US 11,814,467 B2
Process for the production of polyurethane foams
Pranaya Man Singh Pradhan, Bangalore (IN); Eswaramurthi Nachiappan, Bangalore (IN); Michiel Barend Eleveld, Amsterdam (NL); and Prem Kumar Dhanapal, Bangalore (IN)
Assigned to SHELL USA, INC., Houston, TX (US)
Appl. No. 16/063,952
Filed by SHELL OIL COMPANY, Houston, TX (US)
PCT Filed Dec. 19, 2016, PCT No. PCT/EP2016/081785
§ 371(c)(1), (2) Date Jun. 19, 2018,
PCT Pub. No. WO2017/108711, PCT Pub. Date Jun. 29, 2017.
Claims priority of application No. 6795/CHE/2015 (IN), filed on Dec. 21, 2015.
Prior Publication US 2020/0270391 A1, Aug. 27, 2020
Int. Cl. C08G 18/48 (2006.01); C08G 18/76 (2006.01)
CPC C08G 18/4816 (2013.01) [C08G 18/485 (2013.01); C08G 18/7621 (2013.01); C08G 2110/0083 (2021.01)] 5 Claims
 
1. A process for the production of a polyurethane foam having a resilience of at least 50% measured by ball rebound test, said process comprising (1) reacting (i) a first polyether polyol comprising polyether chains containing at least 3 wt % and no more than 20 wt % oxyethylene content, and having a primary hydroxyl content of no more than 20% and a functionality of at most 3.5 and a hydroxyl value of at least 40 mg KOH/g; (ii) a second polyether polyol comprising polyether chains containing at least 50 wt % oxyethylene content and having a hydroxyl value of at most 48 mg KOH/g; and (iii) one or more aromatic polyisocyanates, in the presence of one or more catalysts having gelling and/or blowing activities, and (2) allowing a full rise of the foam, wherein the weight ratio of the first polyether polyol to the second polyether polyol is at least 5:1, and wherein the first polyether polyol is prepared by ring-opening polymerisation of alkylene oxides onto a hydroxyl containing starting material in the presence of a composite metal cyanide complex catalyst.