JPH03197600A - Cellular solid soap composition containing free fatty acid - Google Patents

Abstract

PURPOSE: To provide a cell-contg. solid soap compsn. containing a free fatty acid which has improved degree of wet cracking and feel to the touch by mixing an 8-18 C alkaline metal fatty acid soap contg. a minor amt. of a trans fatty acid, an 8-18 C free fatty acid, an inorg. salt, and water together in a particular ratio.

CONSTITUTION: An 8-18C alkaline metal fatty acid soap (A), contg. about not more than 15% trans fatty acid, in an amt. of about 70 to 80%, about 0.5 to 5% 8-18C free fatty acid (B), and, when the free fatty acid content does not exceed about 1%, not more than about 0.75% inorg. salt (e.g. NaCl) are mixed with water as the balance in such a manner that the max. salt content is regulated so that about 0.1% of the max. salt content is reduced for each addition of about 1% of the free fatty acid. Thus, the cell-contg. solid soap compsn. contg. a free fatty acid is prepd. The fatty acid used in the components (A) and (B) is pref. a fatty acid prepd. by mixing a sevum fatty acid and a coconut fat and oil fatty acid and/or a palm kernel fat and oil fatty acid together in a ratio of about (70:30) to (50:50).

COPYRIGHT: (C)1991,JPO

Description

[Detailed description of the invention] [Industrial application field] Add the patents as references. Such aerated bar soap compositions containing free acids are highly desirable from the standpoint of skin compatibility and lathering.

[Prior Art and Problems] U.S. Pat. No. 3,835,058 discloses compositions of the type of the present invention. The types and levels of ingredients are similar.

SUMMARY OF THE INVENTION The present invention provides that aerated bar soap compositions containing free fatty acids contain about 15% of the fatty acids when quantified by separating the fatty acids from the composition and analyzing them.

Additionally, the level of inorganic salts that can be present in the aerated bar soap composition is directly related to the amount of fatty acids it contains.

The higher the amount of fatty acids, the smaller the amount of inorganic salt can be present to maintain the proper viscosity of the claracha mix.

The aerated bar soap compositions of the present invention contain from about 70% to about 8%
0%, preferably about 73% to about 75% alkali metal fatty acid soaps, the fatty acids containing about 8 to about 18 carbon atoms, and about 15% or less, preferably about 14% or less, about 0. The aerated bar soap compositions of the present invention contain free fatty acids of about 8 to about 18 carbon atoms; When the free fatty acid content is 1% or less, no more than about 0.75% salt is present, and for each additional 1% of free fatty acids contained, the maximum salt content is about 171%.
It decreases by 0%.

DETAILED DESCRIPTION OF THE INVENTION Alkali metal soap components suitable for use in the process of the present invention include in this case water-soluble soaps commonly used in bar soap processing processes. These water-soluble soaps are
Contains sodium or potassium soaps of higher fatty acids or mixtures thereof. Sodium soaps are preferred, especially those derived from mixtures of coconut oil and tallow. As will be apparent to those skilled in the art, water-soluble soaps derived from other fats or fatty acids may also be used.

The soaps of the invention generally contain from 8 to 18 carbon atoms. Commercially available soaps preferred for use in the present invention are generally prepared from fatty acid mixtures obtained from a variety of natural sources.

For example, coconut oil is a widely used ingredient in high quality compositions. Similarly, tallow is a useful ingredient in making high quality soaps. Other suitable materials include palm kernel oil and babassu kernel oil, encompassed within the term "coconut oil," olive oil, and synthetic fatty acids, such as those imitating tallow.

A particularly preferred soap in the present invention is coconut oil (CN
) or the sodium and potassium salts of fatty acid mixtures derived from palm kernel oil (PK○) and tallow (T), i.e. sodium or potassium tallow-coconut soaps. Preferred soap mixtures are 70:30-50:
Tallow/(coconut oil or palm kernel oil) soap in a ratio range of 50% by weight. These soap mixtures are preferred because they are readily available, easy to process, and have physical properties and performance within a desirable range.

The term [coconut] used in the present invention in relation to soaps or free fatty acid mixtures refers to the approximate carbon chain length distribution:
8%C8, 7%C1o, 48%C12, 17%C14,
9Zc 16.2%Cts, 7%, t-rain 112.2
%')) - refers to a material that has an acid (the first 6 fatty acids are saturated).

The term "tallow" means approximate chain length distribution = 2.5%C□4.2
9% C 6.23% C18, 2% palmitolic acid, 41
．． 5% oleic acid, and 3% linoleic WR (first 3
Refers to soap mixtures with fatty acids (saturated).

Fatty acids that can be used in the process of the present invention range from 8 to
It has 18 carbon atoms. Generally mixtures of free fatty acids derived from natural sources are used. A preferred fatty acid mixture is the coconut/tallow fatty acid mixture described above. As mentioned above, levels of trans fatty acids should be minimal. When fatty acids are "hardened", for example by hydrogenation, trans fatty acid levels increase, so simply hydrogenating to a lower degree is a convenient method for obtaining the desired fatty acids.

Free fatty acids improve the amount and quality of lather in soap bars produced by the method of the invention. It is known in the art that free fatty acids are effective in producing foam consisting of small cells with the desired stability to obtain a rich or creamy foam.

Fatty acids also exhibit emollient effects that soften the skin or improve skin feel properties and remove excess alkalinity.

The amount of free fatty acids contained in the finished bar soap of this invention is about 0.5% to about 5%. Below about 0.25%, the desired advantages mentioned above are not readily achieved. Even if it exceeds 5%, there is no benefit, it is economically disadvantageous, and it gradually shows a negative effect on the softening properties of bar soap. The preferred amount of free fatty acids is about 1% to about 3%.

Free fatty acids can be incorporated into the bar soap of the present invention in a variety of ways. The free fatty acid component is preferably used to prepare the solid composition and is mixed into the soap mixture prior to or concurrently with the high shear mixing step. Uniform distribution of free fatty acids in the finished soap bar is easily achieved by high shear action. The free fatty acids can be added after the high shear mixing step if other mixing means are subsequently used to uniformly distribute the free fatty acids throughout the interior of the soap mixture or bar.

Preferably, the free fatty acid component is introduced into the soap mixture of the present invention by adding the free fatty acid to the soap mixture during the initial blending step.

Alternatively, the free fatty acids can be introduced before or during the aerating step, in which fragrances and other additives, if desired, can be introduced as a premix, such as an acid reaction mixture of the soap and free fatty acids of the soap mixture. I can do that.

The bar soap composition of the present invention can contain other additives commonly included in cosmetic bar soaps, such as fragrances, disinfectants or antibacterial agents, dyes, and the like. These additives make the finished soap bar more attractive or effective without detracting from the desired attributes of the bar.

The bar soap composition of the present invention can further contain a water-soluble inorganic non-soap synthetic detergent. Generally, about 3=1 to about 9=
A soap/synthetic detergent bar is produced containing a soap:synthetic detergent ratio of 1. Selection of the appropriate ratio depends on the synthetic detergent used, the desired performance, the physical properties of the finished soap, temperature, moisture and similar processing conditions. The preferred ratio is about 5:
1 to about 7=1.

The synthetic detergent components of the bar soap composition of the present invention are selected from the group consisting of anionic detergents, nonionic detergents, amphoteric detergents, and Zvitta ionic synthetic detergents, and this is included as a reference.

Preferred synthetic detergents are water-soluble salts of organic sulfonic acid esters and aliphatic sulfuric esters, i.e., about 1% in the molecular structure.
A water-soluble salt of an organic sulfuric acid reaction product having an alkyl group of 0 to 22 carbon atoms and a radical selected from sulfonic acid and sulfuric acid ester radicals.

Synthetic sulfuric acid detergents of particular interest are alkali metal salts of normally solid sulfuric esters of normal primary aliphatic alcohols having 10 to 22 carbon atoms. That is, it is possible to use the sodium and potassium salts of alkyl sulfates obtained from the reduction of tallow or mixed higher alcohols derived from the reduction of coconut oil, palm kernel oil, babassu kernel oil or other oils of the coconut family. can.

Other aliphatic sulfate esters suitable for use in the present invention include water-soluble salts of sulfate esters of polyhydric alcohols that are incompletely esterified with high molecular weight soap-forming carboxylic acids. Synthetic detergents of this type include water-soluble alkali metal salts of sulfuric esters of high molecular weight fatty acid monoglycerides, such as sodium and potassium salts of coconut oil M acid monoester of 1,2-hydroxypropane-3-sulfuric ester, monomyristoyl ethylene glycol sulfate. Sodium and potassium, monolauroyl diglycerol sulfate sodium and potassium.

Preferred sulfonic acid detergents contain 10-18 in the alkyl group.
Contains alkyl glyceryl ether sulfonic acid detergents having carbon atoms (i.e., water-soluble @ of alkyl glyceryl ether sulfonic acids). These sulfonates form the bar soap of the present invention having the desired lime soap or scum monodispersion properties and having the desired texture uniformity and appearance as described above. It can be processed to form a detergent bar soap composition. Preferably, these sulfonate salts constitute from about 5% to about 15% of the finished soap bar. These sulfonates can be prepared by first reacting the fatty alcohol with epichlorohydrin and reacting the alkyl chloroglyceryl ether thus formed with sodium or potassium sulfite. Preferred fatty alcohol sources used in the above reaction are coconut oil and similar alcohols. Alkyl glyceryl ether sulfonic acids are described in detail in US Pat. No. 2,898,547.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments shown in the drawings. All percentages, parts and ratios are by weight unless otherwise specified.

A basic soap consisting of a 70T/30PKO mixture with about 30% moisture is dried to about 23.5% moisture and the minor ingredients are added. Fatty acid and salt levels are shown in the table. The soap with minor components is pumped into a high shear mixer to mix the fatty acids and soap, and the resulting mixture is placed into a scraped wall heat exchanger where the temperature is raised to about 215°C.
"F' to about 150"F'. Push out the soap, cut the plug, cool and condition.

Next, the obtained bar soap is stamped, bundled and packaged. The composition of each composition is as follows.

1-12 70T/30PKO soap -73-1474,49
(100%Na) 70T/30PKO soap 75.2 (80Na/20K> C11 free fatty acid -2,501,00 water
Road, 5 23.5 23.5 fragrance
0.16 0.16 0.16 Preservative
0.24 0.20 0.2ONaC10,9
0 (L50 0-65 trans fatty acids%8-15
14.2 1L9 wet cracking degree 9 8 8 Bar soap texture 9 9 8 (new) Bar soap texture 8 9 7 (aged) 74.44 72.94 2.75 23.5 0.16 0.20 0. 45 17.5 (crude) 7 1.00 23.5 0.16 0.20 0.70 21.3 No rating 4 (crude) Compositions 1 and 2 shown in Table 1 above have low trans fatty acid content Compositions 3 and 4 contain high trans fatty acids and have low wet cracking and solid soap dust, while compositions 3 and 4 contain high trans fatty acids and have low wet cracking and solid soap dust.

The scale used for these wet crack ratings and solid feel dust is from 1 to 10, with 1 being bad and 10 being excellent. These grades are evaluated by a panel of two or three trained graders. After storage for 3 months at a temperature of 100℃, the ripening texture is measured.

3 14

Claims (1)

Claims: 1. A. about 70% to about 80% alkali metal fatty acid soap containing about 8 to 18 carbon atoms and containing no more than about 15% trans fatty acids; and B. about 8 to about 80% alkali metal fatty acid soap. about 0.5% to about 5% free fatty acids containing 18 carbon atoms;
and not more than 75% salt, with the maximum salt content decreasing by about 0.1% for each addition of about 1% of free fatty acids;
D. A foam-containing bar soap composition containing residual water. 2. The composition of claim 1, wherein the trans fatty acid soap content is about 14% or less. 3. The composition of claim 2, wherein the free fatty acid content is about 1% to about 3%. 4. The composition of claim 1, wherein the free fatty acid content is about 1% to about 3%. 5. Fatty acid soap and fatty acids are (1) tallow fatty acid and (2)
derived from a combination with a fatty acid selected from the group consisting of coconut oil fatty acids, palm kernel oil fatty acids, and mixtures thereof, wherein the ratio of (1) and (2) is from about 70:30 to about 50:50. The composition according to claim 1, characterized in that: 6. The composition of claim 5, wherein the trans fatty acid soap content is about 14% or less. 7. The composition of claim 6, wherein the free fatty acid content is about 1% to about 3%. 8. The composition of claim 5, wherein the free fatty acid content is from about 1% to about 3%.