Abstract: An excellent cold-proof chlorosulfonated polyethylene and a method of manufacturing the same featured in that a polyethylene is once dissolved in a solvent by heating up them over a dissolution temperature of the polyethylene, then cooled and thus obtained homogeneous solution of the polyethylene is allowed to react with a sulfuryl chloride in the presence of a catalyst of a radical generating agent in the dissolution temperature region of the polyethylene or in a temperature region lower than the former one.

Abstract: Disclosed is a wipe-erasable ink composition for a writing board, which has good erasability and long-period stability. This ink composition comprises a colored polymer formed by dyeing an organic solvent-soluble resin having a sulfonic acid group or a salt thereof with a basic dye, a volatile organic solvent and, as additives, (A) a nonionic surface active agent having an HLB value of 8 to 14 and/or a cationic organic compound, and (B) a slightly volatile or nonvolatile organic compound.

Abstract: A method for producing chlorosulfonated polyethylene with controlled addition of the amount of sulfur added to the polyethylene. Polyethylene dissolved in halogenated hydrocarbon is reacted with sulfuryl chloride in the presence of a catalyst of a radical generating agent in a binary phase system. The addition amount of sulfur is controlled by adding an amine compound to the reaction in an amount within the range where the following formula is applicable:log.sub.10 S=.alpha..multidot.log.sub.10 A+.beta. (1)whereinS: reaction yield (%) of sulfur of sulfuryl chlorideA: concentration (mol/liter) of amine compound in halogenated hydrocarbon solvent.alpha.,.beta.: constants such that1.0<.alpha.<3.04.0<.alpha.<12.0.

Abstract: A granular composition of ethylenethiourea-chloroprene rubber is produced by adding dropwise a mixture of chloroprene rubber latex and ethylenethiourea at a ratio of 5-100 wt. % per rubber of said rubber latex and a macromolecular polyanion having carboxyl group or hydroxyl group at a ratio of 2-8 wt. % per rubber of said rubber latex lower than 10.degree. C. into an aqueous solution containing at least one of alkaline earth metal salt at lower than 10.degree. C. for form granule and then, dehydrating and drying the granule.

Abstract: Chlorosulfonated polyethylene having excellent properties as elastomer is produced by dissolving polyethylene in a mixed solvent of carbon tetrachloride and a halogenated aromatic compound such as, for example, chlorobenzene and reacting polyethylene with chlorine and sulfuryl chloride or with sulfuryl chloride.

Abstract: A process for preparing a rubber-asphalt composition, which comprises blending a particulate or powdery rubber composition comprising 100 parts by weight of a particulate or powdery rubber having a particle size of at most 2 mm and from 0.1 to 50 parts by weight of a particulate or powdery blowing agent having a particle size of at most 1 mm, with asphalt containing from 0.1 to 30 parts by weight of an organic base, based on 100 parts by weight of the asphalt.

Abstract: This invention relates to a method for manufacturing a granular organic rubber composition which is useful for a vulcanizing agent, a vulcanization accelerator and antioxidant etc. by contacting an organic rubber chemical mixture comprising a rubber chemical, a liquid polybutene, a nonionic or anionic surface active agent and a water-soluble anionic macromolecule with an aqueous solution containing an alkaline earth metal salt and/or a zinc salt.

Abstract: A chloroprene polymer composition comprises a benzene soluble chloroprene polymer (A) and a gel chloroprene polymer (B) at a ratio ranging from 20:1 to 1:1, wherein the benzene soluble chloroprene polymer (A) is obtained by an aqueous emulsion polymerization of chloroprene or a mixture of chloroprene and a comonomer with 0.05 to 5.0 wt. % of a molecular weight regulator in which the polymerization in the presence of effective amount of the molecular weight regulator is carried out to reach a conversion of 40 to 60% and then, 40 to 70 wt. % of the molecular weight regulator incorporated at the initiation of the polymerization is incorporated and the polymerization is continued to give a conversion of higher than 80% and the gel chloroprene polymer (B) is obtained by an aqueous emulsion polymerization of chloroprene or a mixture of chloroprene and a polyfunctional monomer.

Abstract: A powdery rubber is produced by mixing an anionic or nonionic rubber latex with an aqueous solution of an anionic water soluble macro-molecular compound which is dissociated in water to give negative charge; adjusting the pH to an acidic condition; adding to the aqueous solution either a cationic polymer which is water soluble in an acidic condition or a cationic surfactant which causes a coacervation with the anionic water soluble macromolecular compound in an acidic condition to separate the rubber particles from the rubber latex under coacervation and adding an emulsion of a synthetic resin having a glass transition temperature higher than 30.degree. C. to the rubber particles at a ratio of 1 to 50 wt.% (as a solid content) to the solid content of the rubber latex and dehydrating and drying the resulting powdery rubber.

Abstract: Granular rubber is prepared by allowing a latex mixture of a rubber latex and an aqueous solution of a high molecular weight polyanion containing carboxylate groups and/or hydroxyl groups to fall freely into an aqueous solution of an alkaline earth metal salt and separating the granular rubber which forms.

Abstract: This invention relates to a novel process of preparing chloroprene polymer rubber granules. The process comprises adding 4 to 10 wt. parts of sodium silicate to 100 wt. parts of a cationic latex of chloroprene polymer and then adding an alkaline earth metal salt or an acid to precipitate granules of the chloroprene polymer rubber.