EP0015478B2 - Tannins au chrome stables au vieillissement - Google Patents

Tannins au chrome stables au vieillissement Download PDF

Info

Publication number
EP0015478B2
EP0015478B2 EP80100936A EP80100936A EP0015478B2 EP 0015478 B2 EP0015478 B2 EP 0015478B2 EP 80100936 A EP80100936 A EP 80100936A EP 80100936 A EP80100936 A EP 80100936A EP 0015478 B2 EP0015478 B2 EP 0015478B2
Authority
EP
European Patent Office
Prior art keywords
mol
tanning agents
formic acid
chrome tanning
dried
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
EP80100936A
Other languages
German (de)
English (en)
Other versions
EP0015478A1 (fr
EP0015478B1 (fr
Inventor
Herbert Dr. Knopf
Heinrich Dr. Spahrkäs
Wolfhard Dr. Luck
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.)
Bayer AG
Original Assignee
Bayer AG
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6064761&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0015478(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Bayer AG filed Critical Bayer AG
Publication of EP0015478A1 publication Critical patent/EP0015478A1/fr
Application granted granted Critical
Publication of EP0015478B1 publication Critical patent/EP0015478B1/fr
Publication of EP0015478B2 publication Critical patent/EP0015478B2/fr
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
    • C14C3/04—Mineral tanning
    • C14C3/06—Mineral tanning using chromium compounds

Definitions

  • the present invention relates in particular to age-resistant chrome tanning agents, the solubility of which is retained in water even over a long period of time.
  • Tanning agents of this type are characterized by a mild tanning effect and good colorability of the leather produced with them. They are easily soluble in water, but lose this property when stored for a long time. This is disadvantageous for practical use, since chrome tanning agents are generally added to the tanning drums in powder form without prior dissolution. Tannins of the type mentioned which have been stored for a long time then dissolve too slowly or only incompletely in the time available for tanning. This can result in delayed tanning or the formation of spots due to undissolved tanning agent particles on the tanned leather, and the commercial value of the leather is thereby reduced.
  • powdery chrome tanning agents with a formate content of 1.8-2.6 mol / mol Cr 2 0 3 and a basicity of at least 42%, preferably about 50%, which, before drying, have a sulfate content of at least 1, 8 moles of SO 3 / Cr 2 O 3 have been adjusted and then spray-dried, and their solubility is maintained even after prolonged storage.
  • the present invention therefore relates to age-resistant spray-dried chrome tanning agents with a formate content of about 1.8-2.6 mol Cr 2 0 3 and a basicity of at least 42%, which are characterized in that they are spray-dried to a sulfate content of at least 1 , 8 mol S0 3 / mol Cr 2 O 3 can be set.
  • the known powdery chrome tanning agents mentioned at the outset with a formate content of about 2 mol / mol Cr 2 0 3 and a basicity of about 50% have only a sulfate content of about 1.6 mol SO 3 / mol Cr 2 0 3 .
  • the products according to the claims are produced by processes known per se (cf., for example, Ullmann, Enz. Der Techn. Chemie, 4th edition 1975, vol. 9, pp. 614-615).
  • the known chrome tanning agents with a formate content of about 2 mol formate / mol Cr 2 0 3 with a sulfate content of about 1.6 mol SO 3 / mol Cr 2 O 3 can be spray dried to a sulfate content of at least 1.8 mol SO Adjust 3 / MolCr 2 O 3 and then spray dry.
  • the tanning properties of the tanning agents according to the invention do not differ from those of the known formate-masked tanning agents with a lower sulfate content. Accordingly, the tanning agents according to the invention can be used in a customary manner.
  • the tanning agents according to the invention can be used as such, or else in a mixture with base agents, such as magnesium oxide, sodium hydrogen carbonate or dolomite or / and with other masking agents, such as, for. B. salts of dicarboxylic acids.
  • the chrome tanning agents according to the invention are particularly suitable for a tanning process in which very good exhaustion of the chrome broths is achieved by pretanning the pickled pelts with chromium (III) salts and tanning with chromium (III) salts and acid-binding agents.
  • the total amount of chromium oxide offered is about 1.0 to 1.8%, based on the pelvis weight, and the tanning is at a fleet length ⁇ 100% (again based on pelvis weight) and up to a final pH of ⁇ 3 , 6 performed.
  • Powdery chrome tanning agents which are particularly valuable in the practice of leather production and have a particularly long shelf life with regard to solubility in water contain about 1.8-2.4 mol of formate / mol of Cr 2 O and 1.8-2.8 mol of S0 3 / mol of Cr 2 0 3 with a basicity of 48-52%.
  • the present invention is to be explained in more detail with the aid of the following examples.
  • the percentages for the compositions relate to% by weight.
  • 5000 kg of chromium sulfate liquor containing 11% Cr 2 O 3, 14.4% SO 3 , 11.2% NazO and 6.8% formic acid are dried in a spray dryer at an inlet temperature of 200 ° C. and an outlet temperature of 90 ° C.
  • the dried product contains 21.5% Cr 2 O 3 , 13.3% formic acid (2.0 mol formic acids / mol Crz0 3 ) and 2.5 mol SO 3 / mol Cr 2 O 3 with a basicity of 50%.
  • the undissolved residue is 0% when tested immediately and 0.1% after 30 days of rapid aging.
  • the rapid aging and the examination of the release are carried out as described below.
  • the dried product is stored under lock and key in a drying cabinet at 50 ° C. for a period of 30 days.
  • 20 g of the fresh or the so aged product are mixed with 200 ml of water and dissolved for 1 hour at room temperature with shaking Then the residue is determined by weight by filtering through a suction filter.
  • chromium sulfate liquor containing 13% Cr 2 0 3 , 12.6% SO 3 , 6.4% NazO and 8.7% formic acid are dried in a spray dryer at an inlet temperature of 190 ° C. and an outlet temperature of 120 ° C.
  • the dried product contains 28% Cr 2 O 3 , 18.7% formic acid (2.2 mol formic acid / mol Cr 2 0 3 ) and 1.85 mol SO 3 / mol Cr 2 0 3 with a basicity of 50%.
  • the undissolved residue is 0% when checked immediately and 2% after 30 days of rapid aging.
  • chromium sulfate liquor with a content of 11.1% Cr 2 0 3 , 12.2% S0 3 , 8.2% Na 2 O and 7.3% formic acid are in a spray dryer at 190 ° C inlet and 110 ° C outlet temperature dried.
  • the dried product contains 24.4% Cr 2 O 3 , 16% formic acid (2.2 mol formic acid / mol Cr 2 0 3 ) and 2.4 mol SO 3 / mol Crz0 3 with a basicity of 50%.
  • the undissolved residue is 0% when tested immediately and 0.3% after 30 days of rapid aging.

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)

Claims (3)

1. Tanins au chrome en poudre, séchés par pulvérisation, ayant une teneur en formiate d'environ 1,8-2,6 moles de formiate par mole de Cr2O3 et une basicité d'au moins 42%, caractérisés en ce que leur teneur en sulfate est ajustée à une valeur d'au moins 1,8 mole de S03/mole de Cr203 avant le séchage par pulvérisation.
2. Tanins au chrome suivant la revendication 1, caractérisés en ce que leur basicité s'élève à environ 50%.
3. Tanins au chrome suivant l'une des revendications 1 ou 2, caractérisés en ce qu'ils présentent une teneur en sulfate de 1,8 à 2,8 moles de SO3/mole de Cr2O3.
EP80100936A 1979-03-07 1980-02-26 Tannins au chrome stables au vieillissement Expired EP0015478B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19792908967 DE2908967A1 (de) 1979-03-07 1979-03-07 Alterungsbestaendige chromgerbstoffe
DE2908967 1979-03-07

Publications (3)

Publication Number Publication Date
EP0015478A1 EP0015478A1 (fr) 1980-09-17
EP0015478B1 EP0015478B1 (fr) 1981-09-16
EP0015478B2 true EP0015478B2 (fr) 1985-07-31

Family

ID=6064761

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80100936A Expired EP0015478B2 (fr) 1979-03-07 1980-02-26 Tannins au chrome stables au vieillissement

Country Status (12)

Country Link
US (1) US4298344A (fr)
EP (1) EP0015478B2 (fr)
JP (1) JPS6017400B2 (fr)
AR (1) AR219218A1 (fr)
BR (1) BR8001342A (fr)
CA (1) CA1131409A (fr)
DE (2) DE2908967A1 (fr)
ES (1) ES489246A1 (fr)
MX (1) MX155156A (fr)
NZ (1) NZ193032A (fr)
YU (1) YU65180A (fr)
ZA (1) ZA801325B (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57100200A (en) * 1980-12-15 1982-06-22 Nippon Chemical Ind Manufacture of chromium tanning agent
DE3306374A1 (de) * 1983-02-24 1984-08-30 Basf Ag, 6700 Ludwigshafen Verfahren zum gerben von haeuten mit einem hochbasischen chromgerbstoff
FR2721619B1 (fr) * 1994-06-22 1996-08-23 Toulouse Inst Nat Polytech Produit de masquage pour sels métalliques à propriétés tannantes tels que sels de chrome, et procédé de tannage de peaux en milieu aqueux.
KR970010423B1 (ko) * 1995-09-19 1997-06-26 엘지전자 주식회사 식기세척기의 오물 처리방법 및 그 장치

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1230170B (de) * 1960-10-28 1966-12-08 Bayer Ag Gerbverfahren
FR1304531A (fr) * 1961-10-26 1962-09-21 Bayer Ag Procédé de fabrication de cuir

Also Published As

Publication number Publication date
NZ193032A (en) 1982-03-16
JPS6017400B2 (ja) 1985-05-02
JPS55120699A (en) 1980-09-17
DE2908967A1 (de) 1980-09-18
MX155156A (es) 1988-02-01
EP0015478A1 (fr) 1980-09-17
ZA801325B (en) 1981-04-29
YU65180A (en) 1983-01-21
BR8001342A (pt) 1980-11-04
DE3060022D1 (en) 1981-12-03
CA1131409A (fr) 1982-09-14
EP0015478B1 (fr) 1981-09-16
US4298344A (en) 1981-11-03
ES489246A1 (es) 1980-08-16
AR219218A1 (es) 1980-07-31

Similar Documents

Publication Publication Date Title
DE1057439B (de) Verfahren zur Herstellung von wasserfesten Streichpapieren
DE2634126A1 (de) Zubereitungen auf der basis von basischen aluminiumchloriden
EP0015478B2 (fr) Tannins au chrome stables au vieillissement
DE1160410B (de) Verfahren zur Herstellung von Vanadium, Kieselsaeure, Natrium und Kalium enthaltenden Katalysatoren fuer die katalytische Oxydation von Schwefeldioxyd zu Schwefeltrioxyd
CH629185A5 (de) Verfahren zur herstellung des monoalkalimetallsalzes von 8-amino-1-naphthol-3,6-disulfonsaeure.
DE2626429C3 (de) Verfahren zum Chromgerben von Häuten oder Nachgerben von Leder in Gegenwart von Carbonsäuren als Komplexbildner
EP0624203B1 (fr) Tanins diluables au triformiate d'aluminium sous forme hautement concentree soluble aqueuse, stable au stockage, et leur application
DE1230170B (de) Gerbverfahren
DE2528895A1 (de) Verfahren zur herstellung vanadiumarmer alkaliphosphatloesungen
DE955806C (de) Verfahren zur Herstellung eines basisches Chromsulfat enthaltenden Gerbsalzgemisches
CH637694A5 (de) Verfahren zum chromgerben.
CH647259A5 (de) Verfahren zum gerben von tierischen haeuten und fellen mit eisensalzen.
DE608667C (de) Verfahren zur Darstellung von wasserloeslichen Zinkverbindungen der Oxymethansulfinsaeure
DE2758936A1 (de) Gerbmittel und verfahren zum gerben von haeuten
AT99903B (de) Verfahren zur Herstellung in kongo-neutraler Lösung anwendbarer, gerbend wirkender Stoffe.
DE2334636C3 (de) Verfahren zur Herstellung von pulverförmiger! kaltwasserlöslichen basischen Chromgerbstoffen
EP0122501A1 (fr) Procédé pour la production de sulfates basiques de chrome-aluminium
DE1768405C3 (de) Verfahren zur Herstellung von Peressigsäure
DE386469C (de) Verfahren zur Herstellung von Metallsalzen synthetischer Gerbstoffe
DE1079619B (de) Verfahren zur Gewinnung von Citronensaeure aus ihren waessrigen Loesungen
DE587724C (de) Verfahren zur Herstellung von Chromgerbstoffen
DE1286681C2 (de) Verfahren zur Herstellung von Chromledern unter Mitverwendung von kondensierten Phosphaten
DE4428644A1 (de) Verdünnbare Aluminiumtriformiat-Gerbstoffe in hochkonzentrierter und lagerstabiler Form und ihre Verwendung
AT258451B (de) Verfahren zur Herstellung von Chromledern
DE1644408C3 (de) Verfahren zur Herstellung von Äthylauramin

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed
AK Designated contracting states

Designated state(s): DE GB IT

ITF It: translation for a ep patent filed

Owner name: ING. C. GREGORJ S.P.A.

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): DE GB IT

REF Corresponds to:

Ref document number: 3060022

Country of ref document: DE

Date of ref document: 19811203

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

26 Opposition filed

Opponent name: BASF AKTIENGESELLSCHAFT

Effective date: 19820421

PLAB Opposition data, opponent's data or that of the opponent's representative modified

Free format text: ORIGINAL CODE: 0009299OPPO

R26 Opposition filed (corrected)

Opponent name: BASF AKTIENGESELLSCHAFT

Effective date: 19820421

ITF It: translation for a ep patent filed

Owner name: ING. C. GREGORJ S.P.A.

PUAH Patent maintained in amended form

Free format text: ORIGINAL CODE: 0009272

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT MAINTAINED AS AMENDED

27A Patent maintained in amended form
AK Designated contracting states

Kind code of ref document: B2

Designated state(s): DE GB IT

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19940112

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19940216

Year of fee payment: 15

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19950226

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19950226

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19951101

RDAH Patent revoked

Free format text: ORIGINAL CODE: EPIDOS REVO