| (19) |
 |
|
(11) |
EP 0 757 108 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
18.03.1998 Bulletin 1998/12 |
| (43) |
Date of publication A2: |
|
05.02.1997 Bulletin 1997/06 |
| (22) |
Date of filing: 26.07.1996 |
|
| (51) |
International Patent Classification (IPC)6: C14C 9/00 |
|
| (84) |
Designated Contracting States: |
|
DE ES GB IT NL |
| (30) |
Priority: |
03.08.1995 US 1832
|
| (71) |
Applicant: ROHM AND HAAS COMPANY |
|
Philadelphia,
Pennsylvania 19106-2399 (US) |
|
| (72) |
Inventors: |
|
- El A'mma, Anton Georges
Perkiomenville,
Pennsylvania 18074 (US)
- Whiteman, John David
Churchville,
Pennsylvania 18966 (US)
|
| (74) |
Representative: Angell, David Whilton et al |
|
ROHM AND HAAS
European Operations Patent Department
Lennig House
2 Mason's Avenue
Croydon
CR9 3NB
Croydon
CR9 3NB (GB) |
|
| |
|
| (54) |
Method for waterproofing leather |
(57) The present invention provides an aqueous composition for use in waterproofing leather
containing an aqueous dispersion of a silicone oil emulsified with a water-insoluble
amphiphilic copolymer formed from 50 weight percent to 90 weight percent of at least
one ethylenically-unsaturated hydrophobic monomer and from 10 weight percent to 50
weight percent of at least one copolymerizable water-soluble ethylenically-unsaturated
acidic or basic hydrophilic comonomer; where the copolymer has a weight average molecular
weight of from 2000 to 100,000; and where the ratio of silicone oil to amphiphilic
copolymer by weight is from 1:5 to 8:1. A method for waterproofing leather using the
aqueous composition is also provided.