Thermoplastic resin composition having high durability

Abstract

The thermoplastic resin composition according to the present invention includes a thermoplastic resin (A), and a modified ethylene copolymer (B) dispersed and contained therein, wherein the modified ethylene copolymer (B) in the thermoplastic resin composition has an average dispersed particle aspect ratio of 1 to 3.5, and an average dispersed particle diameter of not more than 3 μm. The modified ethylene copolymer (B) is preferably a copolymer, modified with an unsaturated carboxylic acid or a derivative thereof, of ethylene with at least one monomer component selected from the group consisting of (i) olefin components except for ethylene, (ii) diene components and (iii) ester components having an ethylenically unsaturated group.

1 . A tube formed from a thermoplastic resin composition,
 the thermoplastic resin composition comprising a thermoplastic resin (A) and a modified ethylene copolymer (B), and obtained by dispersing the modified ethylene copolymer (B) into the thermoplastic resin (A),   the modified ethylene copolymer (B) in the thermoplastic resin composition having an average dispersed particle aspect ratio of 1 to 3.5, and an average dispersed particle diameter of not more than 3 μm.   
     
     
         2 . The tube according to  claim 1 , wherein the thermoplastic resin (A) is at least one selected from the group consisting of polyamide-based resins, polyester-based resins, polycarbonate-based resins and polyacetal resins. 
     
     
         3 . The tube according to  claim 1 , wherein the thermoplastic resin (A) is a thermoplastic elastomer (A1). 
     
     
         4 . The tube according to  claim 3 , wherein the thermoplastic elastomer (A1) is at least one selected from the group consisting of polyurethane-based thermoplastic elastomers (A11), polyester-based thermoplastic elastomers (A12) and polyamide-based thermoplastic elastomers (A13). 
     
     
         5 . The tube according to  claim 1 , wherein the modified ethylene copolymer (B) is a copolymer modified with an unsaturated carboxylic acid or a derivative thereof, the copolymer being a copolymer of ethylene with at least one monomer component selected from the group consisting of (i) olefin components except for ethylene, (ii) diene components and (iii) ester components having an ethylenically unsaturated group. 
     
     
         6 . The tube according to  claim 1 , wherein the modified ethylene copolymer (B) is an ethylene-propylene-diene copolymerized rubber modified with an unsaturated carboxylic acid or a derivative thereof. 
     
     
         7 . The tube according to  claim 1 , wherein a weight proportion [(B)/(A)] of the modified ethylene copolymer (B) to the thermoplastic resin (A) in the thermoplastic resin composition is in the range of 0.1/99.9 to 60/40. 
     
     
         8 . A tube formed from a thermoplastic resin composition as a thermoplastic elastomer alloy,
 the thermoplastic resin composition comprising a polyurethane-based thermoplastic elastomer (A11) and a modified ethylene-propylene-diene copolymerized rubber (B1), and obtained by dispersing the modified ethylene-propylene-diene copolymerized rubber (B1) into the polyurethane-based thermoplastic elastomer (A11).   
     
     
         9 . The tube according to  claim 8 , wherein a weight proportion [(B1)/(A11)] of the modified ethylene-propylene-diene copolymerized rubber (B1) to the polyurethane-based thermoplastic elastomer (A11) in the thermoplastic resin composition is in the range of 0.1/99.9 to 60/40. 
     
     
         10 . The tube according to  claim 8 , wherein the modified ethylene-propylene-diene copolymerized rubber (B1) in the thermoplastic elastomer alloy has an average dispersed particle aspect ratio of 1 to 3.5 and an average dispersed particle diameter of not more than 3 μm. 
     
     
         11 . A hose comprising a portion formed from a thermoplastic resin composition,
 the thermoplastic resin composition comprising a thermoplastic resin (A) and a modified ethylene copolymer (B), and obtained by dispersing the modified ethylene copolymer (B) into the thermoplastic resin (A),   the modified ethylene copolymer (B) in the thermoplastic resin composition having an average dispersed particle aspect ratio of 1 to 3.5, and an average dispersed particle diameter of not more than 3 μm.   
     
     
         12 . The hose according to  claim 11 , wherein the thermoplastic resin (A) is at least one selected from the group consisting of polyamide-based resins, polyester-based resins, polycarbonate-based resins and polyacetal resins. 
     
     
         13 . The hose according to  claim 11 , wherein the thermoplastic resin (A) is a thermoplastic elastomer (A1). 
     
     
         14 . The hose according to  claim 13 , wherein the thermoplastic elastomer (A1) is at least one selected from the group consisting of polyurethane-based thermoplastic elastomers (A11), polyester-based thermoplastic elastomers (A12) and polyamide-based thermoplastic elastomers (A13). 
     
     
         15 . The hose according to  claim 11 , wherein the modified ethylene copolymer (B) is a copolymer modified with an unsaturated carboxylic acid or a derivative thereof, the copolymer being a copolymer of ethylene with at least one monomer component selected from the group consisting of (i) olefin components except for ethylene, (ii) diene components and (iii) ester components having an ethylenically unsaturated group. 
     
     
         16 . The hose according to  claim 11 , wherein the modified ethylene copolymer (B) is an ethylene-propylene-diene copolymerized rubber modified with an unsaturated carboxylic acid or a derivative thereof. 
     
     
         17 . The hose according to  claim 11 , wherein a weight proportion [(B)/(A)] of the modified ethylene copolymer (B) to the thermoplastic resin (A) in the thermoplastic resin composition is in the range of 0.1/99.9 to 60/40. 
     
     
         18 . A hose comprising a portion formed from a thermoplastic resin composition as a thermoplastic elastomer alloy,
 the thermoplastic resin composition comprising a polyurethane-based thermoplastic elastomer (A11) and a modified ethylene-propylene-diene copolymerized rubber (B1), and obtained by dispersing the modified ethylene-propylene-diene copolymerized rubber (B1) into the polyurethane-based thermoplastic elastomer (A11).   
     
     
         19 . The hose according to  claim 18 , wherein a weight proportion [(B1)/(A11)] of the modified ethylene-propylene-diene copolymerized rubber (B1) to the polyurethane-based thermoplastic elastomer (A11) in the thermoplastic resin composition is in the range of 0.1/99.9 to 60/40. 
     
     
         20 . The hose according to  claim 18 , wherein the modified ethylene-propylene-diene copolymerized rubber (B1) in the thermoplastic elastomer alloy has an average dispersed particle aspect ratio of 1 to 3.5 and an average dispersed particle diameter of not more than 3 μm.