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
1981-02-10
1986-03-25
Lilling, Herbert J.
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...
524491, 524505, 525 95, 525 97, C08K 501, C08L 5302
Patent
active
045784205
ABSTRACT:
An eraser composition composed of conventional fillers and additives wherein the binder is a styrene-butadiene-styrene block polymer having a butadiene portion of 10 to 40%. The eraser composition can be easily extruded using simple commercial machines presently available and thus is inexpensive to manufacture. Furthermore, the use of this particular material as a binder produces a superior eraser composition.
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Chem. Abst., vol. 85 (178797h) "Eraser", 1976 Cermak et al.
Derwent Abst. 5126A/03 (J52143121) 11-29-77, "Plastic Erasers . . . ".
Derwent Abst. 48679C/28, 5-26-80, "Vinyl Chloride Resin Comp for Erasers . . . ", Mitsubishi.
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Lilling Herbert J.
Staedtler J. S.
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