| (19) |
 |
|
(11) |
EP 0 587 411 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
10.04.1996 Bulletin 1996/15 |
| (43) |
Date of publication A2: |
|
16.03.1994 Bulletin 1994/11 |
| (22) |
Date of filing: 07.09.1993 |
|
|
| (84) |
Designated Contracting States: |
|
AT BE CH DE ES FR GB IT LI NL SE |
| (30) |
Priority: |
10.09.1992 US 943089
|
| (71) |
Applicant: APPLETON PAPERS INC. |
|
Appleton
Wisconsin 54912 (US) |
|
| (72) |
Inventors: |
|
- Miller, Robert E.
Appleton,
Wisconsin 54911 (US)
- Brown, Robert W.
Appleton,
Wisconsin 54911 (US)
- Schleicher, Lowell
Appleton,
Wisconsin 54911 (US)
- Feldman, Lucy
Appleton,
Wisconsin 54915 (US)
|
| (74) |
Representative: Norris, Richard John et al |
|
Intellectual Property Department,
Arjo Wiggins Appleton plc,
Butler's Court
Beaconsfield, Buckinghamshire HP9 1RT
Beaconsfield, Buckinghamshire HP9 1RT (GB) |
|
| |
|
| (54) |
Latent image receiving sheet and microcapsules for use therein |
(57) A latent image receiving sheet comprises a substrate bearing microcapsules having
walls of a nonmeltable polymer which is a thermosetting aminoplast resin. The walls
of the microcapsules have an elongation less than 1%, and the image receiving sheet
and microcapsules are resistant to heat. Surprisingly, the latent image receiving
sheet capsules nonetheless rupture upon application to the record material of a
point source energy input or pulse comprising a ΔT of at least 115°C per one millisecond.
The latent image receiving sheet may be an ink transfer sheet or print plate, a gravure
sheet, a cryptic message receiving sheet or an imageable sheet.