Polyolefin resin composition

Abstract

Provided: polyolefin resin composition excellent in antistatic properties with sufficient persistence and wiping resistance, without impairment of intrinsic mechanical properties; and an automotive interior/exterior material containing the same. The polyolefin resin composition contains: 50 to 90 parts by mass of polyolefin resin; 3 to 40 parts by mass of thermoplastic elastomer; 3 to 30 parts by mass of filler, and an antistatic agent of a polymer compound (E) in an amount of 3 to 20 parts by mass with respect to a total amount of 100 parts by mass of the polyolefin resin, thermoplastic elastomer and filler, wherein the polymer compound (E) has a structure in which a diol, an aliphatic dicarboxylic acid, an aromatic dicarboxylic acid, a compound (B) containing at least one group of Formula (1) and having hydroxyl groups at both ends, and an epoxy compound (D) having two or more epoxy groups are bound via ester bonds: —CH 2 —CH 2 —O—  (1).

The invention claimed is: 
     
       1. A polyolefin resin composition comprising:
 50 to 90 parts by mass of a polyolefin resin; 
 3 to 40 parts by mass of a thermoplastic elastomer; and 
 3 to 30 parts by mass of a filler with a proviso that the total amount of said polyolefin resin, said thermoplastic elastomer and said filler is 100 parts by mass, 
 said polyolefin resin composition further comprising an antistatic agent composed of a polymer compound (E) in an amount of 3 to 20 parts by mass with respect to said total amount of 100 parts by mass of said polyolefin resin, said thermoplastic elastomer and said filler, 
 wherein said polymer compound (E) has a structure in which a diol, an aliphatic dicarboxylic acid, an aromatic dicarboxylic acid, a compound (B) which comprises at least one group represented by the following Formula (1) and has hydroxyl groups at both ends, and an epoxy compound (D) having two or more epoxy groups are bound via ester bonds:
   —CH 2 —CH 2 —O—  (1).
 
 
 
     
     
       2. The polyolefin resin composition according to  claim 1 , wherein said polymer compound (E) has a structure in which a polyester (A), which is constituted by a diol, an aliphatic dicarboxylic acid and an aromatic dicarboxylic acid, said compound (B) and said epoxy compound (D) are bound via ester bonds. 
     
     
       3. The polyolefin resin composition according to  claim 2 , wherein said polymer compound (E) has a structure in which a block polymer (C) having carboxyl groups at both ends and said epoxy compound (D) are bound via an ester bond, said block polymer (C) comprising a block constituted by said polyester (A) and a block constituted by said compound (B) that are repeatedly and alternately bound via ester bonds. 
     
     
       4. The polyolefin resin composition according to  claim 3 , wherein, in said polymer compound (E), said block constituted by said polyester (A) has a number-average molecular weight of 800 to 8,000 in terms of polystyrene, said block constituted by said compound (B) has a number-average molecular weight of 400 to 6,000 in terms of polystyrene, and said block polymer (C) has a number-average molecular weight of 5,000 to 25,000 in terms of polystyrene. 
     
     
       5. The polyolefin resin composition according to  claim 2 , wherein said polyester (A) constituting said polymer compound (E) has a structure comprising carboxyl groups at both ends. 
     
     
       6. The polyolefin resin composition according to  claim 1 , wherein said compound (B) constituting said polymer compound (E) is a polyethylene glycol. 
     
     
       7. The polyolefin resin composition according to  claim 1 , further comprising at least one selected from the group consisting of alkali metal salts and Group II element salts in an amount of 0.1 to 15 parts by mass with respect to said total amount of 100 parts by mass of said polyolefin resin, said thermoplastic elastomer and said filler. 
     
     
       8. The polyolefin resin composition according to  claim 1 , wherein said polyolefin resin has a melt flow rate in a range of 5 to 100 g/10 min. 
     
     
       9. An automotive interior/exterior material obtained by molding the polyolefin resin composition according to  claim 1 .