Acrylonitrile-butadiene-styrene copolymer composition with high surface energy

1. A polymer composition (P), consisting of:

(A) 20-40 parts by weight of at least one acrylonitrile-butadiene-styrene copolymer (ABS copolymer (A));

(B) 60-80 parts by weight of at least one styrene acrylonitrile copolymer (SAN copolymer);

(C) 1-5 parts by weight, based on 100 parts by weight of the polymeric compounds (A) and (B), of at least one additive (C) having a high surface energy; and

(D) 1-10 parts by weight, based on 100 parts by weight of the polymeric compounds (A) and (B), of further additives,

wherein the surface energy of the polymer composition (P) is ≥41 mN/m, and

wherein the at least one additive (C) consists of:

(C-1) at least one composition consisting of at least one di-acid ester compound and at least one compound having at least one siloxane repeating unit wherein the at least one di-acid ester is a compound represented by the general formula (Ia):

wherein R 1 and R 2 are independently selected from a linear or branched C 1 -C 30 alkyl group, a linear or branched C 2 -C 30 alkenyl group, a C 5 -C 30 cycloalkyl group and a C 6 -C 30 aryl group, each of which may optionally be substituted with one or more functional groups selected from epoxy groups, anhydride groups, carboxyl groups, ester groups, acrylate groups, and nitrile groups;

Q represents a divalent linear or branched hydrocarbon group having 1 to 20 carbon atoms; and

m is an integer from 1 to 5,

and the at least one siloxane compound is a glycidyl ether terminated siloxane of general formula (IIb):

wherein R 3 and R 4 are independently selected from a linear or branched C 1 -C 10 alkyl group and a linear or branched C 1 -C 10 alkoxy group, each of which may optionally be substituted with one or more epoxy groups,

R 6 is selected from a linear or branched C 1 -C 10 alkyl group and a linear or branched C 1 -C 10 alkyl glycidyl ether,

n represents an integer from 1 to 20, and

k represents 0 or 1.

2. The polymer composition (P) according to claim 1 , wherein the polymer composition (P) consists of 1 to 2 parts by weight, based on 100 parts by weight of the polymeric compounds (A) and (B), of additive (C).

3. The polymer composition (P) according to claim 1 , wherein the at least one ABS copolymer (A) is obtained using an agglomerated butadiene rubber latex having a weight average particle diameter D w of 200 to 500 nm.

4. A process for preparing a polymer composition (P) according to claim 1 , wherein the process comprises the steps:

a) mixing the components (A) to (D) in the predetermined amounts to obtain a homogenous particulate material mixture; and

b) extruding the homogenous particulate material mixture at temperatures above the glass transition point of the components (A) to (D) to obtain the polymer composition (P).

5. A polymer moulded article, comprising at least one polymer composition (P) according to claim 1 .

6. A process for painting a surface of the polymer moulded article according to claim 5 , wherein no pre-treatment of the surface of the polymer moulded article prior to the application of the paint is required.

7. The process according to claim 6 , the process comprising the steps:

a) cleaning the surface of the polymer moulded article;

b) optionally roughening the surface of the polymer moulded article;

c) applying at least one layer of paint to the surface of the polymer moulded article; and

d) drying the paint;

wherein no pre-treatment of the surface of the polymer moulded article is required prior to the application of the paint.