公开(公告)号：DE19838450A1

公开(公告)日：2000-03-02

申请号：DE19838450

申请日：1998-08-25

Applicant: BASF AG

Inventor： FALKE PETER ,  HENDREICH REGINA ,  ROTERMUND INGE

IPC: B29C33/64 ,  C08G18/10 ,  C08G18/48 ,  C08G18/61 ,  C08G18/08 ,  C08L75/04 ,  C08J9/34

Abstract: Polyurethane (PU) soft foam preparation involves contacting an optionally modified organic polyisocyanate(s), a compound(s) with at least two active H atoms, propellants, catalysts and aids to a mold surface coated with a release agent comprising an ethylene oxide-rich polyol(s) of ethylene oxide content at least 30 wt.% and/or silicone-containing stabilizer. An Independent claim is included for the obtained PU soft foams.

公开(公告)号：DE19823393A1

公开(公告)日：1999-12-02

申请号：DE19823393

申请日：1998-05-26

Applicant: BASF AG

Inventor： REICHELT MICHAEL ,  ROTERMUND UDO ,  HEMPEL RENATE ,  FALKE PETER ,  MALOTKI PETER VON ,  SEIFERT HOLGER

IPC: C08G18/10 ,  C08G18/48 ,  C08G18/50 ,  C08G18/76 ,  C09K3/10 ,  C08L75/04

Abstract: The invention relates to prepolymers which contain isocyanate groups and which can be produced by reacting an isocyanate mixture, said mixture being predominantly comprised of diphenylmethane diisocyanates and polyphenyl polymethylene polyisocyanates, with a maximum proportion of two-core isomers of 74 wt.% with at least 4 functional polyols or with a mixture of polyols having an average functionality of at least 4. The polyols or polyol mixture comprise(s) a hydroxyl value ranging from 200 to 1650 mg KOH/g and an average molar mass of less than 1100 g/mol with an NCO content of at least 30.0 wt.%. In addition, the invention relates to a method for producing these prepolymers which contain isocyanate groups, to their use for producing polyurethanes, and to a method for producing polyurethanes by reacting at least one of the inventive prepolymers which contain isocyanate groups, optionally mixed with additional organic and/or modified organic isocyanates (a), with compounds having at least two reactive hydrogen atoms (b) in the presence of optional expanding agents (c), catalysts (d), optional additional auxiliary agents and/or additives (e).

公开(公告)号：DE19811472A1

公开(公告)日：1999-09-23

申请号：DE19811472

申请日：1998-03-17

Applicant: BASF AG

Inventor： FALKE PETER ,  HENDREICH REGINA ,  SCHUSTER MARITA ,  OSWALD OTTO ,  SCHMUTZER KLAUS

IPC: C08G18/40 ,  C08G18/66 ,  D06N3/14 ,  C08G18/64 ,  C08G18/38 ,  C08G18/48 ,  C08G18/32 ,  C08L75/00 ,  C08J9/14 ,  B29C44/12

Abstract: The polyol component in a low-penetration polyurethane (PUR) reaction mixture used for foam-backing sheet materials comprises a polyol containing dispersed ureas obtained by reacting NH-functional compounds with isocyanates. A process for foam-backing sheet materials with PUR showing a reduced depth of penetration comprises coating porous sheet material with a reaction mixture containing (a) polyisocyanate(s), (b) compound(s) with at least 2 reactive hydrogen atoms, optionally (c) blowing agents, (d) catalysts and (e) other additives etc. and allowing the mixture to react on the substrate. Component (b) is a polyol containing dispersed ureas obtained by reacting NH-functional compounds with isocyanates. An Independent claim is also included for a PUR foam-backing system with a reduced depth of penetration, containing components (a)-(e) as above.