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Nanosized particles of monoazo laked pigment

A technology of lake pigments and pigment particles, which is applied in the field of nano-scale pigment particle compositions, and can solve problems such as reducing the firmness of inks

Inactive Publication Date: 2008-12-10
XEROX CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the application of crystalline waxes has certain limitations in printing, such as the brittleness of these materials, which may reduce the ink fastness required to provide wear-resistant images

Method used

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  • Nanosized particles of monoazo laked pigment
  • Nanosized particles of monoazo laked pigment
  • Nanosized particles of monoazo laked pigment

Examples

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preparation example Construction

[0076] The preparation of nanoscale particles of monoazo lake pigments, such as those listed in Table 7, involves at least one or more reaction steps. The diazotization reaction is a key step in the synthesis of monoazo lake pigments. First, a suitable aniline precursor (or diazo component DC, such as those listed in Table 1) is directly or indirectly converted into a diazonium salt, so The standard procedure includes, for example, the procedure of treating with a diazotization reagent, such as nitrous acid HNO 2 (eg, generated in situ by mixing sodium nitrite and dilute hydrochloric acid solutions) or nitrosylsulfuric acid (NSA, commercially available or prepared by mixing sodium nitrite and concentrated sulfuric acid). The acidic mixture of the diazonium salt obtained can be a solution or a suspension, preferably refrigerated in the embodiment, and metal salts (M n+ ), which will define the specific composition of the desired monoazo lake pigment product (as listed in Table...

Embodiment 1

[0148] Embodiment 1: Synthesis of Lithor rubine-potassium salt dye (precursor for preparing pigment red 57:1)

[0149] Diazotization procedure: In a 500 mL round bottom flask equipped with mechanical stirrer, thermometer and addition funnel, 2-Amino-5-methylbenzenesulfonic acid (8.82 g) was dissolved in 0.5M aqueous KOH (97.0 mL) . The resulting brown solution was cooled to 0 °C. Under the condition of keeping the temperature lower than 3°C, slowly add 20wt% sodium nitrite aqueous solution (3.28g NaNO 2 dissolved in 25mL of water). Concentrated HCl (10M, 14.15 mL) was added dropwise to the reddish-brown homogeneous mixture over 1 h keeping the internal temperature below 2°C. The mixture formed a light brown suspension, which was stirred for an additional 30 min after the addition of concentrated HCl was complete.

[0150] Coupling procedure: In a separate 2 L resin kettle, 3-hydroxy-2-naphthoic acid (8.86 g) was dissolved in a solution of KOH (8.72 g) in water (100 mL). A...

Embodiment 2

[0151] Embodiment 2: Synthesis of Lithor rubine-potassium salt dye (precursor for preparing pigment red 57:1)

[0152] Diazotization procedure: In a 500 mL round bottom flask equipped with a mechanical stirrer, thermometer and addition funnel, 2-amino-5-methylbenzenesulfonic acid (12.15 g) was dissolved in 0.5M aqueous KOH (135 mL). The resulting brown solution was cooled to 0 °C. Under the condition of keeping the temperature lower than -2°C, slowly add 20wt% sodium nitrite aqueous solution (4.52g NaNO 2 dissolved in 30mL water). Concentrated HCl (10M, 19.5 mL) was then slowly added dropwise over 1 hour while keeping the internal temperature below OC. The mixture formed a light brown suspension, which was stirred for an additional 30 min after the addition of concentrated HCl was complete.

[0153] Coupling procedure: In a separate 2 L resin kettle, 3-hydroxy-2-naphthoic acid (12.2 g) was dissolved in a solution of KOH (12.0 g) in water (130 mL). An additional 370 mL of w...

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Abstract

A nanoscale pigment particle composition includes an organic monoazo laked pigment including at least one functional moiety, and a sterically bulky stabilizer compound including at least one functional group, wherein the functional moiety associates non-covalently with the functional group; and the presence of the associated stabilizer limits the extent of particle growth and aggregation, to afford nanoscale-sized pigment particles.

Description

technical field [0001] The present invention generally relates to nanoscale pigment particle compositions, methods for preparing such nanoscale pigment particle compositions, and uses of such compositions, for example in ink compositions. Background technique [0002] Pigments are a class of colorants used in a variety of applications such as paints, plastics and inks. Dyes are often chosen as colorants for inkjet printing inks because they are readily soluble colorants, enabling the ink to be jetted. Dyes also provide inks with excellent, vivid color quality and a wide color gamut compared to conventional pigments. However, since the dyes are molecularly dissolved in the ink vehicle, they often interact undesirably, leading to poor ink performance, such as photooxidation under light (resulting in poor light fastness), dyes from the ink Diffusion into paper or other substrates (resulting in poor image quality and print-through), and dyes can leach into other solvents that ...

Claims

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Application Information

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IPC IPC(8): C09B63/00C09B67/20C09D11/00
CPCB82Y30/00C09B63/005C09B67/0005C09B67/0009C09D11/037C09D11/101C09D11/322C09D11/34C09D7/41B82B3/0061C09C3/04B82Y40/00
Inventor R·卡里尼C·G·艾伦S·J·加德纳K·W·道森P·G·奥德尔P·F·史密斯J·L·贝勒里伊
Owner XEROX CORP
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