Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1980-07-14
1983-08-09
Silverberg, Sam
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
164526, 164527, 427221, 428404, B22C 122
Patent
active
043979670
ABSTRACT:
A fast curing shell molding composition having the tensile strength of a conventional novolac resin when cured contains a fast curing novolac resin comprising a methylene chained polyphenylol wherein a major portion of the methylene linkages are coupled to adjacent phenylol groups of the o-o' and p-p' position, wherein at least about 19% of the methylene linkages are coupled to adjacent phenylol groups at the o-o' portions, and wherein at least about 3% of the total number of methylene linkages are coupled to adjacent phenylol groups at the p-p' positions. The shell molding composition is produced from the fast curing novolac resin by uniformly coating refractory granules with the fast curing resin. The fast curing novolac resin can be prepared by blending a conventional novolac resin with a novolac resin having a large proportion of methylene linkages coupled to adjacent phenylol groups at the o-o' position. The fast curing novolac resin can also be prepared by a novel two step condensation reaction of phenol and formaldehyde.
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Georgia-Pacific Corporation
Silverberg Sam
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