US 12,421,367 B2
Polyurethane rigid foam
Dakai Ren, Manvel, TX (US); and William J. Harris, Lake Jackson, TX (US)
Assigned to Dow Global Technologies LLC, Midland, MI (US)
Appl. No. 17/778,456
Filed by Dow Global Technologies LLC, Midland, MI (US)
PCT Filed Feb. 15, 2021, PCT No. PCT/US2021/018091
§ 371(c)(1), (2) Date May 20, 2022,
PCT Pub. No. WO2021/167857, PCT Pub. Date Aug. 26, 2021.
Claims priority of provisional application 62/977,532, filed on Feb. 17, 2020.
Prior Publication US 2022/0411599 A1, Dec. 29, 2022
Int. Cl. C04B 26/16 (2006.01); C08G 18/18 (2006.01); C08G 18/20 (2006.01); C08G 18/22 (2006.01); C08G 18/28 (2006.01); C08G 18/30 (2006.01); C08G 18/48 (2006.01); C08G 18/76 (2006.01); C08J 9/00 (2006.01); C08J 9/12 (2006.01); C08L 75/08 (2006.01)
CPC C08J 9/0085 (2013.01) [C08G 18/2063 (2013.01); C08G 18/4829 (2013.01); C08G 18/7671 (2013.01); C08J 9/125 (2013.01); C08G 2110/0025 (2021.01); C08G 2110/0083 (2021.01); C08J 2203/10 (2013.01); C08J 2205/10 (2013.01); C08J 2375/08 (2013.01)] 9 Claims
 
1. A foam-forming composition for producing a polyurethane rigid molded foam article for making structural construction materials, the foam-forming composition comprising:
(a) at least one isocyanate component; and
(b) at least one isocyanate-reactive component comprising an isocyanate-reactive composition including:
(bi) a rigid polyol blend having a nominal hydroxyl functionality from 3 to 10 and a hydroxyl number from 125 mg KOH/g to 800 mg KOH/g, the the rigid polyol blend comprising at least the following:
(bi1) a first rigid polyether polyol having a nominal hydroxyl functionality of 5 and a hydroxyl number from 300 mg KOH/g to 450 mg KOH/g,
(bi2) a second rigid polyether polyol having a nominal hydroxyl functionality of 7 and a hydroxyl number from 300 mg KOH/g to 450 mg KOH/g, and
(bi3) a third rigid polyether polyol having a nominal hydroxyl functionality of 3 and a hydroxyl number from 600 mg KOH/g to 800 mg KOH/g; and
(bii) at least one flexible polyol compound having a nominal hydroxyl functionality from 2 to 3 and having a hydroxyl number from 20 mg KOH/g to 100 mg KOH/g;
(c) a catalyst package comprising at least one latent gelling catalyst; and
(d) at least one blowing agent;
wherein an isocyanate index of the foam-forming composition is from 90 to 400 and the polyurethane rigid molded foam article has a molded foam density of from 100 kg/m3 to 1000 kg/m3 according to ASTM D1622.