Diphenylmethane diisocyanate → Benzylbenzene diisocyanate

참여 물질

반응 단계

An isocyanate composition was produced which contained 0.48 part of a 4,4'- diphenylmethane diisocyanate in which 25-30 weight % of the isocyanate groups have been converted into a uretonimine form (marketed by ICI under the trade name `SUPRASEC` VM 020), 90 parts of a polymethylene polyphenylene polyisocyanate having a functionality of 2.7 and a content of diphenylmethane diisocyanate of 40% weight and between 29.5 and 31.0% by weight of isocyanate groups, and a prepolymer obtained by reacting 8.51 parts of a mixture of 4,440 -diphenylmethane diisocyanate and 2,440 -diphenylmethane diisocyanate (97.4% and 2.6%) with 1.01 parts of a mixture of propylene glycol, 1,3-butane diol and tripropylene glycol (0.8:0.8:1.0 molar ratio).

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