Laundry detergent

A technology of laundry detergent and surfactant, applied in the field of laundry detergent composition, can solve the problems of reducing the aesthetic value of fabrics, yellowing, etc., and achieve the effects of improving hydrolysis resistance, improving reactivity, and improving directness

Active Publication Date: 2021-08-31
UNILEVER IP HLDG BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many fabrics are white, but over the life of these fabrics, the white color fades or turns yellow, reducing the aesthetic value of the fabric

Method used

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Examples

Experimental program
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preparation example Construction

[0066] Preparation of blue or violet azo dyes

[0067] Preferred disazo dyes can be synthesized via well-known azo coupling reactions, such as

[0068]

[0069] in for

[0070] WO2012 / 054058 describes having at least one -CH=CH 2 Synthesis of various disazo dyes of group-terminated polyalkoxy chains, although such dyes also contain additional -COOH groups.

[0071] The synthesis of monoazothiophene dyes is described in US4912203 and WO2011 / 017719. The main coupling reactions are:

[0072]

[0073] where R 1 and R 2 At least one of them represents alkoxy-CH=CH 2 or -CH=CH 2 Capped polyalkoxy groups.

[0074] -CH=CH 2 Parts can be obtained by dehydrating the corresponding ethoxylated material as follows:

[0075]

[0076] and

[0077]

[0078] Dehydration of terminal alcohol groups can be achieved by heating in the presence of a strong acid such as sulfuric or phosphoric acid, followed by purification.

[0079] Additional advantages of the shading d...

Embodiment 1

[0140] Liquid laundry detergents can be prepared with the following formulations:

[0141]

[0142] The liquid laundry detergent contained 0.001% by weight of a hueing dye according to the structure (Example 1, according to the invention):

[0143]

[0144] where r=1 and q is 1 (ie, r+q=2) (Example 1). As a comparative example (not according to the invention), 0.001% by weight of a hueing dye with the following structure can be used:

[0145]

Embodiment 2

[0150] A powder laundry detergent formulation can be prepared having the following formulation:

[0151] Element weight% linear alkylbenzene sulfonate 14.5 Sodium carbonate 20.0 sodium sulfate 50.0 Sodium silicate 6.0 Zeolite 2.5 Salt Spot Granules (Blue and Red) 1.8 spices 0.3 Sodium carboxymethyl cellulose 0.1 Sokalan CP5 (from BASF) 0.1 Hue Dye Granules 0.3 Minor ingredients (including fluorescent agents) and moisture to 100%

[0152] The shading dye particles are as described in WO2006 / 053598, the formulation containing 0.0004% by weight of shading dye. The hueing dye is according to the following structure (ie Example 2, according to the invention).

[0153]

[0154] where r=1 and q is 1 (ie, r+q=2) (Example 2). As a comparative example (not according to the invention), 0.001% by weight of a hueing dye of the following structure can be used:

[0155]

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Abstract

A laundry detergent composition comprising: from 2 to 70 wt. % of a surfactant; and from 0.00001 to 0.1 wt. % of shading dye which is covalently bound to at least one alkoxy-CH=CH2 or -CH=CH2 capped polyalkoxy group.

Description

technical field [0001] The present invention relates to laundry detergent compositions comprising pH stable shading dyes. The present invention also relates to a domestic method of treating fabrics using a laundry detergent composition comprising said hueing dye. Background technique [0002] There is a need to maintain the white appearance of the fabric so that the aesthetic value is maintained for as long as possible. Many fabrics are white, but over the life of these fabrics, the white color fades or turns yellow, reducing the aesthetic value of the fabric. To counteract this, laundry detergent manufacturers can introduce hueing dyes into their products. The purpose of the hueing dye is to deposit onto the fabric, thereby counteracting fading and yellowing of the fabric, usually by providing a preferred bluish violet hue to the laundered fabric. Hue dyes need to be able to deposit onto fabrics from surfactant-containing laundry liquors during the domestic laundry proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11D3/40C11D11/00C09B29/033C09B31/10C09B62/008C09B69/00
CPCC11D3/40C11D11/0017C09B69/00C09B29/0033C09B29/0808C09B62/0086C09B31/105C11D1/143C11D1/72C11D1/83C11D3/42
Inventor S·N·巴切洛N·S·布恩哈姆
Owner UNILEVER IP HLDG BV
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