Liquid photopolymer useful in fabricating printing plates...

Details Liquid photopolymer useful in fabricating printing plates... Liquid photopolymer useful in fabricating printing plates...

1996-09-24

2003-04-29

Hamilton, Cynthia (Department: 1752)

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Making printing plates

C430S300000, C430S284100

Reexamination Certificate

active

06555292

ABSTRACT:

SUMMARY OF INVENTION
These and other objects are achievable with a photopolymer composition comprising:
A. An ethyleneically unsaturated polyurethane prepolymer having the structure:
Y−X&Parenopenst;P−X&Parenclosest;
n
Y
 Wherein P is selected from the group consisting of hydrogenated polybutadiene, hydrogenated polyisoprene and copolymers of hydrogenated butadiene with styrene (note that the starting raw reactants for P is a hydroxyl terminated compound selected from the previously noted group);
Wherein X is selected from the group consisting of aromatic diisocyanates and aliphatic diisocyanates;
Wherein Y is a terminal group which has an ethyleneically active portion at the outer end of the group; and
Wherein n is an integer from 1 to 20;
B. at least one ethylenically unsaturated monomer; and
C. at least one photoinitiator.


REFERENCES:
patent: 3764324 (1973-10-01), Reyes
patent: 3960572 (1976-06-01), Ibata et al.
patent: 4198238 (1980-04-01), Scheve
patent: 4423135 (1983-12-01), Chen et al.
patent: 4925775 (1990-05-01), Hoffmann
patent: 470834 (1992-02-01), None
patent: 5-216225 (1993-08-01), None
Van Norstrand Reinhold “Hawley's Condensed Chemical Dictionary” pp. 932-935, STIC, PTO Mar. 28, 1991.*
Robert Thornton Morrison, Robert Neilson Boyd (NY Univ.) Third Ed. Allyn and Bacon, Inc. Boston p. 1048 Chap 32.

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