Patent GB-572475-A (GB)
Title: An improved manufacture of vulcanisable polymers from diolefins
IPC: C08F36/04
Filed: 1941-11-11
Abstract: Vulcanizable elastic polymers are prepared by polymerizing a water emulsion of a diolefin containing material, while maintaining the pH of the reaction mixture between 8.1 and 8.8, and raising the temperature progressively as the polymerization proceeds.  The process is carried out in the presence of an emulsifying agent such as sodium oleate, sodium stearate, sodium palmitate or other soluble soaps, salts of sulphonated long carbon chain amides and alcohols, e.g. alkylated naphthalene sulphonates, and in the presence of a polymerization catalyst which may be hydrogen peroxide, benzoyl peroxide, ammonium persulphate or other peroxide compounds.  The diolefin containing material may be butadiene or mixtures of butadiene with other polymerizable materials such as styrene, acrylonitrile, vinyl naphthalene, unsaturated esters or ketones, e.g. methyl vinyl ketone.  In the examples: (1) a mixture containing water, sodium oleate, acrylonitrile, butadiene and hydrogen peroxide are pressured with nitrogen in a bomb and then heated at progressively higher temperatures.  The polymer is precipitated from the mass with sodium chloride and is compounded and vulcanized. Various amounts of the reactants and different pH values are tested, and the quality of the products obtained are compared; (2) a mixture of water, "Igepon T," (Registered Trade Mark), acrylonitrile, butadiene and hydrogen peroxide are treated similarly; (3) a mixture of water, dodecyl amine, acetic acid, acrylonitrile, butadiene and ammonium persulphate are polymerized.ALSO:Vulcanizable elastic polymers are prepared by polymerizing a water emulsion of a diolefin-containing material, while maintaining the pH of the reaction mixture between 8.1 and 8.8 and raising the temperature progressively as the polymerization proceeds.  The process is carried out in the presence of an emulsifying-agent such as sodium oleate, sodium stearate, sodium palmitate or other soluble soap, salts of sulphonated long carbon chain amides and alcohols, e.g. alkylated naphthalene sulphonates, and in the presence of a polymerization catalyst which may be hydrogen peroxide, benzoyl peroxide, ammonium persulphate or other peroxide compound.  The diolefin-containing material may be butadiene or mixtures of butadiene with other polymerizable materials such as styrene, acrylonitrile, vinyl naphthalene, unsaturated esters or ketones, e.g. methyl vinyl ketone. In the examples: (1) a mixture containing water, sodium oleate, acrylonitrile, butadiene and hydrogen peroxide is pressured with nitrogen in a bomb and then heated at progressively higher temperatures.  The polymer is precipitated from the mass with sodium chloride and is compounded and vulcanized.  Various amounts of the reactants and different pH values are tested, and the quality of the products obtained are compared; (2) a mixture of water, Igepon T, acrylonitrile, butadiene and hydrogen peroxide is treated similarly; (3) a mixture of water, dodecyl amine, acetic acid, acrylonitrile, butadiene and ammonium persulphate is polymerized.