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AssigneeBayer MaterialScience AG
InventorsMasafumi Nakamura, Hiroshi Ikuta, Masaru Suzuki, Hitoshi Maeda
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The present invention provides a method for producing a polyurethane foam molded article from a polyisocyanate compound, a polyol mixture containing polyol, a catalyst and a crosslinking agent, and a blowing agent, said method comprising continuously injecting the polyisocyanate compound, the polyol mixture and the blowing agent into a mold, using a molding machine capable of separately supplying the polyisocyanate compound, the polyol mixture and the blowing agent, while the timing of starting to inject the blowing agent is delayed after the start of injecting the polyisocyanate compound and the polyol mixture. The inventive method produces, in a single stage, a polyurethane foam molded article having the skin or high density portion selectively formed on portions of the molded article actually requiring them, where the proportions of the skin and the high density portion and the foamed core can be varied freely.
In a method of producing a polyurethane foam molded article from a polyisocyanate compound, a polyol mixture comprising a polyol, a catalyst and a crosslinking agent, and a blowing agent, the improvement comprising arranging a molding machine capable of providing the polyisocyanate compound, the polyol mixture and the blowing agent such that, when the polyisocyanate compound, the polyol mixture and the blowing agent are continuously injected, the injection initiation of the blowing agent is delayed from injection initiation of the polyisocyanate compound and polyol mixture.
A method for producing a polyurethane foam molded article comprising combining a polyisocyanate compound, a polyol mixture containing polyol, a catalyst and a crosslinking agent, and a blowing agent, said method comprising:
Dependencies are inferred from the claim text.