10results about "Azo dye preparation" patented technology

A dichroic bis-azo biphenyl dye of the following formula:The substituents R1, R2, R3, R4 are alkyl (CnH2n+1) or alkenyl (CnH2n−1) groups with n=1-18. At least one substituent among R1R2R3R4 is different from the other substituents. A benzidine-free method of making a dichroic bis-azo biphenyl dye is provided in which the biphenyl portion of the dye is formed from different first and second mono-azo dyes by a cross-coupling reaction, which may be a Suzuki reaction. A polarizer is formed from a photoaligned layer of the bis-azo biphenyl dye on a substrate and exhibits a dichroic ratio of at least 40. Chemical modification of the photoaligned bis-azo biphenyl dye layer creates a broad-band thin film polarizer with low light scattering and high thermal and photo tolerances.

The present application relates to an azo compound represented by formula (1A). L 1 and L 2 represents a divalent linking group or a single bond. y represents 1 or 2. p and q represent 0 or 1, at least one of which is 1. X represents an oxygen atom or NR 5 5 represents a hydrogen atom or an aliphatic hydrocarbon group. R 12 13 14 represents an aliphatic hydrocarbon group or the like, and can have a polymerizable group. Q represents a single bond or a group selected from the group consisting of -OC(=O)-, -C(=O)O-, -C≡C-, -CH=CH-, -N=N-, -NHC(=O)-, and -C(=O)NH-. Ar 1 2 3 represents 1,4-phenylene or a divalent sulfur-containing aromatic heterocyclic group. In the case where y is 2, the two Ar 3 may be the same or different.​​​​​

This invention provides a diazobiphenyl dye for thin-film polarizers, which is an analog of AD1. Thin-film polarizers prepared using this dye exhibit good optical quality, such as low light scattering, high dichroism ratio, broadband absorption, and / or stability to heat and light irradiation. This invention also provides a method for preparing the diazobiphenyl dye from two different monoazo dyes via a cross-coupling reaction. This method is eco-friendly because it does not use toxic benzidine as a raw material. The product (diazobiphenyl dye) obtained by this method can be purified in a simple and convenient manner, and the diazobiphenyl dye prepared by this method can have a symmetrical or asymmetrical structure. Furthermore, this invention provides a thin-film polarizer comprising the diazobiphenyl dye and an apparatus for display applications comprising the thin-film polarizer.

To provide a laundry care composition comprising a laundry care ingredient and a polymeric thiophene hueing agent.SOLUTION: A laundry care composition comprises: (i) a laundry care ingredient; and (ii) 0.0001 wt.% to 1.0 wt.% of a polymeric thiophene hueing agent having a structure of Formula I. The polymeric thiophene hueing agent provides a whitening bias on a cellulose-containing textile article when compared to a polyester-containing textile substrate, where the whitening bias is measured via the following formula: (whitening bias)=(change in whitening of the cellulose-containing textile article / change in whitening of the polyester-containing textile article), where the whitening effect is measured via a whiteness index on each textile article.SELECTED DRAWING: None

To provide a laundry care composition which makes soiled textile articles appear brighter and whiter even at low wash temperatures and short cycle times, and to provide a method for increasing the whitening efficacy / index for textile articles.SOLUTION: A laundry care composition comprising: (i) a laundry care ingredient; and (ii) from 0.0001 to 1.0 wt% of a polymeric thiophene hueing agent of formula (III): SELECTED DRAWING: None

To provide a high-performance achromatic polarizing film which offers a high transmittance and high contract and is achromatic when displaying white and when displaying black, and to provide an achromatic polarizing plate using the same, and a display device.SOLUTION: A polarizing film is provided, comprising substances represented by the following formulas (1) and (2).SELECTED DRAWING: None

The object of this invention is to provide a color-curable resin composition that can reduce crosstalk in color filters. [Solution] The present invention relates to a colored curable resin composition comprising a colorant, a resin, a polymerizable compound, and a polymerization initiator, wherein the colorant comprises a first pigment composed of at least one selected from an orange pigment and a red pigment, and a yellow pigment, the first pigment comprises a diketopyrrolopyrrole pigment and an azo pigment, and the yellow pigment comprises CI Pigment Yellow 180.

A polarizing element which contains, in the form of a free acid: an azo compound represented by formula (1) or a salt thereof, or an azo compound represented by formula (2) or a salt thereof; and an azo compound represented by formula (3) or a salt thereof.

The invention belongs to the technical field of disperse dye synthesis, and particularly relates to a preparation method and application of a cyaniding dye. The invention discloses a cyanided dye preparation system formed by a cuprous catalyst and a cocatalyst in a synergistic manner, which is used for cyaniding dye intermediates to synthesize disperse dyes. The dye intermediate does not need secondary crystal transformation, so that the procedures are reduced, and the comprehensive consumption reduction is also facilitated; and the water resistance of the preparation system is good, the water content of the raw materials and the solvent is increased to 2%, and the yield of the cyaniding dye is still maintained above 90%. By adding the cocatalyst, acidification of a reaction system is effectively avoided, generation of by-products is inhibited, the conversion rate and the utilization rate of raw materials are improved, and the method conforms to the reduction, reutilization and recycling principles of green chemical industry.

The present invention relates to compounds of formula (I): (I) wherein R1 is a dye, and L1, R2 and R3 are as defined herein. The compounds of the invention reversibly convert from a hydrophobic form to a hydrophilic form upon contact with water and carbon dioxide. The present invention also relates to methods of dyeing fibres, and methods of decolouring dyed fibres. The method is particularly useful for dyeing polyester fibres.