EP 0000900 B1 19810114 - SPIROBIPYRANES, THEIR USE AND PRESSURE-SENSITIVE COPYING MATERIALS CONTAINING THEM
Title (en)
SPIROBIPYRANES, THEIR USE AND PRESSURE-SENSITIVE COPYING MATERIALS CONTAINING THEM
Publication
Application
Priority
DE 2737207 A 19770818
Abstract (en)
[origin: US4161589A] Spirodipyrans of the formula <IMAGE> where A is the radical of a fused benzene ring or 2,1-naphthalene ring, the rings being unsubstituted or substituted by alkyl, alkoxy, nitro, chlorine, bromine or carbalkoxy, R1 is alkyl, phenyl, substituted alkyl or phenalkyl and R2 is hydrogen, or R1 and R2 together are trimethylene which is unsubstituted or substituted by 1, 2 or 3 alkyl and B is N-morpholinyl, substituted morpholinyl, thiomorpholinyl-S-dioxide, N-(N'-alkyl)-piperazinyl or N-isoindolinyl, AND PRESSURE-SENSITIVE RECORDING MATERIALS CONTAINING THESE SPIRODIPYRANS AS DYE-FORMING COMPONENTS.
IPC 1-7
IPC 8 full level
C07D 493/06 (2006.01); B41M 5/136 (2006.01); B41M 5/15 (2006.01); C07D 493/10 (2006.01); C09B 57/00 (2006.01)
CPC (source: EP US)
B41M 5/15 (2013.01 - EP US); C07D 493/10 (2013.01 - EP US)
Designated contracting state (EPC)
CH DE FR GB
DOCDB simple family (publication)
EP 0000900 A1 19790307; EP 0000900 B1 19810114; DE 2737207 A1 19790301; DE 2860328 D1 19810312; JP S5441880 A 19790403; US 4161589 A 19790717
DOCDB simple family (application)
EP 78100629 A 19780809; DE 2737207 A 19770818; DE 2860328 T 19780809; JP 10012578 A 19780818; US 93201578 A 19780808