Aqueous dispersions based on a polyurethane synthetic resin

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...

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Details

524591, C08L 9302, C08L 7512

Patent

active

044966750

ABSTRACT:
The invention relates to aqueous dispersions based on a polyurethane synthetic resin which has been obtained by reacting a hydroxyl-containing unsaturated polyester with a diisocyanate and reacting the product with a dihydroxycarboxylic acid, dihydroxysulfonic acid, diaminocarboxylic acid or diaminosulfonic acid, neutralizing the intermediate product with a tertiary amine and transferring it into an aqueous phase, and then reacting the terminal isocyanate groups with a primary and/or secondary diamine, as a chain-lengthening agent. The dispersions contain hydrolyzed shellac as second binder component. They produce coatings having excellent solvent resistance and excellent adhesion, even to difficult substrates.

REFERENCES:
patent: 3539483 (1970-11-01), Keberle
patent: 4066591 (1978-01-01), Scriven
patent: 4108814 (1978-08-01), Reiff
patent: 4203883 (1980-05-01), Hangauer
patent: 4240939 (1980-12-01), Kostic
patent: 4306998 (1981-12-01), Wenzel
patent: 4408008 (1983-10-01), Markusch

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