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    Tanning process
    6.
    发明专利
    Tanning process 未知

    公开(公告)号：GB1090606A

    公开(公告)日：1967-11-08

    申请号：GB2967866

    申请日：1966-07-01

    Applicant: BASF AG

    Inventor： ENDRES HORST ,  LEPPMEIER FRANZ ,  ERDMANN HANS

    IPC: C14C3/08

    Abstract: In a process for the complete tanning of material such as animal hides, pelts, fur skins and furs, and the re-tanning of leather, the material is treated with between 1 and 30% of its weight of a methylol derivative of a mononuclear phenol or a binuclear phenol compound containing, in each nucleus, not more than one phenolic hydroxyl group, and being free from anionic groups and condensed rings, in a weakly acidic to weakly alkaline aqueous solution, e.g. having a pH between 6 and 9. The solution may contain up to 50%, by weight of a water-soluble organic solvent, such as methanol, ethanol and acetone. Suitable derivatives are: mono-, di- or polymethylol derivatives of phenol, cresols, xylenols, thymol, carvacrol, halophenols, phenylphenols, monohydroxy- and dihydroxy-diphenylmethanes, dihyroxy-diphenylpropanes. Particularly suitable derivatives are: monomethylol- and dimethylol-4, 4' dihydroxy-diphenyl sulphone. missing page 170

    Oxidative unhairing of hides and skins
    8.
    发明专利
    Oxidative unhairing of hides and skins 未知

    公开(公告)号：GB1067798A

    公开(公告)日：1967-05-03

    申请号：GB3829865

    申请日：1965-09-08

    Applicant: BASF AG

    Inventor： MILLER FRANZ-FRIEDRICH ,  LIDLE HELMUT ,  LEPPMEIER FRANZ

    IPC: C14C1/06

    Abstract: Hides and skins are depilated in an aqueous medium with compounds (e.g. sodium chlorite) which split off chlorine dioxide in the presence of an acid, the acid used being one which does not tan or swell the hides. The hides may be immersed in a mixture of the solutions of the chlorine dioxide yielding substance and acid or in the solution of the chloride dioxide yielding substance or acid alone before the addition of the other. The pH of the treating composition may be raised to dissolve the damaged hair or the pH may be adjusted to allow the hides to be tanned. The acid may be produced in the treating medium by adding to the treating medium a salt which gives the desired acid on the addition of an acid or acid salt (e.g. sulphuric, phosphoric, acetic or trichloroacetic acid or potassium or sodium hydrogen sulphate). Suitable non-swelling acids are sulphuric and/or carboxylic acids of the benzene series containing hydroxy, amaino or nitro groups and/or halogen atoms and sulphuric acids of the napthalene series which contain the said substituents (long list of such acids given) and linear polyphosphoric acids.

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