| (19) |
 |
|
(11) |
EP 1 506 857 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
30.03.2005 Bulletin 2005/13 |
| (43) |
Date of publication A2: |
|
16.02.2005 Bulletin 2005/07 |
| (22) |
Date of filing: 08.06.1999 |
|
|
| (84) |
Designated Contracting States: |
|
BE DE ES FR GB IT NL SE |
| (30) |
Priority: |
23.06.1998 US 90300 P
29.04.1999 US 301866
|
| (62) |
Application number of the earlier application in accordance with Art. 76 EPC: |
|
99928429.2 / 1011970 |
| (71) |
Applicant: Kodak Polychrome Graphics LLC |
|
Norwalk, Connecticut 06851 (US) |
|
| (72) |
Inventors: |
|
- Shimazu, Ken-Ichi
Briarcliff Manor New York 10704 (US)
- Patel, Jayanti
Woodcliff Lake New Jersey 07695 (US)
- Saraiya, Shashikant
Parlin New Jersey 08857 (US)
- Merchant, Nishith
North Bergon New Jersey 07047 (US)
- Savariar-Hauck, Celin
37534 Badenhausen (DE)
- Timpe, Hans-Joachim
37520 Osterode (DE)
- McCullough, Christopher
Fort Collins Colorado 80526 (US)
|
| (74) |
Representative: Pidgeon, Robert John et al |
|
Appleyard Lees 15 Clare Road
Halifax West Yorkshire HX1 2HY
Halifax West Yorkshire HX1 2HY (GB) |
|
| |
|
| (54) |
Positive-working thermal imaging element and positive-working lithographic printing
plate precursor |
(57) A positive-working thermal imaging element, which can be imaged by thermal energy
is made up of a hydrophilic substrate, and a composite layer structure composed of
two layer coatings. The first layer of the composite is composed of an aqueous developable
polymer mixture containing a photothermal conversion material which is contiguous
to the hydrophilic substrate. The second layer of the composite is composed of one
or more non-aqueous soluble polymers which are soluble or dispersible in a solvent
which does not dissolve the first layer. The second layer may also contain a photothermal
conversion material. The element is exposed with an infrared laser or a thermal print
head. Upon aqueous development of the imaged element unexposed portions are ink-receptive.