THE CONTINUOUS PRODUCTION OF LOW MOLECULAR WEIGHT POLYAMIDES

    公开(公告)号:CA2166314A1

    公开(公告)日:1995-01-12

    申请号:CA2166314

    申请日:1994-06-20

    Applicant: BASF AG

    Abstract: A process is disclosed for continuously preparing polyamides from a mixture of at least one lactam and water, as well as if required other monomer units and/or usual additives and fillers in polyamide-forming conditions. The mixture of initial substances is heated in the liquid phase in a first reaction zone until a conversion rate of at least 70% is reached, then is adiabatically expanded and further polymerised in another reaction zone. In the first reaction zone, 0.5 to 7 % by weight water are added to the mixture, the mixture is heated up to a temperature range from 220 to 310 .degree.C and polymerised until a conversion rate of at least 85 % is reached. In the second reaction zone, after the mixture is expanded, it is further polymerised at temperatures in a range from 215 to 300 .degree.C without further heating.

    18.
    发明专利
    未知

    公开(公告)号:AT177445T

    公开(公告)日:1999-03-15

    申请号:AT94920959

    申请日:1994-06-20

    Applicant: BASF AG

    Abstract: PCT No. PCT/EP94/01998 Sec. 371 Date Dec. 28, 1995 Sec. 102(e) Date Dec. 28, 1995 PCT Filed Jun. 20, 1994 PCT Pub. No. WO95/01389 PCT Pub. Date Jan. 12, 1995A process for the continuous production of polyamides from a mixture of at least one lactam and water and, if required, other monomer units and/or conventional additives and fillers under polyamide-forming conditions, where the mixture of the starting materials is heated in liquid phase in a first reaction zone until a conversion of at least 70% is reached, and undergoes adiabatic decompression and further polymerization in another reaction zone, wherein, in the first reaction zone, 0.5-7% by weight of water are employed, the temperature is increased to the range from 220 DEG to 310 DEG C., and polymerization is carried out until a conversion of at least 85% is reached and, in the second reaction zone, after the decompression further polymerization is carried out in the range from 215 DEG to 300 DEG C. without heat input.

    20.
    发明专利
    未知

    公开(公告)号:DE4321683A1

    公开(公告)日:1995-01-12

    申请号:DE4321683

    申请日:1993-06-30

    Applicant: BASF AG

    Abstract: PCT No. PCT/EP94/01998 Sec. 371 Date Dec. 28, 1995 Sec. 102(e) Date Dec. 28, 1995 PCT Filed Jun. 20, 1994 PCT Pub. No. WO95/01389 PCT Pub. Date Jan. 12, 1995A process for the continuous production of polyamides from a mixture of at least one lactam and water and, if required, other monomer units and/or conventional additives and fillers under polyamide-forming conditions, where the mixture of the starting materials is heated in liquid phase in a first reaction zone until a conversion of at least 70% is reached, and undergoes adiabatic decompression and further polymerization in another reaction zone, wherein, in the first reaction zone, 0.5-7% by weight of water are employed, the temperature is increased to the range from 220 DEG to 310 DEG C., and polymerization is carried out until a conversion of at least 85% is reached and, in the second reaction zone, after the decompression further polymerization is carried out in the range from 215 DEG to 300 DEG C. without heat input.

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