Sunstar Giken Kabushiki Kaisha

Yuasa Battery Co., Ltd.

Kobe Cast Iron Works, Ltd.

Masahiro Ito

Yuji Hayashi

Hiroyoshi Shibata

Shinya Ushiama

Gun Nakanishi

Hiroyoshi Yoshida

An object of the present invention is to provide a non-solvent type polyurethane resin which may be preferably used for a curing composition having physical properties after curing of low modulus and high elongation and which is excellent in adhesion, physical properties, handling property and storage stability and a process for producing the polyurethane resin without difficulty and at low cost. The polyurethane resin is obtained by reacting a urethane prepolymer obtained by reacting a mixture of a monool and a polyol, having on average 1.3 to 2.1 of terminal hydroxyl groups, and a polyisocyanate, and a compound having a crosslinkable silyl group, an imino group and an amino group in a molecule.

Polyurethane resin

A mold for lead casting comprising a porous metal material which does not form an alloy with molten lead and which has a thermal conductivity of from 3-15 kcal/(m.multidot.hr.multidot..degree.C.) and having a percentage of pores having a radius larger than or equal to 40 microns being 7% or less of the total pore volume. The porous metal material has a permeability of at least 0.2 ml/sec.multidot.cm.sup.2 at a material thickness of 10 mm and ambient pressure of 0.02 kg/cm.sup.2. A casting mold enabling casting of a lead grid without using a lubricant due to the lubricity of the mold material itself is realized.

Mold for lead casting

Growing community of inventors

Takatsuki, Japan

Masahiro Ito