Thermoreactive recording material having particular stability
AssigneeBayer Aktiengesellschaft
InventorsGunter Klug, Heinrich Schrage, Pieter Ooms, Hans-Josef Buysch
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Abstract
New thermoreactive recording materials contain at least one salt of a specially modified bisphenolcarboxylic acid and are distinguished by good stabilisation of the ink, even upon extended storage time, good light stabilities and excellent stabilities to water, plasticisers, fats and substances contained in text-marking pens.
Claims10
A thermoreactive recording material comprising a support coated with a coating comprising a chromogen, a color developer and at least one salt of a modified bisphenol carboxylic acid of the formula (I) ##STR4## in which R.sub.1 in each case represents, independently of one another, C.sub.1 -to C.sub.5 -alkoxy, C.sub.6 -alkyl, C.sub.3 - to C.sub.6 -cycloalkyl or phenyl,
- R.sub.2 represents hydrogen, C.sub.1 - to C.sub.6 -alkyl or phenyl,
- R.sub.3 represents C.sub.1 - to C.sub.5 -alkylene,
- m in each case represents, independently of one another, one or two,
- n in each case represents, independently of one another, zero, one or two and
- M represents an equivalent of a polyvalent metal ion.
Dependencies are inferred from the claim text.