Process for producing chloroprene elastomer
AssigneeDenki Kagaku Kogyo Kabushiki Kaisha
InventorsMichio Dohi, Takuji Sumida, Katsuichi Yokobori
Life of this patent
Estimating the term…
Abstract
A process for producing a chloroprene elastomer, which comprises copolymerizing in the presence of a radical catalyst 80 to 95 parts by weight of 2-chlorobutadiene-1,3 containing less than 0.95% by weight of 1-chlorobutadiene-1,3 with 5 to 20 parts by weight of 2,3-dichlorobutadiene-1,3 at a polymerization temperature of not higher than 20.degree. C in the presence of a mercaptan compound and a process for producing a vulcanized chloroprene rubber.
Claims11
A process for producing a chloroprene elastomer having excellent heat aging resistance, which comprises copolymerizing in the presence of a radical catalyst a mixture consisting of 80 to 95 parts by weight of 2-chlorobutadiene-1,3 containing less than 0.95% by weight of 1-chlorobutadiene-1,3 with 5 to 20 parts by weight of 2,3-dichlorobutadiene-1,3 at a polymerization temperature of not higher than 20.degree. C in the presence of a mercaptan compound.
A process for producing a vulcanized chloroprene rubber having excellent heat aging resistance, which comprises copolymerizing in the presence of a radical catalyst a mixture consisting of 80 to 95 parts by weight of 2-chlorobutadiene-1,3 containing less than 0.95% by weight of 1-chlorobutadiene-1,3 with 5 to 20 parts by weight of 2,3-dichlorobutadiene-1,3 at a polymerization temperature of not higher than 20.degree. C in the presence of a mercaptan compound to produce a chloroprene elastomer, preparing a rubber compounding of the chloroprene elastomer, and vulcanizing the rubber compounding.
Dependencies are inferred from the claim text.