9-Dialkylamino-spiro [6H-[1]benzopyrano[3,2-g]quinoline-6,1'(3'H

Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having voids in a component

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

9-Dialkylamino-spiro [6H-[1]benzopyrano[3,2-g]quinoline-6,1'(3'H does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with 9-Dialkylamino-spiro [6H-[1]benzopyrano[3,2-g]quinoline-6,1'(3'H, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and 9-Dialkylamino-spiro [6H-[1]benzopyrano[3,2-g]quinoline-6,1'(3'H will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1986316

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.