Thermoplastic polymer composition and shaped article composed of the same

Abstract

Provided is a thermoplastic polymer composition, including a thermoplastic elastomer (A) and a polyvinyl acetal (B), wherein the thermoplastic elastomer (A) is a styrene-based thermoplastic elastomer or an olefin-based thermoplastic elastomer. Thus, a thermoplastic polymer composition is provided that has good flexibility as a thermoplastic elastomer composition, is excellent in mechanical properties and formability, and also itself has excellent adhesion to a ceramic, a metal, or a polar polymer. In addition, provided is a shaped article in which the thermoplastic polymer composition is adhered to a ceramic, a metal, or a polar polymer, in particular a shaped article adhered to a glass.

The invention claimed is: 
     
       1. A thermoplastic polymer composition, comprising a thermoplastic elastomer (A) and a polyvinyl acetal (B) wherein the polyvinyl acetal (B) is polyvinyl butyral, wherein the thermoplastic elastomer (A) is a hydrogenation product of a block copolymer having a polymer block of an aromatic vinyl compound and a polymer block of a conjugated diene compound, wherein the block copolymer contains from 5 to 75 weight % of structural units obtained from the aromatic vinyl compound based on a total weight of the block copolymer before hydrogenation, wherein the thermoplastic elastomer (A) is at least one member selected from the group consisting of polystyrene-polyisoprene-polystyrene block copolymers, polystyrene-poly(isoprene-butadiene)-polystryene block copolymers and polystyrene-polybutadiene-polystyrene block copolymers, and wherein the polyvinyl acetal (B) is contained in an amount from 5 to 70 parts by mass in terms of 100 parts by mass of the thermoplastic elastomer (A),
 wherein the thermoplastic elastomer (A) has a hydrogenation ratio of 70 mol % or more, 
 wherein particles of the polyvinyl acetal (B) are dispersed in a matrix of the thermoplastic elastomer (A), 
 wherein the thermoplastic polymer composition has a JIS-A hardness according to JIS K6253 of 93 or less. 
 
     
     
       2. The thermoplastic polymer composition according to  claim 1 , wherein the polyvinyl acetal (B) has an average particle diameter of 5 μm or less. 
     
     
       3. The thermoplastic polymer composition according to  claim 1 , wherein the polyvinyl acetal (B) is obtained by acetalizing polyvinyl alcohol having an average degree of polymerization of from 100 to 4000. 
     
     
       4. The thermoplastic polymer composition according to  claim 1 , wherein a degree of acetalization of the polyvinyl acetal (B) is from 55 to 88 mol %. 
     
     
       5. The thermoplastic polymer composition according to  claim 1 , wherein the thermoplastic elastomer (A) comprises both a thermoplastic elastomer (A1) not comprising a polar functional group and a thermoplastic elastomer (A2) comprising a polar functional group, and a ratio by weight of from 0.1/100 to 100/0.1. 
     
     
       6. A shaped article, comprising the thermoplastic polymer composition according to  claim 1 . 
     
     
       7. The shaped article according to  claim 6 , wherein the thermoplastic polymer composition is adhered to a ceramic or a metal. 
     
     
       8. The shaped article according to  claim 7 , wherein the thermoplastic polymer composition is adhered to a glass. 
     
     
       9. The shaped article according to  claim 7 , wherein a continuous layer of the polyvinyl acetal (B) exists at an interface between the thermoplastic polymer composition and the ceramic or the metal. 
     
     
       10. The shaped article according to  claim 6 , wherein the thermoplastic polymer composition is adhered to a polar polymer having a functional group selected from the group consisting of amide group, ester group, carbonate group, acetal group, ether group, sulfide group, nitrile group, hydroxyl group, carbonyl group, carboxyl group, amino group, and sulfonic acid group. 
     
     
       11. The shaped article according to  claim 10 , wherein the polar polymer is at least one selected from the group consisting of polyamide, polyester, polycarbonate, polyacetal, polyphenylene sulfide, ABS resin (acrylonitrile-butadiene-styrene copolymer), polyvinyl alcohol, ethylene-vinyl alcohol copolymer, polyvinyl acetal, polyvinyl acetate, poly(meth)acrylate, polyether, polyketone, ionomer, polyurethane, and polyurea. 
     
     
       12. An adhesive, comprising the thermoplastic polymer composition according to  claim 1 .