Styrene copolymer composition with improved residual gloss

Patent metadata

Field	Value
Publication number	US-11225571-B2
Application number	US-201816633362-A
Country	US
Kind code	B2
Filing date	Jul 25, 2018
Priority date	Jul 26, 2017
Publication date	Jan 18, 2022
Grant date	Jan 18, 2022

Abstract

Thermoplastic polymer compositions (P) comprising 90 to 99.9 wt.-% of at least one styrene-based copolymer, 0.1 to 10 wt.-% of at least one copolymer at least comprising repeating units derived from at least one α-olefin monomer and at least one vinyl-aromatic monomer, at least one inorganic phosphate compound, at least one polyolefin wax and optionally at least one colorant, dye or pigment, and/or at least one further additive show improved properties with respect to residual gloss after abrasion combined with improved melt flow characteristics while heat resistance is not affected.

First claim

The invention claimed is:

1. A thermoplastic polymer composition (P) comprising:
(A) 90 to 99.9 wt.-%, based on the total weight of the thermoplastic polymer composition (P), of at least one styrene-based copolymer;
(B) 0.1 to 10 wt.-%, based on the total weight of the thermoplastic polymer composition (P), of at least one copolymer composition comprising:
(B-1) 75 to 98 wt.-%, based on the total weight of the copolymer composition (B), of at least one copolymer at least comprising repeating units derived from at least one α-olefin monomer and at least one vinyl-aromatic monomer;
(B-2) 1 to 25 wt.-%, based on the total weight of the copolymer composition (B), of at least one inorganic phosphate compound; and
(B-3) 1 to 22 wt.-%, based on the total weight of the copolymer composition (B), of at least one polyolefin wax;

(C) 0 to 9.9 wt.-%, based on the total weight of the thermoplastic polymer composition (P), of at least one colorant, dye, or pigment; and
(D) 0 to 3 wt.-%, based on the total weight of the thermoplastic polymer composition (P), of at least one further additive.

2. The thermoplastic polymer composition (P) according to claim 1 comprising:
(A) 95 to 99.5 wt.-%, based on the total weight of the thermoplastic polymer composition (P), of at least one styrene-based copolymer;
(B) 0.5 to 5 wt.-%, based on the total weight of the thermoplastic polymer composition (P), of at least one copolymer composition comprising:
(B-1) 75 to 96 wt.-%, based on the total weight of the copolymer composition (B), of at least one copolymer at least comprising repeating units derived from at least one α-olefin monomer and at least one vinyl-aromatic monomer;
(B-2) 3 to 10 wt.-%, based on the total weight of the copolymer composition (B), of at least one inorganic phosphate compound; and
(B-3) 1 to 22 wt.-%, based on the total weight of the copolymer composition (B), of at least one polyolefin wax;

(C) 0 to 4.5 wt.-%, based on the total weight of the thermoplastic polymer composition (P), of at least one colorant, dye, or pigment; and
(D) 0 to 3 wt.-%, based on the total weight of the thermoplastic polymer composition (P), of at least one further additive.

3. The thermoplastic polymer composition (P) according to claim 1 , wherein the at least one inorganic phosphate compound (B-2) comprises at least one alkaline phosphate compound, earth alkaline phosphate compound, or mixtures thereof.

4. The thermoplastic polymer composition (P) according to claim 1 , wherein the thermoplastic polymer composition (P) has a gloss reduction of less than 5% after grid cut test according to norm PV3952.

5. The thermoplastic polymer composition (P) according to claim 1 , wherein the thermoplastic polymer composition (P) has a melt flow rate (MVR, 220/10), which is increased (improved) by a factor of at least 4, whereas VST B50 shows a reduction of less than 5° C.

6. A process for the preparation of the thermoplastic polymer composition (P) according to claim 1 , wherein the process comprises at least the following steps:
a) providing the components (A) and (B), and, when present, (C) and/or (D), in the predetermined amounts to an optionally heatable mixing device; and
b) blending the components (A) and (B), and, when present, (C) and/or (D), in the optionally heatable mixing device at temperatures above the glass transition temperature of the components (A) and (B), and, when present, (C) and/or (D), to obtain the thermoplastic polymer composition (P);

or wherein the process comprises at least the following steps:
a) providing the components (A), (B-1), and (B-2), and, when present, (B-3), (C), and/or (D), in the predetermined amounts to an optionally heatable mixing device; and
b) blending the components (A), (B-1), and (B-2), and, when present, (B-3), (C), and/or (D), in the optionally heatable mixing device at temperatures above the glass transition temperature of the components A), (B-1), and (B-2), and, when present, (B-3), (C), and/or (D), to obtain the thermoplastic polymer composition (P).

7. A molded article, prepared from the thermoplastic polymer composition (P) according to claim 1 .

8. A method of making components or articles for electronic devices, household goods, and automotive parts, comprising the thermoplastic polymer composition (P) according to claim 1 .

9. The thermoplastic polymer composition (P) according to claim 1 , wherein the copolymer composition (B) comprises as constituent (B-1) 77 to 92 wt.-%, based on the total weight of the copolymer composition (B), of at least one copolymer at least comprising repeating units derived from at least one a-olefin monomer and at least one vinyl-aromatic monomer.

10. The thermoplastic polymer composition (P) according to claim 1 , wherein copolymer composition (B) comprises as constituent (B-2) 3 to 10 wt.-%, based on the total weight of the copolymer composition (B), of at least one inorganic phosphate compound.

11. The thermoplastic polymer composition (P) according to claim 1 , wherein copolymer composition (B) comprises as constituent (B-3) 5 to 20 wt.-%, based on the total weight of the copolymer composition (B), of at least one polyolefin wax.

12. The thermoplastic polymer composition (P) according to claim 1 wherein the thermoplastic polymer composition (P) has a residual gloss of ≥25% after abrasion was effected according to norm PV3975 compared to the surface of the non-abraded thermoplastic polymer composition (P).

13. The thermoplastic polymer composition (P) according to claim 1 , wherein the thermoplastic polymer composition (P) has a residual gloss of ≥30% after abrasion was effected according to norm PV3975 compared to the surface of the non-abraded thermoplastic polymer composition (P).

14. The thermoplastic polymer composition (P) according to claim 4 , wherein the thermoplastic polymer composition (P) has a gloss reduction of less than 3% after grid cut test according to norm PV3952.

15. The thermoplastic polymer composition (P) according to claim 4 , wherein the thermoplastic polymer composition (P) has a gloss reduction of less than 1% after grid cut test according to norm PV3952.

16. The thermoplastic polymer composition (P) according to claim 5 , wherein the thermoplastic polymer composition (P) has a melt flow rate (MVR, 220/10), which is increased (improved) by a factor of at least 6.

17. The thermoplastic polymer composition (P) according to claim 5 , wherein VST B50 shows a reduction of less 3° C.

18. The thermoplastic polymer composition (P) according to claim 5 , wherein VST B50 shows a reduction of less 1° C.

19. A method of making components or articles for electronic devices, household goods, and automotive parts, comprising the molded article according to claim 7 .

20. The molded article according to claim 7 , wherein the molded article is a component or article for electronic devices, household goods, and automotive parts.

Assignees

• Ineos Styrolution Group Gmbh

Inventors

• Schulz Tobias
• Niessner Norbert
• Jahnke Eike
• Schmidt Hans-Werner
• Kolb Tristan

Classifications

• C08L91/06

  Waxes · CPC title

• C08L25/12 Primary

  with unsaturated nitriles · CPC title

• C08K2003/325

  Calcium, strontium or barium phosphate · CPC title

• C08L2205/03

  containing three or more polymers in a blend · CPC title

• C08L25/16

  Homopolymers or copolymers of alkyl-substituted styrenes · CPC title