U.S. patent number 3,928,065 [Application Number 05/426,399] was granted by the patent office on 1975-12-23 for composition for cleaning metal cookware.
This patent grant is currently assigned to Lever Brothers Company. Invention is credited to Richard Savino.
United States Patent |
3,928,065 |
Savino |
December 23, 1975 |
Composition for cleaning metal cookware
Abstract
Baked-on, hardened, or carbonized food debris may be easily
removed from metal cookware by contacting the debris with a mixture
of kaolin and a solvent which is N-methyl-2-pyrrolidone,
N-ethyl-2-pyrrolidone, N-isopropyl-2-pyrrolidone, or
2-amino-2-methyl-1-propanol, or mixtures thereof, followed by
soaking in hot water, and rinsing. The mixture of kaolin and
solvent is also useful as a hand cleaner.
Inventors: |
Savino; Richard (Park Ridge,
NJ) |
Assignee: |
Lever Brothers Company (New
York, NY)
|
Family
ID: |
23690654 |
Appl.
No.: |
05/426,399 |
Filed: |
December 19, 1973 |
Current U.S.
Class: |
134/7; 134/2;
134/39; 134/30; 134/40; 510/138; 510/507; 510/197; 510/237;
510/499; 510/500; 510/218; 510/235 |
Current CPC
Class: |
C11D
3/126 (20130101); C11D 3/0057 (20130101); C11D
7/5013 (20130101); C11D 7/3281 (20130101); C11D
7/3218 (20130101) |
Current International
Class: |
C11D
3/12 (20060101); C11D 3/00 (20060101); C11D
7/50 (20060101); C11D 7/22 (20060101); C11D
7/32 (20060101); B08B 003/08 (); B08B 007/04 ();
C11D 007/20 (); C11D 007/50 () |
Field of
Search: |
;252/524,139,542,153,154,155,162,163,259.5,529
;134/39,40,2,7,30 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Talbert, Jr.; Dennis E.
Assistant Examiner: Albrecht; Dennis L.
Attorney, Agent or Firm: Farrell, Esq.; James J.
Claims
What is claimed is:
1. A detergent composition in fine particulate form suitable for
use in removing adhering carbonized food debris from metal surfaces
comprising in admixture:
i. one part by weight of a solvent selected from the group
consisting of N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone,
N-isopropyl-2-pyrrolidone, and 2-amino-2-methyl-1-propanol, and
mixtures thereof, and
ii. about 3 parts to about 9 parts by weight of sedimentary
kaolin.
2. A composition in accordance with claim 1 comprising in
admixture:
i. one part by weight of N-methyl-2-pyrrolidone, and
ii. about 4 parts to about 6 parts by weight of sedimentary
kaolin.
3. A composition in accordance with claim 1 wherein said
sedimentary kaolin contains about 14% H.sub.2 O, about 44.9%
SiO.sub.2, and about 38.3% Al.sub.2 O.sub.3 combined together in
the molecular constitution of said kaolin.
4. A composition in accordance with claim 1 comprising about 10-25
percent of said solvent, about 65-90 percent of said kaolin, 0 to
about 10% of a water-soluble salt dedusting agent, selected from
the group consisting of sodium tripolyphosphate, potassium
tripolyphosphate, sodium chloride, potassium chloride, sodium
sulfate, potassium sulfate, tetrasodium pyrophosphate,
tetrapotassium pyrophosphate, sodium dihydrogen orthophosphate,
potassium dihydrogen orthophosphate, trisodium orthophosphate,
tripotassium orthophosphate, sodium carbonate, potassium carbonate,
sodium bicarbonate, potassium bicarbonate, sodium metaborate,
potassium metaborate, sodium metasilicate, potassium metasilicate,
sodium citrate, potassium citrate, sodium sulfite and potassium
sulfite and 0 to about 10% of a surfactant having emulsifying
properties.
5. A composition in accordance with claim 1 comprising about 10-25
percent of said solvent, about 65-90 percent of said kaolin, 0 to
about 10% of sodium tripolyphosphate dedusting agent, and 0 to
about 10% of a surfactant having emulsifying properties.
6. A process for removing hardened adhering food debris from metal
surfaces comprising the steps of:
i. covering said debris with a flowing, particulate mixture
comprising about 3 parts to about 9 parts by weight of sedimentary
kaolin and one part by weight of a solvent selected from the group
consisting of N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone,
N-isopropyl-2-pyrrolidone, or 2-amino-2-methyl-1-propanol, and
mixtures thereof,
ii. contacting said mixture with hot water at 120.degree.F to about
200.degree.F, to form an aqueous cleansing medium,
iii. allowing said aqueous cleansing medium to stand for at least
10 seconds and until at least a part of said debris has loosened,
and
iv. rinsing said aqueous cleansing medium and said loosened debris
from said metal surface.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention finds utility for the removal of stubbornly
adhering hardened or carbonized food debris from metal surfaces of
cookware, and as a hand cleaner.
Heretofore, baked-on or carbonized food debris has been very
difficult to remove from the metal surfaces of cookware, requiring
treatment with an abrasive material, such as scouring steel-wool
pads. Even with this treatment, it was necessary to expend
considerable effort, and often more than one scouring step was
required to remove all of the debris.
2. Discussion of the Prior Art
The essential components of the present invention, i.e., kaolin and
solvents, are individually known.
The kaolin component is described in detail hereinafter and may be
obtained from the firm of Moore and Munger. The solvents are
commercially available, the compounds N-methyl-2-pyrrolidone and
2-amino-2-methyl-1-propanol being listed for example in the Eastman
Kodak Company Catalogue, List No. 45, 1969.
U.S. Pat. No. 2,174,242 discloses the method for the preparation of
2-amino-2-ethyl-1,3-propanediol, a compound analogous to the
instant 2-amino-2-methyl-1-propanol.
SUMMARY OF THE INVENTION
It has now been discovered that baked-on, hardened, or carbonized
food debris can be easily removed from metal surfaces of cookware
by a simple procedure, specifically by contacting the debris with a
mixture of kaolin and a compound selected from the group consisting
of N-methyl-2-pyrrolidone, N-ethyl-pyrrolidone,
N-isopropyl-2-pyrrolidone, and 2-amino-2-methyl-1-propanol and
mixtures thereof, followed by soaking in hot water, and
rinsing.
It is an object of the invention to provide a simple composition
suitable for substantially completely removing stubbornly adhering
food debris from metal surfaces of cookware.
It is another object of the invention to provide a simple
composition effective to remove substantially completely stubbornly
adhering food debris from metal surfaces of cookware in an
operation that does not require scrubbing.
It is a further object of the invention to provide a simple
composition suitable with the conjoint use of water for removing
grease and grime from the hands.
DETAILED DESCRIPTION OF THE INVENTION
The invention provides a composition comprising a mixture of kaolin
and a solvent selected from the group consisting of
N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone,
N-isopropyl-2-pyrrolidone, and 2-amino-2-methyl-1-propanol, and
mixtures thereof, as a cleaning composition for the purposes
mentioned hereinabove.
More specifically, the invention provides a composition
comprising:
i. about 3 to about 9 parts by weight of sedimentary kaolin,
and
ii. 1 part by weight of one or more of the aforementioned
solvents.
Ratios of solvent higher than 1 part solvent for 3 parts kaolin
result in a powder which although free flowing, tends to pressure
pack.
Mixtures of kaolin and solvent within the ratios in accordance with
the present invention are free flowing and are in fine particulate
form, and tend to be somewhat dusty. The dusting is eliminated or
greatly reduced if there is incorporated in the composition about
2% to about 10% of a dedusting agent. Suitable dedusting agents
include such water-soluble salts as sodium tripolyphosphate, sodium
chloride, sodium sulfate, tetrasodium pyrophosphate, sodium
dihydrogen orthophosphate, disodium hydrogen orthophosphate,
trisodium orthophosphate, sodium carbonate, sodium bicarbonate,
sodium metaborate, sodium tetraborate, sodium metasilicate, sodium
citrate, sodium sulfite, and the coresponding potassium salts. The
sodium tripolyphosphate also serves as a dispersant by assisting in
preventing lump formation when hot water is added to the baked-on
food debris which has been coated with the composition.
If desired, a surfactant may be included in the composition to
assist in emulsifying any overlying grease adhering to the baked-on
food debris.
If a surfactant is employed, the type thereof is immaterial, so
long as the emulsification properties are adequate to assist the
cleaning operation when the burned-on food debris contains grease.
Suitable surfactants are found within the classes of anionics,
amphoterics, and nonionics, and are well known to those skilled in
the art. The alkylbenzenesulfonates, alkyl sulfates, sulfated
ethoxylated fatty alcohols, taurates, isethionates, ethoxylated
fatty alcohols, alkyl beta-alanines, and the cycloimidates
disclosed in U.S. Pat. Nos. 2,528,378 and 2,781,354 are suitable.
More specific surfactant species may be selected from the
disclosures in the texts "Surface-Active Agents", Schwartz and
Perry, Volume I, 1949, and "Surface-Active Agents and Detergents",
Schwartz, Perry and Berch, Volume II, 1958, both published by
Interscience Publishers, Inc., New York, which are incorporated
herein by reference.
The compositions useful for carrying out the process of the present
invention may contain the above-mentioned components in the
following proportions:
Percent By Weight Broad Preferred
______________________________________ Solvent 10-25 12-20 Kaolin
65-90 70-85 Sodium tripolyphosphate 0-10 3-10 Surfactant 0-10 0-5
______________________________________
The invention provides a process for removing adhering hardened or
carbonized food debris from metal surfaces of cookware comprising
the steps of:
i. covering said debris with a flowable, particulate mixture of
sedimentary kaolin and a compound selected from the group
consisting of N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone,
N-isopropyl-2-pyrrolidone, and 2-amino-2-methyl-1-propanol, and
mixtures thereof,
ii. contacting said mixture with hot water at 120.degree.F to about
200.degree.F, to form an aqueous cleansing medium,
iii. allowing said aqueous cleansing medium to stand for at least
10 seconds and until at least a part of said debris has loosened,
and
iv. rinsing said aqueous cleansing medium and said loosened debris
from said metal surface.
It is within the scope of the present invention to employ water
that is sufficiently hot, and to allow the aqueous cleansing medium
to stand a sufficient length of time, to remove the debris
substantially completely with no scrubbing or abrasion.
The process of the invention in most instances results in the
loosening of the entire area of debris with substantially no spots
that remain stubbornly adhering. The force of water from the faucet
may usually be used, if desired, to remove the loosened particles
of debris, or these may be removed with a soft cloth or sponge,
usually with the article being cleaned having contact with running
water or under submersion in water.
As used herein the word "rinsing" includes the assistance of a soft
cloth or sponge or the like to remove loosened debris. The thicker
or more stubborn spots of debris may require a second treatment
with the composition of the invention.
N-alkyl-2-pyrrolidones useful in the practice of the present
invention have the structural formula: ##SPC1##
wherein R is a lower alkyl group having from 1 to 3 carbon atoms.
The compounds may be made by the procedure outlined in the handbook
"M-Pyrol.sup.(R) " published by the GAF Corporation Chemical
Division, 140 W. 51st Street, New York, N.Y. 10022 (1972), the
disclosures of which are incorporated herein by reference. The
above-described pyrrolidones are miscible with water and many
organic solvents. The methyl derivative has a boiling point of
202.degree.C at 760 mm pressure, the ethyl derivative has a boiling
point of 97.degree.C at 20 mm pressure, and 218.degree.C at 751 mm
pressure, and the isopropyl derivative has a boiling point of
221.degree.-222.degree.C at 736 mm pressure.
The N-alkyl-2-pyrrolidones may be replaced in whole or in part by
2-amino-2-methyl-1-propanol with good results. The latter is too
alkaline for use on aluminum utensils, but is suitable for use on
stainless steel, cast iron, or other surfaces not affected by
alkalis.
The compound 2-amino-2-methyl-1-propanol may be readily prepared by
those skilled in the art. It is an article of commerce and may be
purchased from the Eastman Kodak Company.
The kaolin useful in the practice of the present invention is a
Georgia sedimentary clay of very fine particle size. It is a
secondary, or alluvial, clay having an aspect ratio, that is, the
ratio of the longest linear dimension of a particle to its shortest
linear dimension, of about 10:1 to about 12:1. The kaolin has been
subjected to a process of froth floating and deflocculation, and is
substantially non-agglomerated.
A useful kaolin product is described in a brochure entitled
"American and English Clays for the Paper Industry", published by
the Anglo-American Clays Corporation, 52 Executive Park South,
Atlanta, Ga., 30329. The clay employed in the Examples herein is
the grade designated "Alphagloss", characterized in the above-named
brochure as being a spray-dried particulate material of which 97%
is finer than 2 micrometers, and 0.005% is left on a No. 325 screen
is a wet-screening process. The particles are substantially dry,
having 0 to 1% moisture, and have a pH of about 6.5 to about 7.5.
The principal component may be represented by the oxide-type
formula Al.sub.2 O.sub.3.2SiO.sub.2.2H.sub.2 O, and comprises about
97%-98% of the kaolin. "Alphagloss" is a trademark of, and is made
by, the Anglo-American Clays Corporation. It may be purchased from
Moore and Munger, 777 Summer Street, Stamford, Conn., 06901.
The invention may be more fully understood by reference to the
following Examples, which are illustrative but are not to be
considered limitative of the invention.
EXAMPLE 1
Two 4-inch square polished aluminum panels are soiled with food
debris by placing thereon a small quantity of homogenized milk,
evaporating on a water bath to a syrupy consistency, spreading the
syrup to form a substantially uniform layer, then baking for one
hour at 400.degree.F, and cooling to room temperature.
A cleaning composition is prepared having the following
formula:
Percent By Weight ______________________________________
N-methyl-2-pyrrolidone 15.00 Kaolin (Alphagloss) 80.00 Sodium
tripolyphosphate 5.00 100.00
______________________________________
pH of a 1% aqueous solution: 9.0
The mixture, a free-flowing powder, is sprinkled on the
above-described soiled panels contained in a porcelain basin,
covering the panels completely. Hot water at about 130.degree.F is
poured into the basin, covering the panels to a depth of one inch.
The panels are allowed to soak for 10 minutes in the water
maintained at a temperature of 130.degree.-140.degree.F. The panels
are then removed from the water and rinsed under a hot tap water
spray without rubbing. With the aid of a plexiglass template
divided into 12 marked rectangular areas, it is estimated that the
above-described treatment removes about 95% of the soil.
EXAMPLE 2
A stainless steel pan is soiled by spreading over the entire inner
surfaces thereof a 1:1 mixture of milk and margarine and baking at
about 400.degree.F to form a baked-on, carbonized, hardened film of
food debris. The particulate composition set forth in Example 1 is
placed over the bottom and sides, covering the soil completely. Hot
water (160.degree.F) is placed in the pan and allowed to remain for
30 minutes. This treatment lifts the soil in the form of a film or
skin, leaving the bottom of the stainless steel pan clean and
bright. Spotty small areas of soil remain on the side, presumably
due to failure of the cleaning product to cover the soil completely
at the time of introducing the hot water.
EXAMPLE 3
A black iron frying pan is soiled and cleaned in the manner
described in Example 1, except that 1%, total composition basis, of
the 1-methyl-2-pyrrolidone is replaced by 1% of
2-amino-2-methyl-1-propanol. Near complete removal, leaving only a
few partially soiled areas, is effected from bottom and sides.
EXAMPLE 4
Three 4-inch square polished aluminum panels are soiled as
described in Example 1. The three panels are separately treated
with the three components of the composition of Example 1 as the
sole cleansing agent in the manner set forth in Example 1. None of
the three components, namely 1-methyl-2-pyrrolidone, kaolin, or
sodium tripolyphosphate, exhibits any cleansing action.
EXAMPLE 5
The following composition is suitable for removing baked-on food
debris from stainless steel or iron cooking utensils.
______________________________________ Percent By Weight
______________________________________ 2-amino-2-methyl-1-propanol
15.00 Kaolin (Alphagloss) 80.00 Sodium tripolyphosphate 5.00 100.00
______________________________________
pH of a 1% aqueous solution: 10.6
In place of the sodium tripolyphosphate component shown above, many
other water-soluble salts may be employed with comparable results.
Among the suitable salts are sodium chloride, sodium sulfate,
tetrasodium pyrophosphate, sodium dihydrogen orthophosphate,
disodium hydrogen orthophosphate, trisodium orthophosphate, sodium
carbonate, sodium bicarbonate, sodium metaborate, sodium
tetraborate sodium metasilicate, sodium citrate, sodium sulfite,
and the corresponding potassium salts.
EXAMPLE 6
The following compositions are within the invention:
Percent By Weight Components A B C D E F G H
__________________________________________________________________________
N-methyl-2-pyrrolidone 10 20 25 N-ethyl-2-pyrrolidone 22 10
N-isopropyl-2-pyrrolidone 15 2-amino-2-methyl-1- 25 20 propanol
Kaolin (Alphagloss) 90 68 65 75 75 72 70 85 Sodium tripolyphosphate
10 5 5 5 Sodium lauryl sulfate 10 3 Sodium alkylbenzene- 5
sulfonate.sup.(a) Lauryl alcohol . 30 10 E.O..sup.(b)
__________________________________________________________________________
.sup.(a) The alkyl group is a straight chain averaging about 13
carbon atoms. .sup.(b) A nonionic surfactant containing 30 molar
proportions of ethylen oxide in the molecule.
Having thus described the best modes for carrying out the
invention, modifications thereof will occur to those skilled in the
art, and the invention is to be limited only by the scope of the
appended claims.
* * * * *