Kaneka Corporation

Yousuke Asai

Nao Fujita

Masayuki Fujita

Yoshiki Nakagawa

Hiroshi Iwakiri

Ryotaro Tsuji

Masakuni Ueno

Takeshi Kawamura

Nobuo Ogawa

Susumu Kyotani

Kenji Kuroda

Hajime Harada

The present invention has its object to provide a process for producing a vinyl polymer which can provide a vinyl polymer in such form that a polymerization catalyst is effectively removed from that. The present invention relates to a process for producing a vinyl polymer wherein a vinyl polymer at the time of completion of the polymerization is treated with oxygen in the presence of a polar solvent. More preferably, the present invention relates to a process for bringing a polymer added with a polar solvent having a relative dielectric constant at 20&#xb0; C. of not lower than 10 into contact with mixed gases of oxygen and an inert gas such as nitrogen with an oxygen concentration below the explosion limit oxygen concentration of this solvent as in the state of occurrence as a pure component.

Process for producing vinyl polymer

The present invention relates to a method for producing a vinyl polymer retaining the ability for atom transfer radical polymerization, a method for reliably producing a vinyl polymer having terminal functional groups, a vinyl polymer having functional groups prepared by these methods, and a curable composition comprising the polymer. A vinyl polymer having terminal functional groups can be reliably produced through the steps of preparing a vinyl polymer by atom transfer radical polymerization of a vinyl monomer in a polymerization solvent in the presence of a polymerization initiator and a transition metal complex functioning as a polymerization catalyst, removing the polymerization solvent and the vinyl monomer while the ability for atom transfer radical polymerization is maintained, and supplying a functional-group-introducing agent having a low polymerizability to introduce a functional group to a polymer terminus. During the step of supplying the functional-group-introducing agent, a functional-group-introducing solvent having a dielectric constant higher than that of the functional-group-introducing agent may be supplied to effectively introduce a functional group to a terminus of the vinyl polymer. Furthermore, according to the present invention, the polymerization solvent and the functional-group-introducing agent can be recovered and recycled.

Vinyl polymers and processes for producing the same

Method of producing crosslinkable silyl group-containing polyoxyalkylene polymers

There is provided a purification process for dimethoxymethylsilane in which a mixture containing dimethoxymethylsilane and methanol is subjected to a first distillation step in which the mixture is distilled in the presence of methyl formate or methoxytrimethylsilane so that a distillate fraction containing methanol and methyl formate or methoxytrimethylsilane is distilled off and a balance fraction containing dimethoxymethylsilane and methanol is discharged, the amount of methanol in the balance fraction being substantially reduced relative to that of the mixture.

Purification process for silane compound

Growing community of inventors

Settsu, Japan

Yousuke Asai