Process for forming novolak resin compositions into molding gran

Details Process for forming novolak resin compositions into molding gran Process for forming novolak resin compositions into molding gran

1977-08-01

1980-03-04

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

With printing or coating of workpiece

264151, 264175, 264282, B29C 1700

Patent

active

041917235

ABSTRACT:
Novolak phenolic resin compositions are formed into molding granules by homogenizing the composition above the melting point of the resin, calendering the homogenized composition with conversion into a coherent sheet, rolling the sheet between a pair of rollers, at least one of which is indented, to produce a coherent embossed sheet, fracturating the embossed sheet with separation of the granules having substantially the shape and size of the embossments, coating the granules with a phenolic compound and heat-treating the coated granules by flowing a stream of inert gas having a temperature not exceeding 130.degree. C.
The resulting granules are free-flowing, free from a tendency to release dust and particularly suitable for injection molding.

REFERENCES:
patent: 2516295 (1950-07-01), Borton et al.
patent: 2624514 (1953-01-01), Wilhousky
patent: 2755509 (1956-07-01), Smidth
patent: 3114930 (1963-12-01), Oldham et al.
patent: 3988401 (1976-10-01), Kasting et al.

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