Patents: Correcting ozone - flexible film
Barry Fox says bad typists no longer need to destroy the environment every time they correct their mistakes.
Six researchers working at Gillette in Boston, Massachusetts developed ozone-
Friendly School liquid (PCT 93/21261).
The calibration solution is made of a white polymer in an evaporated solvent, leaving a white flexible film on a typo.
In the past, the solvent used was halogen hydrocarbons, which migrated to the upper atmosphere and destroyed ozone.
Gillette found meth.
Ylcyclohexane, which does not destroy ozone, is also a good solvent.
Isobutin is a membrane-
Form materials, use titanium dioxide as a whitening agent, and match the color of the lamp black with the color of the paper itself.