| (19) |
 |
|
(11) |
EP 1 120 280 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
05.09.2001 Bulletin 2001/36 |
| (43) |
Date of publication A2: |
|
01.08.2001 Bulletin 2001/31 |
| (22) |
Date of filing: 16.01.2001 |
|
| (51) |
International Patent Classification (IPC)7: B41M 5/00 |
|
| (84) |
Designated Contracting States: |
|
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
Designated Extension States: |
|
AL LT LV MK RO SI |
| (30) |
Priority: |
27.01.2000 US 491642
10.04.2000 US 545934
|
| (71) |
Applicant: Hewlett-Packard Company, A Delaware Corporation |
|
Palo Alto, CA 94304 (US) |
|
| (72) |
Inventor: |
|
- Tsao, Yi-Hua
San Diego, CA 92127 (US)
|
| (74) |
Representative: Jackson, Richard Eric |
|
Carpmaels & Ransford, 43 Bloomsbury Square
London WC1A 2RA
London WC1A 2RA (GB) |
|
| |
|
| (54) |
Method for increasing dot size on porous media printed with pigmented inks |
(57) It is found that by wetting coated media, such as film-based media (e.g., Mylar film)
and resin-coated papers (e.g., photobase paper), with a dilute polymer solution or
colloidal silica or colloidal alumina dispersion with small particle size, the dot
size increases compared to the current default dot size when printed with pigment-based
inks in a Hewlett-Packard CP-2500 or CP-3500 printer. No previous efforts are known
to increase the dot size on coated porous media printed with pigment inks.