Polyisocyanate compositions for the preparation of

专利名称：Polyisocyanate compositions for the

preparation of flexible polyurethane foams

发明人：Narayan, Thirumurti,Lovell, David J.,Herrera

Lopez, Carlos

申请号：EP95111565.8申请日：19950722公开号：EP0694570A1公开日：19960131

摘要：The invention provides a liquid polyisocyanate prepolymer composition which isa result of combining about 50 to 90 percent by weight of an isocyanate blend (a.) having55 to 75 weight percent 4,4'-MDI, 17 to 27 weight percent 2,4'-MDI, 1 to 10 weightpercent 3-ring MDI oligomer, and 1 to 15 weight percent n-ring MDI oligomer (n greaterthan 3); about 5 to 30 weight percent of a polyhydroxy containing polyol (b.) having amolecular weight of from 700 to about 6,000, and about 5 to 15 weight percent of atoluene diisocyanate (c.). The resulting isocyanate prepolymer composition has a freeNCO content of from about 20 to 40 weight percent and particularly desirable flowcharacteristics. The invention further provides a method of making an isocyanateprepolymer composition, a process of making a polyurethane foam utilizing the

isocyanate prepolymer composition of the invention, and polyurethane foams producedby the disclosed process.

申请人：BASF CORPORATION

地址：3000 Continental Drive North Mount Olive, New Jersey 08728-1234 US

国籍：US

代理机构：Bernhardt, Wolfgang Willy-Hans

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