Modified PMDI for faster press times or lower press temperatures

Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor

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524 13, 524 14, 524 35, 528 67, 528 78, 528 85, 528 59, 528905, 560 25, 560 26, 560 33, 560330, 560359, 2521822, 25218222, C09J17504, C09J17508, C07C27128, C08G 1850

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active

060224444

ABSTRACT:
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.

REFERENCES:
patent: 4100328 (1978-07-01), Gallagher
patent: 4370463 (1983-01-01), Schafer
patent: 4448907 (1984-05-01), Schafer
patent: 4546039 (1985-10-01), Horacek et al.
patent: 4608407 (1986-08-01), Kerimis et al.
patent: 4609513 (1986-09-01), Israel
patent: 5002713 (1991-03-01), Palardy et al.
patent: 5070114 (1991-12-01), Watts et al.
patent: 5179143 (1993-01-01), Konig et al.
James B. Wilson's--"Isocyanate Adhesives as Binders for Composition Board" which was presented at the symposium "Wood Adhesive-Research, Application and Needs" held in Madison, Wisconsin on Sep. 23-25, 1980.

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