21.
    发明专利
    未知

    公开(公告)号:DE3742265A1

    公开(公告)日:1989-06-22

    申请号:DE3742265

    申请日:1987-12-12

    Applicant: BASF AG

    Abstract: The cysteamine acid addition salts are prepared by reaction of aziridine with an organic sulphur compound of oxidation state -2 and with a ketone, followed by acid hydrolysis of the thiazolidine formed as intermediate, the aziridine and the ketone being reacted with ammonium hydrogen sulphide or a metal hydrogen sulphide with the addition of a medium to strong acid at a temperature of -10 to +100 DEG C and a pH of greater than or equal to 8.5 being maintained.

    Aqueous quenching medium for hardening metals

    公开(公告)号:DE3429611A1

    公开(公告)日:1986-02-20

    申请号:DE3429611

    申请日:1984-08-11

    Applicant: BASF AG

    Abstract: An aqueous quenching medium for hardening metals by heat treatment contains a solution of 0.1 to 30% by weight of a polyether compound having a molecular weight of more than 5000 and additionally 0.1 to 30% by weight of an at least partially hydrolysed alkali metal metaphosphate and/or of an oligomeric alkali metal phosphate. Only a very labile vapour skin phase or virtually none at all forms in these quenching media when heated metals are cooled.

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