Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
1999-07-09
2001-12-18
Douyon, Lorna M. (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S127000, C510S292000, C510S327000, C510S328000, C510S340000, C510S394000, C510S437000, C510S515000, C510S522000, C510S526000, C252S008630, C252S008810, C252S008910, C424S070100, C514S881000
Reexamination Certificate
active
06331511
ABSTRACT:
The present invention relates to a detergent composition with a softening and protective action of natural fibers.
Softening compositions are widely used for domestic detergents for improving the softness of delicate fabrics (wool and silk). These compositions mainly consist of aqueous emulsions which cannot be used in the actual washing phase, but only in the final rinsing phase. This is mainly due to the incompatibility of the softening agents widely used, consisting of quaternary ammonium salts, particularly dimethyl ditallowyl ammonium chloride (DDTAC) and distearyl ammonium chloride. The above quaternary salts, in the presence of anionic surface-active agents, would produce compounds insoluble in water with a consequent loss in effectiveness of the softening action.
The high effectiveness of these ammonium derivatives has the disadvantage of the toxicological aspect of these products and particularly their high aquatic toxicity which has recently considerably restricted their use in the formulation of domestic detergents. This has led to the search for new softening substances with an environmental impact which is more acceptable to the community. The importance given to this problem has led to the development of products alternative to quaternary ammonium salts having either equivalent performances or a lesser ecotoxicological impact.
In this respect, various patent documents which have appeared recently, can be mentioned.
For example U.S. Pat. No. 5,290,459 describes the use of partial esters of pentaerythritol or partial esters of ethoxylated oligomers of pentaerythritol to be used as such or combined with bentonites for the preparation of aqueous emulsions to be used as softening agents to be added in the rinsing phase of the washing cycle.
U.S. Pat. No. 3,928,212 on the other hand discloses the use of esters of fatty acids of polyhydric alcohols as softening agents to be used as an emulsion in the rinsing phase.
U.S. Pat. No. 4,126,562 describes the use of esters of higher fatty acids mixed with quaternary ammonium salts as softening agents with a low content of quaternary ammonium salts.
U.S. Pat. No. 4,142,978 discloses the use of esters of sorbitol as alternative softening agents to quaternary ammonium salts.
U.S. Pat. No. 4,162,984 describes the use of mixtures consisting of ammonium salts of alkyl imidazoline and esters of fatty acids (mono or dicarboxyl, alkyl or aromatic) of polyhydric alcohols.
DE-A-3,612,479 discloses the use of softening agents for the textile industry consisting of mixtures of quaternary ammonium salts and esters of polyhydric alcohols.
The state of the art described above, although on the one hand reducing the quantity of nitrogenated derivatives as softening agents for natural fibers, does not allow, on the other hand, similar performances to those of nitrogenated derivatives as such to be obtained.
In any case the compositions described in the above patents have worse performances with respect to quaternary ammonium salts.
A detergent composition with a softening and protective action of natural fibers has now been found which overcomes the disadvantages described above and at the same time has softening properties equivalent to or higher than the quaternary ammonium salts normally used for this purpose.
In accordance with this, the present invention relates to a detergent composition with a softening and protective action of natural fibers, preferably keratinous, characterized in that it has no cationic surface-active agents, and comprises:
a) surface-active agents selected from anionic, non-ionic and amphoteric surface-active agents and relative mixtures, preferably anionic;
(b) esters having general formula (I):
R
1
—CO—O—(—CH
2
—CH
2
—O—)
a
—R
2
(I)
wherein:
a is between zero and 20, preferably zero;
R
2
is a mono-functional hydrocarbon radical, preferably alkyl, having from 6 to 20, preferably from 8 to 18, carbon atoms;
R
1
is a mono-functional hydrocarbon radical containing at least one hydroxyl and a number of carbon atoms equal to or higher than two, preferably selected from:
c1) —C
6
H
n
(OH)
m
, wherein n is between 3 and 4, m is between 1 and 2, the sum of m+n being equal to 5, preferably —C
6
H
4
(OH);
c2) —CH(OH)—CH(R
3
)—COO—(—CH
2
—CH
2
—O—)
a′
, —R
4
, wherein R
3
=H or OH; a′ is between 0 and 20, and is preferably zero, and R
4
is a mono-functional hydrocarbon radical, preferably alkyl, having from 6 to 20, preferably from 8 to 18, carbon atoms;
c3) —CH(OH)—CH
3
;
the weight ratio between the surface-active agents (a) and the esters having general formula (I) ranging from 1/1 to 600/1, preferably from 1.5/1 to 400/1.
The various groups of surface-active agents (a) are well known to experts in the field.
Typical but non-limiting examples of anionic surface-active agents are alkyl sulfates, alkyl hetero sulfates, alkyl- (also called alkan-) sulfonates, alkylaryl sulfonates, alkyl carboxylates, alkylhetero carboxylates, sulfonated alpha-olefins, sulfonated internal olefins.
Typical but non-limiting examples of non-ionic surface-active agents are alkylpolyglucosides, alkylpolyethoxylates, alkylaryl polyethoxylates.
Typical but non-limiting examples of amphoteric surface-active agents are alkyl-amido propyl betaine and alkyl betaine.
With respect to R
2
and R
4
, typical examples of alcohols having the general form R
2
OH and R
4
OH are capronic alcohol, capryl alcohol, 2-ethylhexyl alcohol, caprinic alcohol, lauryl alcohol, isotridecyl alcohol, myristic alcohol, cetyl alcohol, palmitic alcohol, stearic alcohol, isostearic alcohol, oleic alcohol, linoleic alcohol, linear or branched alcohols obtained synthetically according to the oxo or modified oxo or Ziegler or Guerbet process, and the relative mixtures. Technical aliphatic alcohols have from 8 to 32 carbon atoms of a synthetic or natural derivation, are preferably used.
As far as the esters have general formula (I) are concerned, typical examples of these esters are:
tridecyl salicylate (compound having general formula (I) wherein a=0, R
2
=C
13
alkyl, R
1
=—C
6
H
4
OH);
di-(C
12
-C
13
) alkyl malate (compound having general formula (I) wherein a=0, R
2
=mixture of C
12
-C
13
alkyls, R
1
=—CH(OH)—CH
2
—COOR
2
);
di-(C
12
-C
13
)alkyl tartrate (compound having general formula (I) wherein a=0, R
2
=mixture of C
12
-C
13
alkyls; R
1
=—CH(OH)—CH(OH)—COOR
2
);
(C
12
-C
13
) alkyl lactate (compound having general formula (I) wherein a=0, R
2
=C
12
-C
13
; R
1
=—CH(OH)—CH
3
); The esters having general formula (I) can be prepared according to techniques well known to experts in the field. In particular they can be prepared by the esterification of fatty alcohols or fatty alcohols ethoxylated with the corresponding hydroxyacids.
The composition of the present invention can be used in various formulations with different applications.
A first application is in domestic detergents. In this case the detergent formulation with a softening effect (formulation A) comprises surface-active agents (a) and esters having general formula (I), the ratio between the two being from 200/1 to 5/1, preferably from 100/1 to 10/1. The surface-active agents which can be used in the above composition can be selected from sulfate alcohols, ethoxysulfate alcohols, sulfonated alkylbenzene, ethoxylated alcohols, ethoxylated alkylaryl, amphoteric surface-active agents (betaine) and/or alkylpolyglucosides (APG), sulfonated internal olefins, sulfonated alpha-olefins. In the above formulation A, the concentration of surface-active agents can vary from 10 to 40% by weight, the complement to 100, regardless of the esters of the present invention, consisting of water and minor components such as antifoaming agents, perfumes and preservatives, usually used in commercial formulations.
A second application is as a softening agent in the rinsing phase. In this case the formulation (formulation B) has a ratio between surface-active agents (a) and esters having general formula (I) ran
Buosi Francesco
Genova Calogero
Giammasi Giuseppe
Condea Augusta S.P.A.
Douyon Lorna M.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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