Chemistry: natural resins or derivatives; peptides or proteins; – Proteins – i.e. – more than 100 amino acid residues – Chemical modification or the reaction product thereof – e.g.,...
Patent
1995-08-30
1996-07-16
Schilling, Richard L.
Chemistry: natural resins or derivatives; peptides or proteins;
Proteins, i.e., more than 100 amino acid residues
Chemical modification or the reaction product thereof, e.g.,...
430204, 430230, 530409, 530354, G03C 1047, G03F 707
Patent
active
055368174
ABSTRACT:
A modified gelatin is disclosed wherein part of the free carboxyl groups is replaced by modifiers having more acid end-standing groups chosen from --SO.sub.3 M, --OSO.sub.3 M, --SSO.sub.3 M, ---OPO(OH).sub.2, --OPO(OH)(OR.sup.2), --PO(OH).sub.2, --PO(OH)(OR.sup.2).
In a preferred embodiment such a modified gelatin is incorporated in a DTR photographic material which after processing can serve as a lithographic printing plate. Thanks to the more hydrophilic character of the modified gelatin the differentiation between printing and non-printing areas is improved and toning at printing start-up is reduced.
REFERENCES:
patent: 3539353 (1970-11-01), Gates et al.
patent: 4021245 (1977-05-01), Nagatomo et al.
patent: 5219992 (1993-06-01), Specht et al.
patent: 5391477 (1995-02-01), Weatherill
Kok Piet
Loccufier Johan
Michiels Eddy
Michiels Frank
Rompuy Ludo Van
Agfa-Gevaert N.V.
Schilling Richard L.
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