Styrene copolymer composition with improved residual gloss
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.
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.