摘要:
A process for polymerization of a diene is provided. The process comprises: a) reacting the diene with hydrogen peroxide in a hydrophilic organic solvent in the presence of water to obtain a polymerization reaction mixture; b) contacting the polymerization reaction mixture with water having a temperature of from 20 to 80° C. to form a mixture having an organic phase and an aqueous phase; c) removing unreacted gaseous diene from the water mixture obtained in b); d) separating the aqueous phase comprising the hydrophilic solvent from the organic phase of the water mixture; and e) distilling volatile materials from the separated organic phase from d) to obtain the polymerization product; wherein a temperature of the reaction a) is from 50-150° C., a pressure of the reaction a) is from 0 to 50 bar, the unreacted gaseous diene removed in c) is condensed, distilled and the distillate obtained reacted according to a), and the hydrophilic solvent is recovered from the separated aqueous phase and reused according to a). Also provided is an apparatus for conducting the process of the invention.
摘要:
An epoxidized polyalkenylene is prepared reacting a polyalkenylene, an aqueous solution of 15 to 90% by volume of hydrogen peroxide and a carboxylic acid having from 1 to 3 carbon atoms in the presence of a catalyst which is phosphonic acid, a derivative of phosphonic acid or a mixture thereof, without addition of an organic solvent or water, to obtain the epoxidized polyalkenylene. The epoxidized polyalkenylene has a number-average molar mass of between 500 and 50 000 g/mol and an epoxide oxygen content of between 1 and 25 percent by mass.
摘要:
The invention describes a novel production process for coated particles composed of granulated-rubber material, the coating, the particles coated therewith and the uses of the coated particles. The coating formulation is solvent-free.
摘要:
The method describes a novel production method for coated particles made of rubber granules, the coating, the particles thus coated, and the use of the coated particles.