US9005884
US9005884
US9005884
5884B2
1A 2A 3A 4A SA 6A, 7A 1A 2A 3A 4A
image mask
dispersibility
In the Table, the developer composition (parts by weight) shows parts by weight of all components,
TABLE 2
example comparative example
8A 9A 10A 11A 12A 13A 14A 5A 6A 7A 8A
Examples 1B to 12B, Comparative Examples 1B to pared. Amount of the resin washed out by the developing was
4B 0.08 kg per one sheet of the original plate. Whenever 28
sheets of the original plate were developed, 100 mL of a
40 developer was sampled to a beaker and its pH was measured
Cosmolite NS170F (manufactured by Toyobo) was used as using a pH meter of handy type (SK-620PH manufactured by
a flexographic printing original plate of a negative system. A Sato Keiryoki Seisakusho). After that, a brush was lifted up
developer was prepared by the following method (1) and its and the degree of clogging by the Scum was confirmed by
developing property (pH and Scum dispersibility) was evalu naked eye. The cases where clogging by the Scum was not
ated by the following method (2). Developer compositions of 45 noted and was noted in the brush were marked 'o' and ''x'',
Examples 1B to 12B and Comparative Examples 1B to 4B respectively. When the brush was not clogged, a good printing
and evaluated results thereof are shown in Table 3 and Table plate could be prepared without problem. No deterioration of
4. the quality on the printing plate surface by adhesion of the
50
scum was noted. On the other hand, when the brush was
(1) Preparation of Developer clogged, deterioration of the quality on the printing plate
Each of the developer compositions of Examples 1B to Surface by adhesion of the Scum was noted. The stage when
12B and Comparative Examples 1B to 4B shown in the fol the brush clogging was noted was regarded as the limit of the
lowing Table 3 and Table 4 was diluted with tap water to an use of the developer and the experiment was finished.
extent of 1% by weight to prepare a developer. A developer 55 When a developer prepared from each of the developer
(45 kg) was poured into a developing device (Stuck System) compositions of Examples 1B to 12B was used, no deterio
manufactured by A&V and the temperature was raised up to ration of the quality on the printing plate Surface by adhesion
40° C. of the scum was noted even if the ratio by weight of the
60
developed non-crosslinked resin to 100 parts by weight of the
(2) Evaluation of Developing Property developer rose to 10 parts by weight or more. On the other
An original plate of 381 mmx305 mm (0.116 m) was hand, when a developer prepared from each of the developer
irradiated with chemical ray (light source: Philips 10R; illu compositions of Comparative Examples 1B to 4B was used,
minance at 365 nm.8 mW/cm) for 15 seconds from the side much clogging was noted in a brush if the ratio by weight of
of the support. After that, a protective film was peeled and 65 the non-crosslinked resin was more than 5 parts by weight
developed for 7 minutes. A printing plate where the non whereby the deterioration of the quality of the printing plate
image area was 100% and the depth was 700 um was pre Surface by adhesion of the Scum was significant.
US 9,005,884 B2
15 16
TABLE 3
comparative
example example
1B 2B 3B 4B 5B 6B 1B 2B
*ratio by weight of the non-crosslinked resin: ratio by weight of the non-crosslinked resin to 100 parts by weight of the developer
In the Table, the developer composition (parts by weight) shows parts by weight of all components,
TABLE 4
comparative
example example
7B 8B 9B 1OB 11B 12B 3B 4B
*ratio by weight of the non-crosslinked resin: ratio by weight of the non-crosslinked resin to 100 parts by weight of the developer
In the Table, the developer composition (parts by weight) shows parts by weight of all components,