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Sommaire du brevet 2347430 

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L'apparition de différences dans le texte et l'image des Revendications et de l'Abrégé dépend du moment auquel le document est publié. Les textes des Revendications et de l'Abrégé sont affichés :

  • lorsque la demande peut être examinée par le public;
  • lorsque le brevet est émis (délivrance).
(12) Demande de brevet: (11) CA 2347430
(54) Titre français: COMPOSITION DE BLANCHIMENT LIQUIDE EPAISSIE A BASE DE PEROXYDE D'AZOTE
(54) Titre anglais: THICKENED LIQUID HYDROGEN PEROXIDE BLEACH COMPOSITIONS
Statut: Morte
Données bibliographiques
(51) Classification internationale des brevets (CIB):
  • C11D 3/395 (2006.01)
  • C11D 1/75 (2006.01)
  • C11D 3/02 (2006.01)
  • C11D 3/12 (2006.01)
  • C11D 3/20 (2006.01)
  • C11D 3/36 (2006.01)
  • C11D 3/39 (2006.01)
  • C11D 10/04 (2006.01)
(72) Inventeurs :
  • MERCADO, HEDELIZA MALONZO (Canada)
(73) Titulaires :
  • COLGATE-PALMOLIVE COMPANY (Etats-Unis d'Amérique)
(71) Demandeurs :
  • COLGATE-PALMOLIVE COMPANY (Etats-Unis d'Amérique)
(74) Agent: SMART & BIGGAR
(74) Co-agent:
(45) Délivré:
(86) Date de dépôt PCT: 1999-10-21
(87) Mise à la disponibilité du public: 2000-04-27
Requête d'examen: 2004-09-20
Licence disponible: S.O.
(25) Langue des documents déposés: Anglais

Traité de coopération en matière de brevets (PCT): Oui
(86) Numéro de la demande PCT: PCT/US1999/024910
(87) Numéro de publication internationale PCT: WO2000/023555
(85) Entrée nationale: 2001-04-17

(30) Données de priorité de la demande:
Numéro de la demande Pays / territoire Date
09/177,688 Etats-Unis d'Amérique 1998-10-22

Abrégés

Abrégé français

Cette invention a trait à une composition de blanchiment liquide épaissie comprenant du peroxyde d'azote, un mélange tensioactif comprenant de l'oxyde de diméthylamine d'alkyle et un savon formé par la neutralisation d'un acide gras portant 6 à 18 atomes de carbone avec un hydroxyde de métal alcalin, un électrolyte comprenant un sulfate de métal alcalin, un agent de stabilisation du peroxyde d'azote à base de phosphonate et un hydroxyde de métal alcalin sous une quantité suffisante pour neutraliser in situ l'acide gras portant 6 à 18 atomes de carbone afin de former la savon et de donner à la composition un pH compris entre 8 et 9,5.


Abrégé anglais




A thickened liquid bleaching composition is provided comprising hydrogen
peroxide; a surfactant mixture comprising alkyl dimethylamine oxide and soap
formed by the neutralization of a C6-C18 fatty acid with an alkali metal
hydroxide; an electrolyte comprising an alkyl metal sulfate; a phosphonate
stabilizer for hydrogen peroxide; and alkali metal hydroxide in an amount
sufficient to effect in-situ neutralization of the C6-C18 fatty acid to form
the soap and also provide a pH in the range of from about 8 to 9.5.

Revendications

Note : Les revendications sont présentées dans la langue officielle dans laquelle elles ont été soumises.



Claims
What is claimed is:

1. An alkaline thickened liquid bleaching composition comprising, by weight:
(a) from about 0.1% to about 10% of hydrogen peroxide;
(b) from about 1.5% to about 8% of a surfactant mixture comprising
(i) alkyl dimethylamine oxide; and
(ii) soap formed by the in-situ neutralization of a C6-C18 fatty acid with an
alkali metal hydroxide; the weight ratio of (i) and (ii) being from about
1.5:1 to about 6:1;
(c) from about 0.5% to about 5% of an electrolyte comprising an alkali metal
sulfate;
(d) from about 0.4% to about 1% of a phosphonate stabilizer for the hydrogen
peroxide;
(e) an alkali metal hydroxide in an amount sufficient to effect the in-situ
neutralization of the aforesaid C6-C18 fatty acid to form the soap defined in
(b)
(ii), and also provide a pH in the range of from about 8 to about 9.5 for the
thickened bleaching composition;
(f) from about 0% to about 2% of sodium benzoate; and
(g) balance water.

2. An alkaline thickened bleaching composition as in claim 1 wherein the
amount of
hydrogen peroxide is from about 2% to about 6%.

3. An alkaline thickened bleaching composition as in claim 1 wherein the
amount of
said surfactant mixture is from about 2% to about 4%, by weight, of the
composition, and the
ratio of (i) to (ii) is from about 2:1 to about 4:1.

4. An alkaline thickened bleaching composition as in claim 1 where the alkyl
group in
the alkyl dimethylamineoxide is comprised of a mixture of carbon chain lengths
consisting
essentially of from 33% to 43% of C12; from 42% to 52% of C14; and from 4% to
14% of C16.

5. An alkaline thickened bleaching composition as in claim 4 wherein the amine
oxide
surfactant is lauryl dimethyl amine oxide.

6. An alkaline thickened bleaching composition as in claim 1 wherein the soap
is a
coco lauryl soap formed by the neutralization of coco fatty acid with said
alkali metal
hydroxide.

5



7. An alkaline thickened bleaching composition as in claim 1 wherein said
electrolyte is
sodium or potassium sulfate.

8. An alkaline thickened bleaching composition as in claim 1 wherein said
phosphonate
stabilizer is the pentasodium salt of diethylenetriamine penta (methylene
phosphonic acid).

9. An alkaline thickened bleaching composition as in claim 1 wherein the pH of
the
composition is from about 8.2 to about 9.2.

10. An alkaline thickened bleaching composition as in claim 1 which contains
sodium
benzoate in an amount of from about 0.2% to about 1.5% by weight.

11. An alkaline thickened bleaching composition as in claim1 which is
characterized by
being substantially free of an electrolyte other than that defined in (c).

12. A method of bleaching fabrics comprising the step of contacting the
fabrics to be
bleached with an effective amount of the alkaline thickened liquid bleaching
composition
defined in claim 1.

13. A method as in claim 12 wherein the soap is a coco lauryl soap formed by
the
neutralization of coco fatty acid with said alkali metal hydroxide.


6

Description

Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.



CA 02347430 2001-04-17
WO 00/23555 PCT/US99/24910
Thickened Liauid Hydrogen Perozide
Bleach Compositions
This invention relates to alkaline thickened liquid hydrogen peroxide
bleaching
compositions. More particularly, this invention relates to such alkaline
thickened bleaching
compositions which are highly stable in terms of providing a uniform and
thickened viscosity
which remains stable over time, concomitant with the ability to maintain a
stable bleaching
activity during extended periods of storage prior to use by the consumer.
Hydrogen peroxide compositions have been the focus of much attention in the
patent
literature in recent years as replacements for or as alternatives to halogen-
containing bleaches,
often motivated by environmental considerations. In particular, interest has
focused on
alkaline hydrogen peroxide bleaches because of their greater reactivity and
enhanced bleaching
efficacy as compared to acidic hydrogen peroxide compositions.
One of the prime requirements of a bleach intended for domestic use is that
the
bleaching species remain sufficiently stable to insure good efficacy of the
bleach product upon
use by the consumer, typically many months after the products manufacture.
Hydrogen
peroxide solutions are known to provide enhanced bleaching efficacy when used
under alkaline
conditions. However, stabilization of hydrogen peroxide is particularly
troublesome at such
alkaline conditions.
Further, the problem of bleach stability is often exacerbated when formulating
a
thickened bleach product. Thickening of a pourable liquid bleach is intended
to provide an
enhanced aesthetic appearance of the product as well as assist the consumer to
control
dispensing of the liquid bleach product. A thickened composition also serves
to limit the rate
at which the composition flows or drains from the surfaces to which it is
applied. However,
the use of a thickening agent or thickening system in the bleach composition
presents problems
in formulation: it is often incompatible with peroxide bleach stabilizers
which are otherwise
effective in non-thickened compositions, or the thickening agents themselves
may provide an
uneven viscosity to the liquid bleach product and, in general, adversely
affect product
appearance and flow characteristics depending on variables such as product pH
or the non-
bleach ingredients, such as electrolyte, present in the composition.
EP 376 704 describes hydrogen peroxide aqueous solutions which contain a
combination of surfactant and electrolyte to provide thickening and bleach
stability.


CA 02347430 2001-04-17
WO 00/23555 PCT/US99/24910
UK patent application GB 2 273 721 describes a thickened bleach composition
which
comprises an alkaline aqueous solution of hydrogen peroxide containing as the
thickening
system a mixture of a quaternary long chain alkyl ammonium compound together
with a salt of
an aromatic sulphonic acid hydrotrope.
U.S. Patent 5,736,498 is concerned with alkaline hydrogen peroxide
compositions
which are thickened with a polymeric thickener having a polyethylene backbone.
U.S. Patent 4,900,469 describes a thickened laundry composition comprising a
surfactant thickening system, a hydrogen peroxide bleach and a stabilizing
system consisting of
a chelating agent and an antioxidant. A C6-C~g soap is optionally included to
increase
viscosity.
Notwithstanding the above-mentioned patent literature and the availability of
numerous
commercial thickeners intended for liquid compositions, there remains a need
in the art for a
thickened alkaline liquid bleach composition containing a hydrogen peroxide
bleach which is
capable of providing long-term bleaching efficacy, and which also contains an
effective,
environmentally safe and economical thickening system which does not adversely
affect the
bleaching performance and stability of hydrogen peroxide.
Summary of the Invention
The present invention provides an alkaline thickened liquid bleaching
composition
comprising, by weight:
(a) from about 0.1 % to about 10% of hydrogen peroxide;
(b) from about 1.5% to about 8% of a surfactant mixture comprising
(i) alkyl dimethylamine oxide; and
(ii) soap formed by the in-situ neutralization of a C6-C~g fatty acid with an
alkali metal hydroxide; the weight ratio of (i) and (ii) being from about
1.5:1 to about 6:1;
(c) from about 0.5% to about 5% of an electrolyte comprising an alkali metal
sulfate;
(d) from about 0.4% to about 1% of a phosphonate stabilizer for the hydrogen
peroxide;
(e) an alkali metal hydroxide in an amount sufficient to effect the in-situ
neutralization of the aforesaid C6-C,g fatty acid to form the soap defined in
(b)
(ii), and also provide a pH in the range of from about 8 to about 9.5 for the
thickened bleaching composition;
2


CA 02347430 2001-04-17
WO 00/23555 PCT/US99124910
(f) from about 0% to about 2% of sodium benzoate; and
(g) balance water.
In accordance with the method aspect of the invention there is provided a
method of
bleaching fabrics comprising the step of contacting the fabrics to be bleached
with an ei~ective
amount of the above-described alkaline thickened liquid bleaching composition.
The present invention is predicated on the discovery that thickening of a
hydrogen
peroxide bleach solution can be effectively provided with a surfactant mixture
of alkyl
dimethylamine oxide and soap as herein described in combination with a weak
electrolyte such
as an alkali metal sulfate, such that a stable commercially desirable
viscosity in the range of
from about 80 to 500 cps can be readily achieved, preferably from about 100 to
300 cps,
without adversely affecting the stability of the peroxide bleach.
Detailed Description of the Invention
The amount of hydrogen peroxide bleach present in the composition of the
invention
may vary from about 0.1% to about 10%, by weight, of the total composition.
Preferred
compositions comprise from about 2% to about 6%, by weight.
The surfactant mixture which forms part of the thickening system is comprised
of an
alkyl dimethylamine oxide and a neutralized C6-C1g fatty acid, such mixture
being present in an
amount of from about 1.5 to 8%, by weight, preferably from about 2% to 4%, by
weight. The
alkyl group in the dimethylamine oxide surfactant contains from about 11 to 16
carbon atoms.
A preferred alkyl group is comprised of a mixture of carbon chain lengths
comprising 33% to
43% of C12; from 42% to 52% of C14; and from 4% to 14% of C16. Lauryl is a
particularly
preferred alkyl group.
The second component of the surfactant mixture is a C6-C~8 fatty acid which is
neutralized in-situ by the alkali metal hydroxide in the liquid composition to
form a C6-C,g
soap. Typical fatty acids include capric acid, lauric acid, any myristic acid,
but most preferred
is coconut fatty acid which after neutralization forms the coconut lauryl
soap.
The ratio of the described amine oxide surfactant to the fatty acid soap is
generally
from about 1.5:1 to about 6:1, and preferably from about 2:1 to about 4:1.
The third component of the thickening system which serves to stabilize the
increased
viscosity provided by the surfactant mixture is an alkali metal sulfate such
as sodium or
potassium or magnesium sulfate. Sodium sulfate is preferred as a source of
weak electrolyte
which serves to stabilize the viscosity of the composition without adversely
affecting the
3


CA 02347430 2001-04-17
WO 00/23555 PCT/US99/24910
stability of the hydrogen peroxide in solution. It has been found that the
presence of strong
electrolyte in solution at a level to compliment the surfactant thickening
such as Na2C03,
NaOH, NaHC03 cause decomposition of alkaline hydrogen peroxide solution and
is, therefore,
to be avoided in the present liquid bleaching compositions.
The peroxide bleach stabilizer used herein is a polyphosphonate sequestrant.
Examples
of suitable phosphonate stabilizers include sodium or potassium salts of HEDP'
and EDTMP2.
Most preferred is the pentasodium salt of diethylenetriamine penta (methylene
phosphoric
acid), which is available commercially under the trademark bequest 2066 from
the Monsanto
Company.
An essential ingredient in the present bleaching composition is an alkali
metal hydroxide
such as sodium or potassium hydroxide, in an amount sufficient to neutralize
in-situ the fatty
acid ingredient present in the surfactant mixture so as to form the soap. The
alkali metal
hydroxide also serves to provide an alkaline pH in the liquid bleach
composition of from 8 to
9.5, and preferably from 8.2 to 9.2. The amount of alkali metal hydroxide in
the composition
is generally from about 0.10 to 0.5%.
The liquid bleach compositions may preferably include a pH buffer such as
sodium
benzoate which serves to stabilize the pH of the composition and thereby
assists in stabilizing
the peroxide bleach.
Other materials, such as colorants, perfumes, germicides may also be added in
minor
amounts, if desired.
' HEDP= 1,1,1-hydroxyethylenediphosphonic acid
2 EDTMP = ethylene diamine tetramethylenephosphonic acid
4

Dessin représentatif

Désolé, le dessin représentatatif concernant le document de brevet no 2347430 est introuvable.

États administratifs

Pour une meilleure compréhension de l'état de la demande ou brevet qui figure sur cette page, la rubrique Mise en garde , et les descriptions de Brevet , États administratifs , Taxes périodiques et Historique des paiements devraient être consultées.

États administratifs

Titre Date
Date de délivrance prévu Non disponible
(86) Date de dépôt PCT 1999-10-21
(87) Date de publication PCT 2000-04-27
(85) Entrée nationale 2001-04-17
Requête d'examen 2004-09-20
Demande morte 2006-10-23

Historique d'abandonnement

Date d'abandonnement Raison Reinstatement Date
2005-10-21 Taxe périodique sur la demande impayée

Historique des paiements

Type de taxes Anniversaire Échéance Montant payé Date payée
Le dépôt d'une demande de brevet 300,00 $ 2001-04-17
Enregistrement de documents 100,00 $ 2001-08-13
Taxe de maintien en état - Demande - nouvelle loi 2 2001-10-22 100,00 $ 2001-09-17
Taxe de maintien en état - Demande - nouvelle loi 3 2002-10-21 100,00 $ 2002-09-16
Taxe de maintien en état - Demande - nouvelle loi 4 2003-10-21 100,00 $ 2003-09-15
Taxe de maintien en état - Demande - nouvelle loi 5 2004-10-21 200,00 $ 2004-09-16
Requête d'examen 800,00 $ 2004-09-20
Titulaires au dossier

Les titulaires actuels et antérieures au dossier sont affichés en ordre alphabétique.

Titulaires actuels au dossier
COLGATE-PALMOLIVE COMPANY
Titulaires antérieures au dossier
MERCADO, HEDELIZA MALONZO
Les propriétaires antérieurs qui ne figurent pas dans la liste des « Propriétaires au dossier » apparaîtront dans d'autres documents au dossier.
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Description du
Document 
Date
(yyyy-mm-dd) 
Nombre de pages   Taille de l'image (Ko) 
Abrégé 2001-04-17 1 46
Description 2001-04-17 4 221
Revendications 2001-04-17 2 75
Page couverture 2001-07-12 1 30
Correspondance 2001-06-21 1 24
Cession 2001-04-17 2 86
PCT 2001-04-17 12 445
Cession 2001-08-13 4 187
PCT 2001-07-16 1 65
Poursuite-Amendment 2004-09-20 1 39