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：US20200254659A1

公开(公告)日：2020-08-13

申请号：US16642489

申请日：2013-09-13

Applicant: BASF SE

Inventor： Sebastian Richter ,  Achim Besser ,  Sebastian Alexander Weisse ,  Johannes Poppenberg ,  Johann Martin Szeifert ,  Markus Susoff ,  Steffen Mayer ,  Markus Schuette ,  Heinz-Dieter Lutter

IPC: B29C44/34 ,  B29C44/56 ,  B29C51/02

Abstract: Described herein is a process for preparing a foam (FA) with a Poisson's ratio in the range of from −0.5 to 0.3, the method including the steps of providing a foam (F1) with a flow resistance in the range of from 3000 to 8000 Pas/m, determined according to DIN EN 29053, and subjecting the foam (F1) to thermoforming including triaxial compression, wherein the foam (F1) is not reticulated prior to step (ii). Also described herein is the foam obtained or obtainable according to the process and the use of the foam as, for example, an energy absorbing device, preferably in protective gear, furniture, cushions, in cleaning devices with improved rinse-out behavior, in shoe soles, or as sealing, insulating or anchorage providing material for example used in earphones, ear plugs or dowels, or as acoustic material.