Hydrolysis-stable polycarbonate-polyester compositions

Patent metadata

Field	Value
Publication number	US-10113063-B2
Application number	US-201515310422-A
Country	US
Kind code	B2
Filing date	May 11, 2015
Priority date	May 13, 2014
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

Compositions comprising
A) 50 to 95 parts by weight of at least one polymer selected from the group consisting of aromatic polycarbonate and aromatic polyestercarbonate, B) 5 to 50 parts by weight of at least one branched polyester, the polyester being derived from succinic acid and optionally further dicarboxylic acids and aliphatic, cycloaliphatic or araliphatic diols, C) 0 to 20 parts by weight of graft polymer, D) 0 to 20 parts by weight of vinyl (co)polymer and/or polyalkylene terephthalate, E) 0.0 to 30 parts by weight of additives,

the parts by weight being standardized to the total weight of the composition

and also the use of these hydrolysis-stable polycarbonate/polyester compositions for producing shaped bodies, and the shaped bodies themselves, where the polyester in the composition can be obtained or prepared preferably from renewable raw materials.

First claim

The invention claimed is:

1. A composition comprising:
A) 50 to 95 parts by weight of at least one polymer selected from the group consisting of aromatic polycarbonate and aromatic polyestercarbonate,
B) 5 to 50 parts by weight of at least one branched polyester, the polyester being derived from succinic acid and butanediol,
C) 0 to 20 parts by weight of graft polymer,
D) 0 to 20 parts by weight of vinyl (co)polymer and/or polyalkylene terephthalate,
E) 0 to 30 parts by weight of additives, the parts by weight being standardized to the total weight of the composition;
wherein the weight-average molecular weights Mw of component B are between 80 and 500 kg/mol, determined by gel permeation chromatography against polystyrene as reference.

2. The composition according to claim 1 , comprising:
A) 60 to 90 parts by weight of at least one polymer selected from the group consisting of aromatic polycarbonate and aromatic polyestercarbonate,
B) 10 to 40 parts by weight of at least one branched polyester, the polyester being derived from succinic acid and butanediol,
C) 0 to 15 parts by weight of graft polymer,
D) 0 to 15 parts by weight of vinyl (co)polymer and/or polyalkylene terephthalate,
E) 0.1 to 15 parts by weight of additives, the parts by weight being standardized to the total weight of the composition.

3. The composition according to claim 1 , comprising:
A) 65 to 85 parts by weight of at least one polymer selected from the group consisting of aromatic polycarbonate and aromatic polyestercarbonate,
B) 15 to 35 parts by weight of at least one branched polyester, the polyester being derived from succinic acid and butanediol,
C) 0 to 10 parts by weight of graft polymer,
D) 0 to 10 parts by weight of vinyl (co)polymer and/or polyalkylene terephthalate,
E) 0.2 to 5 parts by weight of additives, the parts by weight being standardized to the total weight of the composition.

4. The composition according to claim 1 , wherein the polyester is branched by addition of 1,1,1-trimethylolpropane.

5. The composition according to claim 1 , wherein the acid component of the polyester originates from renewable raw materials.

6. The composition according to claim 1 , comprising as component E at least one additive selected from the group of flame retardant synergists, anti-dripping agents, lubricants and mould release agents, nucleating agents, stabilizers, antistats, dyes, pigments and fillers and reinforcing agents.

7. A process for producing injection-moulded or thermoformed shaped bodies comprising the composition as claimed in claim 1 .

8. A shaped body obtained from compositions according to claim 1 .

9. The composition according to claim 1 , wherein the polyester is branched by addition of 0.1 to 0.9 wt. % of a branching agent.

10. The composition according to claim 1 , wherein the polyester is branched by addition of 0.2 to 0.6 wt. % of 1,1,1-trimethylolpropane.

11. The composition according to claim 1 , wherein the weight-average molecular weights Mw of component B are between 80 and 400 kg/mol, determined by gel permeation chromatography against polystyrene as reference.

12. A composition consisting of:
A) 50 to 95 parts by weight of at least one polymer selected from the group consisting of aromatic polycarbonate and aromatic polyestercarbonate,
B) 5 to 50 parts by weight of at least one branched polyester, the polyester being derived from succinic acid and butanediol,
C) 0 to 20 parts by weight of graft polymer,
D) 0 to 20 parts by weight of vinyl (co)polymer and/or polyalkylene terephthalate,
E) 0 to 30 parts by weight of additives, the parts by weight being standardized to the total weight of the composition,
wherein the weight-average molecular weights Mw of component B are between 40 and 500 kg/mol, determined by gel permeation chromatography against polystyrene as reference.

13. The composition according to claim 11 , wherein the polyester is branched by addition of 0.2 to 0.6 wt. % of 1,1,1-trimethylolpropane.

Assignees

• Covestro Deutschland Ag

Inventors

• Jung Mathieu
• Hufen Ralf

Classifications

• C08L69/00 Primary

  Compositions of polycarbonates; Compositions of derivatives of polycarbonates · CPC title

• C08L2205/03

  containing three or more polymers in a blend · CPC title

• C08L51/04

  grafted on to rubbers · CPC title

• C08L67/00

  Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain (of polyester-amides C08L77/12; of polyester-imides C08L79/08); Compositions of derivatives of such polymers · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title