GB798779A - Improvements in or relating to the tanning of leather - Google Patents

Improvements in or relating to the tanning of leather

Info

Publication number
GB798779A
GB798779A GB1076/56A GB107656A GB798779A GB 798779 A GB798779 A GB 798779A GB 1076/56 A GB1076/56 A GB 1076/56A GB 107656 A GB107656 A GB 107656A GB 798779 A GB798779 A GB 798779A
Authority
GB
United Kingdom
Prior art keywords
urea
formaldehyde
melamine
aldehyde
condensation product
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
GB1076/56A
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.)
ST LAWRENCE CORP Ltd
Original Assignee
ST LAWRENCE CORP Ltd
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 ST LAWRENCE CORP Ltd filed Critical ST LAWRENCE CORP Ltd
Publication of GB798779A publication Critical patent/GB798779A/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
    • C14C3/24—Chemical tanning by organic agents using lignin derivatives, e.g. sulfate liquor

Landscapes

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

Abstract

798,779. Tanning. ST. LAWRENCE CORPORATION, Ltd. Jan. 12, 1956 [Jan. 26, 1955], No. 1076/56. Addition to 777,474. Class 76. Leather stock is tanned by impregnating with an aqueous solution of an aldehyde and melamine, or of an aldehyde-melamine condensation product, and a lignin material and precipitating a water-insoluble reaction product within and on the stock by adjusting the pH. The lignin may be derived from various specified processes as in the parent Specification. Suitable aldehydes are formaldehyde (or compounds such as paraformaldehyde, trioxymethylene and hexamethylene-tetramine which yield formaldehyde) acetaldehyde, furfural (which produces a black tan), glyoxal and crotonaldehyde. Solid compounds yielding formaldehyde are useful if it is desired to employ dry mixtures for subsequent use. A plurality of aldehydes may be used together. In the examples, malamineformaldehyde condensation products are used together with aqueous formaldehyde or paraformaldehyde, and precipitation is achieved by neutralization, in some cases with dilute hydrochloric acid, to a pH below 3. The melamine or condensation product thereof may be partially replaced with a dibasic acid amide or condensation product thereof with an aldehyde (see parent Specification). Suitable dibasic acid amides &c. are urea, monomethyl urea, dimethylol urea and sesquimethylol urea, and an equimolar mixture of urea and melamine with 4 mols. of formaldehyde is specified. In some examples, urea and/or a urea-formaldehyde resin is/are also present, and in one case caustic soda is also added. Suitable leather stock may be bated, limed or pickled skins.
GB1076/56A 1955-01-26 1956-01-12 Improvements in or relating to the tanning of leather Expired GB798779A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US798779XA 1955-01-26 1955-01-26

Publications (1)

Publication Number Publication Date
GB798779A true GB798779A (en) 1958-07-30

Family

ID=22153378

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1076/56A Expired GB798779A (en) 1955-01-26 1956-01-12 Improvements in or relating to the tanning of leather

Country Status (1)

Country Link
GB (1) GB798779A (en)

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