SULFUR MODIFIED CHLOROPRENE RUBBER AND METHOD FOR PRODUCING SAME, AND MOLDED BODY
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United States of America Patent
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Issued Date -
Nov 27, 2014
app pub date -
Dec 7, 2012
filing date -
Jan 13, 2012
priority date (Note) -
Abandoned
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Abstract
Provided are a sulfur-modified chloroprene rubber superior in adhesiveness to cable core and fibrous reinforcement material, a method for producing the same, and a molded body prepared from the same. A sulfur-modified chloroprene rubber is prepared in a polymerization step of mixing 100 parts by mass of 2-chloro-1,3-butadiene and 0.1 to 2.0 parts by mass of sulfur and emulsion-polymerizing the mixture to a monomer conversion rate in the range of 60 to 90% and in a plasticizing step of modifying the terminal of the polymer by adding an aqueous medium dispersion containing tetramethylthiuram disulfide in an amount of 10 to 70 mass % to the reaction solution after polymerization. The 1H-NMR spectrum of the sulfur-modified chloroprene rubber, as determined in deuterochloroform solvent, has two peak tops at 3.55 to 3.61 ppm and at 3.41 to 3.47 ppm, and the ratio (A/B) of peak area (A) at 3.55 to 3.61 ppm to peak area (B) at 4.2 to 6.5 ppm is 0.05/100 to 0.70/100.
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