerate.

Assignees

• Seeliger Ursula
• Skupin Gabriel
• STÄRKE Dirk
• Basf Se

Inventors

• Seeliger Ursula
• Skupin Gabriel
• STÄRKE Dirk

Classifications

• C08K5/101

  of monocarboxylic acids · CPC title

• C08L67/02 Primary

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

• C08L25/14

  with unsaturated esters · CPC title

• C08L63/00

  Compositions of epoxy resins; Compositions of derivatives of epoxy resins · CPC title

• C08K5/20

  Carboxylic acid amides · CPC title