GB893338A - Synthetic tanning agents - Google Patents
Synthetic tanning agentsInfo
- Publication number
- GB893338A GB893338A GB28032/58A GB2803258A GB893338A GB 893338 A GB893338 A GB 893338A GB 28032/58 A GB28032/58 A GB 28032/58A GB 2803258 A GB2803258 A GB 2803258A GB 893338 A GB893338 A GB 893338A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phenol
- formaldehyde
- mole
- sulphone
- bis
- 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
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)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Abstract
A synthetic tanning agent comprises the condensation products of a diaryl sulphone having the formula <FORM:0893338/IV (a)/1> -wherein R and R1 may be the same or different and represent a hydrogen atom or a methyl radical-and a neutralized, partially disulphonated derivative of a bis-phenol of formula <FORM:0893338/IV (a)/2> -wherein R2 is a methyl or ethyl radical and R3 is as R and R1 above-the degree of sulphonation being an average of 75 to 85% of the theoretical amount for a disulphonated bis-phenol. The tanning agent is prepared by reacting 0,75 to 1 mole of the sulphone with 1 mole of the sulphonic acid salt and with 1,5 to 2 moles of formaldehyde in the three stages (1) using 0,5 to 0,7 mole of formaldehyde, a reaction time of 4 to 5 hours and a weakly acid or weakly basic medium, (2) using 0,5 to 0,7 mole of formaldehyde, a reaction time of 2 to 4 hours and a neutral medium and (3) using 0,5 to 0,7 moles of formaldehyde, a reaction time of 4 to 5 hours and a weakly acid or weakly basic medium, the pH of the medium for stage (3) being the opposite to that used in stage (1). The formaldehyde for the condensation may be provided by formalin, para formaldehyde, trioxane or monomethylol dimethyl hydantoin. In Example I the sulphone is prepared from phenol and 100% sulphuric acid and the sulphonated bis-phenol from 2,2 bis(p-hydroxyphenyl)propane and 98% sulphuric acid. The phenol used to prepare the sulphone in Example II is a mixture of phenol itself and a technical cresol containing 54% m-cresol, 29% p-cresol and the remainder other phenols containing o-cresol and phenol. Specifications 481,308 and 615,190 are referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US893338XA | 1957-09-09 | 1957-09-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB893338A true GB893338A (en) | 1962-04-04 |
Family
ID=22217092
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB28032/58A Expired GB893338A (en) | 1957-09-09 | 1958-09-01 | Synthetic tanning agents |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB893338A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT202200000938A1 (en) * | 2022-03-24 | 2023-09-24 | Bi Qem Specialties S P A | Leather tanning or retanning compound with cyclodextrin-based inclusion compound |
-
1958
- 1958-09-01 GB GB28032/58A patent/GB893338A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT202200000938A1 (en) * | 2022-03-24 | 2023-09-24 | Bi Qem Specialties S P A | Leather tanning or retanning compound with cyclodextrin-based inclusion compound |
EP4249553A1 (en) * | 2022-03-24 | 2023-09-27 | SPECIALTIES S.p.A. BI-QEM | Leather or retanning compound with cyclodextrin-based inclusion compound |
WO2023180923A1 (en) * | 2022-03-24 | 2023-09-28 | BI-QEM SPECIALTIES S.p.A. | Leather tanning or retanning compound with cyclodextrin based inclusion compound |
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