Kanegafuchi Kagaku Kogyo Kabushiki Kaisha

Kanegafuchi Chemical Industry Co., Ltd.

Hideo Yasui

Yasuhiro Miki

Toragoro Mitani

Wataru Okada

Takamichi Komabashiri

Hiroaki Yamauchi

Hisashi Morikawa

The present invention provides a method for recovering polymer agglomerates in the form of dry powders or granules comprising steps of:

Method of recovering polymer agglomerates as dry powders or granules

A chemical cleaning method for removing scales and other substances deposited on the interior of a polymerization reactor used in emulsion polymerization or suspension polymerization. This method comprises chemically cleaning the interior using an aqueous solution or dispersion of an alkali agent and a surfactant. According to this method of cleaning, scales deposited on the interior of a polymerization reactor, in particular, scales deposited during polymerization on the inside surface, an agitator and baffle-plates of the reactor are completely removed.

Chemical cleaning method of the interior of polymerization reactor

The present invention provides a method of manufacturing coagulated grains from polymer latex and apparatus for exercising this method, said method being characterized in that a swirl of polymer latex is produced in tank, while holding it at a temperature lower than the softening temperature of the polymer latex particles and while letting the same polymer latex as said polymer latex fall down into the aforementioned swirl liquid surface, a coagulant is added into said latex flowing-down liquid, thereby letting the coagulant disperse and scatter into the latex in the tank; thereafter, with said coagulant thus scattered as the seeds, coagulated layers are grown on their outer surfaces. According to this invention, nearly spherical coagulated grains with a uniform grain size may be obtained, while suppressing possible formation of massive coagulated matters.

Method and apparatus for manufacturing coagulated grains from polymer

A cleaning method for removing scales, etc., deposited on the interior of a polymerization reactor which has been used in emulsion or suspension polymerization. This method uses a chemical cleanser comprising a soap builder an, alkali agent, an aqueous solution or dispersion of a surfactant, and an organic solvent and/or polymerizable monomer. This system may further contain a plastic packing such as tellerettes. By this method, scales deposited on the interior of a polymerization reactor, particularly, scales deposited on the inside surface, agitator, and baffle-plates of the reactor, are compeltely removed.

Method of cleaning the interior of polymerization reactor

An apparatus for cleaning a tank-like vessel comprising

Apparatus for cleaning a tank-like vessel

The present invention provides polymer latex grains having latex particles which compose each coagulated grain compacted therein in the state of not being mutually fused; said grains are obtained by the following steps of (A)-(E):

Compacted agglomerates of polymer latex particles

Disclosed is a method of producing coagulated colloidal particles with close-packed structure which comprises;

Method of producing coagulated colloidal particles

A process for producing a coagulated latex is disclosed which comprises spraying into a coagulating chamber a suspension liquid or a high polymer latex to disperse as droplets, simultaneously spraying a coagulant into the chamber in the form of gas or mist, introducing into the chamber super-heated steam to heat dispersed droplets of the suspension liquid or the high polymer latex and the coagulant, collecting coagulated particles in a film-like flow of water or an organic solvent flowing downward along side walls and the bottom of the chamber, and recovering the coagulated particles. Also disclosed is an apparatus used for practicing the foregoing process which comprises a spraying means of a suspension liquid or a high polymer latex into a coagulating chamber, a spraying means of a coagulant, a distributing means of a downward flow liquid which forms a film-like flow of water or an organic solvent covering side walls of the chamber, a means for heating and rectification by which super-heated steam is introduced and the flow of atmosphere in the chamber is rectified, a gas-liquid contacting means which brings the downward flow liquid into contact with an exhaust gas, and a means for removing slurry containing coagulated particles.

Process for producing a coagulated latex of spherical configuration

In a process of emulsion-polymerization in a polymerization system containing an acrylate or a methacrylate monomer at least 60%; the improvement which comprises carrying out the emulsion polymerization in a polymerization vessel having a film of a quinone-amine compound of not less than 3000 in average molecular weight on the inner vessel wall, said quinone-amine compound being prepared by addition-reacting an aromatic quinone and an aromatic diamine in a solvent medium having a solubility parameter of 9.0 to 12.2. According to the process, the polymer scale deposition can be prevented in the acrylate or methacrylate polymerization system.

Growing community of inventors

Kobe, Japan

Hideo Yasui