High solid coatings containing titanates and silanes

#1. Field of the Invention

#This invention relates to pigmented high solid coatings containing viscosity reducing amounts of a hydrolyzable silane and a titanate ester.

#2. Description of the Prior Art

#Organic film-forming vehicles which are useful in high solid coatings and which have active hydrogen or epoxy functionality are well known in the art and are typically used for many industrial coating applications. Active hydrogen functionality means those reactive groups as determined by the Zerewitinoff Method as described by Kohler in J. Am. Chem. Soc., 49, 3181 (1927). Repsentative reactive groups include --OH, --COOH, --SH, --NH, etc. The organic film-forming vehicles typically will have weight average molecular weights between about 200 and about 10,000. Typically the molecular weight will be between about 500 and about 6,000.

#The film-forming vehicles can be prepared by a number of methods well known in the art. Hydroxy or acid functional alkyd or polyester vehicles are well known in the art and can be prepared in a known matter by the condensation of polyhydric alcohols and polycarboxylic acids or anhydrides, with or without the inclusion of natural drying oil fatty acids. By adjusting the stoichiometry of the alcohols and the acids, polymers can be readily produced having an excess of either acid or alcohol functionality. A representative high solid polyester vehicle is taught in U.S. Pat. No. 4,169,825.

#Polyepoxide polymers are also well known in the art. The polyepoxides may be saturated or unsaturated, aliphatic, cycloaliphatic, aromatic or heterocyclic. Examples of suitable polyepoxides include the generally known polyglycidyl ethers of polyphenols such as those prepared by the etherification of a polyphenol with epichlorohydrin or dichlorohydrin in the presence of an alkali. Additionally, polyepoxides can be prepared as acrylic resins by the polymerization of unsaturated monomers having epoxy functionality.