Robert C Fulkerson

US Patent:

45686041, Feb 4, 1986

Filed:

Dec 30, 1983

Appl. No.:

6/567188

Inventors:

James M. Kurtz - Cedar Rapids IA
Robert C. Fulkerson - Cedar Rapids IA

Assignee:

J & J Corp., #1 - Cedar Rapids IA

International Classification:

B32B 508

US Classification:

428297

Abstract:

A filler which imparts heat dissipating and shrinkage reduction characteristics to a mixture of the filler with a synthetic resin. The mixture is useful for providing a layer between gel coat and a layer including glass fiber and resin to prevent the formation of small air voids. The filler imparts structural strength to resin so that a useful product may be made from only a layer of gel coat with a layer of the filler and resin. The filler is preferably a mixture of calcium silicate and mica, and in the preferred embodiment the calcium silicate is wollastonite. An improved apparatus for applying the mixture of synthetic resin and filler comprises a modified prior-art spray gun and a mixer which includes a plurality of augers for thoroughly mixing the filler with the resin. The preferred embodiment of the resin comprises a terpolymer mixed with styrene and having a Brookfield thixatropic index of from 2 to 4.