HIGH 2,4'-DIPHENYLMETHANE DIISOCYANATE CONTENT PREPOLYMERS

摘要

The present invention provides NCO prepolymers having a high content of 2,4'-diphenylmethane diisocyanate (MDI). The inventive NCO prepolymers combine the low temperature liquidity and slower reactivity of a 2,4'-MDI prepolymer with the ability to produce a product having the better tensile and tear strength characteristics as is seen in articles made from a 4,4'-MDI prepolymer. The NCO prepolymers of the present invention find use in preparing elastomeric coatings, adhesives, sealants and the like.