Patent ID: 9598605
Date: 2017-03-21
CPC Classifications: B05B,B05C,B29B,C08G,C08J,C09D

Claim:
1. A polyurethane spraying system used to minimize emissions of a polyisocyanate while spraying a mixture of a polyisocyanate and a resin composition onto a surface, said system comprising: A. a first reactant supply tank comprising the resin composition having a hydroxyl content of at least 400 mg potassium hydroxide per gram (KOH/g) and comprising: B. a second reactant supply tank comprising the polyisocyanate; C. a source of a gaseous propellant that is coupled with said first and second reactant supply tanks; D. a mixing apparatus that is coupled with said first and second reactant supply tanks for mixing the resin composition and the polyisocyanate prior to spraying; E. a spray nozzle that is coupled with said mixing apparatus and that produces less than 50 parts of the polyisocyanate per one billion parts of air according to Occupational Safety & Health Administration Method 47 while spraying the mixture onto the surface at a rate of 5 to 30 lbs/min to form a polyurethane foam having a closed cell content of at least 90 percent, said spray nozzle comprising: