Potters Industries Inc.

Alfred E Fuchs

Robert Dejaiffe

Jeffrey P Shawcross

John J Giordano

Retroreflective materials are made by coating glass particles with both hydrophobic polymers and coupling agents or with siloxane compounds which have both hydrophobic side chains and coupling-type side chains capable of chemically bonding to, or of forming loose associations with, a wide variety of materials.

Retroreflective materials and methods for their production and use

Organosilicon quaternary ammonias and other microbicidal compounds are bound to the surface of discrete inorganic particles such as glass spheres. Inorganic particles coated with the microbicidal compounds are used in hospital fluidized beds, air filters, and other products in which microbicidal qualities are desired.

Microbicidal coated beads

A method of analyzing molecular layers of amino-functional group coupling agents on inorganic substrates is disclosed. A saturated solution of 1-dimethylaminonaphthalene-5-sulfonyl chloride is added to a sample to be tested, and sufficient time is allowed, with or without heating, for the reaction of the 1-dimethylaminonaphthalene-5-sulfonyl chloride with any amino functional group coupling agent which might be present. The color intensity of the reaction product is compared under ultraviolet light in an otherwise substantially dark room with the color intensity of standards representative of known thicknesses of coupling agent to determine the existence and thickness of the coupling agent on the particles being analyzed. If the reaction is allowed to progress without heating, rinsing will wash away some of the coating that is not sufficiently chemically bound to the substrate, and thus will decrease the amount of reaction product - of which the coating is a substituent - that can be observed on the substrate. The reduced reaction product is manifested by a reduced color intensity of the sample when viewed under ultraviolet light in a dark room. The occurrence of this reduced color intensity, relative to a part of the same sample reacted with heating, indicates insufficient chemical bonding of the coating to the substrate.

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Denville, NJ, United States of America

Alfred E Fuchs