| (19) |
 |
|
(11) |
EP 0 646 651 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
18.09.1996 Bulletin 1996/38 |
| (43) |
Date of publication A2: |
|
05.04.1995 Bulletin 1995/14 |
| (22) |
Date of filing: 19.09.1994 |
|
| (51) |
International Patent Classification (IPC)6: C14C 3/22 |
|
| (84) |
Designated Contracting States: |
|
DE ES GB IT NL |
| (30) |
Priority: |
23.09.1993 US 125876
|
| (71) |
Applicant: ROHM AND HAAS COMPANY |
|
Philadelphia,
Pennsylvania 19106-2399 (US) |
|
| (72) |
Inventors: |
|
- Hodder, James John
Doylestow,
Pennsylvania 18901 (US)
- Shilansky, Byron Harvey
Webster,
New Hampshire 03303 (US)
|
| (74) |
Representative: Smith, Julian Philip Howard et al |
|
Rohm and Haas (UK) Limited,
European Operations Patent Dept.,
Lennig House,
2 Masons Avenue
Croydon CR9 3NB
Croydon CR9 3NB (GB) |
|
| |
|
| (54) |
Method for improving leather treatment |
(57) A method of using a dispersion of a selected amphiphilic copolymer formed from a
predominant amount of at least one hydrophobic monomer and a minor amount of at least
one copolymerizable hydrophilic monomer in the pretanning and tanning step improves
moisture release in the wringing step and improves thickness adjustment in the splitting
and shaving steps of leather treatment is disclosed.