Pressure-sensitive recording material

Details Pressure-sensitive recording material Pressure-sensitive recording material

1978-01-09

1979-04-03

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Treatment of hides, skins, feathers and animal tissues

Tanning

8 7, 282 275, 282 28R, 427150, 427151, 427153, D06P 500, B41L 116

Patent

active

041475097

ABSTRACT:
A pressure-sensitive recording material which comprises a substrate bearing a dye-forming component and a binder. The dye-forming component is a spirodipyran of the formula ##STR1## where A is the radical of a fused benzene or naphthalene ring (which rings may or may not be substituted), R.sup.1 is alkyl of 1 to 16 carbon atoms, substituted or unsubstituted phenyl or phenalkyl of 7 to 10 carbon atoms, R.sup.2 is H or together with R.sup.1 is a trimethylene or tetramethylene bridge which is unsubstituted or substituted by from 1 to 3 alkyl, R.sup.3 is benzyl or .beta.-phenylethyl and R.sup.4 is benzyl, .beta.-phenylethyl or substituted or unsubstituted phenyl, or R.sup.3 is alkyl of 1 to 4 carbon atoms and R.sup.4 is substituted or unsubstituted phenyl or R.sup.3 is benzyl and R.sup.4 is .beta.-cyanoethyl. The recording materials give violet to bluish green colorations (copies) only on paper coated with an electron acceptor.

REFERENCES:
patent: 2548366 (1951-04-01), Green et al.
patent: 2800457 (1957-07-01), Green et al.
patent: 3103404 (1963-09-01), Salvin et al.
patent: 4069353 (1978-01-01), Matsukawa et al.

Affiliated with

Also associated with

Rating

Pressure-sensitive recording material does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Pressure-sensitive recording material, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pressure-sensitive recording material will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1744896