Xanthene dyes for ink jet printing

Claim 2

A compound of Formula (1): ##STR8## wherein: X 1 is a sulpho or carboxy group; each X 2 independently is a substituent; m has a value of from 0 to 2; Y 1 and Y 2 are each independently alkyl or halo; and Z is a carboxy group.

Claim 3

A compound according to claim 1 wherein X 1 is a carboxy group.

Claim 4

A compound according to claim 1 or claim 2 wherein Y 1 and Y 2 are each independently C 1-4 -alkyl or halo.

Claim 5

A compound according to claim 1 wherein one or both of the groups represented by Z are at the 3- or 5-position.

Claim 6

A compound according to claim 1 wherein X 2 contains less than 7 carbon atoms.

Claim 7

A compound of Formula (1): ##STR9## wherein: X 1 is a sulpho or carboxy group; each X 2 independently is halo, sulpho, C 1-4 -alkyl, C 1-4 -alkoxy or carboxy; m has a value of from 0 to 2; Y 1 and Y 2 are each independently C 1-4 -alkyl or halo; and Z is a carboxy group.

Claim 8

A compound of Formula (1): ##STR9## wherein: X 1 is a sulpho or carboxy group; each X 2 independently is halo, sulpho, C 1-4 -alkyl, C 1-4 -alkoxy or carboxy; m has a value of from 0 to 2; Y 1 and Y 2 are each independently C 1-4 -alkyl or halo; and Z is a carboxy group.

Claim 9

A compound according to claim 6 wherein the carboxy and sulpho groups are of formula --CO 2 - M + or --SO 3 - M + wherein M + is an alkali metal, substituted ammonium or NH 4 + .

Claim 10

A compound according to claim 6 wherein the carboxy and sulpho groups are of formula --CO 2 - M + or --SO 3 - M + wherein M + is an alkali metal, ammonium or a group selected from the group consisting of (CH 3 ) 3 N + H, (CH 3 ) 2 N + H 2 , H 2 N + (CH 3 )(CH 2 CH 3 ), CH 3 N + H 3 , CH 3 CH 2 N + H 3 , H 2 N + (CH 2 CH 3 ) 2 , CH 3 CH 2 CH 2 N + H 3 , (CH 3 ) 2 CHN + H 3 , isopropylammonium, pyridinium, piperidinium and morpholinium.

Claim 11

A composition comprising a compound according to claim 1 and a second water-soluble magenta compound in relative amounts, by weight, in the range 95:5 to 5:95.

Claim 12

A composition according to claim 9 wherein the second magenta compound is of Formula (5) or salt thereof: Ar.sup.1 N=N--J--W--(NR.sup.1 --L--NR.sup.2 --W).sub.n --J--N=NAr.sup.2( 5) wherein: ##STR10## Ar 1 and Ar 2 are each independently aryl or substituted aryl providing at least one of Ar 1 and Ar 2 has at least one substituent selected from COOH and COSH; each R 1 and R 2 is independently H, alkyl, substituted alkyl, alkenyl or substituted alkenyl; L is a divalent organic linking group; n is 0 or 1; each W independently is carbonyl or a group of the formula (6), (7) or (8): ##STR11## each B independently is NR 3 R 4 , SR 5 or OR 5 ; each D independently is H, Cl, B, SR 6 or OR 6 ; each E independently is Cl or CN; R 3 , R 4 , R 5 and R 6 are each independently H, alkyl, substituted alkyl, alkenyl, substituted alkenyl, aryl, substituted aryl, aralkyl, substituted aralkyl or R 3 and R 4 together with the nitrogen atom to which they are attached form a 5 or 6 membered ring; provided the compound of Formula (5) has at least as many groups selected from --COOH and --COSH as --SO 3 H groups.

Claim 13

An ink comprising a compound according to claim 1 and a liquid medium.

Claim 14

A process for printing a substrate with an ink using an ink jet printer comprising forming the ink into small droplets by ejection from a reservoir through a small orifice so that the droplets of ink are directed at a substrate, wherein said ink is as defined in claim 11.

Claim 15

A paper or an overhead projector slide printed with a compound according to claim 1.

Claim 16

An ink comprising a composition according to claim 10 and a liquid medium.

Claim 17

A paper or an overhead projector slide printed with a composition according to alaim 9.

Claim 18

A paper or an overhead projector slide printed with a composition according to alaim 9.