The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 09, 1976
Filed:
Aug. 01, 1974
Marco Wismer, Gibsonia, PA (US);
Karl F Schimmel, Verona, PA (US);
Rodger G Temple, Gibsonia, PA (US);
PPG Industries, Inc., Pittsburgh, PA (US);
Abstract
Solid organic inert flatting agents are prepared by reacting urea or phenol and formaldehyde in a basic aqueous medium to provide a prepolymer solution, then blending the prepolymer in the presence of a protective colloid-forming material, subsequently acidifying the basic prepolymer solution so that particles are formed and precipitated in the presence of a colloid-forming material, as spheroidal beads, and finally collecting and, if desired, drying the urea or phenol formaldehyde particulate beads. These beads have a high flatting efficiency and may be incorporated in resinous vehicles to provide compositions that produce low glass coatings of desirable properties.