Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D11/00—Inks
  • C09D11/30—Inkjet printing inks
  • C09D11/32—Inkjet printing inks characterised by colouring agents
  • C09D11/328—Inkjet printing inks characterised by colouring agents characterised by dyes
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
  • C09B43/00—Preparation of azo dyes from other azo compounds
  • C09B43/12—Preparation of azo dyes from other azo compounds by acylation of amino groups
  • C09B43/136—Preparation of azo dyes from other azo compounds by acylation of amino groups with polyfunctional acylating agents
  • C09B43/16—Preparation of azo dyes from other azo compounds by acylation of amino groups with polyfunctional acylating agents linking amino-azo or cyanuric acid residues

Definitions

• This invention relates to dyes, to inks and to their use in ink jet printing ("UP").
• UP is a non-impact printing technique in which droplets of ink are ejected through a fine nozzle onto a substrate without bringing the nozzle into contact with the substrate.
• the inks are often required to dry quickly when applied to a substrate to prevent smudging, but they should not form a crust over the tip of an ink jet nozzle because this will stop the printer from working.
• the inks should also be stable to storage over time without decomposing or forming a precipitate which could block the fine nozzle.
• A is N, C-CI, C-CN or C-NO 2 ;
• R 1 is H or optionally substituted alkyl
• G is sulpho, carboxy, optionally substituted alkyl, optionally substituted alkoxy, -CF 3 or -PO 3 H 2 ;
• L 1 and L 2 are each independently -SR 2 , -OR 3 or -NR 4 R 5 ;
• R 2 , R 3 , R 4 and R 5 are each independently H, or alkyl or aryl each of which is optionally substituted by a group other than sulphato or vinyl sulphone; or
• R 4 and R 5 together with the nitrogen to which they are attached form an optionally substituted five or six membered ring; provided that:
• L and L 2 are free from carboxy, sulpho and -PO 3 H 2 groups; (b) L 1 and L 2 are not both -NH 2 ; and
• L 1 and L 2 are not both hydroxyethylamino.
• A is N.
• R 1 is preferably H or optionally substituted C ⁇ -alkyl, more preferably H or Cj- 4 - alkyl optionally substituted by hydroxy, carboxy, sulpho or cyano. Examples include methyl, ethyl, n-propyl, iso-propyl, hydroxyethyl, cyanoethyl, sulphopropyl and carboxyethyl. It is especially preferred that R 1 is H.
• G is preferably attached ortho to the azo group.
• G is -SO 3 H, -COOH, -CF 3 , alkyl (preferably optionally substituted C,_ 4 -alkyl), alkoxy (preferably optionally substituted C ⁇ -alkoxy) or -PO 3 H 2 , more preferably -SO 3 H, -COOH or -CF 3 and especially -SO 3 H.
• Preferred optional substituents on G are selected from -OH, -COOH and -NH 2 .
• R 2 , R 3 , R 4 or R 5 is optionally substituted alkyl it is preferably optionally substituted C ⁇ -alky!.
• the alkyl group my be straight-chain or branched-chain. When it is a branched-chain alkyl, it is preferably an ⁇ -branched alkyl group, for example -CH(CH 3 )CH 2 CH 2 CH 3 or -CH(CH 3 )CH 2 CH(CH 3 ) 2 .
• the alkyl group is optionally substituted C ⁇ o-alkyl, more preferably optionally substituted C,_ 6 -alkyl and especially optionally substituted C ⁇ -alkyl.
• the alkyl group is optionally substituted C 5 . 20 -alkyl, more preferably C 9 - 2 o-alkyl.
• Preferred optional substituents on the alkyl groups represented by any of R 2 , R 3 , R 4 or R 5 include hydroxy, cyano, halo (especially F or Cl), nitro, Cj-e-alkoxy, Cj-e-hydroxyalkoxy, a 5 or 6 membered heterocyclic group, a group represented by T, wherein T is an optionally substituted amino group and phenyl optionally substituted by one or more of C.,- 10 -alkyl, hydroxy, cyano, halo, nitro, Cj-e-alkoxy, C ⁇ -hydroxyalkoxy or a group T.
• Especially preferred substituents on the alkyl group(s) are selected from hydroxy, a 5 or 6 membered heterocyclic group and a group represented by T.
• Preferred 5 or 6 membered heterocyclic groups are optionally substituted furanyl and tetrahydrofuranyl, more preferably furanyl or tetrahydrofuranyl and especially furan-2-yl and tetrahydrofuran-2-yl.
• T is a group of the formula -NR 6 R 7 wherein R 6 and R 7 are each independently H, optionally substituted alkyl, -CO(alkyl), -CO(phenyl), or R 6 and R 7 together with the nitrogen to which they are attached form an optionally substituted morpholinyl, piperazinyl or piperidinyl ring.
• R 6 or R 7 is optionally substituted alkyl it is preferably optionally substituted C 1 . 20 -alkyl, more preferably optionally substituted C 1-6 -alkyl, and especially Cj- 4 -alkyl, for example methyl, ethyl, n-propyl and iso-propyl.
• Preferred optional substituents on R 6 and R 7 are selected from -OH and -NH 2 .
• R 6 or R 7 is -CO(alkyl) it is preferably -CO(C 1 . 6 -alkyl), more preferably -COCC ⁇ -alkyl).
• R 6 or R 7 is -CO(alkyl) it is preferably -CO(C 1 . 6 -alkyl), more preferably -COCC ⁇ -alkyl).
• -COCH 2 CH 3 and -COCH 2 CH 2 CH 3 preferably -COCH 2 CH 2 CH 3 .
• R 6 and R 7 together with the nitrogen to which they are attached form a substituted morpholinyl, piperidinyl or piperazinyl ring it is preferably substituted by C ⁇ -alkyl, C 1 - 4 -hydroxyalkyl, -COCC ⁇ -alkyl) or a group of the formula -M-NR 8 R 9 wherein M is an alkylene linking group and R 8 and R 9 each independently is H or C ⁇ -alkyl optionally substituted by hydroxy or C ⁇ -alkoxy.
• M is preferably C,_ 6 -alkylene, more preferably C 2 . 6 -alkylene and especially -(CH 2 ) g -, where g is from 2 to 6.
• T include -NH 2 ; -NHCC j - j o-alkyl) (preferably -NH ⁇ e-alky!) , for example ethylamino, -NHCH(CH 3 )CH 2 CH 3 and -NHC 16 H 33 ; -N(C 1 .
• 6 -alkyl) 2 for example di-ethylamino; -NHCOCC ⁇ -alkyl), for example -NHCOCH 3 and -NHCOCH 2 CH 3 ; -NH(Phenyl); morpholinyl optionally substituted by one or more C j - 4 -alkyl groups, for example morpholinyl, 2,6-dimethylmorpholinyl and 2-methylmorpholinyl; piperazinyl; and substituted piperazinyl groups of the Formula (2):
• Y is C 1 . 4 -alkyl, hydroxy-C 1 . 4 -alkyl, -COCC ⁇ -alkyl) or a group of the formula
• R 8 and R 9 are as hereinbefore defined.
• Preferred groups of the Formula (2) include for example:
• a preferred alkyl group substituted by T which may be represented by any of R 2 , R 3 , R and R 5 is of the formula -(C d H 2d )-T wherein d is 1 to 6, more preferably 2 to 6 and T is as hereinbefore defined.
• a further preferred optionally substituted alkyl group represented by any of R 2 , R 3 , R 4 and R 5 is of the Formula (3):
• R 10 is H or alkyl optionally substituted by -NH 2 or ; a and b are different and from 1 to 6; p is from 1 to 4; and q is from 0 to 3.
• R 10 is H or C 1 - 4 -alkyl, more preferably H.
• a and b are each independently 2 to 6, more preferably 2 or 3, p is 1 or
• Preferred groups of Formula (3) include -(C 2 - 6 -alkylene)O(C 2 . 6 -alkylene)OC 1 - 4 alkyl, for example -C 2 H 4 OC 2 H 4 OCH 3 , and -(C 2 - 6 -alkylene)0(C 2 . 6 -alkylene)OH, for example -C 2 H 4 OC 2 H 4 OH, -CH 2 CH(CH 3 )CH 2 OC 2 H 4 OH and -C 3 H 6 OC 2 H 4 OH.
• R 2 , R 3 , R 4 or R 5 is optionally substituted aryl it is preferably optionally substituted phenyl or optionally substituted naphthyl, more preferably a group of the Formula (4) or (5):
• m is preferably 0, 1 or 2, more preferably 1 or 2.
• n is preferably 0 or 1.
• R a is H or C ⁇ -alky! optionally substituted by a group other than -COOH, -SO 3 H or -PO 3 H 2 .
• R a is H or C 1-2 o-alkyl, more preferably H or C ⁇ -alkyl and especially H.
• Q and Q 1 may be a straight chain or branched chain alkyl group. When any of Q or Q 1 is a branched chain alkyl group it is preferably branched at the ⁇ -carbon. In a preferred embodiment Q and Q 1 are each independently optionally substituted C 1 . 4 -alkyl.
• Q and Q 1 are each independently optionally substituted C 5 . 20 -alkyl, more preferably C 9 . 2 oalkyl.
• the substituents are preferably selected from hydroxy, cyano, halo (especially F or Cl), nitro, C ⁇ -alkoxy, C ⁇ -hydroxyalkoxy, a 5 or 6 membered heterocyclic group, or a group represented by T, wherein T is as hereinbefore defined. It is preferred, however, that Q and Q 1 are unsubstituted. Preferably R 4 and R 5 are not both optionally substituted aryl.
• the substituents are preferably selected from hydroxy, C,- 6 -alkoxy, hydroxy-C ⁇ -alkoxy, C.,. 6 -alkyl and C,. 6 -alkyl substituted by hydroxy or a group represented by T as hereinbefore defined. More preferably the substituents are selected from C ⁇ -alkyl or a group of the formula -C ⁇ -alkylene-T.
• R 4 and R 5 together with the nitrogen to which they are attached form a 5 or 6 membered ring it is morpholinyl or piperazinyl optionally substituted by C ⁇ -alkyl or Cj- 4 -hydroxyalkyl.
• R 2 , R 3 , R 4 and R 5 each independently is H, C,. 30 -alkyl optionally substituted by hydroxy, a 5 or 6 membered heterocyclic group or a group represented by T, or R 4 and R 5 together with the nitrogen to which they are attached form an optionally substituted morpholinyl, piperidinyl or piperazinyl ring.
• L 1 or L 2 is -NR 4 R 5 it is preferably a group of the formula -NHR 5 , morpholinyl or piperazinyl optionally substituted by C ⁇ -alkyl or a group of the formula -(Cj-e-alkylene)- T, wherein T and R 5 are as hereinbefore defined.
• L 1 and / or L 2 is a group of the formula -NHR 5 it is preferably of the formula - NHR b , wherein R b is -(C 1 . 6 -alkylene)O(C 1 . 6 -alkylene)OR 10 ; a group of the Formula (4); or C 1 - 30 -alkyl optionally substituted by furanyl, tetrahydrofuranyl, -OH, T, phenyl or phenyl substituted by one or more C ⁇ -alkyl groups, wherein T, R 10 and Formula (4) are as hereinbefore defined.
• R b is Cj-ao-alkyl optionally substituted by furanyl, tetrahydrofuranyl, -OH or T wherein T is as hereinbefore defined. More preferably R is C 1-30 -alkyl optionally substituted by two or more -OH groups. It is especially preferred that R is Cj-e-alkyl optionally substituted by two to five -OH groups.
• a further preferred group of the formula -NHR b is of the formula -NH(C d H 2d )-T wherein d is 1 to 6.
• X 1 and X 2 each independently is -O-, -S- or -NR 12 -;
• W 1 and W 2 each independently is H, a group T, -OC ⁇ -alkylene -OR 10 ,
• X 1 -(C p H 2p )W 1 and X 2 -(C q H 2q )W 2 each independently form a piperazine or morpholine ring optionally substituted by C ⁇ -alkyl, hydroxy-C ⁇ -alkyl, -CO(C 1-4 -alkyl) or a group of the formula -M-NR 8 R 9 ; and
• R 1 , R 8 , R 9 , R 10 and T are as hereinbefore defined; provided that:
• W 1 , W 2 and R 12 are free from carboxy, sulpho and -P0 3 H 2 groups;
• each p and q independently is from 1 to 6. In another preferred embodiment p and q independently is from 7 to 20, more preferably 9 to
• W 1 and W 2 each independently is H, a group T, hydroxy or a 5 or 6 membered heterocyclic group, wherein T and R 10 are as hereinbefore defined.
• the compounds of Formula (6) provide prints which exhibit a particularly high light-fastness and good water-fastness when incorporated into inks for ink jet printing.
• R 12 is preferably H or C,- 4 -alkyl optionally substituted by hydroxy. It is especially preferred that R 12 is H.
• a second preferred embodiment of the present invention comprises a compound of Formula (6) and salts thereof wherein :
• X 1 and X 2 are each independently -NR 12 - (preferably -NH-); and W 1 , W 2 , R 1 , R 12 , p and q are as hereinbefore defined; provided that:
• W 1 , W 2 and R 12 are free from carboxy, sulpho and -PO 3 H 2 groups;
• a third preferred embodiment of the present invention comprises a compound of Formula (6) and salts thereof wherein :
• X 1 and X 2 are each independently -NR 12 - (preferably -NH-); W 1 and W 2 are each independently H, -NH 2 , -NR 13 CO(C 1-4 -alkyl) -OC g-alkylene-OH, Cj-e-alkoxy morpholinyl or tetrahydrofuranyl;
• R 13 is H or C ⁇ -alkyl
• R 12 is as hereinbefore defined; provided that W 1 , W 2 and R 12 are free from carboxy, sulpho and -PO 3 H 2 groups.
• a fourth preferred embodiment of the present invention comprises a compound of the Formula (7) or a salt thereof:
• R ⁇ X 1 , X 2 , W 1 , Q, n, m and p are as hereinbefore defined; provided that W ⁇ X 1 , X 2 and each Q are free from carboxy, sulpho and -PO 3 H 2 groups.
• Especially preferred compounds of the Formula (7) are those wherein R 1 is H or C ⁇ -alkyl; X 1 and X 2 are each independently -S- or -NR 12 - (more preferably -NH-), wherein R 2 is as hereinbefore defined; W 1 is H, tetrahydrofuranyl, -OH, phenyl or phenyl substituted by one or more C 1-4 alkyl group(s); each Q independently is C ⁇ o-alkyl (more preferably C ⁇ -alkyl); m is 0, 1 or 2; n is 0 or 1 and p is 1 to 20 (more preferably 5 to 20, and especially 9 to 20).
• a fifth preferred embodiment of the present invention comprises compounds of the Formula (1 ) and salts thereof wherein G is -SO 3 H and is attached ortho to the azo group; L and L 2 independently are -NHR 14 wherein R 14 is C ⁇ o-alkyl optionally substituted by two or more -OH groups (more preferably C ⁇ -alkyl optionally substituted by two to five -OH groups); and R 1 is H or C ⁇ -alkyl.
• the compounds of the invention may be in the free acid or salt form.
• Preferred salts are water-soluble, for example alkali metal salts, especially lithium, sodium and potassium salts, ammonium and substituted ammonium salts.
• alkali metal salts are those with sodium.
• ammonium and substituted ammonium salts have cations of the formula + NV 4 wherein each V independently is H or optionally substituted alkyl, or two groups represented by V are H or optionally substituted alkyl and the remaining two groups represented by V, together with the N atom to which they are attached, form a 5- or 6- membered ring (preferably a morpholinyl, pyridinyl or piperidinyl ring).
• each V independently is H or C,. 4 -alkyl, more preferably H, CH 3 or CH 3 CH 2 , especially H.
• the cation is preferably ammonium (i.e. + NH 4 ).
• Examples of cations include + NH 4 , morpholinium, piperidinium, pyridinium, (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 ,
• the compounds may be converted into a salt using known techniques.
• an alkali metal salt of a compound may be converted into a salt with ammonia or an amine by dissolving an alkali metal salt of the dye in water, acidifying with a mineral acid and adjusting the pH of the solution to pH 9 to 9.5 with ammonia or the amine and removing the alkali metal cations by dialysis.
• the present invention covers all tautomeric forms of the dyes shown in this specification, for example the hydrazo tautomers.
• the present invention also covers mixtures comprising one or more compounds of the Formula (1); and mixtures comprising one or more compounds of the Formula (1) and one or more dye (preferably a magenta dye), other than a compound of Formula (1).
• the compounds of the invention may be prepared using conventional techniques for the preparation of azo dyes.
• a suitable method comprises condensing a compound of the Formula (8) with a compound of the Formula L 2 H:
• the condensation is preferably performed in a liquid medium, more preferably an aqueous medium and especially water. Temperatures of 15°C to 100°C are preferred, more preferably from 60 to 70°C. Preferably a reaction time of 1 to 48, more preferably 3 to 24 hours is used.
• the condensation is preferably performed in the presence of a base.
• the base may be any inorganic base for example, ammonia, an alkali metal or alkali earth metal hydroxide, carbonate or bicarbonate, or an organic base.
• Preferred organic bases are tertiary amines for example, N-alkylated heterocycles, for example N-(C 1 . 4 - alkyl)morpholine, N-(C 1 .
• the amount of base used may be varied between wide limits but it is preferred to use less than 40, more preferably less than 10 and especially from 3 to 5 moles for each mole of the compound of Formula (8).
• the product may be isolated by precipitating the product as a salt from the reaction mixture for example by the addition of a suitable alkali metal salt, especially sodium chloride.
• the product may be isolated in its free acid form by acidifying the reaction mixture, preferably using a mineral acid, especially hydrochloric acid. Where the product precipitates as a solid it may be separated from the mixture by filtration.
• unwanted anions may be removed from the product of the above process by dialysis, osmosis, ultrafiltration or a combination thereof.
• the product of the above process may be converted, if desired, to the NH 4 + , quaternary ammonium or organic amine salt by the addition of ammonia, ammonium hydroxide, primary, secondary, tertiary or quaternary amine.
• the base used in the condensation process is an organic amine an excess may be used so that the compound of Formula (1) is formed as the organic amine salt.
• the compound of the Formula (8) may be prepared using conventional techniques, for example by: (1 ) diazotising the compound of the formula:
• the diazotisation in stage (1) is preferably performed in an aqueous medium at a pH below 7 in the presence of a suitable diazotisation agent.
• Dilute mineral acid e.g. HCI or H 2 SO 4
• the diazotisation agent is formed in-situ, for example by dissolving an alkali metal nitrite, preferably sodium nitrite, in a molar excess of mineral acid, preferably HCI.
• an alkali metal nitrite preferably sodium nitrite
• mineral acid preferably HCI.
• at least one mole of diazotisation agent per mole of the amine in stage (1) preferably from 1 to 1.25 moles will be used in the diazotisation.
• the temperature of the diazotisation is not critical and may conveniently be carried out at from -5°C to 20°C, preferably from 0 to 10°C and especially from 0 to 5°C.
• the hydrolysis in stage (3) is preferably performed at a pH in the range 9 to 14.
• the temperature during hydrolysis is preferably from 40 to 90°C.
• the compounds of Formula (1) are useful as dyes, especially for the coloration of inks for ink jet printing.
• an ink comprising:
• L 3 is L or a labile atom or group
• L 4 is L 2 or a labile atom or group
• A, R 1 , G, L 1 and L 2 are as hereinbefore defined; provided that:
• L 3 and L 4 are free from carboxy, sulpho and -PO 3 H 2 groups;
• L 3 and L 4 are not both hydroxyethylamino.
• L 3 or L 4 is a labile atom or group, it is preferably an atom or group which is bound by a chemical bond to the compound of Formula (9) which is displaceable by a hydroxyl group of cellulose under mildly alkaline aqueous conditions to form a covalent bond between the compound of Formula (9) and cellulose.
• Preferred labile atoms and groups represented by L 3 and L 4 include halogen atoms, for example F and Cl; thiocyano groups; quaternary ammonium groups, for example trialkylammonium groups and optionally substituted pyridinium groups.
• L 3 is L 1 and L 4 is L 2 as hereinbefore defined.
• the compound of Formula (9) is preferably of Formula (1), more preferably of Formula (6) or (7), as hereinbefore defined.
• the number of parts of component (a) is preferably from 0.1 to 20, more preferably from 0.5 to 15, and especially from 1 to 5 parts.
• the number of parts of component (b) is preferably from 99.9 to 80, more preferably from 99.5 to 85, especially from 99 to 95 parts.
• component (a) When the medium is a mixture of water and an organic solvent or an organic solvent free from water, preferably component (a) is completely dissolved in component (b). Preferably component (a) has a solubility in component (b) at 20°C of at least 10%. This allows the preparation of concentrates which may be used to prepare more dilute inks and reduces the chance of the compound of Formula (9) precipitating if evaporation of the liquid medium occurs during storage.
• the weight ratio of water to organic solvent is preferably from 99:1 to 1 :99, more preferably from 99:1 to 50:50 and especially from 95:5 to 80:20.
• the organic solvent present in the mixture of water and organic solvent is a water-miscible organic solvent or a mixture of such solvents.
• Preferred water- miscible organic solvents include C ⁇ -alkanols, preferably methanol, ethanol, n-propanol, isopropanol, n-butanol, sec-butanol, tert-butanol, n-pentanol, cyclopentanol and cyclohexanol; linear amides, preferably dimethylformamide or dimethylacetamide; ketones and ketone-alcohols, preferably acetone, methyl ether ketone, cyclohexanone and diacetone alcohol; water-miscible ethers, preferably tetrahydrofuran and dioxane; diols, preferably diols having from 2 to 12 carbon atoms, for example pentane-1,5-diol, ethylene glycol,
• Especially preferred water-soluble organic solvents are cyclic amides, especially 2- pyrrolidone, N-methyl-pyrrolidone and N-ethyl-pyrrolidone; diols, especially 1 ,5-pentane diol, ethyleneglycol, thiodiglycol, diethyleneglycol and triethyleneglycol; and mono- C ⁇ -alkyl and C ⁇ -alkyl ethers of diols, more preferably mono- C ⁇ -alkyl ethers of diols having 2 to 12 carbon atoms, especially 2-methoxy-2-ethoxy-2-ethoxyethanol.
• the solvent preferably has a boiling point of from 30° to 200°C, more preferably of from 40° to 150°C, especially from 50 to 125°C.
• the organic solvent may be water-immiscible, water-miscible or a mixture of such solvents.
• Preferred water- miscible organic solvents are any of the hereinbefore described water-miscible organic solvents and mixtures thereof.
• Preferred water-immiscible solvents include, for example, aliphatic hydrocarbons; esters, preferably ethyl acetate; chlorinated hydrocarbons, preferably CH 2 CI 2 ; and ethers, preferably diethyl ether; and mixtures thereof.
• the liquid medium comprises a water-immiscible organic solvent
• a polar solvent is included because this enhances solubility of the compound of Formula (9) in the liquid medium.
• polar solvents include C ⁇ -alcohols.
• the liquid medium is an organic solvent free from water it comprises a ketone (especially methyl ethyl ketone) &/or an alcohol (especially a C 1-4 -alkanol, more especially ethanol or propanol).
• the organic solvent free from water may be a single organic solvent or a mixture of two or more organic solvents. It is preferred that when the medium is an organic solvent free from water it is a mixture of 2 to 5 different organic solvents. This allows a medium to be selected which gives good control over the drying characteristics and storage stability of the ink.
• Ink media comprising an organic solvent free from water are particularly useful where fast drying times are required and particularly when printing onto hydrophobic and non-absorbent substrates, for example plastics, metal and glass.
• Preferred low melting solid media have a melting point in the range from 60°C to 125°C.
• Suitable low melting point solids include long chain fatty acids or alcohols, preferably those with C 18 . 24 chains, and sulphonamides.
• the compound of Formula (9) may be dissolved in the low melting point solid or may be finely dispersed in it.
• the compounds of the Formula (9) exhibit a high solubility in aqueous media, accordingly it is preferred that the liquid medium is a mixture of water and one or more water miscible organic solvent(s).
• composition may also contain additional components conventionally used in ink jet printing inks, for example viscosity and surface tension modifiers, corrosion inhibitors, biocides, kogation reducing additives and surfactants which may be ionic or non-ionic.
• additional components conventionally used in ink jet printing inks, for example viscosity and surface tension modifiers, corrosion inhibitors, biocides, kogation reducing additives and surfactants which may be ionic or non-ionic.
• the compounds of the Formula (9) may be, and preferably are, purified to remove undesirable impurities before they are incorporated into inks for ink jet printing. Conventional techniques may be employed for purifying the compounds, for example osmosis and / or dialysis.
• the ink preferably has a concentration of less than 100 parts per million, more preferably less than 50 parts per million, in total of undesirable ions, for example halide ions, silicon ions, peroxide radicals and divalent and trivalent metals.
• undesirable ions for example halide ions, silicon ions, peroxide radicals and divalent and trivalent metals.
• a third aspect of the present invention provides a process for printing an image on a substrate comprising applying thereto an ink containing a compound of Formula (9) as hereinbefore defined by means of an ink jet printer.
• the ink used in this process preferably comprises a composition as defined in the second aspect of the present invention.
• the ink jet printer preferably applies the ink to the substrate in the form of droplets which are ejected through a small orifice onto the substrate.
• Preferred ink jet printers are piezoelectric ink jet printers and thermal ink jet printers.
• thermal ink jet printers programmed pulses of heat are applied to the ink in a reservoir by means of a resistor adjacent to the orifice, thereby causing the ink to be ejected in the form of small droplets directed towards the substrate during relative movement between the substrate and the orifice.
• piezoelectric ink jet printers the oscillation of a small crystal causes ejection of the ink from the orifice.
• the substrate is preferably paper, plastic, a textile, metal or glass, more preferably paper, an overhead projector slide or a textile material, especially paper.
• Preferred papers are plain or treated papers which may have an acid, alkaline or neutral character.
• Examples of commercially available treated papers include HP Premium Coated Paper (available from Hewlett Packard), HP Photopaper (available from Hewlett Packard), Stylus Pro 720 dpi Coated Paper, Epson Photo Quality Glossy Film (available from Seiko Epson Corp.), Epson Photo Quality Glossy Paper (available from Seiko Epson Corp.), Canon HR 101 High Resolution Paper (available from Canon), Canon GP 201 Glossy Paper (available from Canon), and Canon HG 101 High Gloss Film (available from Canon).
• a fourth aspect of the present invention provides a paper, an overhead projector slide or a textile material printed with an ink according to the second aspect of the present invention, or by means of the process according to the third aspect of the present invention.
• the substrate is a textile material
• the ink according to the invention is preferably applied thereto by: i) applying the composition to the textile material using an ink jet printer; and ii) heating the printed textile material at a temperature of from 50°C to 250°C.
• Preferred textile materials are natural, synthetic and semi-synthetic materials.
• Examples of preferred natural textile materials include wool, silk, hair and cellulosic materials, particularly cotton, jute, hemp, flax and linen.
• Examples of preferred synthetic and semi-synthetic materials include polyamides, polyesters, polyacrylonitriles and polyurethanes.
• the textile material has been treated with an aqueous pre-treatment composition comprising a thickening agent and optionally a water-soluble base and a hydrotropic agent and dried prior to step i) above.
• the pre-treatment composition preferably comprises a solution of the base and the hydrotropic agent in water containing the thickening agent. Particularly preferred pre- treatment compositions are described more fully in European Patent Application NO.534660A1.
• a fifth aspect of the present invention provides an ink jet printer cartridge containing an ink, wherein the ink contains a compound of the Formula (9) as hereinbefore defined in relation to the second aspect of the present invention.
• the ink in the ink jet printer cartridge is an ink according to the second aspect of the present invention.
• stage (i) The acetyl group present on the product of stage (i) was removed by alkaline hydrolysis by adding concentrated sodium hydroxide (200ml) to the mixture resulting from stage 1 and heating at 70-80°C for 1.5 hours. After cooling to room temperature, the pH was adjusted to 7 by the addition of concentrated hydrochloric acid. Sodium chloride (20% weight/volume) was added and the precipitated solid was collected by suction filtration, washed with 30% brine and dried at 70°C. Yield 172.5g (strength 52%).
• stage (ii) (0.15moles) was dissolved in water (500ml) at pH7. Cyanuric chloride (0.17moles) was dissolved in acetone (300ml) and added dropwise over 10 minutes to the stirred solution at 0-5°C. The mixture was stirred for 40 minutes at this temperature.
• the mixture was cooled to room temperature and evaporated to dryness.
• the solid was slurried in methylated spirits, collected by suction filtration and washed with further methylated spirits.
• stage (iv) The product of stage (iv) was redissolved in distilled water and dialysed using Visking tubing to a permeate conductivity of below 100 ⁇ S. The solution was evaporated to dryness. Yield 100g.
• Ink I was prepared by dissolving 2 parts of Dye (1) in 98 parts of a mixture comprising 90 parts water and 10 parts 2-pyrrolidone.
• Ink Jet Printing Ink I was loaded into an Hewlett Packard 560C ink jet printer and was printed onto
• HP Premium Glossy Paper available from Hewlett Packard.
• the resulting print was a bright magenta which had a good optical density and excellent light fastness.
• the optical density of the print was 2.29, as measured using an X-Rite densitometer.
• the print exhibited a ⁇ E value of 3 and an optical density loss of 11 % after 64 hours irradiation in the Atlas Weatherometer.
• the prints had a chroma of 75, as measured using an X-Rite densitometer.
• the dyes provided bright magenta prints with a good optical density, water-fastness and high light-fastness when incorporated into inks which were applied to a paper substrate using an ink jet printer as described above in Example 1.
• Further dyes of the Formula (A) may be prepared by condensing the product of stage (iii) in Example 1 with the compound of the formula L 1 H, followed by a further condensation with the compound L 2 H, wherein L 1 H and L 2 H are shown in Table 3.
• the inks described in Tables 4 to 7 may be prepared wherein the Dye described in the first column is the Dye made in the above Example of the same number. Numbers guoted in the second column onwards refer to the number of parts of the relevant ingredient and all parts are by weight.
• the ink may be applied to paper by thermal or piezo ink jet printing.
• NMP N-methyl pyrrolidone
• MIBK methylisobutyl ketone
• TBT tertiary butanol
• TDG thiodiglycol

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• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Wood Science & Technology (AREA)
• Inks, Pencil-Leads, Or Crayons (AREA)
• Ink Jet Recording Methods And Recording Media Thereof (AREA)

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• 1997
  • 1997-12-12 GB GBGB9726284.4A patent/GB9726284D0/en not_active Ceased
• 1998
  • 1998-12-09 AU AU14415/99A patent/AU1441599A/en not_active Abandoned
  • 1998-12-09 DE DE69815884T patent/DE69815884D1/de not_active Expired - Lifetime
  • 1998-12-09 JP JP2000539093A patent/JP2002508429A/ja not_active Withdrawn
  • 1998-12-09 US US09/581,296 patent/US6517620B1/en not_active Expired - Fee Related
  • 1998-12-09 WO PCT/GB1998/003629 patent/WO1999031182A1/en not_active Ceased
  • 1998-12-09 EP EP98958344A patent/EP1037948B1/en not_active Expired - Lifetime

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