23.
    发明专利
    未知

    公开(公告)号:DE59708777D1

    公开(公告)日:2003-01-02

    申请号:DE59708777

    申请日:1997-08-26

    Applicant: BASF AG

    Abstract: A process for preparing a polyamide by reacting at least one aminonitrile with water comprises:(1) reacting at least one aminonitrile with water at a temperature from 100 to 360° C. and a pressure from 0.1 to 35x106 Pa to obtain a reaction mixture,(2) further reacting the reaction mixture at a temperature from 150 to 400° C. and a pressure which is lower than the pressure in step 1, the temperature and the pressure being selected so as to obtain a first gas phase and a first liquid or a first solid phase or a mixture of first solid and first liquid phase, and the first gas phase is separated from the first liquid or the first solid phase or from the mixture of first liquid and first solid phase, and(3) admixing the first liquid or the first solid phase or the mixture of first liquid and first solid phase with a gaseous or liquid phase comprising water at a temperature from 150 to 360° C. and a pressure from 0.1 to 30x106 Pa to obtain a product mixture.

    26.
    发明专利
    未知

    公开(公告)号:AT218592T

    公开(公告)日:2002-06-15

    申请号:AT99916829

    申请日:1999-03-18

    Applicant: BASF AG

    Abstract: A process for preparing polyamides comprises polymerizing starting monomers or starting oligomers in the presence of at least one compound of the formula (I)whereR is a functional group R which bears 1-4 identical or different amide-forming groups R ,R is H, C1-C20-alkyl, cycloalkyl, benzyl or OR , where R is H, C1-C20-alkyl, cycloalkyl or benzyl,R , R , R and R are independently C1-C10-alkyl,n is a natural number greater than 1, andthe piperidine derivatives attached to R are identical or different with regard to the substituents, meaning R , R , R , R and R .The polyamides are useful for preparing filaments, fibers, films, sheetlike structures and moldings.

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