Thermoplastic resin composition having high durability

• US 9,862,825 B2
• Filed: 03/29/2012
• Issued: 01/09/2018
• Est. Priority Date: 03/31/2011
• Status: Active Grant

• Current Assignee: Nitta Corporation
• Original Assignee: Nitta Corporation
• Inventors: Kasazaki, Toshiaki, Yoshida, Takahiko, Shimizu, Shoji, Uegaki, Shinsuke, Onishi, Yoko
• Primary Examiner(s): Dollinger, Mike M
• Application Number:
  US14/007,931
• Publication Number:
  US 20140017429A1
• Time in Patent Office: 2,112 Days
• Field of Search: 428 364
• CPC Class Codes: B65G 15/32 made of rubber or plastics
• CPC Class Codes: C08G 18/4277 Caprolactone and/or substituted caprolactone
• CPC Class Codes: C08G 18/4854 Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group
• CPC Class Codes: C08G 2350/00 Acoustic or vibration damping material
• CPC Class Codes: C08G 2380/00 Tyres
• CPC Class Codes: C08G 2410/00 Soles
• CPC Class Codes: C08G 69/40 Polyamides containing oxygen in the form of ether groups C08G69/12, C08G69/32 take precedence
• CPC Class Codes: C08G 69/44 Polyester-amides
• CPC Class Codes: C08L 101/00 Compositions of unspecified macromolecular compounds
• CPC Class Codes: C08L 2207/04 Thermoplastic elastomer
• CPC Class Codes: C08L 23/0869 Acids or derivatives thereof
• CPC Class Codes: C08L 23/16 Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
• CPC Class Codes: C08L 23/26 modified by chemical after-treatment
• CPC Class Codes: C08L 53/025 modified
• CPC Class Codes: C08L 67/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds C08L67/06 takes precedence
• CPC Class Codes: C08L 67/025 containing polyether sequences
• CPC Class Codes: C08L 75/04 Polyurethanes
• CPC Class Codes: C08L 75/06 from polyesters
• CPC Class Codes: C08L 75/08 from polyethers
• CPC Class Codes: C08L 75/12 from compounds containing nitrogen and active hydrogen, the nitrogen atom not being part of an isocyanate group
• CPC Class Codes: C08L 77/02 : Polyamides derived from omega-amino carboxylic acids or from lactams thereof C08L77/10 takes precedence
• CPC Class Codes: C08L 77/06 : Polyamides derived from polyamines and polycarboxylic acids C08L77/10 takes precedence
• CPC Class Codes: C08L 77/12 : Polyester-amides
• CPC Class Codes: F16G 1/14 : made of plastics F16G1/28 takes precedence ; consisting of several parts F16G1/22; making thereof B29D29/00
• CPC Class Codes: Y10T 428/1372 : Randomly noninterengaged or randomly contacting fibers, filaments, particles, or flakes

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.

Claims

1. A thermoplastic resin composition is a thermoplastic elastomer alloy, wherein the thermoplastic elastomer alloy comprises a polyurethane-based thermoplastic elastomer (A11) and a modified ethylene-propylene-diene copolymerized rubber (B1), and is obtained by dispersing the modified ethylene-propylene-diene copolymerized rubber (B1) into the polyurethane-based thermoplastic elastomer (A11),

wherein the polyurethane-based thermoplastic elastomer (A11) is at least one selected from the group consisting of adipate-based thermoplastic polyurethanes, caprolactone-based thermoplastic polyurethanes, and polytetramethylene ether glycol-based thermoplastic polyurethanes, and forms a continuous phase in the thermoplastic elastomer alloy,

wherein the modified ethylene-propylene-diene copolymerized rubber (B1) is a maleic anhydride-modified ethylene-propylene-diene copolymerized rubber, and forms a disperse phase in the thermoplastic elastomer alloy,

wherein a content rate of the modified ethylene-propylene-diene copolymerized rubber (B1) is 30 to 60 wt % based on the total content of the polyurethane-based thermoplastic elastomer (A11) and the modified ethylene-propylene-diene copolymerized rubber (B1).

2. The thermoplastic resin composition according to claim 1, 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 μ

m.

3. The thermoplastic resin composition according to claim 1, wherein a content rate of the modified ethylene-propylene-diene copolymerized rubber (B1) is 50 to 60 wt % based on the total content of the polyurethane-based thermoplastic elastomer (A11) and the modified ethylene-propylene-diene copolymerized rubber (B1).

4. The thermoplastic resin composition according to claim 2, wherein a content rate of the modified ethylene-propylene-diene copolymerized rubber (B1) is 50 to 60 wt % based on the total content of the polyurethane-based thermoplastic elastomer (A11) and the modified ethylene-propylene-diene copolymerized rubber (B1).

5. The thermoplastic resin composition according to claim 1, wherein the modified ethylene-propylene-diene copolymerized rubber (B1) in the thermoplastic elastomer alloy has an average dispersed particle aspect ratio of 1.08 to 3.5 and an average dispersed particle diameter of not more than 3 μ

m.