Bridgestone Corporation

Ikeda Bussan Co. Ltd.

Bridgestone Tire Company Limited

Take Sato

Toru Okuyama

Kenji Shimomura

Shigeaki Kouketsu

Tsuneaki Narumiya

Shigeru Iwasawa

Flame-retardant polyurethane foam having a very good skin weldability and a very low level of skin staining is produced from a polyhydroxy compound, organic polyisocyanate, blowing agent, catalyst, foam stabilizer, and flame retardant, and other additives, wherein the flame retardant contains a triaryl phosphate ester and the polyhydroxy compound is a mixture composed of 100 parts by weight of high-molecular-weight polyhydroxy compound having a hydroxyl number lower than 100 and 0.5 to 10 parts by weight of low-molecular-weight polyhydroxy compound having a hydroxyl number higher than 560 and having 2 to 4 hydroxyl groups in one molecule.

Production of polyurethane foam

An ink roller and a method of producing the same are disclosed. This ink roller is produced by preheating a flexible polyurethane foam havng a three-dimensional skeletal reticulated structure and a pore size of 20-60 pores/cm at 130.degree.-190.degree. C., subjecting the preheated foam to permanent deformation through compression at a temperature of 130.degree.-220.degree. C. and a compressibility of 1/3-1/15 and cutting the resulting compression body having a hardness of 15.degree.-60.degree. into a given shape in such a manner that the axial direction is coincident with the compression direction of the compression body.

Ink roller and a method of producing the same

Growing community of inventors

Yokohama, Japan

Take Sato