Sulfur-modified chloroprene rubber, molding thereof, and production method therefore

• Main Authors: KABAYASHI NAOKI, SUZUKI RYOCHI, ABE YASUSHI, OSE MOTOHIRO
• Format: Patent
• Language: English
• Published: 03.05.2016
• Subjects: BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVINGPURPOSES; BLASTING; CHAINS; CHEMISTRY; COMPOSITIONS BASED THEREON; ENGINEERING ELEMENTS AND UNITS; FITTINGS PREDOMINANTLY USED THEREFOR; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; MECHANICAL ENGINEERING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; THERMAL INSULATION IN GENERAL; TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS; WEAPONS

Provided are a sulfur-modified chloroprene rubber with reduced exothermicity, a molding thereof, and a production method therefor. A sulfur-modified chloroprene rubber modified at the polymer terminals with at least one compound selected from tetramethylthiuram disulfide, tetraalkylthiuram disulfides with alkyl groups having a carbon number of 2 to 7 and dialkyldithiocarbamic acid salts with alkyl groups having a carbon number of 1 to 7, wherein there are peak tops at 3.55 to 3.61 ppm and at 3.41 to 3.47 ppm in 1H-NMR spectrum, as determined in deuterochloroform solvent, wherein the ratio (A/B) of the peak area (A) at 3.55 to 3.61 ppm to the peak area (B) at 4.2 to 6.5 ppm is 0.05/100 to 0.50/100, and the extract with ethanol/toluene azeotropic mixture, as specified by JIS K 6229, is 3.0 to 9.0 mass %.