US 12,168,307 B2
Wood preservatives
Selvanathan Arumugam, Blue Bell, PA (US); David A. Laganella, Swedesboro, NJ (US); and Randall W. Stephens, Collegeville, PA (US)
Assigned to Nutrition & Biosciences USA 2, LLC, Pittsburgh, PA (US)
Appl. No. 17/280,998
Filed by Nutrition & Biosciences USA 2, LLC, Pittsburgh, PA (US)
PCT Filed Sep. 24, 2019, PCT No. PCT/US2019/052598
§ 371(c)(1), (2) Date Mar. 29, 2021,
PCT Pub. No. WO2020/068748, PCT Pub. Date Apr. 2, 2020.
Claims priority of provisional application 62/738,464, filed on Sep. 28, 2018.
Prior Publication US 2021/0339425 A1, Nov. 4, 2021
Int. Cl. B27K 3/15 (2006.01); A01N 25/02 (2006.01); A01N 43/58 (2006.01); B27K 3/34 (2006.01); B27K 3/50 (2006.01); C08G 18/48 (2006.01)
CPC B27K 3/153 (2013.01) [A01N 25/02 (2013.01); A01N 43/58 (2013.01); B27K 3/343 (2013.01); B27K 3/50 (2013.01); C08G 18/4825 (2013.01)] 12 Claims
 
1. A method for preserving wood comprising:
contacting wood with a wood preservation composition comprising
a) a polyurethane polymer synthesized from
i) a polyol comprising >95% p-propylene oxide, and
ii) an isocyanate
b) an organic solvent; and
c) at least one wood preservative active comprising a halogenated isothiazolone biocide, a halogenated carbamate fungicide an azole fungicide or a combination thereof;
wherein the isocyanate to polyol molar ratio of the polyurethane polymer is from less than or equal to 0.8 to greater than or equal to 0.1.