Graphite-containing polycarbonate compositions containing a new type of flow promoter

Patent metadata

Field	Value
Publication number	US-11279812-B2
Application number	US-201816479778-A
Country	US
Kind code	B2
Filing date	Jan 19, 2018
Priority date	Jan 23, 2017
Publication date	Mar 22, 2022
Grant date	Mar 22, 2022

Abstract

The present invention relates to thermally conductive, graphite-containing polycarbonate compositions having high flowability and mouldings for the electricals and electronics industries for heat management, in particular for complex cooling plates, heat sinks and housings in lighting technology. The compositions according to the invention are in particular also suitable for thin wall designs. The compositions contain at least one saturated or unsaturated monocarboxylic acid having a chain length of 6 to 30 carbon atoms and at least one ester of this monocarboxylic acid based on glycerol and/or diglycerol.

First claim

The invention claimed is:

1. A composition comprising
A) 50 to 95 wt % of aromatic polycarbonate,
B) 25 to 35 wt % of graphite and
C) 0.6 wt % to 1.8 wt % of a mixture containing 40 to 50 wt % of diglycerol monooleate, 10 to 20 wt % of glycerol monooleate, 10 to 20 wt % of diglycerol dioleate, 1 to 3 wt % of oleic acid and up to 1.5 wt % of stearic acid and up to 1.5 wt % of palmitic acid.

2. The composition according to claim 1 comprising
A) 62 to 95 wt % of aromatic polycarbonate,
D) 0.005 to 0.5 wt % of heat stabilizer and/or transesterification stabilizer and
E) 0.1 to 30 wt % of further additives.

3. The composition according to claim 1 , consisting of
A) 63 to 77 wt % of aromatic polycarbonate,
25 to 35 wt % of graphite,
C) 0.6 wt % to 1.8 wt % of a mixture containing 40 to 50 wt % of diglycerol monooleate, 10 to 20 wt % of glycerol monooleate, 10 to 20 wt % of diglycerol dioleate, 1 to 3 wt % of oleic acid and up to 1.5 wt % of stearic acid and up to 1.5 wt % of palmitic acid
D) 0.01 to 0.2 wt % of heat stabilizer and/or transesterification stabilizer and
E) 0.2 to 15 wt % of further additives.

4. The composition according to claim 1 , wherein the graphite of component B is expanded graphite.

5. A moulding made of a composition according to claim 1 .

6. The moulding according to claim 5 , having a wall thickness of less than 3 mm.

7. The moulding according to claim 6 , having a wall thickness of less than 1.5 mm.

8. The moulding according to claim 5 , wherein the moulding is a heat sink, a housing or an extrudate.

9. A composition comprising
A) 50 to 95 wt % of aromatic polycarbonate,
B) 5 to 40 wt % of graphite and
C) 0.6 wt % to 1.8 wt % of a mixture containing 40 to 50 wt % of diglycerol monooleate, 10 to 20 wt % of glycerol monooleate, 10 to 20 wt % of diglycerol dioleate, 1 to 3 wt % of oleic acid and up to 1.5 wt % of stearic acid and up to 1.5 wt % of palmitic acid.

10. A composition comprising
A) 50 to 95 wt % of aromatic polycarbonate,
B) 20 to 40 wt % of graphite and
C) 0.6 wt % to 1.8 wt % of a mixture containing 40 to 50 wt % of diglycerol monooleate, 10 to 20 wt % of glycerol monooleate, 10 to 20 wt % of diglycerol dioleate, 1 to 3 wt % of oleic acid and up to 1.5 wt % of stearic acid and up to 1.5 wt % of palmitic acid.

Assignees

• Covestro Deutschland Ag

Inventors

• Wehrmann Rolf
• Heuer Helmut Werner
• Boumans Anke

Classifications

• 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

• C08K3/04 Primary

  Carbon · CPC title

• C08K5/09 Primary

  Carboxylic acids; Metal salts thereof; Anhydrides thereof · CPC title

• C08K5/103 Primary

  with polyalcohols · CPC title

• C08L69/00

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