[0001] The present invention relates to a method for removing soil from textiles using cyclic
dimethylpolysiloxanes. In particular, this invention relates to the use of cyclic
dimethylpolysiloxanes for removal of oily/greasy stains from textiles.
[0002] Textile products such as fabrics, carpets and upholstery often develop prominent
stain spots from inadvertent contact with foodstuff and other materials containing
grease and oils. Various organic solvents such as alcohols, petroleum hydrocarbons,
and chlorinated hydrocarbons have been used in cleaning compositions adapted for direct
application to fabric as spot removers.
[0003] Several approaches to formulating spot cleaning compositions are known. For instance,
nonresidue cleaners are formulated with volatile components only. After dissolving,
mobilizing, and removing the stained material, such formulations are intended to completely
evaporate leaving no residue components on the textile. Other cleaning compositions
employ a combination of solvent and solid, absorbent particles. The solvent mobilizes
the soil and the absorbent solid attracts the soil and solvent to itself. The residue
of absorbent solid is intended to be easily removed from the textile by brushing or
vacuuming. Yet another approach involves liquid detergent compositions which have
been adapted as prewash spot removers. These compositions usually contain concentrated
synthetic surfactants with alcohol or other solvents. When used as a prewash spot
remover, the nonvolatile surfactant components remain on the textile as a residue
which is removed by a conventional home laundry operation. In the aqueous wash, the
prewash spot remover composition additionally functions in the manner of a heavy-duty
laundry detergent.
[0004] While known spot cleaning compositions effectively remove some stains, other types
of stains may be unaffected or only incompletely removed by the compositions. In other
cases, the cleaning composition itself may damage or leave a residue on the textile
in such a way that a visible ring occurs around the treated area. It is an object
of the present invention to reduce the problems associated with the prior art cleaning
compositions by providing a new method of cleaning stains using volatile silicone
fluids that effectively mobilize oil and grease stains, are nondamaging to a wide
range of textiles both synthetic and natural, and leave no residue or visible ring
on treated textiles.
[0005] It is known from U.S. Patent No. 4,324,595, to remove tacky adhesives from substrates
by using octamethylcyclotetrasiloxane fluid to detackify the adhered adhesive. The
process is taught to be particularly useful for removing tacky adhesives from human
skin, but it is also indicated that the process is applicable to removing tacky adhesives
from a wide range of substrates including textiles. However, this patent teaches the
removal of only tacky adhesives, it does not suggest removing oil and grease stains
with cyclic dimethylsiloxanes.
[0006] Stain removing compositions are disclosed in Japanese Patent Publication Kokai No.
(1974)-35681, which contain small amounts (0.5 to 10 weight percent) of silicone oil
combined with cleaning solvents such as trichlorethane and petroleum hydrocarbons.
Although the type of silicone oil employed is not further identified, it is taught
that the silicone remains on the fabric after cleaning to provide continuing water
repellency and soil resistance for the fabric. Consequently, it is apparent that this
publication does not contemplate the use of completely volatile cyclic dimethylpolysiloxanes.
[0007] An aerosol type aqueous cleaning composition is disclosed in Japanese Patent Publication
Kokai No. (1978)-56203, which contains nonionic surfactant, alkanolamine, glycol ether,
alcohol, propellant, and 0.02 to 0.1 weight percent of linear dimethylpolysiloxane
with 2 to 7 silicon atoms per molecule. This publication discloses only the use of
very low amounts of linear dimethylpolysiloxanes and does not contemplate the use
of larger, solvent-effective amounts of the cyclic dimethylpolysiloxanes.
[0008] The use of tetraethoxysilane as a solvent for removing grease from textiles is disclosed
in Russian Patent Publication 979548-A. However, tetraethoxysilane is not stable in
contact with water and may hydrolyze forming alcohol and silica solids.
[0009] A process for dry cleaning and waterproofing of fabrics is disclosed in U.S. Patent
No. 3,123,494 which process employs a silicone composition diluted in typical dry
cleaning solvents. The silicone compositions recommended are mixtures of linear dimethylpolysiloxane
fluids and crosslinked methylsiloxane resins. Excess liquid cleaning mixture is removed
from the textiles by centrifuging but retained silicone provides a continuing waterproofing
effect on the textile. Again, it is apparent that this publication does not contemplate
the use of completely volatile cyclic dimethylpolysiloxanes as a cleaning solvent.
[0010] Liquid cleaning compositions for removing dirt and grit from solid surfaces are disclosed
in U.S. Patent No. 2,955,047. The compositions contain surfactants, water, water-miscible
organic solvent, and an oil-in-water emulsion of dimethylpolysiloxane oil. The specified
siloxanes are linear polymers with viscosities in the range of 200 to 350 centistokes.
The. siloxane polymer is said to impart a high glossy polish to the treated surfaces
by depositing a monomolecular film on the surface. Somewhat similarly, U.S. Patent
No. 2,993,866 teaches an aerosol glass cleaner composition containing isopropanol,
fluorochlorohydrocarbon propellants, and linear dimethylpolysiloxane having a viscosity
of about 200 centistokes.
[0011] An all purpose cleaner composition containing a mixture of surfactants, isopropyl
alcohol, and a silicone defoaming agent is disclosed in U.S. Patent No. 4,311,608.
The silicone defoaming agent is an oil-in-water emulsion of dimethylsiloxane polymer.
[0012] A cleaner (apparently a wiper type) impregnated with a composition containing mineral
oils or alcohols with organopolysiloxanes is disclosed in Japanese Patent Publication
Kokai No. (1975)-161059. The organopolysiloxanes are characterized by having a viscosity
of not more than 30 centipoise at 20°C.
[0013] This invention concerns a method for cleaning textiles which comprises applying to
a soiled textile a liquid composition containing an effective amount to aid soil removal
of a cyclic siloxane selected from the group consisting of octamethylcyclotetrasiloxane,
decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane and removing from
the textile a combination of soil and cyclic siloxane.
[0014] In use, the novel textile cleaning compositions are applied to a soiled area of clothing,
carpet, or other textile by spraying, pouring, or from a cloth or sponge applicator.
The composition may be rubbed or brushed into the textile to facilitate loosening
and dissolving the soil components. The soil-solvent combination is then removed from
the textile by any of the well known methods such as blotting with absorbent material,
absorption unto particulate material followed by vacuuming, or a conventional home
laundry operation.
[0015] The cyclic siloxanes employed in the liquid cleaning and spot removing compositions
of this invention are available commercially and are made by well known methods such
as, for example, the hydrolysis and condensation of dimethyldichlorosilane.
[0016] Compared with the linear polydimethylsiloxanes the cyclic siloxanes employed according
to this invention are relatively volatile materials having boiling points below about
250°C at 760 mm Hg. A single cyclic siloxane may be used in the liquid cleaning composition
or any mixture of two or more of the cyclic siloxanes may be used. Specifically preferred
cyclic siloxanes for use in this invention are octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane,
and dodecamethylcyclohexasiloxane. It should be understood that useful cyclic siloxane
mixtures may contain, in addition to the preferred cyclic siloxanes, minor amounts
of other cyclic siloxanes including hexamethylcyclotrisiloxane or higher cyclics such
as tetradecamethylcycloheptasiloxane. Generally the amount of these other cyclic siloxanes
in useful cyclic siloxane mixtures will be less than about 10 percent based on the
total weight of the mixture.
[0017] The amount of cyclic siloxane used in the liquid cleaning compositions of this invention
is not critical so long as the amount used is effective'to aid soil removal from textiles.
In general, the cleaning composition may contain, for example, from 1 to 100 percent
by weight of the cyclic siloxanes. It is preferred that the cleaning composition contain
from 5 to 100, or more preferably 10 to 100, percent by weight of the cyclic siloxanes.
[0018] Other adjuvants may be included in the liquid cleaning compositions of this invention
such as conventional cleaning solvents, absorbent solid particulate materials, synthetic
builders, water soluble organic detergent compounds, and cationic antistatic substances.
[0019] For example, nonresidue spot cleaning compositions may contain conventional cleaning
solvents mixed with cyclic siloxanes according to the present invention. Any conventional
cleaning solvent having a boiling point below about 250°C can be mixed with the cyclic
siloxanes to prepare a liquid composition useful in the present invention. Useful
additional cleaning solvents include alcohols such as isopropanol and butanol, petroleum
hydrocarbons such as mineral spirits, and chlorinated hydrocarbons such as methylene
dichloride, tetrachloroethylene, and trichloroethylene. Surprisingly, it has been
found that a mixture of cyclic siloxane and conventional cleaning solvent is more
effective at mobilizing stains than is either the cyclic siloxane or the conventional
solvent alone.. Mixtures of cyclic siloxanes and conventional solvents selected from
the group consisting of petroleum hydrocarbons and chlorinated hydrocarbons are especially
effective. Mixtures containing about 30 to 70 percent by weight of conventional cleaning
solvent and 30 to 70 percent by weight of the cyclic siloxane are preferred because
of their superior ability to mobilize stains.
[0020] Cleaning compositions of the solvent/absorbent class are also useful in the method
of this invention. Such cleaning compositions may contain in addition to the cyclic
siloxane any of the absorbent materials known for such applications. Useful absorbent
materials include mineral particulates such as silica, talc, diatomaceous earth, kaolinite;
organic particulates such as starch and modified starch, nut shell flour, and ground
rice hulls; and synthetic porous polymers such as the urea-formaldehyde polymer particles
described in U.S. Patent No. 3,910,848, which more fully describes the polymer particles.
The absorbent material is generally used in amounts of about 5 to 40 percent based
on the weight of cleaning solvent in the composition.
[0021] Cleaning compositions of the solvent/absorbent class may also include a cationic
antistatic agent to facilitate the removal of the particulate material during brushing
or vacuuming of the textile material. Useful cationic antistats include quaternary
nitrogen salts that contain at least one C
10 to C
24' aliphatic hydrocarbon substituent on the nitrogen such as stearyltrimethylammonium
chloride. Antistatic agents are typically employed in amounts of about 0.1 to 3 percent
by weight based on the total weight of the cleaning composition.
[0022] The method for cleaning textiles of this invention also includes the use of prewash
spot remover compositions containing nonvolatile surfactant components in addition
to cyclic siloxane solvent. Such prewash spot remover compositions will generally
include a water soluble organic detergent material and synthetic builders in combination
with the cyclic siloxane solvent. Detergent compounds useful in prewash spot removers
are the anionic, nonionic, zwitterionic and ampholytic surfactant compounds. Such
detergent compounds are well known to those skilled in the detergent art. Exemplary
detergents are described in the well-known books entitled "Surface Active Agents"
by Schwartz and Perry and "Surface Active Agents and Detergents" by Schwartz, Perry
and Berch, both by Interscience Publishers, New York, N.Y.
[0023] Especially preferred detergents are the nonionic surfactants which are condensation
products of polyethylene oxide with an organic hydrophobic compound which is usually
aliphatic or alkylaromatic in nature. Exemplary nonionic surfactants are polyethylene
oxide condensates of nonyl phenol and polyethylene oxide condensates of myristyl alcohol.
[0024] Generally, from about 10 to 80 percent by weight of surfactants may be used in the
prewash spot removing compositions of this invention. More preferred prewash spot
removing compositions contain 30 to 70 percent by weight of nonionic surfactants.
[0025] Prewash spot removers of this invention may also contain a variety of builder compounds
such as sodium tripolyphosphate, sodium carbonate, sodium silicate, the alkali metal,
ammonium and substituted ammonium salts of oxydisuccinic acid, oxydiacetic acid, carboxymethyloxymalonic
acid, carboxymethyloxysuccinic acid, lactoxysuccinic acid, citric acid, mellitic acid,
tetrahydrofurantetracarboxylic acid, polyacrylic acid, nitrilotriacetic acid, oxidized
starches and mixtures thereof. Builders are generally added to prewash spot removing
compositions in amounts ranging from O.to about 50 percent by weight based on the
weight of the . total composition.
[0026] The liquid compositions of the present invention are especially adapted for direct
application to stains and soils on fabrics and other textiles. The compositions can
be applied to soiled textiles by any of the commonly used methods. The liquid compositions
may be poured or sprayed onto the stains. Alternatively the composition may be brushed
or rubbed onto the stained or soiled area using absorbent items such as brushes, paper
towels, cloth or sponges that contain the cleaning composition.
[0027] Once the cleaning composition has been applied to the soiled textile, the cyclic
siloxane acts to dissolve and/or loosen the soil which it contacts. The mobilized
soil is then more easily removed from the textile in combination with the cyclic siloxane.
The cyclic siloxane/soil combination can be removed from the textile by any convenient
method such as blotting the textile with a dry absorbent material. The textile may
be blotted, for example, with sponges, paper towels, or cloth towels. Alternatively,
the soil/cyclic siloxane combination may be.removed by processes such as brushing,
vacuuming, or conventional home laundry operations. Brushing and vacuuming are especially
useful if solid, absorbent particles are employed in the liquid cleaning composition.
Conventional home laundry is the preferred method of removal when nonvolatile surfactants
are used in combination with cyclic siloxane in the cleaning composition.
[0028] The cyclic siloxanes are sufficiently volatile that any residual cyclic siloxane
on the textile, after removal of the soil, readily volatilizes to leave the treated
area dry as well as clean.
[0029] The method of the present invention can be used to remove a wide variety of soils
and stains. The cyclic siloxane is especially effective at removing oil and grease
spots or stains. One special advantage of the cyclic siloxanes as cleaning solvents
is that the formation of a secondary stain ring is either eliminated or greatly reduced
in definition. Another advantage is that the cyclic siloxanes are essentially nontoxic-and
nonharmful in the environment.
[0030] Furthermore, the cyclic siloxanes can be used with a wide variety of fabrics without
harming or in any way changing the appearance of the fabric. The method of cleaning
of this invention can be used on all types of textiles including carpets and fabrics
used for clothing or upholstery.
[0031] The following examples are presented to illustrate the invention, but the examples
in no way limit the scope of the invention as more fully set out in the claims.
[0032] Artificial sebum employed in the following examples was prepared from a base mixture
of palmitic acid (5 g), stearic acid (2.5 g), coconut oil (7.5 g), paraffin (5 g),
spermaceti (7.5 g), olive oil (10 g), squalene (2.5 g), cholesterol (2.5 g), oleic
acid (5 g), and linoleic acid (2.5 g). A melted (120°F) 5 g portion of the base mixture
was combined with oleic acid (4 g) and triethanolamine (8 g) and agitated at 120°F
until homogenous. Then air filter dirt (12 g, +200 mesh) and deionized water (100
ml) were added and the mixture agitated for ten minutes. Additional deionized water
(900 ml) was added and the mixture was agitated in a homogenizer for ten minutes.
The mixture was stored in a 100°F oven and shaken well before using for staining.
Example 1
[0033] The following experiments demonstrate the stain removal ability of cyclic dimethylpolysiloxanes
on 100 percent cotton fabric.
[0034] Cotton fabric test pieces were prepared with approximately 1 inch diameter stains
of used motor oil, cooking oil and artificial sebum. The stains were aged at room
temperature for 24 hours. Stains were cleaned by placing the fabric pieces on several
absorbent paper towels and rubbing the stained area for 20 seconds with a paper towel
saturated with the cleaning fluid.
[0035] The cyclic siloxane fluids tested were (A) octamethylcyclotetrasiloxane, (B) decamethylcyclopentasiloxane,
(C) a cyclic siloxane mixture of about 91 percent by weight octamethylcyclotetrasiloxane
and about 8 percent by weight decamethylcyclopentasiloxane, and (D) a cyclic siloxane
mixture of about 1.3 percent by weight octamethylcyclotetrasiloxane, about 69.3 percent
by weight decamethylcyclopentasiloxane and about 29.1 percent by weight dodecamethylcyclohexasiloxane.
For comparison, hexamethyldisiloxane, mineral spirits, tetrachloroethylene, isopropyl
alcohol, and xylene were also used to clean the stains.
[0036] After drying, the cleaned fabric pieces were rated visually for the degree of stain
removal according to the following scale:
5 = Complete removal
4 = Slight remaining stain
3 = Moderate stain remaining
2 = Slight removal of stain
1 = No change in stain
[0037] The ratings were made by comparison of the test pieces with a standard series of
exemplary stains in a black box using a fluorescent light source. Deviations between
the test pieces and the standard stains are indicated by fractional ratings.
[0038] The used motor oil tended to form a dual stain containing a smaller sludge portion
nearer the center and a larger oil portion which spread out more from the point of
application. Some differences in the cleaning of the two portions of these stains
were observed and consequently the cleaning of each portion was separately rated.
The results of the visual rating are presented in Table 1.

Example 2
[0039] The stain removal testing procedure of Example 1 was repeated using a 65/35 polyester/cotton
fabric. The results of the black box visual ratings of the cleaned fabric are presented
in Table 2.

Example 3
[0040] The stain removal testing procedure of Example 1 was repeated using a 100 percent
polyester fabric. The results of the black box visual ratings of the cleaned fabric
are presented in Table 3.

Example 4
[0041] The stain removal testing procedure of Example 1 was modified by heat setting the
stain before cleaning. Stains were set by placing the fabric in an automatic clothes
dryer at the high temperature setting for two cycles of 60 minutes each. Polyester
(100%) fabric was used in these tests. Results of the black box visual ratings of
cleaned fabric are presented in Table 4.

Example 5
[0042] The following experiments demonstrate the relative efficiency of cyclic dimethylpolysiloxanes
in spreading oil stains on fabric. The degree of spreading of the stain relates to
the extent of mobilization of the stain by the solvent being tested. Generally, the
more effectively a stain can be mobilized, the more easily and completely it can be
removed from the fabric.
[0043] Cotton fabric test pieces (8 inch x 8 inch) were placed in an embroidery hoop and
approximately 1 ml of cooking oil was applied to the center of the fabric. Stains
were aged at room temperature for 24 hours. The fabric was then positioned under a
burette filled with the cleaning fluid. With the burette tip just above the center
of the stain, a 0.5 ml portion of the cleaning fluid was dropped on the stain. The
fabric was allowed to dry at room temperature and the size of the resulting stain
was measured. Generally the stains were circular or slightly oval in shape. The approximate
areas of the stains after the spreading process with various cleaning fluids are shown
in Table 5. In the case of oval shaped stains, approximate areas were calculated as
if the stain were circular using a diameter equal to the average of the length and
width of the oval. The cyclic siloxane fluids tested are described in Example 1.

Example 6
[0044] The stain spreading procedure of Example 5 was repeated using 100% polyester fabric
test pieces. The approximate stain areas after spreading are shown in Table 6.

Example 7
[0045] The stain spreading procedure of Example 5 was repeated using a 65/35 polyester/cotton
fabric. Approximate stain areas after spreading are presented in Table 7.

Example 8
[0046] The following experiments demonstrate the stain spreading efficiency of blends of
cyclic dimethylpolysiloxanes and conventional cleaning fluids such as mineral spirits
and tetrachloroethylene.
[0047] Cooking oil stains were prepared on 65/35 polyester/cotton fabric and the spreading
procedure of Example 5 was repeated except that a 1 ml portion of a blend of cleaning
materials was dropped on the stain. Octamethylcyclotetrasiloxane was blended in various
proportions by weight with either mineral spirits or tetrachloroethylene to prepare
the cleaning materials. The approximate stain areas after spreading are shown in Table
8.

Example 9
[0048] The stain spreading procedure of Example 8 was repeated using decamethylcyclopentasiloxane
blended in various proportions by weight with either mineral spirits or tetrachloroethylene.
The approximate stain areas after spreading are presented in Table 9.

Example 10
[0049] The following tests demonstrate the use of cyclic dimethylpolysiloxanes as a solvent
component in prewash spotting formulations used in home laundering.
[0050] Polyester fabric test pieces were prepared with approximately 1 inch diameter stains
of used motor oil, cooking oil, and artificial sebum. Stains were heat set by placing
the fabric in an automatic clothes dryer at the high temperature setting for two cycles
of 60 minutes each. Each stain was treated with 2 ml of the test fluid as described
in Example 1. Each fluid was left on the stain for one to two minutes. The test fabric
pieces were then washed in a household automatic washer on the normal setting using
the recommended level of a powdered nonphosphate detergent. The fabric pieces were
dried in an automatic clothes dryer on the permanent press setting.
[0051] The cleaned fabric pieces were rated visually for the degree of stain removal according
to the following scale:
5 = Complete removal
4 = Slight remaining stain
3 = Moderate stain remaining
2 = Slight removal of stain
1 = No change in stain
The ratings were made by comparison of the test pieces with a standard series of exemplary
stains in a black box using a fluorescent light source.
[0052] The used motor oil tended to form a dual stain containing a smaller sludge portion
nearer the center and a larger oil portion which spread out more from the point of
application. Some differences in the cleaning of the two portions of these stains
were observed and consequently the cleaning of each portion was separately rated.
The results of the visual rating are presented in Table 10.
