Compositions – Fluent dielectric – N-containing
Patent
1994-10-24
1996-05-21
Lieberman, Paul
Compositions
Fluent dielectric
N-containing
252541, 252544, 252174, 252DIG16, 252DIG5, C11D 104
Patent
active
055186653
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to N-acylglutamic acid salt-containing solid detergent compositions with mild action on skin and hair, and more specifically to N-acylglutamic acid salt-containing transparent solid detergents with improved storage stability while maintaining usabilities such as sudsing, detergency, etc.
BACKGROUND ART
Transparent soap (transparent solid detergents) is commercially valuable because of the high-grade impression by its transparency. Most of prior transparent solid detergents are made from higher fatty acid soap as the base and transparentizers such as glycerin, sucrose, sorbitol, etc. They are made by framing or milling, and in general, framed transparent soap has better transparency than milled soap. However, framing is not suitable for mass production because it takes about one month to obtain a stabilized shape. Moreover, it is known that higher fatty acid soap-based transparent soap made by these processes is not essentially different from ordinary opaque soap, that the former has the same drawbacks as the latter, e.g., irritation to skin, poor sudsing in hard water, and that it may opacify in use.
JPA55-25465 (i.e., Japanese patent application laid-open (tokkai) No. Sho 55-25465), discloses transparent solid detergents based on N-longchain acyl acidic amino acid salts, and JPA56-76499 discloses a method of manufacturing milled transparent solid detergents using N-long chain acylglutamic acid salts.
However, such transparent solid detergents disclosed in these patent documents have low storage stability, because the triethanolamine salt or the sodium salt is used as the N-longchain acylglutamic acid salt. Thus, the triethanolamine salt-based detergents become browned when stored at high temperatures, and the sodium salt-based detergents gradually crystalize during storage and finally opacify. Moreover, these transparent solid detergents still need further improvement on their usabilities such as sudsing, disintegration, adhesion, etc.
In view of the prior art described above, an object of this invention is to provide N-longchain acylglutamic acid salt-containing transparent solid detergents which have improved usabilities such as sudsing, disintegration, adhesion, etc., while maintaining storage stability in connection with their transparency and non-coloration, and which are less irritant to skin, hair, ocular mucosa, etc.
DISCLOSURE OF THE INVENTION
As the results of elaborate studies to attain the above object, the present inventors have found that less irritant transparent solid detergents which are free from coloration and crystallization and are provided with good storage stability enough to maintain their transparency and with good usabilities such as sudsing, disintegration, adhesion, etc. can be obtained by using concurrently as the base two certain salts of N-acylglutamic acid, namely the potassium and sodium salts each having a certain neutralization degree in a certain ratio, and thus completed this invention on the basis of those findings.
Therefore, this invention relates to a transparent solid detergent comprising N-acylglutamic acid salts characterized in that said salts are the potassium and sodium salts, each having a neutralization degree of between 1.5 and 2.0, said potassium and sodium salts being in a molar ratio of 9:1 to 2:8 and being incorporated in a combined amount of 30 to 70% by weight of the total weight of said detergent.
This invention will now be explained in detail, as follows.
The acyl groups of the N-acylglutamic acid salts used in the transparent solid detergents according to this invention are those which can be derived from saturated or unsaturated fatty acids having 10 to 22 carbon atoms, e.g., those derivable from single composition fatty acids such as lauric acid, palmitic acid, stearic acid, and oleic acid. The acyl groups can also be those derivable from mixed fatty acids from the natural source such as coconut oil fatty acid, tallow fatty acid, hardened tallow fatty acid, etc., as well as those derivable from chemi
REFERENCES:
patent: 3663459 (1972-05-01), Yoshida et al.
patent: 3926828 (1995-12-01), O'Neill et al.
patent: 4165293 (1979-08-01), Gordon
patent: 4273684 (1981-06-01), Nagashima et al.
patent: 5098608 (1992-03-01), Miyazawa et al.
Database WPI, Derwent Publications Ltd., AN 81-58023D [32], "Preparation of Transparent Pasty Detergent", JP-A-56 076 500, Jun. 24, 1981.
Kaneko Daisuke
Sakamoto Kazutami
Ajinomoto Co. Inc.
Lieberman Paul
Tierney Michael P.
LandOfFree
Transparent solid detergents does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Transparent solid detergents, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transparent solid detergents will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2035585