ROBERT K BROWN, M.D.
Medical Practice at Park Club Ln, Buffalo, NY

4387181, Jun 7, 1983

Apr 9, 1980

6/138750

Robert A. Brown - Williamsville NY
Jesus L. Caamano - Amherst NY
Henry A. Kasprzak - Luchawanna NY

Textron, Inc. - Providence RI

C08J 302, C08L 7502, C08L 7504

524714

There are disclosed aqueous dispersions of salts, e. g. , tertiary amine salts, of polyamine-extended, aromatic polyisocyanate-based prepolymers having carboxylic groups, especially such dispersions made from prepolymers of polyisocyanates in which the isocyanate groups are on different aromatic rings. These products, as well as, aqueous dispersions of salts of prepolymers of aromatic polyisocyanates can be made from blocked, aromatic polyisocyanate-based prepolymers, particularly oxime-blocked prepolymers. The polymer salts can have sufficient neutralized, carboxylic groups to provide stable, aqueous dispersions, and the dispersions of the polyamine-extended polymers have infinite dilutability with water and excellent resistance to gelling upon freezing and thawing. Carboxylic groups can be supplied to the prepolymers by reactants having two or more groups containing isocyanate-reactive hydrogen atoms employed in making the aromatic isocyanate prepolymers, particularly dihydroxy alkanoic acids. The polymer salts may be stably dispersed in the aqueous medium, even in the absence of substantial amounts of cosolvents, and the aqueous dispersions of the extended prepolymers are useful as, for instance, coatings for solid substrates to provide water resistance.

4034168, Jul 5, 1977

Dec 2, 1974

5/528777

Robert Kenneth Brown - Buffalo NY

B60L 904

191 2

A device to detect and control electrical potential polarities between two or more adjacent insulated conductor sections is disclosed. An amplifying circuit monitors the relative state of the polarities of the adjacent conductor sections and actuates a relay to change the same if a difference is sensed. The sensing function of the amplifying circuit is controlled by a switch member.