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US 4,387,117 AGranted
Record material carrying a color developer composition
AssigneeThe Wiggins Teape Group Limited
InventorKenneth J. Shanton
Life of this patent
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Abstract
A color developer for use in a pressure- or heat-sensitive record material comprises a particulate amorphous hydrated silica/hydrated alumina composite in which the hydrated silica and hydrated alumina are chemically bound and in which the mean alumina content on a dried weight basis is up to 7.5%, based on the total weight of silica and alumina. The composite may be metal-modified, e.g. with copper.
Claims10
A process for the production of record material carrying a particulate amorphous hydrated silica/hydrated alumina composite comprising:
- (a) reacting hydrated silica and hydrated alumina in an aqueous medium thereby yielding an amorphous hydrated silica/hydrated alumina composite having a mean alumina content of from 1.5 to 5.0% based on the total dry weight of silica and alumina;
- (b) applying a coating composition incorporating said composite to a substrate;
- and
- (c) drying the coated substrate to produce record material.
1 more element
Dependencies are inferred from the claim text.