Composite resin composition for automobile interior materials and automobile interior material manufactured using the same

1 . A composite resin composition, comprising:

15 to 20% by weight of a first vinyl cyanide compound-conjugated diene compound-aromatic vinyl compound copolymer, based on 100% by weight of a total of the composite resin composition;

9 to 15% by weight of a second vinyl cyanide compound-conjugated diene compound-aromatic vinyl compound copolymer, based on 100% by weight of a total of the composite resin composition;

32 to 40% by weight of an aromatic vinyl compound-vinyl cyanide compound copolymer, based on 100% by weight of a total of the composite resin composition; and

29 to 37% by weight of a polyester resin, based on 100% by weight of a total of the composite resin composition,

wherein an amount (%) of the aromatic vinyl compound comprised in the first vinyl cyanide compound-conjugated diene compound-aromatic vinyl compound copolymer is smaller than an amount (%) of the aromatic vinyl compound comprised in the second vinyl cyanide compound-conjugated diene compound-aromatic vinyl compound copolymer, wherein the intrinsic viscosity of the polyester resin is 1.1 to 1.3 dl/g, and wherein the vinyl cyanide compound comprised in the aromatic vinyl compound-vinyl cyanide compound copolymer is comprised in an amount of 26 to 29% by weight based on a total weight of the copolymer.

2 . The composite resin composition according to claim 1 , wherein a weight ratio of the second vinyl cyanide compound-conjugated diene compound-aromatic vinyl compound copolymer to the first vinyl cyanide compound-conjugated diene compound-aromatic vinyl compound copolymer is 1:1.37 to 1.66.

3 . The composite resin composition according to claim 1 , wherein the polyester resin is one or more selected from among polybutylene terephthalate (PBT), polyethylene adipate (PEA), polybutylene succinate (PBS), polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT) and polyethylene naphthalate (PEN).

4 . The composite resin composition according to claim 1 , wherein the composite resin composition has an L* value of 14.00 or less that is obtained by measuring light, reflected by a specimen obtained in an SCE manner, using an LAB colorimetric system.

5 . The composite resin composition according to claim 1 , wherein the first vinyl cyanide compound-conjugated diene compound-aromatic vinyl compound copolymer comprises 40 to 80% by weight of a diene rubber polymer having an average particle size of 100 to 500 nm, 10 to 40% by weight of an aromatic vinyl compound and 1 to 20% by weight of a vinyl cyanide compound, based on 100% by weight of copolymer.

6 . The composite resin composition according to claim 1 , wherein the second vinyl cyanide compound-conjugated diene compound-aromatic vinyl compound copolymer comprises 5 to 20% by weight of a diene rubber polymer having an average particle size of 800 to 10,000 nm, 50 to 85% by weight of an aromatic vinyl compound and 10 to 30% by weight of a vinyl cyanide compound, based on 100% by weight of a total of the composite resin composition.

7 . The composite resin composition according to claim 1 , wherein the aromatic vinyl compound-vinyl cyanide compound copolymer comprises 71 to 72% by weight of an aromatic vinyl compound and 28 to 29% by weight of a vinyl cyanide compound, based on 100% by weight of a total of the composite resin composition, and has a weight average molecular weight of 130,000 to 180,000 g/mol.

8 . The composite resin composition according to claim 1 , wherein the composite resin composition has a flow index of 25 g/10 min or more that is measured at 250° C. under a load of 5 kg according to ISO 1133.

9 . The composite resin composition according to claim 1 , wherein the composite resin composition has an Izod impact strength of 14 KJ/m 2 or more that is measured at 23° C. according to ISO 180/1A.

10 . The composite resin composition according to claim 1 , wherein a ⅛ inch specimen manufactured using the composite resin composition has a flexural modulus of 1950 MPa or more that is measured at a speed of 2 mm/min according to ISO 178.

11 . The composite resin composition according to claim 1 , wherein the composite resin composition has a high-load heat resistance of 75° C. or more that is measured under 1.82 MPa according to ISO 75.

12 . A method of preparing a composite resin composition, the method comprising:

feeding a mixture into an extruder, the mixture comprising:

15 to 20% by weight of a first vinyl cyanide compound-conjugated diene compound-aromatic vinyl compound copolymer, based on 100% by weight of a total of the composite resin composition;

9 to 15% by weight of a second vinyl cyanide compound-conjugated diene compound-aromatic vinyl compound copolymer, based on 100% by weight of a total of the composite resin composition; 32 to 40% by weight of an aromatic vinyl compound-vinyl cyanide compound copolymer, based on 100% by weight of a total of the composite resin composition; and 29 to 37% by weight of a polyester resin, based on 100% by weight of a total of the composite resin composition, and

melt-kneading and extruding the mixture,

wherein an amount (%) of the aromatic vinyl compound comprised in the first vinyl cyanide compound-conjugated diene compound-aromatic vinyl compound copolymer is smaller than an amount (%) of the aromatic vinyl compound comprised in the second vinyl cyanide compound-conjugated diene compound-aromatic vinyl compound copolymer,

wherein the intrinsic viscosity of the polyester resin is 1.1 to 1.3 dl/g, and wherein the vinyl cyanide compound comprised in the aromatic vinyl compound-vinyl cyanide compound copolymer is comprised in an amount of 26 to 29% by weight based on a total weight of the copolymer.

13 . An automobile interior product manufactured using the composite resin composition according to claim 1 .

14 . The automobile interior product according to claim 13 , wherein the automobile interior product is a floor console front tray or a cup holder.