GB745626A - Improved process for the production of light-fast tanning substances - Google Patents

Improved process for the production of light-fast tanning substances

Info

Publication number
GB745626A
GB745626A GB20322/51A GB2032251A GB745626A GB 745626 A GB745626 A GB 745626A GB 20322/51 A GB20322/51 A GB 20322/51A GB 2032251 A GB2032251 A GB 2032251A GB 745626 A GB745626 A GB 745626A
Authority
GB
United Kingdom
Prior art keywords
acid
formaldehyde
condensation product
para
condensed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB20322/51A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Progil SARL
Original Assignee
Progil SARL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Progil SARL filed Critical Progil SARL
Publication of GB745626A publication Critical patent/GB745626A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
    • C14C3/00—Tanning; Compositions for tanning
    • C14C3/02—Chemical tanning
    • C14C3/08—Chemical tanning by organic agents
    • C14C3/18—Chemical tanning by organic agents using polycondensation products or precursors thereof
    • C14C3/20—Chemical tanning by organic agents using polycondensation products or precursors thereof sulfonated

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Coloring (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)
  • Phenolic Resins Or Amino Resins (AREA)

Abstract

A water-soluble tanning agent is made by reacting together in an acid medium (1) a condensation product of para-cresol sulphonic acid with formaldehyde with (2) a condensation product of phenol or 4,41-dihydroxy diphenylsulphone with formaldehyde; the molecular proportions of para-cresol sulphonic acid to phenol being between 0.7:1 and 1.5:1 or of para-cresol sulphonic acid to 4,41-dihydroxy-diphenyl-sulphone being substantially 2:1. The reaction may be performed in presence of urea. When reaction is complete the product is neutralized and acidified with an organic acid, e.g. formic, acetic or oxalic acid. The products may be clarified with sodium hydrosulphite, spray dried or fluidized by the addition of naphthalene monosulphonic acid or tetrahydronaphthalene monosulphonic acid. In examples: (1) and (2) phenol and formalin are condensed in presence of oxalic acid and after removing water the condensation product is reacted with a condensation product of paracresol sulphonic acid and formaldehyde; (3) the reaction of examples 1 and 2 is performed in presence of urea; (4) tetrahydronaphthalene is added to the product of example 1; (5) dihydroxydiphenylsulphone, sodium bisulphite or sodium sulphite, and formalin are condensed in presence of caustic soda, then sulphuric acid is added and the upper aqueous layer removed; this condensation product is then condensed with a condensation product of para-cresol sulphonic acid and formaldehyde in presence of urea and additional formaldehyde; (6) dihydroxydiphenylsulphone is condensed with formaldehyde in presence of caustic soda, sodium bisulphite, additional formaldehyde and additional caustic soda are added and condensation continued; the resulting condensation product is precipitated with sulphuric acid and reacted with a condensation product of para-cresol sulphonic acid and formaldehyde as in example 5.
GB20322/51A 1951-04-18 1951-08-28 Improved process for the production of light-fast tanning substances Expired GB745626A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR745626X 1951-04-18

Publications (1)

Publication Number Publication Date
GB745626A true GB745626A (en) 1956-02-29

Family

ID=9146990

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20322/51A Expired GB745626A (en) 1951-04-18 1951-08-28 Improved process for the production of light-fast tanning substances

Country Status (1)

Country Link
GB (1) GB745626A (en)

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