Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1983-03-01
1985-07-02
Pertilla, Theodore E.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524496, 524904, 525501, C08L 6110, C08G 304
Patent
active
045269246
ABSTRACT:
The compositions disclosed herein are suitable for thermosetting and conversion to vitreous carbon. They comprise intimate uniform mixtures of powder or otherwise blendable form of 20-80% by weight of a solid phenolic-aldehyde Novolak resin and of 20-80% by weight of a solid phenolic-aldehyde resol resin, the percentages being based on the combined weight of the Novolak and resol resins, and the aldehyde in said Novolak resin comprising at least 50 molar percent, preferably substantially 100 percent, furfuraldehyde, together with a carbonaceous filler, preferably graphite, in a proportion as high as 76% by weight based on the total composition. Generally the graphite may comprise 30-70%, advantageously 35-65% and preferably 40-60% of the molding composition. The vitreous carbon produced from these compositions have improved properties in electrical properties and in the capability of being suitably molded and carburized into large thin plates which are much more stress-free than otherwise produced. The composition may also contain 0-12 parts, preferably 0.12-8 parts hexamethylenetetramine per 100 parts of Novolak resin. The intimate mixture of these resins is advantageously made by blending resin components having a particle size of less than 40 mesh, preferably less than 100 mesh.
REFERENCES:
patent: 3109712 (1963-11-01), Redfern
patent: 3410718 (1968-11-01), Smith
patent: 3723368 (1973-03-01), Brown et al.
patent: 3969124 (1976-07-01), Stewart
Korb Louis L.
Waitkus Phillip A.
Monacelli Walter J.
Pertilla Theodore E.
Plastics Engineering Company
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