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    TANNING AGENT
    3.
    发明专利
    TANNING AGENT 未知

    公开(公告)号：AU531362B2

    公开(公告)日：1983-08-18

    申请号：AU5140079

    申请日：1979-10-03

    Applicant: BASF AG

    Inventor： LACH DIETRICH

    IPC: C08G12/04 ,  C08G16/02 ,  C14C3/18 ,  C08G12/08

    Abstract: Mineral tanned leather is frequently retanned with synthetic tanning agents to improve the fullness and softness, but leather retanned by the prior art methods is difficult to dye in full shades with anionic dyes. According to the invention, condensation products of C1-4 aldehydes with certain aromatic sulfonic acids or carboxylic acids containing amino groups are employed for retanning, thereby improving the receptivity of the leather for anionic dyes. These acids have the general formula where X and X' are independently H, -CH2-SO3H or -CH2-OH, A is a benzene radical, Y and Z are independently H, -SO3H or -CO2H, R is H or C1-4-alkyl and n is from 0 to 10, with the proviso that at least one sulfonic acid or carboxyl group is present in the molecule.

    DYEING OF GRAINED LEATHER
    7.
    发明专利
    DYEING OF GRAINED LEATHER 未知

    公开(公告)号：AU527869B2

    公开(公告)日：1983-03-24

    申请号：AU5422779

    申请日：1979-12-28

    Applicant: BASF AG

    Inventor： LACH DIETRICH ,  STREICHER ROLF ,  FEICHTMAYR FRANZ

    IPC: D06P1/41 ,  D06P1/60 ,  D06P3/32 ,  C08L71/02 ,  D06P1/607 ,  D06P1/613

    Abstract: A process for dyeing grain leather with anionic dyes under the conventional conditions for exhaustion methods, in the presence of two specific surfactants. The combined use of the two surfactants results, in the case of cationically tanned (essentially mineral-tanned) leather, in an improvement in the levelness and dye penetration and in the case of anionically tanned (synthetics-tanned or vegetable-tanned) or retanned leather, in an increase in depth of the color. The two surfactants are (a) an aliphatic alcohol of 9 to 24 carbon atoms oxyethylated with from 3 to 120 ethylene oxide units and (b) an aliphatic amine of 8 to 20 carbon atoms oxyethylated with from 6 to 80 ethylene oxide units, and they are used in a weight ratio of a:b of from 1:4 to 4:1 and in a total amount of from 0.3 to 3%, based on shaved weight.

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