Process for the manufacture of carboxylated polyethylenimines
AssigneeAgfa-Gevaert
InventorsGeorges Joseph Smets, Jacques Marie Van De Putte
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Abstract
Carboxylated polyethylenimines are prepared by dissolving in an inert solvent a compound of formula: ##STR1## wherein: R represents an alkyl or an aryl group, Each of R', R", and R'" represents hydrogen or methyl, and R.sup.iv represents an alkyl group. The solution is then treated between -30.degree. and 25.degree. C with a polymerization initiator. After hydrolysis the polymer yields a polyamino acid which is an amphoteric product. They may be added as plasticizers to gelatin in photographic layers.
Claims9
Process for the manufacture of carboxylated polyethylenimines, which comprises treating a compound dissolved in an inert solvent with a polymerization initiator selected from the group consisting of Lewis acids and strong proton donors at a temperature between -30.degree. and 25.degree. C, said compound corresponding to the general formula:
- wherein:
- R represents an alkyl group of 1 to 4 carbon atoms of an aryl group,
- each of R', R", R"' represents hydrogen or methyl, and R.sup.IV represents an alkyl group of 1 to 4 carbon atoms.
Carboxylated polyethylenimines composed of recurring units of the general formula:
- ##STR6## wherein:
- R represents an alkyl group of 1 to 4 carbon atoms or an aryl group,
- each of R', R", R"' represents hydrogen or methyl, and R.sup.IV represents an alkyl group of 1 to 4 carbon atoms.
The carboxylated polyethylenimines wherein the recurring units have the formula ##STR7##
The carboxylated polyethylenimines wherein the recurring units have the formula ##STR8##
Dependencies are inferred from the claim text.