公开(公告)号：US10927212B2

公开(公告)日：2021-02-23

申请号：US16300693

申请日：2017-05-02

Applicant: BASF SE

Inventor： Udo Hadick ,  Heinz-Dieter Lutter ,  Stefanie Hiller ,  Maike Grever

IPC: C08G18/10 ,  C08G18/08 ,  C08G18/18 ,  C08G18/32 ,  C08G18/48 ,  C08G18/76 ,  C08G18/79 ,  C08J9/12 ,  C08G101/00

Abstract: Provided herein is a process for producing viscoelastic polyurethane foams having a density of from 100 g/dm3 to 300 g/dm3, in which (a) polyisocyanate is mixed with (b) polymeric compounds having groups that are reactive toward isocyanates, (d) a catalyst, and (e) a blowing agent including water at an isocyanate index of from 50 to 95 to give a reaction mixture. The reaction mixture is placed in a mold and reacted to give the flexible polyurethane foam, wherein the polyisocyanate (a) is obtainable by mixing 4,4′-MDI and oligomers of propylene oxide having from 2 to 8 propylene oxide units. The polymeric compounds (b) include at least one polyalkylene oxide having a hydroxyl number of from 20 to 50 mg KOH/g derived from a trifunctional starter molecule and a proportion of ethylene oxide, based on the content of alkylene oxide, of from 0 to 10% by weight.

公开(公告)号：US20200181315A1

公开(公告)日：2020-06-11

申请号：US16300693

申请日：2017-05-02

Applicant: BASF SE

Inventor： Udo Hadick ,  Heinz-Dieter Lutter ,  Stefanie Hiller ,  Maike Grever

IPC: C08G18/10 ,  C08G18/18 ,  C08G18/08 ,  C08J9/12 ,  C08G18/48 ,  C08G18/32 ,  C08G18/76 ,  C08G18/79

Abstract: Provided herein is a process for producing viscoelastic polyurethane foams having a density of from 100 g/dm3 to 300 g/dm3, in which (a) polyisocyanate is mixed with (b) polymeric compounds having groups that are reactive toward isocyanates, (d) a catalyst, and (e) a blowing agent including water at an isocyanate index of from 50 to 95 to give a reaction mixture. The reaction mixture is placed in a mold and reacted to give the flexible polyurethane foam, wherein the polyisocyanate (a) is obtainable by mixing 4,4′-MDI and oligomers of propylene oxide having from 2 to 8 propylene oxide units. The polymeric compounds (b) include at least one polyalkylene oxide having a hydroxyl number of from 20 to 50 mg KOH/g derived from a trifunctional starter molecule and a proportion of ethylene oxide, based on the content of alkylene oxide, of from 0 to 10%.