Hardening of photographic protein-containing layers by acrolein polymers containing carboxylic groups
An aqueous protein composition comprises a solution of a protein, preferably gelatine, in water containing in dissolved form an acrolein copolymer, said copolymer being (a) a copolymer of 50 to 95 parts by weight of acrolein and 5 to 50 parts by weigh of a vinyl compound containing in the a -positio...
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Main Authors | , , |
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Format | Patent |
Language | English |
Published |
06.08.1968
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Subjects | |
Online Access | Get full text |
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Summary: | An aqueous protein composition comprises a solution of a protein, preferably gelatine, in water containing in dissolved form an acrolein copolymer, said copolymer being (a) a copolymer of 50 to 95 parts by weight of acrolein and 5 to 50 parts by weigh of a vinyl compound containing in the a -position to the double bond at least one carboxyl group or (b) a copolymer having recurring units of the general formula <FORM:1021007/C3/1> wherein X has a value of 10 and Y is an integer of between 1 and 50. Copolymers (b) are obtained by reaction of strong alkalies with polyacrolein. The copolymers are used in amounts of 0.5 to 4% by weight based on dry gelatine. Copolymers of acrolein with acrylic, methacrylic and maleic acids are exemplified. The compositions may also contain silver halide emulsions. |
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Bibliography: | Application Number: US19640373554 |