Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1990-06-19
1991-10-08
Lieberman, Allan M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524 88, 524190, 524322, 524400, 524427, 524431, 524432, 524445, 524451, 524487, 524489, C09L 2306, C08L 2306, C08L 9106, C08L 509
Patent
active
050554980
ABSTRACT:
The solid marking composition of the invention includes from about 15% up to about 50% by weight of a polyethylene resin component having a specific gravity in the range of from about 0.95 up to about 0.96. In addition, the composition of the invention includes from about 20% up to about 55% by weight of a compatible plasticizer, and from about 3% up to about 20% by weight active material of a pigment. Optionally, the composition may include a pigment dispersing agent, such as a fatty acid. Further additives which may advantageously employed include extenders or fillers, oxidation stabilizers, UV stabilizers, and mold release agents. The composition of the invention is fabricated into marking instruments having unexpectedly improved eraseability, ease of application, barrel breaking strength, and tip breaking strength, while eliminating bloom entirely.
REFERENCES:
patent: 3409574 (1968-11-01), Gros
patent: 3933788 (1976-01-01), Brinkman
patent: 4768987 (1988-09-01), Usui et al.
Brandrup et al., "Polymer Handbook," Second Edition, John Wiley & Sons, p. v-21, 1975.
Binney & Smith Inc.
Lieberman Allan M.
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