Polyurethane resins and polyurethane resin coating compositions

Details Polyurethane resins and polyurethane resin coating compositions Polyurethane resins and polyurethane resin coating compositions

1979-08-14

1981-01-27

Hamrock, William F.

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...

260 312R, 260 316, 260 332R, 260 334UR, 260 336UB, 528 84, C08G 1800

Patent

active

042476755

ABSTRACT:
Polyurethane resins with an excellent weather resistance are provided by the reaction of polyols with trifunctional isocyanates which are expressed by the following general formula: ##STR1## (R=a remnant of divalent hydrocarbon group with carbon number of 2 or 3) The reaction between a polyol and a trifunctional isocyanate is effectuated at an NCO/OH mole percentage of 0.5 to 2.0, and adjustments are made so that the concentration of carbamide group will be 5.times.10.sup.-4 to 50.times.10.sup.-4 moles per gram of the reaction product, and that the bridging parameter will be 150 to 1,500.
The resins may be used to best advantage as polyurethane resin coatings excelling in weather resistance.

REFERENCES:
patent: 3236812 (1966-02-01), McElroy
patent: 3383400 (1968-05-01), Meisert et al.
patent: 3397253 (1968-08-01), Merten et al.
patent: 3503932 (1970-05-01), Reuter
patent: 3567763 (1971-03-01), Emmons et al.
patent: 3684769 (1972-08-01), Abbott et al.
patent: 4001290 (1977-01-01), Wagner et al.

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