Thermoplastic polymer composition and molded article

Abstract

The present invention is a thermoplastic polymer composition which contains 10-120 parts by mass of a polar group-containing polypropylene resin (B) per 100 parts by mass of a thermoplastic elastomer (A) that is a block copolymer having a polymer block containing an aromatic vinyl compound unit and a polymer block composed of a conjugated diene unit having 40% by mole or more of 1,2-bonds and 3,4-bonds in total, or a hydrogenated product of the block copolymer (provided that a thermoplastic polymer composition containing 1 part by mass or more of a polyvinyl acetal resin is excluded). This thermoplastic polymer composition is able to be bonded with a ceramic, a metal or a synthetic resin without requiring a primer treatment, and has excellent flexibility, mechanical characteristics, moldability, heat resistance and storage stability.

1 . A thermoplastic polymer composition comprising from 10 to 120 parts by mass of a polar group-containing polypropylene resin (B) with respect to 100 parts by mass of a thermoplastic elastomer (A),
 wherein thermoplastic elastomer (A) is a block copolymer comprising a polymer block comprising aromatic vinyl compound units and a polymer block comprising conjugated diene compound units having a total amount of 1,2-bonds and 3,4-bonds of 40 mol % or more, or a hydrogenated product of the block copolymer, and   provided that a thermoplastic polymer composition containing 1 part by mass or more of a polyvinyl acetal resin is excluded.   
     
     
         2 . The thermoplastic polymer composition according to  claim 1 , wherein the conjugated diene compound units are isoprene units. 
     
     
         3 . The thermoplastic polymer composition according to  claim 1 , wherein said thermoplastic polymer composition comprises 10 to 100 parts by mass of the polar group-containing polypropylene resin (B) with respect to 100 parts by mass of the thermoplastic elastomer (A). 
     
     
         4 . The thermoplastic polymer composition according to  claim 1 , wherein the thermoplastic elastomer (A) has a weight average molecular weight (Mw) of from 70,000 to 200,000, and is a linear block copolymer. 
     
     
         5 . The thermoplastic polymer composition according to  claim 1 , further comprising a tackifier resin (C) of from 1 to 100 parts by mass per 100 parts by mass of the thermoplastic elastomer (A). 
     
     
         6 . The thermoplastic polymer composition according to  claim 1 , wherein the polar group-containing polypropylene resin (B) is a carboxylic acid-modified polypropylene resin. 
     
     
         7 . A molded article comprising the thermoplastic polymer composition of  claim 1 . 
     
     
         8 . The molded article according to  claim 7 , wherein the thermoplastic polymer composition is adhered to a first ceramic, metal and/or synthetic resin. 
     
     
         9 . The molded article according to  claim 8 , further comprising a second ceramic, metal or synthetic resin, wherein the second ceramic, metal or synthetic resin is adhered to the first ceramic, metal, or synthetic resin via the thermoplastic polymer composition. 
     
     
         10 . A method for producing a molded article prepared from a thermoplastic polymer composition by insert molding, the method comprising
 filling a mold holding an insert part with the thermoplastic polymer composition of  claim 1 , and   molding the thermoplastic polymer composition, wherein a temperature of the insert part during the insert molding is from 30 to 150° C.   
     
     
         11 . The method for producing the molded article according to  claim 10 , wherein the insert part is a ceramic, a metal and/or a synthetic resin. 
     
     
         12 . The thermoplastic polymer composition of  claim 1  further comprising a softener, a plasticizer, an inorganic filler, an antioxidant, a lubricant, a light stabilizer, a processing aid, a coloring agent such as a pigment or a dye, a flame retardant, an antistatic agent, a matting agent, a silicone oil, a blocking inhibitor, an ultraviolet absorber, a release agent, a foaming agent, an antibacterial agent, an anti-mold agent, and/or a perfume. 
     
     
         13 . The thermoplastic polymer composition of  claim 1  wherein the A hardness is from 35 to 85. 
     
     
         14 . The thermoplastic polymer composition of  claim 1  wherein the melt flow rate at 230° C. and a load of 21.18N is from 2 to 30 g/10 min. 
     
     
         15 . The thermoplastic polymer composition according to  claim 1  wherein the thermoplastic elastomer (A) has a weight average molecular weight (Mw) of from 80,000 to 180,000, and is a linear block copolymer.