Compositions, processes, and writing elements employing resins o

Details Compositions, processes, and writing elements employing resins o Compositions, processes, and writing elements employing resins o

1981-04-24

1983-02-01

Griffin, Ronald W.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

106 19, 106 27, 524496, 524594, C08K 304, C09D 1300

Patent

active

043716326

ABSTRACT:
A "cold-processed" thermoset plastic pencil lead is produced by extruding a composition formed by blending a mixture of a marking material, a phenolic novolac resin, a hardening agent, a plasticizer, and a lubricant. Blending, billeting, and extruding operations are performed at material temperatures that, in general, do not exceed about 200.degree. F. The extrudate is cured at higher temperatures of, for example, 260.degree. F. to 325.degree. F.

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