LOW TEMPERATURE STABLE POLYMETHYLENE POLYPHENYLENE POLYISOCYANATES
LOW TEMPERATURE STABLE POLYMETHYLENE POLYPHENYLENE POLYISOCYANATES Low temperature stable polymethylene polyphenylene polyisocyanates are composed of crude polymethylene polyphenylene polyisocyanate containing from about 50 to about 80 percent by weight 2-ring diphenylmethane diisocyanate wherein fr...
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Main Authors | , |
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Format | Patent |
Language | English French |
Published |
09.07.1991
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Edition | 5 |
Subjects | |
Online Access | Get full text |
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Summary: | LOW TEMPERATURE STABLE POLYMETHYLENE POLYPHENYLENE POLYISOCYANATES Low temperature stable polymethylene polyphenylene polyisocyanates are composed of crude polymethylene polyphenylene polyisocyanate containing from about 50 to about 80 percent by weight 2-ring diphenylmethane diisocyanate wherein from about 65 to about 93 weight percent of the 2-ring diisocyanate is 4,4'- and from about 7 to about 35 weight percent is 2,4'- and furthermore the composition contains from about 1 to about 5 weight percent carbodiimide-uretonimine structure. The polyisocyanates are useful in preparing polyurethane foams. |
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Bibliography: | Application Number: CA19860500270 |