Process for the preparation of aqueous dispersions or solutions

Details Process for the preparation of aqueous dispersions or solutions Process for the preparation of aqueous dispersions or solutions

1982-09-17

1984-06-05

Pertilla, Theodore E.

Coating processes

With post-treatment of coating or coating material

Heating or drying

4273884, 524507, 524539, 524591, 524500, B05D 302, C08L 7506

Patent

active

044528345

ABSTRACT:
This invention relates to a new process for the preparation of storage stable aqueous dispersions or solutions of cross-linkable polyurethane polyureas containing heat activated cross-linking agents, in which mixtures of hydrophilically modified prepolymers containing isocyanate groups, hydrophobic polyisocyanates which contain blocked isocyanate groups and are neither soluble nor dispersible in water, and compounds containing at the most one free aminic or hydrazinic primary or secondary amino group and at least one blocked group which under the influence of water forms a free aminic or hydrazinic primary or secondary amino group and a total of at least two such amino groups are prepared in the absence of water and then mixed with water, and it also relates to the aqueous dispersions or solutions obtained by this process and to their use for the production of coatings on heat-resistant substrates.

REFERENCES:
patent: 3388087 (1968-06-01), Dieterich et al.
patent: 3461103 (1969-08-01), Keberle et al.
patent: 3479310 (1969-11-01), Dieterich et al.
patent: 3480592 (1969-11-01), Dieterich et al.
patent: 3686108 (1972-08-01), Rieff et al.
patent: 3756992 (1973-09-01), Dieterich et al.
patent: 4046729 (1977-09-01), Scriven et al.
patent: 4098933 (1978-07-01), Burkhardt et al.
patent: 4192937 (1980-03-01), Noll et al.
patent: 4269748 (1981-05-01), Nachtkamp et al.
patent: 4284544 (1981-08-01), Wegner et al.
D. Dieterich et al., Angew. Chemie, 82, 53, (1970).

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