Latex composition, production method therefor, composite material, and conductive formed product

Abstract

Provided is a latex composition consists of a latex including a polymer having a tetrahydrofuran-insoluble component content of at least 5 mass % and no greater than 75 mass %; carbon nanotubes having an average diameter Av and a diameter distribution 3σ satisfying a relationship 0.60>3σ/Av>0.20; and an additive selected from the group consisting of a dispersant, a cross-linking agent, a plasticizer, an antioxidant, a heat stabilizer, a light stabilizer, an ultraviolet absorber, a pigment, a colorant, a foaming agent, a flame retardant, a lubricant, a softener, a tackifier, a mold release agent, a deodorant, and a perfume. The carbon nanotubes have a specific surface area of at least 600 m2/g, and in a Raman spectrum of the carbon nanotubes, a ratio of G band peak intensity relative to D band peak intensity (G/D ratio) is at least 1 and no greater than 20.

1 . A latex composition consisting of:
 a latex including a polymer having a tetrahydrofuran-insoluble component content of at least 5 mass % and no greater than 75 mass %;   carbon nanotubes having an average diameter Av and a diameter distribution 3σ satisfying a relationship 0.60 >3σ/Av>0.20; and   an additive selected from the group consisting of a dispersant, a cross-linking agent, a plasticizer, an antioxidant, a heat stabilizer, a light stabilizer, an ultraviolet absorber, a pigment, a colorant, a foaming agent, a flame retardant, a lubricant, a softener, a tackifier, a mold release agent, a deodorant, and a perfume, wherein   the carbon nanotubes have a specific surface area of at least 600 m 2 /g, and   in a Raman spectrum of the carbon nanotubes, a ratio of G band peak intensity relative to D band peak intensity (G/D ratio) is at least 1 and no greater than 20.   
     
     
         2 . The latex composition of  claim 1 , wherein
 the carbon nanotubes constitute no greater than 10 parts by mass per 100 parts by mass of the polymer.   
     
     
         3 . The latex composition of  claim 1 , wherein
 the polymer is a conjugated diene rubber.   
     
     
         4 . A latex composition production method for producing the latex composition of  claim 1  comprising
 blending a dispersion liquid of carbon nanotubes having an average diameter Av and a diameter distribution 3σ satisfying a relationship 0.60>3σ/Av>0.20 with a latex including a polymer having a tetrahydrofuran-insoluble component content of at least 5 mass % and no greater than 75 mass %, wherein 
 the carbon nanotubes have a specific surface area of at least  600  m 2 /g, and 
 in a Raman spectrum of the carbon nanotubes, a ratio of G band peak intensity relative to D band peak intensity (G/D ratio) is at least 1 and no greater than 20. 
 
     
     
         5 . The latex composition production method of  claim 4 , further comprising
 preparing the dispersion liquid of the carbon nanotubes by dispersing carbon nanotubes having an average diameter Av and a diameter distribution 3σ satisfying a relationship 0.60>3σ/Av>0.20 in a solvent through dispersion treatment that brings about a cavitation effect, wherein the carbon nanotubes have a specific surface area of at least 600 m 2 /g, and   in a Raman spectrum of the carbon nanotubes, a ratio of G band peak intensity relative to D band peak intensity (G/D ratio) is at least 1 and no greater than 20.   
     
     
         6 . The latex composition production method of  claim 5 , wherein
 the dispersion treatment is one or more dispersion treatments selected from the group consisting of dispersion treatment using ultrasound, dispersion treatment using a jet mill, and dispersion treatment using high-shear stirring.   
     
     
         7 . A composite material obtainable using the latex composition of  claim 1 . 
     
     
         8 . A conductive formed product formable by forming the composite material of  claim 7 .