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.

Description

TECHNICAL FIELD[0001]The present invention relates to a thermoplastic polymer composition that can be adhered to a ceramic, a metal or a synthetic resin without performing a primer treatment or the like and has excellent flexibility, mechanical properties, moldability, heat resistance and storage stability, and a molded article thereof, and also relates to a method for producing the molded article, particularly a molded article in which the thermoplastic polymer composition is adhered to a ceramic, a metal or a synthetic resin, by insert molding.BACKGROUND ART[0002]Ceramics, metals and synthetic resins, having excellent durability, heat resistance and mechanical strength are widely used in various uses such as household appliances, electronic parts, machine parts and automobile parts. Those members are sometimes used by adhering to or combining with an elastomer member having excellent flexibility for the purpose of fixing to other structural member or for the purpose of shock absor...

AI Technical Summary

Benefits of technology

The present invention is for a thermoplastic elastomer that includes a polymer block containing aromatic vinyl compound units and a polymer block containing conjugated diene compound units. The proportions of these blocks may vary, but they should make up at least 20% of the elastomer. The polymer blocks can have other copolymerizable monomer units, such as 1-butene, pentene, hexene, butadiene, isoprene, and methyl vinyl ether. The amount of codopolymerizable monomer should not exceed 70%, based on the total structural units of the polymer blocks. The polymer blocks can have a specific bonding form, with 1,4-bonds and 1,2-bonds being the most important. The bonding form between the blocks is not limited, but a linear pattern is preferred. The elastomer has good heat resistance and can be used as a thermoplastic elastomer in various applications.

Problems solved by technology

However, the styrenic thermoplastic elastomer is a material having low polarity, and its adhesive force to a ceramic, a metal or the like is not sufficient, and the styrenic thermoplastic elastomer has a problem that melting adhesion is difficult as it is.

However, the methods disclosed in Patent Documents 1 to 6 have the problems that not only steps are complicated, but productivity is decreased and production costs are increased.

Images