Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having voids in a component
Patent
1978-05-03
1979-09-25
Demers, Arthur P.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Composite having voids in a component
260335, 252316, 282 275, 427151, 542401, 546 15, B32B 326
Patent
active
041691830
ABSTRACT:
Disclosed are normally substantially colorless chromogenic 9-dialkylamino-spiro[6H-[1]benzopyrano[3,2-g]quinoline-6,1'(3'H)-isobenzof uran]-3'-one color precursor compounds having the following structural formula: ##STR1## wherein each R.sub.1 represents a lower alkyl group having from one to five carbon atoms and wherein each of R.sub.2 and R.sub.3 represents either a methyl group or a group which includes a methylene bridge resonance path having up to four carbon atoms, but wherein when R.sub.3 is a methylene bridge resonance path-containing group, R.sub.2 is not a methyl group. These compounds are initially substantially colorless but are capable of becoming highly colored when brought into reactive contact with many Lewis acid materials and the like. Accordingly, these compounds are highly useful as a component of pressure-sensitive copying papers.
REFERENCES:
patent: 3988492 (1976-10-01), Spatz
patent: 3996406 (1976-12-01), Alsop
Demers Arthur P.
Moore Business Forms Inc.
LandOfFree
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