Process for preparing stable solutions of trimerized isocyanates

Details Process for preparing stable solutions of trimerized isocyanates Process for preparing stable solutions of trimerized isocyanates

1984-12-24

1985-11-12

Cockeram, Herbert S.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

252182, 521160, 521902, 521137, 528 67, 528 73, C08G 1814, C08G 1818

Patent

active

045529027

ABSTRACT:
Trimerized isocyanates having improved solubility in polyisocyanates are prepared by reacting a polyisocyanate with a low equivalent weight polyol to form a first prepolymer, forming a cotrimer from said first prepolymer by reaction of same with diphenylmethane diisocyanate or polymeric derivatives thereof, and forming a second isocyanate terminated prepolymer by reacting said cotrimer with a second low equivalent weight polyol. The resulting cotrimer can be diluted in a polyisocyanate and used to prepare polymers, particularly polyurethane foams, having excellent properties.

REFERENCES:
patent: 3621020 (1971-11-01), Ojakaar
patent: 4310632 (1982-01-01), Horacek et al.
patent: 4382125 (1983-05-01), Narayan et al.
patent: 4395530 (1983-07-01), Hammond
patent: 4456709 (1984-06-01), Richter et al.

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