Nippon Zeon Company, Ltd.

Hiroshi Yaginuma

Motoyuki Yamato

Masaaki Inoue

Ryuji Kita

Tadahiro Go

A process for preparing a semipermeable membrane, which comprises contacting a thin polyamine film applied to a liquid-permeable microporous substrate with a polyalicyclic diisocyanate or polyalicyclic dicarbonyl halide capable of reacting with the amino or imino groups in the polyamine, thereby to crosslink the polyamine at the surface portion of the thin film.

Process for producing semipermeable membrane

A process for preparing a colorless, odorless and transparent polymer oil having a low number average molecular weight, iodine value and viscosity and a high flash point, characterized by copolymerizing a mixture of n-pentene-1 and at least one other chain pentene in specific quantitative ratios in a Friedel-Crafts type catalyst and then hydrogenating the thus obtained liquid copolymer to a certain extent, and the polymer oil prepared thereby.

Process for preparing polymer oils and polymer oils prepared thereby

Liquid polymers made predominantly of 1,3-pentadiene and 1,3-butadiene, which have a number average molecular weight of 300 - 10,000 and an iodine number of at least 250 and are capable of forming hydrocarbon solvent-insoluble coatings thereof; a process for preparing the liquid polymers; and paint compositions comprising the liquid polymer as the vehicle.

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Kawasaki, Japan

Hiroshi Yaginuma