Bis-azo colorants for use as bluing agents

a technology of bisazo colorants and bluing agents, which is applied in the direction of detergent compositions, organic dyes, chemistry apparatuses and processes, etc., can solve the problems of affecting the color of the treated situs, difficult to reverse yellowing by normal laundering procedures, and undesirable stains of the fabri

Active Publication Date: 2017-08-03
PROCTER & GAMBLE CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0004]This invention relates to laundry care compositions comprising bis-azo colorants that may serve as bluing agents, processes for making such laundry care compositions and methods of using the same. The bluing agents are generally comprised of at least two components: at least one chromophore component and at least one polymeric component selected from a polyalkyleneoxy and a capped polyalkyleneoxy. These bluing agents are advantageous in providing a whitening effect to fabrics, while not building up over time and causing undesirable blue discoloration to the treated fabrics.

Problems solved by technology

This yellowness is often difficult to reverse by normal laundering procedures.
Unfortunately, current bluing agents that deposit efficiently on cotton can deposit too strongly on nylon, especially at higher temperatures, thus over hueing the treated situs over multiple treatment cycles.
While it is necessary that bluing agents deposit from wash water, it is undesirable that they stain the fabric by inadvertent contact or by building up over time, i.e. overhueing.

Method used

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  • Bis-azo colorants for use as bluing agents
  • Bis-azo colorants for use as bluing agents
  • Bis-azo colorants for use as bluing agents

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0119]To a cold (0-5° C.) solution of p-polyalkyleneoxyphenylamine (27.45 grams in 100 ml of water), containing sufficient hydrochloric acid to give a pH of 1, are added 3.58 grams of sodium nitrite. The mixture is stirred for 2 hours. The mixture is then added to a cold solution of 7.65 grams of 2,5-dimethoxyaniline in dilute hydrochloric acid to give an orange colored product. This product is further diazotized by adding sufficient hydrochloric acid to keep the pH at 1 followed by 3.58 grams of sodium nitrite. After stirring 2 hours at 0-5° C., the mixture is added to an aqueous solution of 13,96 grams of N-acetyl J acid along with sufficient sodium hydroxide to dissolve the N-acetyl J acid. During the addition of the diazonium salt, the pH is kept at 10-12 by the addition of aqueous sodium hydroxide solution. This resulted in a violet colored product represented as Formula BA 1 herein.

B. Test Methods

[0120]I. Method for Determining Hueing Deposition (HD) for Dye from a Wash Soluti...

performance example

[0127]The performance of nine different bis-azo bluing agents, three comparative and six inventive, are tested and Hueing Deposition, and Selectivity Ratio are assessed according to the equations disclosed above in the methods. The results are given in the Table immediately below.

[0128]Test Results

Selectivity RatioDyeΔE*CottonΔE*Nylon(ΔE*Cotton / ΔE*Nylon)29.2419.36 1.5119.2614.91 1.2912.0321.15 0.5719.81 5.32 3.7224.57 6.58 3.7324.57 4.33 5.6723.07 3.79 6.09 7.26 0.4914.8  6.82 1.66 4.10

[0129]All the dyes show some level of deposition on cotton and nylon, The Selectivity Ratio (SR) for the comparative bis-azo bluing agents lie within a range of 0.5 to about 1.5. Substituting an acetyl or H for the phenyl ring in N-phenyl J-acid increases the SR to above 3.5 and above 5.5, respectively. Moreover, replacing the J-acid moiety with an H-acid or chromotropic acid group also leads to improved SR values.

[0130]Thus the compositions and methods of the invention provide good deposition on cell...

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Abstract

This invention relates to bis-azo colorants for use as bluing agents, laundry care compositions comprising bis-azo colorants that may serve as bluing agents, processes for making such bluing agents and laundry care compositions and methods of using the same. The bluing agents are generally comprised of at least two components: at least one chromophore component and at least one polymeric component. These bluing agents are advantageous in providing a whitening effect to fabrics, while not building up over time and causing undesirable blue discoloration to the treated fabrics.

Description

TECHNICAL FIELD[0001]This invention relates to bis-azo colorants for use as bluing agents, laundry care compositions comprising bis-azo colorants that may serve as bluing agents, processes for making such bluing agents and laundry care compositions and methods of using the same. The bluing agents are generally comprised of at least two components: at least one chromophore component and at least one polymeric component selected from a polyalkyleneoxy and a capped polyalkyleneoxy. These bluing agents are advantageous in providing a whitening effect to fabrics.BACKGROUND[0002]As textile substrates age, their color tends to fade or yellow due to exposure to light, air, soil, and natural degradation of the fibers that comprise the substrates. Thus, the purpose of bluing agents is generally to maintain the whiteness perception of these textile substrates and counteract the fading and yellowing of the substrates. Typically, bluing agents may be found in laundry detergents, fabric softeners...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C11D3/42C11D3/386C11D3/00
CPCC11D3/42C11D3/38627C11D3/0021C09B69/00C11D3/40
Inventor MIRACLE, GREGORY SCOTDITULLIO, JR., DANIEL DALEDEY, SANJEEV KUMARTORRES, EDUARDO
Owner PROCTER & GAMBLE CO
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