Mitsubishi Rayon Company, Limited

Tomihiko Kawamura

Tadashi Matsuda

Hideaki Habara

Jun Nakauchi

Shuichi Sugimori

Shuighi Sugimori

Shintaro Nakano, Deceased

Sumito Saiki

A porous water-treating material comprising cut porous strads 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.

Porous water-treating material

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

Photo, electron beam and x-ray sensitive resins are comprised of a 2-alkylglycidyl methacrylate homopolymer or a copolymer containing at least 50 mol % of alkylglycidyl methacrylate. The resins have excellent resolving power and sensitivity and are useful for negative type resists.

Sensitive resins comprising 2-alkylglycidyl methacrylate homopolymer or

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Ohtake, Japan

Tomihiko Kawamura