Method for manufacturing polyurethane foam
AssigneeImperial Chemical Industries PLC
InventorsShoji Takao, Hideo Yamashita, Katsuyoshi Suetsugu, Yasunori Toyama, Kazuki Sasaki
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Abstract
A method for manufacturing polyurethane foam by mixing (a) polyisocyanate, (b) polyol, (c) blowing agent, (d) catalyst and, as required (e) surface active agent, filler, or other such additive, the said method being characterized in that the polyisocyanate (a) is a prepolymer with isocyanate end groups produced from a polyester polyol and a blended polyisocyanate component comprising 45-95 weight % of diphenylmethane diisocyanate and 55-5 weight % of a polymethylene polyphenyl polyisocyanate with a functionality of 3 or more.
Claims2
In a method for manufacturing polyurethane foam by mixing (a) polyisocyanate, (b) polyol, (c) blowing agent, (d) catalyst and, as required (e) surface active agent, filler, or other such additive, the improvement wherein the polyisocyanate (a) is a prepolymer with isocyanate end groups produced from polyester polyol and a blended polyisocyanate component comprising 45-95 weight % of diphenylmethane diisocyanate and 55-5 weight % of a polymethylene polyphenyl polyisocyanate with a functionality of 3 or more, the use of a polyester polyol rather than polyether polyol in the preparation of said prepolymer providing a polyurethane foam having improved adhesion to vinyl chloride resins.
Dependencies are inferred from the claim text.