The present disclosure relates to a polymerization process wherein the emulsifier is introduced in an initial batch as well as during a continuous feed to provide improved mechanical stability of the generated latex. Improved soap coverage can also be achieved during the polymerization process.

The present invention relates to a commercial reaction process for the selective oligomerization reaction of ethylene, and a method for efficiently removing reaction heat to be generated in a reaction and regulating the temperature of the reactor and, more specifically, to an oligomerization reaction process of ethylene by circulating a liquid mixture in the reactor, separating unreacted ethylene from this circulation flow by an apparatus for separating unreacted ethylene from the circulation flow, and then cooling the remaining mixture and reintroducing it to the reactor, thereby removing the reaction heat in the reactor and allowing temperature control.

The present invention relates to a commercial reaction process for the selective oligomerization reaction of ethylene, and a method for efficiently removing reaction heat to be generated in a reaction and regulating the temperature of the reactor and, more specifically, to an oligomerization reaction process of ethylene by circulating a liquid mixture in the reactor, separating unreacted ethylene from this circulation flow by an apparatus for separating unreacted ethylene from the circulation flow, and then cooling the remaining mixture and reintroducing it to the reactor, thereby removing the reaction heat in the reactor and allowing temperature control.

A vinylidene fluoride copolymer composition having stable dispersibility in a dispersion medium over a long period of time, the composition having a melting temperature of 140? C. or lower, a reversing heat flow of the composition has endothermic peaks having an amount of enthalpy of fusion of 2 J/g or more, and an absolute value of a difference between a temperature showing a largest endothermic peak among the endothermic peaks and the melting temperature of the composition is 10? C. or lower. When a dispersion containing butyl butyrate and the vinylidene fluoride copolymer composition (vinylidene fluoride content rate of 10 mass %) is left to stand for 20 hours, a content rate of the vinylidene fluoride copolymer composition in an upper 20 vol % of the dispersion after the dispersion is left to stand is 4.0 mass % or more and 10 mass % or less.

A vinylidene fluoride copolymer composition having stable dispersibility in a dispersion medium over a long period of time, the composition having a melting temperature of 140? C. or lower, a reversing heat flow of the composition has endothermic peaks having an amount of enthalpy of fusion of 2 J/g or more, and an absolute value of a difference between a temperature showing a largest endothermic peak among the endothermic peaks and the melting temperature of the composition is 10? C. or lower. When a dispersion containing butyl butyrate and the vinylidene fluoride copolymer composition (vinylidene fluoride content rate of 10 mass %) is left to stand for 20 hours, a content rate of the vinylidene fluoride copolymer composition in an upper 20 vol % of the dispersion after the dispersion is left to stand is 4.0 mass % or more and 10 mass % or less.

The invention relates to a method to reduce or prevent agglomeration of polyisobutylene particles in aqueous media by LCST compounds and highly pure polyisobutylenes obtained thereby. The invention furthier relates to polyisobutylene products comprising the same or derived therefrom.

The invention relates to a method to reduce or prevent agglomeration of polyisobutylene particles in aqueous media by LCST compounds and highly pure polyisobutylenes obtained thereby. The invention furthier relates to polyisobutylene products comprising the same or derived therefrom.

The invention relates to a method to reduce or prevent agglomeration of polyisobutylene particles in aqueous media by LCST compounds and highly pure polyisobutylenes obtained thereby. The invention furthier relates to polyisobutylene products comprising the same or derived therefrom.

Method for producing a thermoplastic moulding compound containing: up to 40 wt. % of a graft copolymer A, containing 50-70 wt. % graft base A1 from an acrylic ester polymer and 30-50 wt. % of a graft shell A2, and 0-90 wt. % of a hard matrix B, wherein the reaction for producing the graft copolymer A is carried out in the presence of 0.01 to 4 times the molar amount of sodium carbonate, relative to the molar amount of initiator, wherein the reaction for producing copolymer A is carried out in the presence of 0.1 to 1 wt. % of an emulsifier relative to the amount of the respective monomers used, and wherein during the polymerisation reaction, during the post-polymerisation and/or after the polymerisation reaction, water or an aqueous alkali solution are added to the reaction mixture for producing the graft copolymer A.

Method for producing a thermoplastic moulding compound containing: up to 40 wt. % of a graft copolymer A, containing 50-70 wt. % graft base A1 from an acrylic ester polymer and 30-50 wt. % of a graft shell A2, and 0-90 wt. % of a hard matrix B, wherein the reaction for producing the graft copolymer A is carried out in the presence of 0.01 to 4 times the molar amount of sodium carbonate, relative to the molar amount of initiator, wherein the reaction for producing copolymer A is carried out in the presence of 0.1 to 1 wt. % of an emulsifier relative to the amount of the respective monomers used, and wherein during the polymerisation reaction, during the post-polymerisation and/or after the polymerisation reaction, water or an aqueous alkali solution are added to the reaction mixture for producing the graft copolymer A.