| (19) |
 |
|
(11) |
EP 1 452 242 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
18.01.2006 Bulletin 2006/03 |
| (43) |
Date of publication A2: |
|
01.09.2004 Bulletin 2004/36 |
| (22) |
Date of filing: 03.09.1998 |
|
| (51) |
International Patent Classification (IPC):
|
|
| (84) |
Designated Contracting States: |
|
BE DE ES FR GB IT |
| (30) |
Priority: |
08.09.1997 US 58148 P
01.09.1998 US 144766
|
| (62) |
Application number of the earlier application in accordance with Art. 76 EPC: |
|
98948081.9 / 1017507 |
| (71) |
Applicant: E.I. DU PONT DE NEMOURS AND COMPANY |
|
Wilmington, DE 19898 (US) |
|
| (72) |
Inventors: |
|
- Batzar, Kenneth
Cherry Hill
New Jersey 08003 (US)
- Hamilton, Jeffrey Hugh
Greenville
Delaware 19807 (US)
- Rey, Christopher Mark
Hockessin
Delaware 19707 (US)
- Leck, Thomas J
Hockessin
Delaware 19707 (US)
- Herzer, Alan Charles
Turnersville
New Jersey 08102 (US)
|
| (74) |
Representative: Matthews, Derek Peter |
|
Frank B. Dehn & Co.,
179 Queen Victoria Street
London EC4V 4EL
London EC4V 4EL (GB) |
|
| |
|
| (54) |
Patterned release finish |
(57) Smooth, patterned substrates useful in producing decorative cookware are formed by
coating a base with a mixture of fluoropolymer and magnetic flakes and magnetically
inducing an image in the polymer coating composition. The baked fluoropolymer release
coating contains magnetizable flakes, a portion of the flakes being oriented in the
plane of the substrate and a portions of said flakes being magnetically reoriented
to form a pattern in the coating which is observed in reflected light, the flakes
having a longest dimension which is greater than the thickness of said coating. The
patterned substrate is formed by applying magnetic force through the edges of a magnetizable
die positioned under a coated base to induce an imaging effect or pattern. The coating
composition in then cured resulting in a smooth surface, patterned nonstick finish
on the substrate.