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

Patent metadata

Field	Value
Publication number	US-10163541-B2
Application number	US-201415029727-A
Country	US
Kind code	B2
Filing date	Oct 23, 2014
Priority date	Oct 24, 2013
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

Provided is a latex composition including a latex that includes a polymer having a tetrahydrofuran-insoluble component content of at least 1 mass % and no greater than 75 mass % and carbon nanotubes that have an average diameter (Av) and a diameter distribution (3σ) satisfying a relationship 0.60>3σ/Av>0.20. A composite material and a conductive formed product obtainable using the latex composition exhibit superior conductivity.

First claim

The invention claimed is:

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 %; and
carbon nanotubes having an average diameter Av and a diameter distribution 3σ satisfying a relationship 0.60>3σ/Av>0.20, 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 .

Assignees

• Zeon Corp

Inventors

• Shigeta Masahiro
• Uejima Mitsugu
• Hoang The Ban

Classifications

• Y10S977/742

  Carbon nanotubes, CNTs · CPC title

• C08K2201/003

  Additives being defined by their diameter · CPC title

• Y10S977/932

  for electronic or optoelectronic application · CPC title

• C08K2201/011

  Nanostructured additives · CPC title

• H01B1/04

  mainly consisting of carbon-silicon compounds, carbon or silicon · CPC title