Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1985-09-23
1988-01-26
Henderson, Christopher
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524505, C09D 1118, C08L 5300
Patent
active
047217391
ABSTRACT:
This discovery relates to an erasable ink composition that can be erased using an ordinary pencil eraser. It can be used in ball point pens. Other applicators can be used.
Of course, the composition includes colorant and solvent. The combination of a thermoplastic elastomer and plasticizer components are important to the composition. The elastomer is a block copolymer, and the plasticizer is advantageously an ester. Other components include lubricant, resin and dispersant. Concentration ranges for the colorant is from 0.1% to 60%, for the thermoplastic elastomer is from 8% to 30%; for the plasticizer is from 10% to 35%; for the solvent is from 10% to 40%; for the resin is up to about 12%; for the lubricant is up to about 8% and for the dispersant is up to about 2%, all percent by weight of the composition. The colorant is conventional; the thermoplastic elastomer and plasticizer are not conventional. The thermoplastic elastomer is styrene-butadiene-styrene; styrene-isoprene-styrene or styrene-polyolefin-styrene. The latter thermoplastic elastomer is advantageous. The advantageous plasticizer is dioctyl adipate. The weight ratio of thermoplastic elastomer to plasticizer is 0.1 to 3.0. Other advantageous components are a polyterpene resin, lauric acid and methyl cyclohexane solvent. The latter component has a Hildebrand solubility range from 6.9 to 7.8 (cal./cm.sup.3).sup.1/2.
This discovery also relates to a process of forming erasable script.
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KRATON Thermoplastic Rubber Crumb, Shell Oil Company (1980).
Arons Irving J.
Brenneman Richard S.
Drennan Paul M.
Pincus Alice H.
Ramzan Chaudhary M.
BIC Corp.
Henderson Christopher
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