High performance polyurethane coating compositions and processes

Details High performance polyurethane coating compositions and processes High performance polyurethane coating compositions and processes

1991-04-09

1992-05-19

Welsh, Maurice J.

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

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 61, 528 65, 528 76, 528 77, 528 81, 528 82, C08G 1810

Patent

active

051150719

ABSTRACT:
This invention relates to polyurethane coatings formed from prepolymers made by reacting polyisocyanates with long chain polyols having an average functionality of greater than 2. The resulting prepolymers have equivalent weights greater than about 250 grams per equivalent and preferably greater than about 350 grams per equivalent. An excess of polyisocyanate is reacted with the polyol component at an equivalent ratio of greater than 4:1 equivalents isocyanate per equivalent of polyol. Excess polyisocyanate is then removed from the prepolymer.
The resulting polyurethane prepolymers are chain extended with compounds having active hydrogen atoms such as water, amines or short chain polyhydroxy compounds, e.g., diols to form the resulting coatings.

REFERENCES:
patent: 3218348 (1965-11-01), McElrey et al.
patent: 3384624 (1968-05-01), Heiss
patent: 3726825 (1973-04-01), Woodward et al.
patent: 4182825 (1980-01-01), Jackle
patent: 4413111 (1983-11-01), Markusch
patent: 4786703 (1988-11-01), Starner et al.
patent: 4888442 (1989-12-01), Dunlap et al.

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