Mitsubishi Rayon Company, Limited

Nitto Chemical Industry Co., Ltd.

Diafloc Co., Ltd.

Itsubishi Rayon Co., Ltd.

Hideaki Habara

Teruhiko Sugimori

Fumio Suzuki

Noriyuki Tajiri

Hiromasa Inada

Haruki Sato

Yutaro Fukuda

Hajime Itoh

Hiroshi Takahashi

Kouji Ohbori

Akio Hironaka

Tadashi Matsuda

Akihisa Furuno

Teruyuki Yamada

Katsuhiko Shinada

Ken-ichi Inukai

Yoshihiko Hosako

Shuichi Sugimori

Tomihiko Kawamura

Naoyuki Fukabori

Shigeki Ogawa

Keiji Hirota

Sadatoshi Nagamine

Yoshihiko Tanaka

Takashi Kozakura

Shintaro Nakano, Deceased

Sumito Saiki

The present invention provides fibril system fibers which may be employed in filter applications and in artificial leather applications, and also provides an industrially superior manufacturing method for such fibril system fibers, and a spinning nozzle. The fibril fibers of the present invention include at least one macromolecular polymer having a film forming ability, and they have a structure in which fibrillated fibers having a diameter of 10 micrometers or less branch from main fibers having a width within a range of 0.1 micrometers-500 micrometers, and a length within a range of 10 micrometers-10 cm.

Method for manufacturing fibril system fiber

The invention discloses a process for the production of a particulate polymer which contains few fine particles and has a narrow particle size distribution and a controlled bulk specific gravity. Characteristic features of the process of this invention reside in that a polymer latex obtained by emulsion polymerization is successively processed through the following steps (I) and (II):

Continuous production process of particulate polymer and control method

Disclosed is method for producing a rubber modified thermoplastic reins which comprises carrying out all or a part of the following setps (I) - (VI):

Method for producing rubber modified thermoplastic resins

Disclosed herein is a particulate polymer prepared by the agglomeration of polymer particles contained in a polymer latex. The particulate polymer is composed of primary particles having particle sizes of at least 20 .mu.m and/or secondary particles formed by the agglomeration of at least some of the primary particles and is in the form of a compact mass substantially free of voids. The particulate polymer is prepared by coagulating the polymer latex in the presence of a coagulant and an organic liquid having low solubility in water. The particulate polymer has a high bulk specific gravity and contains few fine particles. It is thus easy to handle and allows the consumption of energy to be reduced in the drying step.

Particulate polymer and preparation process thereof

Disclosed is a porous membrane consisting of a film-forming polymer characterized in that:

Porous membrane

A method for coagulation of a polymer latex by feeding the polymer latex to an extruder having a base plate and a plurality of fine tubes fixed to said base plate and extending therefrom, said fine tubes being mutually spaced by at least 1 mm and protruding from said base plate by at least 3 mm, and discharging said polymer latex through said fine tubes into a coagulation solution to coagulate the latex.

Method for coagulation of a polymer latex

Disclosed is a method for producing a rubber modified thermoplastic resin which comprises carrying out all or a part of the following steps (I)-(VI):

Porous membranes are produced by dissolving a film-forming polymer in a good solvent for the polymer, forming a film of the resulting polymer solution, and forcibly contacting saturated steam or mist-containing steam with at least one surface of said film. Such porous membranes have pores having a narrow pore diameter distribution and extending in a direction substantially perpendicular to the membrane surface at a high surface pore density on at least one surface thereof.

Process for producing porous membranes

A porous water-treating material comprising cut porous strands each comprising a resinous matrix material which consists essentially of a thermoplastic polymer material or a mixture thereof with an inorganic particulate material. Each strand having a number of pores connected to each other and an irregularly rugged peripheral surface which has a ratio in diameter of a circumscribed circle to an inscribed circle in any cross-sectional profile from 1.10:1 to 5.00:1 and a ratio of the distance between circumscribed lines to that between inscribed lines in any side projection profile of from 1.10:1 to 3.00:1. The cut porous strands are prepared by melt-extruding a resinous mixture of the resinous matrix material with a blowing agent at a temperature higher than the melting point of the thermoplastic polymer material and the thermally decomposing point of the blowing material so as to cause the strands to have a number of pores and an irregularly rugged peripheral surface thereof.

Process of using a porous water-treating material

An electrostatic recording material comprising a substrate treated for low electric resistance and a dielectric layer formed on the substrate and composed of a composition comprising an insulating resin having a volume specific resistance of at least 10.sup.12 .OMEGA.cm and a powder of an acrylonitrile-type polymer having a copolymerized acrylonitrile content of at least 95% by weight and containing substantially no ionic groups, said powder having a volume average particle size of from 1.5 to 4 .mu.m and a content of particles having a size exceeding 8 .mu.m as measured by a particle size distribution measuring apparatus, being at most 0.02% by number.

Electrostatic recording material

Apparatus for coagulation of a polymer latex by feeding the polymer latex to an extruder having a base plate and a plurality of fine tubes fixed to said base plate and extending therefrom, said fine tubes being mutually spaced by at least 1 mm and protruding from said base plate by at least 3 mm, and discharging said polymer latex through said fine tubes into coagulation solution to coagulate the latex and an extruder used for carrying out said method.

Extrusion nozzle for coagulation of polymer latices

The invention relates to a process for producing a powder of a cationic polymer by spreading on a moveable carrier a layer of an aqueous solution of a vinyl monomer, carrying out continuous polymerization followed by peeling off hydrous polymer from the carrier in a hot state, and cutting said hydrous polymer in a hot state by a shearing stress.

Process for producing powder of cationic polymer

There is disclosed a method for treating an emulsified latex which comprises discharging an emulsified latex containing particles of 1 .mu.m or less in diameter into a coagulation solution from fine tubes which satisfy L/D.gtoreq.0.065 Re (L: length of fine tube, and D: equivalent diameter of fine tube and Re: Reynolds number) at a Reynolds number of 300 or less to coagulate the latex and washing and drying the coagulated latex to obtain a particulate of high bulk specific gravity containing substantially neither fine powders nor coarse particles or a pellet-like product.

Method for treating emulsified latex

A screw-type hydro-extracting extruder comprising a raw material supply zone, a hydro-extracting zone and a heat-melting zone, said hydro-extracting zone is comprised of a plurality of doughnut-shaped plates and a slit is formed between every two adjacent plates.

Growing community of inventors

Ohtake, Japan

Hideaki Habara