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US 5,290,702 AGranted
Method of detecting and mapping organic solvent-containing materials on a surface
AssigneeValence Technology, Inc.
InventorOn-Kok Chang
Life of this patent
Estimating the term…
Abstract
Chromogenic solvent detectors are used to detect and map the presence of organic solvent-containing materials on a surface. The detector need only be applied to the surface to be tested. When removed, the dark areas on the detector correspond to those areas of the surface where an organic solvent-containing material was present. This method can be used to test the release properties of a release film.
Claims19
A method for detecting and mapping organic solvent-containing materials on a surface using a chromogenic solvent detector which comprises:
- a substrate;
- a binder means which is substantially soluble to said solvent;
- an electron donating chromogenic composition dispersed on said substrate in connection with said binder means;
- and
- an electron accepting composition, which forms a color with said chromogenic composition, dispersed on said substrate in connection with said binder means,
- said method comprising the steps of contacting said surface with said detector, dissolving said binder means of said detector in a region of contact with said organic solvent-containing material, and detecting a visual discoloration of said detector caused by the contact of said organic solvent-containing material with said detector.
3 more elements
Dependencies are inferred from the claim text.