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Primary Examiner: Griffin, Ronald W.
Assistant Examiner:
Attorney: Troy; Frank J.

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Title: Organic flatting agents and method of preparation

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.

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Inventors: Wismer, Marco (Gibsonia, PA, US)
Schimmel, Karl F. (Verona, PA, US)
Temple, Rodger G. (Gibsonia, PA, US)

Application Number: 493818
Filing Date: 1974-08-01
Publication_date: 1976-03-09
Assignee: PPG Industries, Inc. (Pittsburgh, PA)
Primary Class(es): 523/223 524/44, 525/142, 525/143, 525/145, 525/429, 525/441, 525/442, 525/501, 528/74.5
Other Classes:
US Patent Ref:

3615792	Oct, 1971	Keene	260/14.
3627713	Dec, 1971	Maruta et al.	260/15.
3634347	Jan, 1972	Kao	260/15.
3703487	Nov, 1972	Green et al.	260/2.
3761433	Sep, 1973	High	260/22.
3830782	Aug, 1974	Kempter et al.	260/67.

Other Refs: 855,768

Nov, 1970	CA

Other References: Chatfield, Varnish Constituents, London, Leonard Hill Limited, 1953, pp. 345-353.
Singer, Fundamentals of Paint, Varnish, and Lacquer Technology, St. Louis, Mo., American Paint Journal Company, 1957, pp. 35-44.