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Sommaire du brevet 1211674 

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(12) Brevet: (11) CA 1211674
(21) Numéro de la demande: 436444
(54) Titre français: PRODUIT POUR LE DECRASSAGE DES FOURS MENAGERS
(54) Titre anglais: OVEN CLEANER
Statut: Octroyé
Données bibliographiques
Abrégés

Abrégé anglais


-1-
ABSTRACT
An oven cleaner containing as the active ingredients a
non-caustic alkali metal carbonate, sesquicarbonate or
bicarbonate and a polyhydric alcohol, preferably glycerol,
which is liquid and substantially non-volatile at the desired
cleaning temperature and in which the alkali metal salt is
soluble at that temperature..
A method for cleaning ovens and cookware comprises
applying the oven cleaner according to the invention to the
surface to be cleaned and heating the surface to a
temperature of at least 125°C for a period of at least five
minutes and wiping and/or washing the saponified oils and
fats from the surfaces.
Effective oven cleaning compositions having a pH of 9 or
below may be produced using the present invention.

Revendications

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


- 14 -

The embodiments of the invention in which an exclusive
property or privilege is claimed are defined as follows:

1. An oven cleaner comprising an effective amount of a
polyhydric alcohol which is a liquid and substantially
non-volatile at a desired cleaning temperature of at least
125°C and an alkali metal salt soluble therein at said
temperature, characterised in that the alkali metal salt is
the essential active ingredient in the cleaner, and is
non caustic and selected from an alkali metal carbonate or
bicarbonate or sesquicarbonate, or mixture thereof, in an
amount of at least 2% by weight of the cleaner.

2. An oven cleaner as claimed in claim 1 in which the
polyhydric alcohol has the general formula:-
CH2OH(CHOH)nCH2OH
wherein n = 0, 1, 2, 3 or 4.

3. An oven cleaner as claimed in claim 1 in which the
alkali metal salt is a potassium salt and in which the
polyhydric alcohol is selected from the group comprising
propylene glycol, diethylene glycol, polyethylene glycol,
dipropylene glycol, polypropylene glycol, triethylene glycol
and 1, 2, 6 hexanetriol.

4. An oven cleaner as claimed in claim 1 in which the oven
cleaner contains at least 35% by weight of water.

5. An oven cleaner as claimed in claim 1 in which the
desired cleaning temperature is between 125 and 250°C.

6. An oven cleaner as claimed in claim 1 in which the
alkali metal salt is present in an amount of from 2% to 20% by
weight of the oven cleaner.

7. An oven cleaner as claimed in claim 1 in which the
alkali metal salt is a sodium or potassium salt.


-15-
8. An oven cleaner as claimed in claim 1 in which the
polyhydric alcohol is present in an amount of from 1 to 50% by
weight of the oven cleaner.

9. An oven cleaner as claimed in claim 1 in which the
polyhydric alcohol is glycerol.

10. An oven cleaner as claimed in claim 1 in which the oven
cleaner has a pH of less than 11.

11. An oven cleaner as claimed in claim 10 in which the oven
cleaner has a pH of less than 10.

12. An oven cleaner as claimed in claim 11 in which the oven
cleaner has a pH of 9 or less.

13. An oven cleaner as claimed in claim 1 in which the oven
cleaner additionally contains a surfactant, a fragrance, a
pigment marker, a propellant, a thickener, or a mixture of two
or more of these ingredients.

14. A method for cleaning a cooking surface carrying baked
on fats or greases, comprising applying an oven cleaner as
claimed in claim 1 to the cooking surface, heating the cooking
surface to at least 125°C for a period of at least 5 minutes
and removing the saponified fats or greases from the cooking
surfaces.

15. A method as claimed in claim 14, in which the removing
of the saponified fats or greases includes washing the same.

16. A method as claimed in claim 14, in which the removing
of the saponified fats or greases includes wiping the same.

17. A method as claimed in claim 14, in which the removing
of the saponified fats or greases includes washing and wiping
the same.

Description

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


~ 2 ~ lZ11674
The present invention relates to an improved oven
cleaner and to a method for removing baked on fats and
greases from cooking surfaces.
Oven cleaners are compositions of matter used to remove
baked on fats and greases from cooking surfaces. Such
compositions are commonly used for cleaning ovens as the name
implies but may also be used to clean other cooking surfaces
on which there has been a build up of baked on fats and
greases. Such surfaces include fry pans, kitchenware,
barbecue equipment, cooking utensils and the like. These
surfaces may be of bare metal, metal coated as with baked
enamel, glazed stoneware, porcelain, glass or the like.
Conventional oven cleaners are based on caustic soda.
It has generally been considered necessary to use a caustic
alkali in order to efectively saponify the fats in the baked
on material in order to enable its removal. A ~ew oven
cleaners have been based on solvents, acetate salts, amines
or ammonia. The known caustic based systems suffer from the
disadvantage o~ being quite hazardous and/or require the
consumer to wear gloves during usage. These known
caustic-based systems are required to carry poisons schedule
labelling and warning statements. The systems based on
acetate salts have the disadvantage that they require
temperatures of 250C or above to activate them.
It has been proposed in the past to individually add
organic solvents and inorganic builder salts to oven cleaning
compositions based on alkali or nitrogen containing active
cleaning ingredients. Such additions are for instance
disclosed in U.S. Patent Specifications 3,829,387; 3,813,343;
and 3,658,711. It has also been known to use aqueous
solutions of alkali metal salts to form non-stick coatings on
ovens; see U.K. Patent Specifications 2,019,876 and
1,523,491 and Australian Patent Specification 453,537. It
has not previously been proposed, however, to use the two
abovementioned types of ingredients together. It has also




.. _ .. . ..

~Z11674
-- 3

not been previously recognised that these two types of
ingredients, which each has only a mild cleaning action on
its own, can be combined together to provide a highly
e~fective oven cleaner while avoiding many of the
disadvantages of the known oven cleaners.
The present invention consists in an oven cleaner
containing as acti.ve ingredients an effective amount of an
alkali metal bicarbonate, sesquicarbonate or carbonate or a
mixture thereof and a polyhydric alcohol which is liquid and
substantially non-volatile at the desired cleaning
temperature and in which the alkali metal salt is soluble at
that temperature.
The present invention further consists in applying the
oven cleaner according to this invention to a cooking surface
carrying baked on fats or g;reases, heating the cooking
surface to at least 125C, and preferably from 125 to
250C, for a period of at least five minutes and washing
andJor wiping the saponified fats or greases from the cooking
surface.
The oven cleaner according tG the present invention may
have a pH as low as 9 or less which allows its use without
rubber gloves and like protective clothing. These oven
cleaners also have the advantage that surfaces of stainless
steel, aluminium, and some other metals will be left with a
shiny surface after cleaning rather than being left with a
dull, oxidised, surface as is the case with many of the prior
art oven cleaning compositions.
The non-caustic alkali metal salt is most preferably
sodium or potassium bicarbonate. Other alkali metal salts
which can be advantageously used include sodium or potassium
sesquicarbonate, and sodium or potassium carbonate. The
alkaline salt preferably comprise from 0.5 to 20% by weight
of the product and most preferably 2 to 20% by weight.
The pH of the product is preferably below 11 and more
preferably below 10 and most preferably 9 or below.

~ 4 - lZ116 ~4

The po]yhydric alcohol used in the present invention
preferably have the general formula:
CH20H (CHO~) n CH2O~ where n = 0, 1, 2, 3 or 4.
The liq~id is most preferably glycerol or includes glycerol.
Other compounds in this group which may be used include
mannitol, ethylene glycol and sorbitol. When the salt is a
potassium salt the polyhydric alcohol ma~ with equal
effectiveness be an alcohol falling outside the above general
formula. This is blelieved to be due to the higher solubility
of the potassium salts in the polyols as compared with the
corresponding sodium salt. Plolyhydric alcohols which work
efficiently ~ith the potassium salts include various grades
of propylene glycol, diethylene glycol, polyeth~lene glycol,
dipropylene glycol, polypropylene glycol, triethylene glycol,
and 1,2,6 hexanetriol. The p~olyhydric alcohol preferably
comprises from 1 to 50% by weight of the product.
The oven cleaner according to this invention preferably
includes water. The water is preferably present in an amount
of at least 35% by weight.
The oven cleaner is preferably water based and
preferably contains a thickener to prevent it running off
vertical surfaces. Other ingredients may include a
surfactant or soap, a fragrance, a pigment marker and a
propellant.
The oven cleaner according to this invention may be
applied in any suitable manner. These include an aerosol, a
trigger or pump spray, a brush or pad.
In carrying out the method according to this invention
the oven cleaner is preferably applied to a surface to be
cleaned and heated to a temperature of from 125C to
250C for a time of from 5 minutes to 2 hours.
It is believed that oven cleaners according to this
invention are effective, despite their limited alkalinity and
the evaporation of the water from the cleaner, due to the
continued action of the alkaline salt dissolved in the

_ 5 _ ~ 21 1 6'~4

non-volatile polyhydric alcohol. The alkaline salt is
maintained in a condition in which it is available for
reaction with the baked on fats and greases at the required
elevated temperature by being dissolved in the polyhydric
alcohol. For this reason the polyhydric alcohol is required
to be substantially non-volatile at the cleaning temperature.
Hereinafter given by way of example are preferred
embod~ments of t;he present invention.
Test surfaces were prepared by baking smeared dripping
onto white vitreous enamel metal plates for 1 1/2 hours at
250 C. The baked-on dripping could not be removed at all
by washing or wiping without a scourer.
Cleaners consisting of the formulations given below were
applied to the test surfaces to be cleaned from a trigger
pack after shaking well.
The test plates were then heated in an oven for 30
minute~ to a final temperature of 150C~
The test plates were then either rinsed under a fast
running tap or wiped with a damp sponge and the percentage
removal of baked-on dripping recorded.
Example 1 ~ w/w
Sodium Bicarbonate 6.3
Glycerol 20.0
Sodium Dodecyl Benzene Sulphonate 1.0
25 Veegum T~ 1.5
Xanthan Gum 0.05
Titanium Dioxide 0~5
Water to 100
Product pH 8.4
30 ~ Removal of soil 100

Example 2 ~ w/w
Potassium Bicarbonate 7.5
Glycerol 20.0
35 Sodium Dodecyl Benzene Sulphonate 1.0

6 - ~1211~i'74

Veegum T~D I . 5
Xanthan G~m O . 05
Titanium Diox ide O . 5
Water to lO0

5 Product pH 8.4
~ Removal of soil lO0

Example 3 % w/w
Soda Ash (Sodium rarbonate) 4.0
Glycerol 20O0
lO Sodium Dodecyl Benzene Sulphonate l.0
Veegum T~ 1.5
Xanthan Gum o.i~5
Titanium Dioxide 0.5
Water to lO0

15 Product pH 11.25
~ Removal of soil 100

Example 4 ~ w/w
Sodium Sesquicarbonate 5.65
Glycerol 20.0
20 Sodium Dodecyl Benzene Sulphonate l.0
Veegum T~ 1.5
Xanthan ~um o~o5
Titanium Dioxide 0.5
Water to 100

25 Product pH 10.1
% Removal of soil lO0

Example 5 % w/w
, Sodium Bicarbonate 3.15
j Potassium Bicarbonate 3.75




~'
~ ~.

~X11S~'7~

-- 7 --

Glycerol 20.0
Sodium Dodecyl Benzene Sulphonate 1.0
Veegum T~ 1.5
Xanthan Gum 0.05
5 Titanium Dioxide 0.5
Water to 100

Product pH 8.4
% Removal of soil 100

Note: Use of the bicarbonate mixture gave no improvement
in performance at lower temperatures or shorter
heating time intervals.
Example 6 % w/w




Sodium Bicarbonate 6.3
Sorbitol (70%) 20.0
15 Sodium Dodecyl Benzene Sulphonate 1.0
Veegum T~ 1.5
Xanthan Gum 0.05
Titanium Dioxide 0.5
Water to 100

20 Product pH ~.4
~ Removal of soil 95

Example 7 % w/w
Sodium Bicarbonate 6.3
Ethylene Glycol 20.0
25 Sodium Dodecyl Benzene Sulphonate 1.0
Veegum T~ 1.5
Xanthan Gum 0.05
Titanium Dioxide `0.5
Water to 100

30 Product pH 8.4




~ ~

~IZ~ ;'7~
8 -

Removal of soil 80

Example 8 ~ w/w
Sodium Bicarbonate 6.3
Mannitol 20.0
5 Sodium Dodecyl Benzene Sulphonate 1.0
Veegum T~ 1.5
Xanthan Gum 0 5
Titanium Dioxide o. 5
Water to 100

10 Product pH 8.4
% Removal of soil 92

Example 9 % w/w
Sodium Bicarbonate 6.3
Ethylene Glycol 8.3
15 Sorbitol (70%~ 11.7
Sodium Dodecyl Benzene Sulphonate 1.0
Veegum T~ 1~5
Xanthan Gum o.
Titanium Dioxide 0.5
20 Water to 100

Product pH 8.4
% Removal of soil 93

Note: Mixture of ethylene glycol and sorbitol matches
glycerol with respect to average chain length.
Example 10
A cleaner consisting of the following formulation was
applied to a test surface to be cleaned, prepared as for
Examples 1-9, from an aerosol pack after shaking well. The
test was then carried out in the same manner as for Examples
1-9.




.

~2116~4
g

~ W/W
Sodium 8icarbonate 5.~7
Glycerol 18.0
Gafteric MD 0 . 036
5 Veegum T~ 1. 35
Xanthan Gum 0.045
Titanium Dioxide 0.45
Deionised Water 64.45
Propellant P12/114:60/40 10.0

10 Product pH 8.4
~ Removal of soil 99

Example 11
A cleaner consisting of the following formulation was
brushed onto a test surface to be cleaned, prepared as for
Examples 1-9. The test was then carried out in the same
m~nner as for Examples 1-9.
% w/w
Sodium Bicarbonate 24.0
Glycerol 76.0

20 % Removal of soil 100

Example 12 % w/w
Potassium Bicarbonate 7.5
Diethylene GLycol 20.0
Sodium Dodecyl Benzene Sulphonate 1.0
25 Veegum T~ 1.5
Xanthan Gum 0.05
Titanium Dioxide 0.5
; Water to 100

Product pH 8.4
30 % Removal of soil 100




`A

Zl~
-- 10 -

Example 13 ~ w~w
Potassium Bicarbonate 7.5
Triethylene Glycol 20.0
Sodium Dodecyl Benzene Sulphonate 1.0
5 Veegum T~ 1.5
Xanthan Gum 0.05
Titanium Dioxide 0.5
Water to 100

Product pH 8.4
10 % Removal of soil 100

Example 14 % w/w
-




Potassium Bicarbonate 7.5
Propylene Glycol 20.0
Sodium Dodecyl Benzene Sulphonate 1.0
15 Veegum T~ 1.5
Xanthan Gum 0.05
Titanium Dioxide 0.5
Water to 100

Product pH 8.4
20 ~ Removal of soil 100

Example 15 % w/w
Potassium Bicarbonate 7.5
1,2,6 Hexanetriol 20.0
Sodium Dodecyl Benzene Sulphonate 1.0
25 Veegum T~ 1.5
Xanthan Gum 0.05
Titanium Dioxid~ 0.5
Water to 100

Product pH 8~4




~ ?~, ~

L?~

% Removal of soil 100

Example 16 % w/w
Potassium ~icarbonate 7.5
Dipropylene Glycol 20.0
5 Sodium Dodecyl Benzene Sulphonate 1.0
Veegum T~ 1.5
Xanthan Gum 0.05
Titanium Dioxide 0.5
Water to 100

10 Product pH 8.4
~ Removal of soil 95

Example 17 ~ w/w
Potassium Bicarbonate 7.5
Polypropylene Glycol 15020.0
15 Sodium Dodecyl Benzene Sulphonate 1.0
Veegum T~ 1.5
Xanthan Gum 0.05
Titanium Dioxide 0.5
Water to 100

20 Product pH 8.4
% Removal of soil 95

Example 18 % w/w
Potassium Bicarbonate 7.5
Polyethylene Glycol 200 20.0
25 Sodium Dodecyl Benzene Sulphonate 1.0
Veegum T~ 1.5
Xanthan Gum 0.05
Titanium Dioxide 0.5
Water to 100

1 2 ~2~ 74

Product pH 8.4
96 Removal of soil 95

Example 19 ~ w/w
Potassium Bicarbonate 7.5
Polyethylene Glycol 300 20.0
Sodium Dodecyl Benzene Sulphonate 1.0
Veegum T~ 1.5
Xanthan Gum O.o5
Titanium Dioxide 0.5
10 Water to 100

Product pH 8.4
% Removal of soil 90

Example 20 % w/w
Potassium Bicarbonate 7.5
15 Polyethylene Glycol 600 20.0
Sodium Dodecyl Benzene Sulphonate 1.0
Veegum T~ 1.5
Xanthan Gum 0.05
Titanium Dioxide 0.5
20 Water to 100

Product pH 8.4
Removal of soil 90

The performance of the composition according to
Examples, ~or instance, 1 to 5 was equal to that of a molar
equivalent active level of caustic soda in the same
formulation base.
Caustic soda based products on the market when tested
under identical conditions removed only 80-95% of the
baked-on dripping.
A synergistic effect between the polyhydric alcohol(s)




A

lZ1~6'74
- 13 -

and the non-caustic alkali metal salt(s) has been
demonstrated by testing glycerol and sodium bicarbonate
separately alongside a mixture of both on the same prepared
test plate.
.5 Sodium bicarbonate on its own removed onIy 50% of the
baked-on dripping and glyce.rol on its own removed only 30% of
the baked-on dripping where,as the mixture of sodium
bicarbonate and glycerol removed 100% of the baked-on
dripping.

Dessin représentatif

Désolé, le dessin représentatatif concernant le document de brevet no 1211674 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 1986-09-23
(22) Dépôt 1983-09-12
(45) Délivré 1986-09-23
Expiré 2003-09-23

Historique d'abandonnement

Il n'y a pas d'historique d'abandonnement

Historique des paiements

Type de taxes Anniversaire Échéance Montant payé Date payée
Le dépôt d'une demande de brevet 0,00 $ 1983-09-12
Titulaires au dossier

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

Titulaires actuels au dossier
R&C PRODUCTS PTY. LIMITED
Titulaires antérieures au dossier
S.O.
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) 
Dessins 1993-07-07 1 8
Revendications 1993-07-07 2 72
Abrégé 1993-07-07 1 19
Page couverture 1993-07-07 1 12
Description 1993-07-07 12 307
Cession 2003-08-28 12 374
Correspondance 2003-09-24 1 2
Cession 2003-10-31 1 26