Method of patching wood products using a particular polyester blend (US Patent 3,619,228, 1971)

Earland G. Hallonquist and Manfred M. Honnige received US Patent No. 3,619,228 on November 9, 1971, filed July 25, 1966.

The patent's abstract:

An improved plywood patch is obtained by a method of patching plywood comprising the steps of preparing a blend of (A) 45 to 72 weight percent of a mixture containing (1) a polymerizable linear polyester resin comprising reactants of (a) a polyhydric alcohol, (b) an adduct of hexahalocyclopentadiene and an ethylenically unsaturated polycarboxylic compound and (c) a compound selected from the group consisting of maleic anhydride and fumaric acid and (2) an ethylenically unsaturated monomer, (B) 0-10 weight percent of a modifying monomer selected from the group consisting of styrene, vinyl toluene, vinylacetate and Alpha -methyl styrene and (C) 28 to 45 weight percent of an inert material selected from the group consisting of clay, whiting, asbestos, shell flour and wood flour, mixing a catalyst with said blend, applying the catalyzed blend to defects in a plywood surface and curing the blend for at least 10 minutes at a temperature of about 200* to 235* F.

Where it was listed

• Asbestos, March 1972, in its patents department (the year's issues)