Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1981-08-06
1983-04-12
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524286, 524297, 524518, 524553, C08K 510
Patent
active
043798675
ABSTRACT:
A writing medium capable of being erased by merely mechanically rubbing with an ordinary pencil eraser after writing and capable of forming a drawing line possessing high adhering strength onto the surface of paper even immediately after writing on the paper. The writing medium contains a pigment as a colorant, a polynorbornane and/or trans-1,4-polyisoprene, and a mixture solvent solution for dissolving the polynorbornane and the trans-1,4-polyisoprene and containing a low boiling point organic solvent having a boiling point of less than 180.degree. C. and a high vaporization rate and operating as a plasticizer for the polynorbornane and the trans-1,4-polyisoprene and a high boiling point organic solvent having a boiling point of higher than 300.degree. C. and a low vaporization rate. Thus, a drawing line written with the writing medium can be erased merely by rubbing with the eraser within several hours after writing, and is not erased thereafter.
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Lipman Bernard
Schofer Joseph L.
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