Polyester molding compounds with low TOC emission

Patent metadata

Field	Value
Publication number	US-9815980-B2
Application number	US-201414894543-A
Country	US
Kind code	B2
Filing date	May 27, 2014
Priority date	Jun 7, 2013
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

1. Thermoplastic molding composition comprising
A) from 30 to 99.99% by weight of a polyester composed of from 50 to 100% by weight of at least one polyalkylene terephthalate A1), based on A), and from 0 to 50% by weight of a polyester A2), differing from A1), B) from 0.01 to 2% by weight of an acrylic acid polymer, composed of B1) from 70 to 100% by weight of acrylic acid, B2) from 0 to 30% by weight of at least one other ethylenically unsaturated monomer copolymerizable with acrylic acid, selected from the group of monoethylenically unsaturated carboxylic acids, and C) from 0 to 70% by weight of other additional substances,

where the total of the percentages by weight of components A) to C) is 100%.

First claim

The invention claimed is:

1. A thermoplastic molding composition having a TOC emission less than or equal to 100 ppm (in accordance with VDA 277), wherein the thermoplastic molding composition comprises
A) from 30 to 99.99% by weight of a polyester composed of from 50 to 100% by weight of at least one polyalkylene terephthalate A1), based on A), and from 0 to 50% by weight of a polyester A2), differing from A1),
B) from 0.01 to 2% by weight of an acrylic acid polymer, composed of
B1) from 70 to 100% by weight of acrylic acid,
B2) from 0 to 30% by weight of at least one other ethylenically unsaturated monomer copolymerizable with acrylic acid, selected from the group of monoethylenically unsaturated carboxylic acids, and
C) from 0 to 70% by weight of other additional substances,
where the total of the percentages by weight of components A) to C) is 100%,
and wherein polyester A2) is selected from the group consisting of an aromatic polyester, a copolyetherester, and a halogen-free polycarbonate.

2. The thermoplastic molding composition according to claim 1 , where a pH of component B) is less than 4.

3. The thermoplastic molding composition according to claim 1 , where an average molar mass M w of component B) is from 1000 to 12,000 g/mol.

4. The thermoplastic molding composition according to claim 1 , where component B) is composed of
B1) from 85 to 100% by weight of acrylic acid, and
B2) from 0 to 15% by weight of the copolymerizable monomer according to claim 1 .

5. The thermoplastic molding composition according to claim 1 , in which the comonomer is selected from the group consisting of methacrylic acid, maleic acid, fumaric acid, citraconic acid, mesaconic acid, and mixtures thereof.

6. A fiber, a foil, or a molding comprising a thermoplastic molding composition having a TOC emission less than or equal to 100 ppm (in accordance with VDA 277), wherein the thermoplastic molding composition comprises
A) from 30 to 99.99% by weight of a polyester composed of from 50 to 100% by weight of at least one polyalkylene terephthalate A1), based on A), and from 0 to 50% by weight of a polyester A2), differing from A1),
B) from 0.01 to 2% by weight of an acrylic acid polymer, composed of
B1) from 70 to 100% by weight of acrylic acid,
B2) from 0 to 30% by weight of at least one other ethylenically unsaturated monomer copolymerizable with acrylic acid, selected from the group of monoethylenically unsaturated carboxylic acids, and
C) from 0 to 70% by weight of other additional substances,
where the total of the percentages by weight of components A) to C) is 100%,
and wherein polyester A2) is selected from the group consisting of an aromatic polyester, a copolyetherester, and a halogen-free polycarbonate.

7. The fiber, foil, or molding according to claim 6 designed for use with food or drink, cosmetics products, medicaments, drinking-water applications, in motor-vehicle interiors, or for kinematic systems.

8. A method of producing a fiber, foil, or molding comprising providing a thermoplastic molding composition, and forming the thermoplastic molding composition into a fiber, foil, or molding, wherein the thermoplastic molding composition comprises
A) from 30 to 99.99% by weight of a polyester composed of from 50 to 100% by weight of at least one polyalkylene terephthalate A1), based on A), and from 0 to 50% by weight of a polyester A2), differing from A1),
B) from 0.01 to 2% by weight of an acrylic acid polymer, composed of
B1) from 70 to 100% by weight of acrylic acid,
B2) from 0 to 30% by weight of at least one other ethylenically unsaturated monomer copolymerizable with acrylic acid, selected from the group of monoethylenically unsaturated carboxylic acids, and
C) from 0 to 70% by weight of other additional substances,
where the total of the percentages by weight of components A) to C) is 100%,
and wherein polyester A2) is selected from the group consisting of an aromatic polyester, a copolyetherester, and a halogen-free polycarbonate.

9. The method of claim 8 wherein the thermoplastic molding composition is formed by extrusion.

10. The fiber, foil, or molding according to claim 6 , where a pH of component B) is less than 4.

11. The fiber, foil, or molding according to claim 6 , where an average molar mass M w of component B) is from 1000 to 12,000 g/mol.

12. The fiber, foil, or molding according to claim 6 , where component B) is composed of
B1) from 85 to 100% by weight of acrylic acid, and
B2) from 0 to 15% by weight of the copolymerizable monomer according to claim 6 .

13. The fiber, foil, or molding according to claim 6 , in which the comonomer is selected from the group consisting of methacrylic acid, maleic acid, fumaric acid, citraconic acid, mesaconic acid, and mixtures thereof.

14. The method according to claim 8 , where a pH of component B) is less than 4.

15. The method according to claim 8 , where an average molar mass M w of component B) is from 1000 to 12,000 g/mol.

16. The method according to claim 8 , where component B) is composed of
B1) from 85 to 100% by weight of acrylic acid, and
B2) from 0 to 15% by weight of the copolymerizable monomer according to claim 8 .

17. The method according to claim 8 , in which the comonomer is selected from the group consisting of methacrylic acid, maleic acid, fumaric acid, citraconic acid, mesaconic acid, and mixtures thereof.

Assignees

• Basf Se

Inventors

• Moeller Anna Karina
• Kniesel Simon

Classifications

• C08L2205/06

  having improved processability or containing aids for moulding methods · CPC title

• C08L67/02 Primary

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

• C08L33/02

  Homopolymers or copolymers of acids; Metal or ammonium salts thereof · CPC title