中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

18 records (took 0.019 seconds)

    2.
    发明专利
    未知

    公开(公告)号：DE3129083A1

    公开(公告)日：1983-02-10

    申请号：DE3129083

    申请日：1981-07-23

    Applicant: BASF AG

    Inventor： NAARMANN HERBERT DIPL CHEM DR ,  HAMBRECHT JUERGEN DIPL CHEM DR ,  RIEBER NORBERT DIPL CHEM DR

    IPC: C08G65/00 ,  C08G65/38 ,  C08G65/44

    Abstract: A process for the preparation of high molecular weight polyphenylene ethers from monohydric phenols which have alkyl substituents in both ortho-positions and may additionally have an alkyl substituent in one meta-position but not in the para-position, by an oxidative coupling reaction, employing oxygen, at from 10 DEG to 25 DEG C., in the presence of a catalyst complex comprising a copper salt and an N-substituted imidazole, in the presence of an aromatic C8-C10-hydrocarbon solvent. N-Methylimidazole, N-ethylimidazole, N-isopropylimidazole, N-n-butylimidazole, N-cyclohexylimidazole, N-octylimidazole and N-phenylimidazole are preferably used as the imidazole, advantageously in amounts of from 0.5 to 5 percent by weight.

    Process for the preparation of polyphenylene ethers
    10.
    发明专利
    Process for the preparation of polyphenylene ethers 未知

    公开(公告)号：DE3314711A1

    公开(公告)日：1983-10-27

    申请号：DE3314711

    申请日：1983-04-22

    Applicant: BASF AG

    Inventor： HAMBRECHT JUERGEN DIPL CHEM DR ,  MUENCH VOLKER DIPL CHEM DR ,  NAARMANN HERBERT DIPL CHEM DR ,  RIEBER NORBERT DIPL CHEM DR ,  SWOBODA JOHANN DIPL CHEM DR

    IPC: C08G65/44

    Abstract: The invention relates to a process for the preparation of high-molecular-weight polyphenylene ethers from monohydric phenols containing alkyl substituents, by oxidative coupling reaction with oxygen at temperatures between 10 and 50 DEG C, in the presence of a copper salt/amine catalyst complex and in the presence of an aromatic C6-to C10-hydrocarbon as solvent, where the amine component employed is a diamine of the formula R NH-R -NHR where R and R are tertiary alkyl and/or cycloalkyl groups having 4 to 12 carbon atoms, and R is an alkylene group having 2 to 4 carbon atoms in the connecting chain, in amounts of from 0.1 to 5% by weight, based on the phenol. Suitable amine components are N,N'-di-tert-alkylethylenediamines, in particular N,N'-di-tert-butylethylenediamine.

Patent Agency Ranking