Polycarbonate compositions containing polyethylene wax

Patent metadata

Field	Value
Publication number	US-10189941-B2
Application number	US-201515532571-A
Country	US
Kind code	B2
Filing date	Dec 2, 2015
Priority date	Dec 4, 2014
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

The invention relates to polycarbonate compositions with an improved thermal behavior and improved slip characteristics, achieved by the use of oxidized, acid-modified polyethylene waxes.

First claim

The invention claimed is:

1. A polycarbonate composition comprising
A) polycarbonate
B) oxidized acid-modified polyethylene wax and
D) an inorganic filler,
wherein the oxidized acid-modified polyethylene wax has an acid number of <10 mg KOH/g determined according to JIS K0070, a crystallinity of greater than 60% and less than 90%, a melting point between 90° C. and 130° C. and a viscosity average molar mass determined by viscometry between 1500 g/mol and 5000 g/mol.

2. The composition as claimed in claim 1 , wherein the composition comprises 20.0 to 99.8 wt % of polycarbonate.

3. The composition as claimed in claim 1 , wherein the composition comprises 0.05 to 10.0 wt % of oxidized acid-modified polyethylene wax.

4. The composition as claimed in claim 1 , wherein the composition comprises 0.2 to 0.5 wt % of oxidized acid-modified polyethylene wax.

5. The composition as claimed in claim 1 , wherein the composition comprises 0.04 to 4.0 wt % of additives selected from the group consisting of heat stabilizers, demolding agents and UV stabilizers.

6. The composition as claimed in claim 1 , wherein the composition comprises flame retardants and/or colorants.

7. The composition as claimed in claim 1 , wherein the inorganic filler is a glass fiber.

8. The composition as claimed in claim 1 , wherein the composition comprises 0.002 to 0.2 wt % of heat stabilizer, 0.01 wt % to 1.00 wt % of UV stabilizer and 0.05 wt % to 2.00 wt % of demolding agent.

9. The composition as claimed in claim 1 , wherein the oxidation index of the oxidized acid-modified polyethylene wax is greater than 8.

10. The composition as claimed in claim 1 , wherein the oxidized acid-modified polyethylene wax has a melt viscosity, determined as per ISO 11443, between 70 mPa·s and 800 mPa·s.

11. The composition as claimed in claim 1 , wherein it consists of
A) 46.0 to 99.8 wt % of polycarbonate,
B) 0.05 to 10 wt % of oxidized acid-modified polyethylene wax,
C1) 0.04 to 4.0 wt % of additives selected from the group of heat stabilizers, demolding agents and/or UV stabilizers,
C2) optionally further additives selected from the group of flame retardants, colorants, antistats and/or impact modifiers, and
D) 5.0 to 30.0 wt % of inorganic fillers.

12. A molding produced from a composition as claimed in claim 1 .

13. A method comprising utilizing an oxidized acid-modified polyethylene wax for reducing the coefficients of dynamic and static friction and/or improving the ball indentation temperature of polycarbonate compositions filled with at least one inorganic filler, wherein the oxidized acid-modified polyethylene wax has an acid number of <10 mg KOH/g determined according to JIS K0070, a crystallinity of greater than 60% and less than 90%, a melting point between 90° C. and 130° C. and a viscosity average molar mass determined by viscometry between 1500 g/mol and 5000 g/mol.

Assignees

• Covestro Deutschland Ag

Inventors

• Wehrmann Rolf
• Heuer Helmut Werner
• Boumans Anke
• Erkelenz Michael

Classifications

• C08L23/30 Primary

  by oxidation · CPC title

• C08L69/00 Primary

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

• C08K3/014

  Stabilisers against oxidation, heat, light or ozone · CPC title

• C08K7/14

  Glass · CPC title

• C08K3/013

  Fillers, pigments or reinforcing additives · CPC title