Hydrogenated block copolymer, resin composition, pressure-sensitive adhesive, adhesive, molded object, liquid-packaging container, medical tool, medical tube, corner member for weather seal, and weather seal

Abstract

Provided are a hydrogenated block copolymer capable of giving a resin composition having good moldability and sufficient mechanical strength and excellent in flexibility, kink resistance and transparency and also excellent in pressure sensitive adhesiveness, adhesiveness and weather resistance, and a resin composition containing the hydrogenated block copolymer, as well as a pressure sensitive adhesive, an adhesive, a molded article, a liquid-packaging container, a medical tool, a medical tube, a corner member for weather seal, and a weather seal that are produced using these. Specifically, the hydrogenated block copolymer is a hydrogenated block copolymer prepared by hydrogenating a block copolymer that contains at least a polymer block (A) consisting mainly of a structural unit derived from an aromatic vinyl compound, and a polymer block (B) consisting mainly of a structural unit derived from isoprene, a structural unit derived from butadiene, or a structural unit derived from a mixture of isoprene and butadiene, wherein the content of the polymer block (A) is 1% by mass or more and less than 5% by mass relative to the total amount of the hydrogenated block copolymer, the total content of the 1,2-bond and the 3,4-bond of the polymer block (B) is 30 to 85 mol %, the hydrogenation rate of the polymer block (B) is 80 mol % or more, and the weight average molecular weight of the hydrogenated block copolymer is 150,000 to 800,000.

1 . A hydrogenated block copolymer obtained by hydrogenating a block copolymer that comprises at least a polymer block (A) mainly comprising a structural unit derived from an aromatic vinyl compound, and a polymer block (B) mainly comprising a structural unit derived from isoprene, a structural unit derived from butadiene, or a structural unit derived from a mixture of isoprene and butadiene, wherein:
 a content of the polymer block (A) is 1% by mass or more and less than 5% by mass relative to a total amount of the hydrogenated block copolymer,   a total content of the 1,2-bond and the 3,4-bond in the polymer block (B) is from 30 to 85 mol %,   a hydrogenation rate of the polymer block (B) is 80 mol % or more, and   a weight average molecular weight of the hydrogenated block copolymer is from 150,000 to 800,000.   
     
     
         2 . The hydrogenated block copolymer according to  claim 1 , wherein a weight average molecular weight of at least one polymer block (A) of the polymer block (A) is from 3,000 to 15,000. 
     
     
         3 . The hydrogenated block copolymer according to  claim 1 , wherein a weight average molecular weight of at least one polymer block (A) of the polymer block (A) is from 300 to 2,500. 
     
     
         4 . The hydrogenated block copolymer according to  claim 1 , wherein a total weight average molecular weight of the polymer block (A) is 3,500 to 15,000. 
     
     
         5 . The hydrogenated block copolymer according to  claim 1 , wherein a total weight average molecular weight of the polymer block (A) is 4,500 to 15,000. 
     
     
         6 . The hydrogenated block copolymer according to  claim 1 , which is a linear triblock copolymer or diblock copolymer. 
     
     
         7 . The hydrogenated block copolymer according to  claim 6 , which is a triblock copolymer comprising two above polymer blocks (A) and one above polymer block (B) of a type of A-B-A, wherein (A is the polymer block (A) and B is the polymer block (B). 
     
     
         8 . The hydrogenated block copolymer according to  claim 1 , wherein the polymer block (B) is a polymer block mainly comprising a structural unit derived from a mixture of isoprene and butadiene, and the blending ratio of isoprene and butadiene is, as a molar ratio, isoprene/butadiene=10/90 to 90/10. 
     
     
         9 . A resin composition, comprising:
 (a) the hydrogenated block copolymer according to  claim 1 ; and   (b) a polyolefinic resin,   wherein a content ratio of the component (a) to the component (b) is, as a ratio by mass, from 1/99 to 99/1.   
     
     
         10 . The resin composition according to  claim 9 , wherein the component (a) comprises a hydrogenated block copolymer in which a total weight average molecular weight of the polymer block (A) is 3,500 to 7,000 and a hydrogenated block copolymer in which the total weight average molecular weight of the polymer block (A) is more than 7,000 and 15,000 or less. 
     
     
         11 . The resin composition according to  claim 9 , wherein the olefin that constitutes the component (b) is an olefin having 2 to 10 carbon atoms. 
     
     
         12 . The resin composition according to  claim 9 , wherein the component (b) is a polypropylenic resin selected from the group consisting of a homopolypropylene, a propylene-ethylene random copolymer, a propylene-ethylene block copolymer, a propylene-butene random copolymer, a propylene-ethylene-butene random copolymer, a propylene-pentene random copolymer, a propylene-hexene random copolymer, a propylene-octene random copolymer, a propylene-ethylene-pentene random copolymer and a propylene-ethylene-hexene random copolymer. 
     
     
         13 . The resin composition according to  claim 9 , wherein the component (b) is a polyolefinic resin comprising a polar group. 
     
     
         14 . The resin composition according to  claim 13 , wherein the polar group is at least one selected from the group consisting of a (meth)acryloyloxy group, a hydroxy group, an amide group, a halogen atom, a carboxy group, an ester group represented by —COOR, wherein R is an alkyl group having 1 to 10 carbon atoms or an aryl group having 6 to 20 carbon atoms, and an acid anhydride group. 
     
     
         15 . A pressure sensitive adhesive, comprising the hydrogenated block copolymer according to  claim 1 . 
     
     
         16 . An adhesive, comprising the resin composition according to  claim 9 . 
     
     
         17 . A molded article, comprising:
 at least one selected from the group consisting of a ceramic, a metal, a polar resin and a polyolefinic resin; and   the adhesive according to  claim 16 .   
     
     
         18 . A liquid-packaging container, comprising a layer comprising the resin composition according to  claim 9 . 
     
     
         19 . The liquid-packaging container according to  claim 18 , comprising a laminate of at least three layers comprising an inner layer, a middle layer and an outer layer, wherein at least one layer of the inner layer, the middle layer and the outer layer comprises the resin composition. 
     
     
         20 . The liquid-packaging container according to  claim 19 , wherein both the inner layer and the middle layer or any one layer of the inner layer or the middle layer comprises the resin composition, and wherein:
 the melting point MP in  of the resin component constituting the inner layer and the melting point MP mid  of the resin component constituting the middle layer satisfy the following expression:
   MP in <MP mid . 
   
     
     
         21 . The liquid-packaging container according to  claim 19 , wherein the inner layer comprises the resin composition, and the melting point MP in  of the resin component constituting the inner layer and the melting point MP out  of the resin component constituting the outer layer satisfy the following expression:
   0< MP   out   −MP   in ≦50.
   
     
     
         22 . The liquid-packaging container according to  claim 19 , wherein at least the inner layer comprises the resin composition. 
     
     
         23 . The liquid-packaging container according to  claim 19 , wherein a thickness of each layer is from 5 to 30 μm of the inner layer, from 100 to 300 μm of the middle layer, and from 15 to 120 μm of the outer layer. 
     
     
         24 . A medical tool, comprising the resin composition according to  claim 9 . 
     
     
         25 . A medical tube, comprising the resin composition according to  claim 9 . 
     
     
         26 . A resin composition, comprising:
 (I) the hydrogenated block copolymer according to  claim 1 ;   (II) a polyolefinic resin: and   (III) a softening agent.   
     
     
         27 . A corner member, comprising a part comprising the resin composition according to  claim 26 . 
     
     
         28 . A weather seal, comprising a member that has a part comprising the resin composition according to  claim 26 .