US3852374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tanning agents
Assignee: BASF SE
•
Filing: 1972-11-24
•
Granted: 1974-12-03
•
Expires: 1992-11-24
Abstract
Abstract The production of tanning agents based on condensation products of formaldehyde, phenolsulfonic acids, nitrogenous compounds and bisulfite.
Inventors
- 👤 H Erdmann
- 👤 F Miller
- 👤 A Zissel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:57
CPC Classifications
C; C14; C14C; C14C3/00; C14C3/02; C14C3/08; C14C3/18; C14C3/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
123 words
A PROCESS FOR THE PRODUCTION OF TANNING AGENTS BASED ON CONDENSATION PRODUCTS BY REACTION OF A SULFONATED PHENOL DEVOID OF CONDENSED RING SYSTEMS WITH FORMALDEHYDE, UREA, MELAMINE AND/OR DICYANDIAMIDE AND A BISULFITE, WHEREIN A. A CONDENSATION PRODUCT FROM PHENOLSULFONIC ACID, UREA AND FORMALDEHYDE IN A MOLAR RATIO 1:1 TO 15:1.2 TO 2.2 AND B. A METHYLOL COMPOUND OF UREA, MELAMINE AND/OR DICYANDIAMIDE RATIO OF BISULFITE TO NITROGENOUS COMPOUND OF FROM MOLAR RATIO OF BISOF A DEGREE OF SULFITATION WHICH CORRESPONDS 1:0.2 TO 1:1.2 ARE REACTED AT 40*-80*C. AT A PH IN THE RANGE OF 10 TO 13 IN A MOLAR RATIO OF (A) TO (B) OF 1:1 TO 1:9 AND THE PRODUCT IS THEN ADJUSTED TO A PH OF FROM 3 TO 5.
Claim 2
Dependent Claim
123 words
A PROCESS FOR THE PRODUCTION OF TANNING AGENTS BASED ON CONDENSATION PRODUCTS BY REACTION OF A SULFONATED PHENOL DEVOID OF CONDENSED RING SYSTEMS WITH FORMALDEHYDE, UREA, MELAMINE AND/OR DICYANDIAMIDE AND A BISULFITE, WHEREIN A. A CONDENSATION PRODUCT FROM PHENOLSULFONIC ACID, UREA AND FORMALDEHYDE IN A MOLAR RATIO 1:1 TO 15:1.2 TO 2.2 AND B. A METHYLOL COMPOUND OF UREA, MELAMINE AND/OR DICYANDIAMIDE RATIO OF BISULFITE TO NITROGENOUS COMPOUND OF FROM MOLAR RATIO OF BISOF A DEGREE OF SULFITATION WHICH CORRESPONDS 1:0.2 TO 1:1.2 ARE REACTED AT 40*-80*C. AT A PH IN THE RANGE OF 10 TO 13 IN A MOLAR RATIO OF (A) TO (B) OF 1:1 TO 1:9 AND THE PRODUCT IS THEN ADJUSTED TO A PH OF FROM 3 TO 5.
Claim 3
Dependent Claim
29 words
A process as claimed in claim 1 wherein the degree of sulfitataion of (b) corresponds to a molar ratio of bisulfite to nitrogenous compound of from 1:0.66 to 1:1.0.
Claim 4
Dependent Claim
20 words
A process as claimed in claim 1 wherein the molar ratio of phenolsulfonic acid:urea:formaldehyde in component (a) is 1:1: 1.5.
Claim 5
Dependent Claim
18 words
A process as claimed in claim 1 wherein the molar ratio of (a):(b) is from 1:2 to 1:5.
Claim 6
Dependent Claim
25 words
A process as claimed in claim 1 wherein the reaction of (a) with (b) is carried out at a pH of from 10.5 to 11.5.
References Cited (Backward Citations)
GB936560A
Cited
US1841840A
Cited
US2242681A
Cited
US3475113A
Cited
US3637561A
Cited
US3640932A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |