中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

15 records (took 0.021 seconds)

    Preparation of cellularpolyurethane elastomers based on 3,3'-dimethoxy-4,4'-diisocyanatobiphenyl and/or stilbene 4,4'-diisocyanate
    11.
    发明专利
    Preparation of cellularpolyurethane elastomers based on 3,3'-dimethoxy-4,4'-diisocyanatobiphenyl and/or stilbene 4,4'-diisocyanate 未知

    公开(公告)号：ZA976164B

    公开(公告)日：1999-01-11

    申请号：ZA976164

    申请日：1997-07-11

    Applicant: BASF AG

    Inventor： GENZ MANFRED ,  MERGER ROLAND ,  BOLLMANN HEINZ ,  THAERIGEN RAINA ,  VOELKEL RUEDIGER ,  KRAUS RUPERT ,  POHL SIEGMUND

    IPC: C08G18/77 ,  C08J9/00 ,  C08G ,  C08J

    Abstract: Production of microcellular polyurethane elastomers is claimed by reacting (A) high mol. polyhydroxy compounds and optionally (B) low. mol. chain extenders and/or crosslinkers with (C) 3,3'-dimethoxy-4,4'- diisocyanato-diphenyl in presence or absence of (D) catalysts, foaming agents etc.. Preferably the polyhydroxy component (A) is of functionality 2-3 and mol. wt. 500-6,000 and is especially a difunctional polyester polyol, OH-containing polycarbonate or polyoxybutylene glycol of mol. wt. 800-3,500 while the chain extender is an alkane diol, dialkylene glycol or polyoxyalkylene glycol of mol. wt. up to 800 and the crosslinker is also of mol. wt. up to 800 and is a tri-or tetra-hydric alcohol or polyoxyalkylene polyol of functionality 3-4. Preparation of the elastomer is by: (1) first preparing a prepolymer of NCO content 2-20 wt.% by reacting (C) with (A) and optionally (B) and then reacting this prepolymer with water and optionally also (B); or (2) first reacting (C) with part of (A) and optionally also (B) and then reacting the prepolymer obtained with a mixture of water, the remainder of (A) and optionally also (B).

Patent Agency Ranking