Ikeda Bussan Co. Ltd.

Bridgestone Corporation

Kenji Shimomura

Toru Okuyama

Take Sato

Shigeaki Kouketsu

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

Disclosed is a method for manufacturing a flame-retardant polyurethane foam which comprises the steps of:

Method for manufacturing flame-retardant polyurethane foam

A method for the manufacture of shaped articles of polyurethane foam, which comprises pretreating metal molds for at least two types of shaped articles of polyurethane foam conveyed on conveyor units connected to heater units, forwarding said metal molds on the conveyor units according to the types of shaped articles to be produced, adjusting temperatures of said metal molds, feeding relevant polyurethane dopes to said metal molds, conveying said metal molds containing the dopes on conveyor units into the heater unit containing hot water, and immersing said metal molds in the hot water thereby allowing the dopes to foam and set within said metal molds.

Method for manufacture of shaped article of polyurethane foam

Process for producing polyurethane-foam moldings and apparatus for the same; the polyurethane-foam moldings are produced through the steps of pre-treating molds and injecting a foamable polyurethane resin reaction mixture into the molds; carrying the molds with the foamable polyurethane resin reaction mixture injected therein to a reservoir tank containing a heated liquid such as hot water or oil and dipping them into the liquid; and carrying the dipped molds out of the reservoir tank and opening them to take out the moldings thus produced. Such process for production of polyurethane-foam moldings is carried out by an apparatus in which a conveyance machine is so arranged as to delineate a circular orbit, in a normal plane, along which it moves circulating; molds in pairs are fixed to the conveyance machine along the length thereof at regular intervals; a reservoir tank is provided which accommodates a lower portion of the rotating orbit of the conveyance machine; said reservoir tank being filled with a heated liquid; thus molds pass through the liquid; and along the upper rotating orbit of the conveyance machine, the foamable polyurethane resin reaction mixture is put into the molds while moldings are taken out of the molds which have thus followed a cycle of production along the entire orbit of the conveyance machine. Further, in various apparatuses which can realize the above-described process of production, the molds used have the edges extending downward when the molds are in the liquid and the outer ends so bent as to extend horizontally.

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Yokohama, Japan

Kenji Shimomura