公开(公告)号：US20190248948A1

公开(公告)日：2019-08-15

申请号：US16397373

申请日：2019-04-29

Applicant: PROPRIETECT L.P.

Inventor： JING ZHANG ,  Dorota Ulman

IPC: C08G18/08 ,  C08G18/76 ,  C08G18/20 ,  C08G18/48 ,  C08G18/18 ,  C08G18/66

CPC classification number: C08G18/14 ,  C08G18/1825 ,  C08G18/1833 ,  C08G18/2063 ,  C08G18/4883 ,  C08G18/6677 ,  C08G18/7621 ,  C08G18/7664 ,  C08G18/7671 ,  C08G2101/0008 ,  C08G2101/005 ,  C08G2101/0083

Abstract: There is described a process for producing a free-rise polyurethane foam having a density of less than or equal to about 0.75 pcf. the process comprises the steps of: (a) contacting: (i) an isocyanate, (ii) a first polyol comprising a first polymer chain consisting essentially of propylene oxide units and alkylene oxide units selected from ethylene oxide, butylene oxide and mixtures thereof in a weight ratio of propylene oxide units to alkylene oxide units in the range of from about 90:10 to about 25:75, the polymer chain being terminally capped with the ethylene oxide units, the first polyol having a primary hydroxyl content of at least about 70% based on the total hydroxyl content of the first polyol, (iii) water (iv) a surfactant and (v) a catalyst to form a foamable reaction mixture; and (b) expanding the foamable reaction mixture to produce the free-rise polyurethane foam.