Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Specific organic component
Patent
1996-07-16
1999-10-05
Raymond, Richard L.
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Specific organic component
510434, 510533, 510410, 523523, C11D 310, C11D 304
Patent
active
059624019
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a detergent builder which prevents a deterioration of detergency of a detergent composition and such detergent builder of a powdered form which shows an improved mixability to the detergent composition. The present invention also relates to a process of manufacturing the above-mentioned two types of detergent builders and detergent compositions respectively containing such detergent builders.
BACKGROUND OF THE INVENTION
Conventionally, it is known that maleic acid copolymers as a polymer of water-soluble polycarboxylic acid (salts) having many carboxylic groups show excellent functions of chelation and dispersion. For these beneficial properties, such copolymers have been used in a variety of fields, such as a detergent builder of a detergent composition, a dispersant, a flocculating agent, a scale formation inhibitor, a chelating agent, and a fiber processing agent and the like.
Among the described copolymers, those having many carboxylic groups in each molecule are suitably used for the above-mentioned respective uses. In the process of manufacturing such maleic acid copolymers, to overcome the deficiency that the polymerizability thereof is generally low, it has been proposed to increase the amount of the maleic acid component to be placed in a polymerization process to introduce many carboxylic groups. However, such method has the following drawbacks.
(1) A still long time is required for the polymerization process because of the low polymerizability of the maleic acid component;
(2) When the maleic acid component is placed at a higher proportion, a greater amount of hydrogen peroxide (polymerization initiator) is required;
(3) The use of the hydrogen peroxide in a large amount results in a high content of residual hydrogen peroxide from the polymerization reaction; and
(4) In spite of the fact that the hydrogen peroxide (polymerization initiator) is used in a large amount, a content of residual unreacted maleic acid component is still high.
Furthermore, earnest researches have been made by the inventors of the present invention to find out important factors other than the content of the carboxylic acid of the maleic acid copolymer to improve the detergency of the detergent composition containing the maleic acid copolymer as a detergent builder.
As a result, the inventors of the present invention have found that it is important to improve the property of the maleic acid copolymer in its calcium ion stability constant, and the property against iron particle deposition for preventing clothes from being yellowish. Additionally, in the case of the maleic acid copolymers of high gelation properties, when using water of high hardness as water for washing, the detergency is significantly lowered as being undissolved. Thus, the inventors of the present invention have also found that it is necessary to lower the gelation properties.
As disclosed in the below-mentioned Gazettes, with the maleic acid copolymers produced under conventional reaction conditions, even if the hydrogen peroxide is used in a large amount as a polymerization initiator, it is difficult to effectively introduce the maleic acid component to a high molecular portion. Moreover, the problem of high content of residual unreacted maleic acid and hydrogen peroxide in the reaction solution upon the completion of the polymerization reaction has not been solved. Besides, the problem of high content of residual unreacted maleic acid and hydrogen peroxide remaining in the reaction solution upon completion of the polymerization reaction remains unsolved which results in low polymerizability.
The maleic acid copolymers isolated from the copolymerization reaction solution upon completion of the reaction have high concentration of hydrogen peroxide and a high content of the residual maleic acid, and maleic acid copolymers do not show desirable functions of chelation and dispersion. Therefore, such copolymers are not suited for the aforementioned purposes, and do not have sufficient levels of esse
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Maeda Yoshihiro
Yamaguchi Shigeru
Nippon Shokubai Co. , Ltd.
Raymond Richard L.
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