Bayer Corporation

John W Frink

Karl W Haider

Heber D Layton

Peter H Markusch

James W Rosthauser

Howard S Duff

Bonnie L Lawson

Michael A Joseph

Isocyanate prepolymers which are useful as binders are made from a polyisocyanate mixture and a hydroxyl compound having at least about 1 hydroxyl group. The polyisocyanate mixture is made up of from about 50 to about 60% by weight of polyphenyl polymethylene polyisocyanate and from about 40 to about 50% by weight of an isomeric mixture of diphenylmethane diisocyanate (MDI). The isomeric mixture of MDI is made up of from about 4 to about 30% by weight of the 2,4'-isomer and from about 70 to about 96% by weight of the 4,4'-isomer. The binders of the present invention are advantageous in that they may be used in high moisture, low temperature conditions without a catalyst. Reduced MDI emissions are also achieved when the binders of the present invention are used to make composite materials.

Modified PMDI for faster press times or lower press temperatures and

The present invention is directed to a process for the production of a modified cellulosic product by:

Treatment of cellulosic fiber products

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Coraopolis, PA, United States of America

John W Frink