CA1098656A - Aerosol compositions useful for drain cleaning - Google Patents
Aerosol compositions useful for drain cleaningInfo
- Publication number
- CA1098656A CA1098656A CA292,209A CA292209A CA1098656A CA 1098656 A CA1098656 A CA 1098656A CA 292209 A CA292209 A CA 292209A CA 1098656 A CA1098656 A CA 1098656A
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Abstract
AEROSOL COMPOSITIONS USEFUL FOR DRAIN CLEANING
ABSTRACT OF THE DISCLOSURE
Aerosol compositions useful for drain cleaning are provided, which each comprise (1) an aliphatic hydrocarbon solvent, such as methylene chloride, having one or more chlorine atoms substituted for hydrogen, a flash point at a temperature and pressure higher than standard temperature and pressure, and a vapor pressure between about 150 and 420 millimeters of mercury at a temperature between about 20°C
and 25°C; (2) a propellant, such as propane, in a maximum amount of about 8%, by weight, of the composition; and (3) a compressed gas, such as carbon dioxide.
ABSTRACT OF THE DISCLOSURE
Aerosol compositions useful for drain cleaning are provided, which each comprise (1) an aliphatic hydrocarbon solvent, such as methylene chloride, having one or more chlorine atoms substituted for hydrogen, a flash point at a temperature and pressure higher than standard temperature and pressure, and a vapor pressure between about 150 and 420 millimeters of mercury at a temperature between about 20°C
and 25°C; (2) a propellant, such as propane, in a maximum amount of about 8%, by weight, of the composition; and (3) a compressed gas, such as carbon dioxide.
Description
r ~ ~
BACKGROUND OF THE INVENTION
This invention relates to aerosol compositions useful for cleaning conduits, such as household drains. More par-ticularly, it relates to such a pressurized composition which may be applied as a vapor against a clog in a drain to dissolve the clog.
The application of a pressurized composition against a drain clog to clear the drain is well known. U.S. Pats.
Nos. 2,300,319; 3,315,280; 3,426,774; and 3,879,771 disclose hydraulic rams utilizing water alone or water and carbon dioxide for drain cleaning. U.S. Pat. No. 3,823,427 discloses aerosol hydraulic drain opening compositions using either a blend of non-flammable, fluorocarbon propellants with hydro-carbon propellants or a blend of carbon dioxide ox nitrous oxide with suitable vapor depressants and fluorocarbon propellants. U.S. Pat. No. 3,156,584 discloses drain cleaning compositions in which fluorocarbon propellants are carried in s,olvents such as perchloroethylene, trichlorethylene, methyl chloride, chloroethene, or mixtures thereof. The disadvantage of a drain cleaning composition containing only water and/or carbon dioxide is that the composition includes r.o ingredient capable of chemically acting on the materials which make up a drain clog. As fluorocarbons in seneral ~865~
."
have recently become disfavored, a drain cleaner including this type of ingredient is not practical.
A known composition of methylene chloride and carbon dioxide has been found to be inefficient as a drain cleaner.
Also, a known composition of methylene chloride and a hydro-carbon propellant has been considered to be impractical, as stated in U.S. Pat. No. 3,156,584, because the combination of a hydrocarbon propellant and a solvent carrier could be flammable.
It has now been found, however, that this previously considered combination of a hydrocarbon propellant and solvent, such as propane and methylene chloride, when further combined with a compressed gas, such as carbon dioxide, provides not only an efficient drain cleaning composition, but also provides a composition that is sub-stantially non flammable, in accordance with the definition of flammability provided below, when the maximum amount of propellant is about 8%, by weight, of the composition.
SUMMARY OF THE INVENTION
A drain cleaning composition of this invention com-prises at least one aliphatic hydrocarbon solvent having oneor more chlorine atoms substituted for hydrogen, a flash point at a temperature and pressure higher than standard temperature and pressure, and a vapor pressure between about 150 millimeters and about 420 millimeters of mercury at a temperature between about 20C and 2SC. The minimum amount of solvent is about 85%, by weight, of the composition.
Such a composition further comprises at least one propellant, the maximum amount of propellant being about 8%, by weight, of the comp~sition, and at least one compressed gas, the minimum amount of compressed gas being about 2%, by weight, of the composition.
The chlorinated aliphatic hydrocarbon solvents most preferred in these compositions are methylene chloride and trichloromethane.
Although the propellants most advantageously utilized are the above referred to hydrocarbon propellants, it has also been found that chlorinated, fluorinated, and fluorochlorinated propellants can also be used in these compositions. Useful propellants are propane, butane, isobutane, ethyl chloride, difluoroethane, and chlorodifluoroethane. The compressed gases of these compositions are carbon dioxide and nitrous oxide. It has been found that compositions containing mixtures of these solvents, propellants, and/or compressed gases also provide effective drain cleaning compositions in accordance with this invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
To determine the particular combinations of the various ones of the above three ingredients that result in substan-tially non-flammable compositions, the flammability of each composition shown in the chart below was tested according to the FLAME PROJECTION TEST of the Chemical Specialties Manu-facturers Association, Bulletin No. 8-64, dated January 7, 1964, in which flammability is defined as follows:
"Contents of self-pressurized containers are "flammable"
if, when tested by the flame projection test there is a flame projection exceeding 18 inches obtained at full valve opening or a flashback (a flame extending back to the dispenser) obtained at any degree of valve opening, or when tested by the close drum test the average time required for explosion of the vapor air mixture is less than 60 seconds."
In determining the flammability of these compositions, the only deviation from the abo~e test was if a tested com-position exhibited any flame projection or flashback, it was considered to be "flammable" and is identified as such below. Alternatively, compositions exhibiting no flame projection or flashback are identified as being non-flam-mable.
To prepare the compositions for the fla.~mability test, the selected solvent and propeilant of the composition to be 40 tested were put into an aerosol can. Next, the can was - -, -- 3 -- ~ i .~ ,, .
.~ '.
pressurized by the introduction therein of the compressed gas.
Reading from left to right, the chart below provides for each composition tested, the test number for the particular composition, the solvent or solvents therein, the amount of solvent(s), the propellant or propellants therein, the amount of propellant(s), the compressed gas or gases therein, the amount of gas(es), the final can pressure, and whether the composition was found to be flammable (F) or non-flammable (NF).
The fill temperature was 70F. in each case. .
15 ~ ~ ~ ~ ~
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.~ oo ~o ~ ~ ~ ~ ~ ~L ~ _ ~ ~r ~ _ co ~ ~ ~X ~ _ ~ ~ ~ o~ _ ~ " '' .,' ,':"
~ ~ ~ ~ := ~ G _ . '.'. '''' ' - 4 - : . :
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...
Turning to TEST 1, the composition tested, which con-tained 8% propellant, was found to be non-flammable.
However, when the amount of propellant was increased by first 20% in TEST 2 and then by almos~ 100% in TEST 3, the resulting compositions were found to be flammable. Thus, the maximum level of propellant preferred for these compositions when they are used as drain cleaners is about 8%, by weight.
To determine if other hydrocarbon propellants could be utilized, the compositions of TESTS 4 and 5 were made and tested. Both compositons were found to be non-flammable.
Additionally, it was found that fluorinated, chlorinated, and fluorochlorinated propellants are suitable for use in these compositions (TESTS 6, 7, and 10). Further, it should be understood that mixtures of these various pro-pellants are contemplated to pe useful in the compositions of this invention.
With regard to TEST 10, the compressed gas of the com-position tested was a mixture of carbon dioxide and nitrousoxide. Such mixtures of compressed gases were found to be suitable not only in compositions having the ingredients of the composition of TEST 10, but also in the compositions of TESTS 9, 19, and 24. Other compressed gases are contemplated to be useful in the compositions of this invention, either alone (TESTS 8, 21, and 23 for nitrous oxide) or in combina-tion.
Turning now to the chlorinated solvent ingredient of these compositions, compositions were prepared having the above-mentioned compressed gases, propellants, and having solvents other than methylene chloride.
As indicated in TESTS 14-17 and 20, l,l,l-trichloro-ethane was not found to be suitable in the compositions ofthese tests because the compositions were flammable. It was found to be suitable when combined with chlorodifluoroethane and the above-mentioned compressed gases (TESTS 18,19, and 21). It is postulated that the non-flammability of the 1~9~36S6 , mixture of l,l,l-trichloroethane and chlorodifluoro~thane when further combined with a compressed gas is due to the much narrower flammable range (volume ~ in air) of chloro-difluoroethane as compared to the propellants mentioned above. This plus the low vapor pressure of chlorodifluoroethane at 70F. (29 p.s.i.g.) means that its fumes are probably not separated from the vapor phase of the l,l,1-trichloroethane fast enough to mix with the air at a rate, or percentage, needed to reach a flammable level.
The comparison below of the flammable levels of some of the more common propellants shows that the lowest level for chlorodifluoroethane is more than four times higher than that of the hydrocarbon propellants and more than twice that of the chlorinated and/or fluorinated propellants.
Propellant Flammable levels*
Propane 2.2 - 9.5%
Isobutane 1.8 - 8.4%
Ethyl chloride 3.8 - 15.0%
Difluoroethane 3.7 - 18.0%
Chlorodifluoroethane 9.0 - 14.8%
*DuPont Aerosol Technical Information ~eports, Volume I, General Properties, Report A-73 or Modern Packaging Ency-clopedia, Volume 40, No. 13A, September, 1967.
Other chlorinated solvents tested were chloroform ~trichloro-methane) and perchloroethylene. As shown in TESTS 22-25, trichloromethane was found to result in the compositions tested being non-flammable while the perchloroethylene com-position was flammable.
Compositions having a combination o both a suitable solvent, 8uch as methylene chloride, and an unsuitable sol-vent, such as 1,1,1-trichloroethane, were tested to deter-mine their flammability. As shown in TESTS 11-13, such compositions were found to be flammable. -From the tests discussed above concerning the chlorinated ~olvent ingredient of the compositions of this invention, it 109~656 .
was determined that these compositions would be non-flammable only if a chlorinated aliphatic hydrocarbon solvent was utilized which had a vapor pressure between about ~50 and 420 millimeters of mercury at a temperature between about 20 and 25C. This conclusion i9 supported by the vapor pres-sures of those above soivents that were found to be suitable;
namely 160 and 340 millimeters of mercury at 20C. for trichloromethane and methylene chloride, respectively.
The preferred amounts, by weight, of these three in-gredients in the compositions of this invention are about 88% to 92% for the chlorinated, aliphatic hydrocarbon solvent, 2% to 8% for the propellant, and 4% to 7% for the compressed gas.
It must be understood, howeverj that the maximum amount of compressed gas that is soluble in a chlorinated solvent and can be filled into an aerosol can containing a solvent/
propellant mixture is governed not only by its solubility .in a particular chlorinated solvqnt, but more importantly by the maximum pressure that can be applied to the product in the can. In an effort to make a drain cleaning composition as efficacious as possible, the can is filled with as much compressed gas as it is designed to safely hold. That is to say, the ma~imum pressure that can be applied to, for instance, a DOT-2P pressure rated aerosol can at 130F is 160 p.s.i.g.
This pressure represents filling a specific weight, or percentage, of the compressed gas. Subse~uently, if a higher pressure rated can is used, for instance, a DOT-2Q
pressure rated aerosol can, the maximum pressure at 130F is increased to 180 p.s.i.g~ This pressure would ~esult in a slightly higher percentage of the compressed gas, as solu-bility in the solvent is directly related to pressure.
A composition comprising, by weight, 88.08% methylene chloride and 8.00% propane was introduced into a DOT-2P
pressure rated aerosol can. The can was filled with 3.92%, by weight, of the composition, of carbon dioxide at 110 p.s.i.g., so that the final pressure of the composition in the can was 160 p.s.i.g. at 130F. This composition was -~Q986~;6 tested and found to be an efficient drain cleaner. Although compositions containing a chlorinated solvent, such as methylene chloride, l,l,l-trichloroethane, or perchloro-ethylene, and propane were found to be efficient as drain cleaners, these compositions are flammable. This may be due to the omission therein of a compressed gas, such as carbon dioxide or nitrous oxide, which are found in the compositions of this invention.
The drain cleaning compositions of the invention are not to be limited by the detailed description of the pre-ferred ingredients thereof discussed above, but rather the scope of this invention should be interpreted by the claims attached hereto in light of the foregoing specification.
BACKGROUND OF THE INVENTION
This invention relates to aerosol compositions useful for cleaning conduits, such as household drains. More par-ticularly, it relates to such a pressurized composition which may be applied as a vapor against a clog in a drain to dissolve the clog.
The application of a pressurized composition against a drain clog to clear the drain is well known. U.S. Pats.
Nos. 2,300,319; 3,315,280; 3,426,774; and 3,879,771 disclose hydraulic rams utilizing water alone or water and carbon dioxide for drain cleaning. U.S. Pat. No. 3,823,427 discloses aerosol hydraulic drain opening compositions using either a blend of non-flammable, fluorocarbon propellants with hydro-carbon propellants or a blend of carbon dioxide ox nitrous oxide with suitable vapor depressants and fluorocarbon propellants. U.S. Pat. No. 3,156,584 discloses drain cleaning compositions in which fluorocarbon propellants are carried in s,olvents such as perchloroethylene, trichlorethylene, methyl chloride, chloroethene, or mixtures thereof. The disadvantage of a drain cleaning composition containing only water and/or carbon dioxide is that the composition includes r.o ingredient capable of chemically acting on the materials which make up a drain clog. As fluorocarbons in seneral ~865~
."
have recently become disfavored, a drain cleaner including this type of ingredient is not practical.
A known composition of methylene chloride and carbon dioxide has been found to be inefficient as a drain cleaner.
Also, a known composition of methylene chloride and a hydro-carbon propellant has been considered to be impractical, as stated in U.S. Pat. No. 3,156,584, because the combination of a hydrocarbon propellant and a solvent carrier could be flammable.
It has now been found, however, that this previously considered combination of a hydrocarbon propellant and solvent, such as propane and methylene chloride, when further combined with a compressed gas, such as carbon dioxide, provides not only an efficient drain cleaning composition, but also provides a composition that is sub-stantially non flammable, in accordance with the definition of flammability provided below, when the maximum amount of propellant is about 8%, by weight, of the composition.
SUMMARY OF THE INVENTION
A drain cleaning composition of this invention com-prises at least one aliphatic hydrocarbon solvent having oneor more chlorine atoms substituted for hydrogen, a flash point at a temperature and pressure higher than standard temperature and pressure, and a vapor pressure between about 150 millimeters and about 420 millimeters of mercury at a temperature between about 20C and 2SC. The minimum amount of solvent is about 85%, by weight, of the composition.
Such a composition further comprises at least one propellant, the maximum amount of propellant being about 8%, by weight, of the comp~sition, and at least one compressed gas, the minimum amount of compressed gas being about 2%, by weight, of the composition.
The chlorinated aliphatic hydrocarbon solvents most preferred in these compositions are methylene chloride and trichloromethane.
Although the propellants most advantageously utilized are the above referred to hydrocarbon propellants, it has also been found that chlorinated, fluorinated, and fluorochlorinated propellants can also be used in these compositions. Useful propellants are propane, butane, isobutane, ethyl chloride, difluoroethane, and chlorodifluoroethane. The compressed gases of these compositions are carbon dioxide and nitrous oxide. It has been found that compositions containing mixtures of these solvents, propellants, and/or compressed gases also provide effective drain cleaning compositions in accordance with this invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
To determine the particular combinations of the various ones of the above three ingredients that result in substan-tially non-flammable compositions, the flammability of each composition shown in the chart below was tested according to the FLAME PROJECTION TEST of the Chemical Specialties Manu-facturers Association, Bulletin No. 8-64, dated January 7, 1964, in which flammability is defined as follows:
"Contents of self-pressurized containers are "flammable"
if, when tested by the flame projection test there is a flame projection exceeding 18 inches obtained at full valve opening or a flashback (a flame extending back to the dispenser) obtained at any degree of valve opening, or when tested by the close drum test the average time required for explosion of the vapor air mixture is less than 60 seconds."
In determining the flammability of these compositions, the only deviation from the abo~e test was if a tested com-position exhibited any flame projection or flashback, it was considered to be "flammable" and is identified as such below. Alternatively, compositions exhibiting no flame projection or flashback are identified as being non-flam-mable.
To prepare the compositions for the fla.~mability test, the selected solvent and propeilant of the composition to be 40 tested were put into an aerosol can. Next, the can was - -, -- 3 -- ~ i .~ ,, .
.~ '.
pressurized by the introduction therein of the compressed gas.
Reading from left to right, the chart below provides for each composition tested, the test number for the particular composition, the solvent or solvents therein, the amount of solvent(s), the propellant or propellants therein, the amount of propellant(s), the compressed gas or gases therein, the amount of gas(es), the final can pressure, and whether the composition was found to be flammable (F) or non-flammable (NF).
The fill temperature was 70F. in each case. .
15 ~ ~ ~ ~ ~
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~o ~ ~ il ~ .~ ~ ~ : ~ ~g~3g ~33~3'~
; ~ ~ ~! i~ ~ ~
~ ~ ~D CO ~ ~ ~olo ~ol o olo o ol~o o o o o o o o o ~ olo ~ol ";
.~ oo ~o ~ ~ ~ ~ ~ ~L ~ _ ~ ~r ~ _ co ~ ~ ~X ~ _ ~ ~ ~ o~ _ ~ " '' .,' ,':"
~ ~ ~ ~ := ~ G _ . '.'. '''' ' - 4 - : . :
- "
...
Turning to TEST 1, the composition tested, which con-tained 8% propellant, was found to be non-flammable.
However, when the amount of propellant was increased by first 20% in TEST 2 and then by almos~ 100% in TEST 3, the resulting compositions were found to be flammable. Thus, the maximum level of propellant preferred for these compositions when they are used as drain cleaners is about 8%, by weight.
To determine if other hydrocarbon propellants could be utilized, the compositions of TESTS 4 and 5 were made and tested. Both compositons were found to be non-flammable.
Additionally, it was found that fluorinated, chlorinated, and fluorochlorinated propellants are suitable for use in these compositions (TESTS 6, 7, and 10). Further, it should be understood that mixtures of these various pro-pellants are contemplated to pe useful in the compositions of this invention.
With regard to TEST 10, the compressed gas of the com-position tested was a mixture of carbon dioxide and nitrousoxide. Such mixtures of compressed gases were found to be suitable not only in compositions having the ingredients of the composition of TEST 10, but also in the compositions of TESTS 9, 19, and 24. Other compressed gases are contemplated to be useful in the compositions of this invention, either alone (TESTS 8, 21, and 23 for nitrous oxide) or in combina-tion.
Turning now to the chlorinated solvent ingredient of these compositions, compositions were prepared having the above-mentioned compressed gases, propellants, and having solvents other than methylene chloride.
As indicated in TESTS 14-17 and 20, l,l,l-trichloro-ethane was not found to be suitable in the compositions ofthese tests because the compositions were flammable. It was found to be suitable when combined with chlorodifluoroethane and the above-mentioned compressed gases (TESTS 18,19, and 21). It is postulated that the non-flammability of the 1~9~36S6 , mixture of l,l,l-trichloroethane and chlorodifluoro~thane when further combined with a compressed gas is due to the much narrower flammable range (volume ~ in air) of chloro-difluoroethane as compared to the propellants mentioned above. This plus the low vapor pressure of chlorodifluoroethane at 70F. (29 p.s.i.g.) means that its fumes are probably not separated from the vapor phase of the l,l,1-trichloroethane fast enough to mix with the air at a rate, or percentage, needed to reach a flammable level.
The comparison below of the flammable levels of some of the more common propellants shows that the lowest level for chlorodifluoroethane is more than four times higher than that of the hydrocarbon propellants and more than twice that of the chlorinated and/or fluorinated propellants.
Propellant Flammable levels*
Propane 2.2 - 9.5%
Isobutane 1.8 - 8.4%
Ethyl chloride 3.8 - 15.0%
Difluoroethane 3.7 - 18.0%
Chlorodifluoroethane 9.0 - 14.8%
*DuPont Aerosol Technical Information ~eports, Volume I, General Properties, Report A-73 or Modern Packaging Ency-clopedia, Volume 40, No. 13A, September, 1967.
Other chlorinated solvents tested were chloroform ~trichloro-methane) and perchloroethylene. As shown in TESTS 22-25, trichloromethane was found to result in the compositions tested being non-flammable while the perchloroethylene com-position was flammable.
Compositions having a combination o both a suitable solvent, 8uch as methylene chloride, and an unsuitable sol-vent, such as 1,1,1-trichloroethane, were tested to deter-mine their flammability. As shown in TESTS 11-13, such compositions were found to be flammable. -From the tests discussed above concerning the chlorinated ~olvent ingredient of the compositions of this invention, it 109~656 .
was determined that these compositions would be non-flammable only if a chlorinated aliphatic hydrocarbon solvent was utilized which had a vapor pressure between about ~50 and 420 millimeters of mercury at a temperature between about 20 and 25C. This conclusion i9 supported by the vapor pres-sures of those above soivents that were found to be suitable;
namely 160 and 340 millimeters of mercury at 20C. for trichloromethane and methylene chloride, respectively.
The preferred amounts, by weight, of these three in-gredients in the compositions of this invention are about 88% to 92% for the chlorinated, aliphatic hydrocarbon solvent, 2% to 8% for the propellant, and 4% to 7% for the compressed gas.
It must be understood, howeverj that the maximum amount of compressed gas that is soluble in a chlorinated solvent and can be filled into an aerosol can containing a solvent/
propellant mixture is governed not only by its solubility .in a particular chlorinated solvqnt, but more importantly by the maximum pressure that can be applied to the product in the can. In an effort to make a drain cleaning composition as efficacious as possible, the can is filled with as much compressed gas as it is designed to safely hold. That is to say, the ma~imum pressure that can be applied to, for instance, a DOT-2P pressure rated aerosol can at 130F is 160 p.s.i.g.
This pressure represents filling a specific weight, or percentage, of the compressed gas. Subse~uently, if a higher pressure rated can is used, for instance, a DOT-2Q
pressure rated aerosol can, the maximum pressure at 130F is increased to 180 p.s.i.g~ This pressure would ~esult in a slightly higher percentage of the compressed gas, as solu-bility in the solvent is directly related to pressure.
A composition comprising, by weight, 88.08% methylene chloride and 8.00% propane was introduced into a DOT-2P
pressure rated aerosol can. The can was filled with 3.92%, by weight, of the composition, of carbon dioxide at 110 p.s.i.g., so that the final pressure of the composition in the can was 160 p.s.i.g. at 130F. This composition was -~Q986~;6 tested and found to be an efficient drain cleaner. Although compositions containing a chlorinated solvent, such as methylene chloride, l,l,l-trichloroethane, or perchloro-ethylene, and propane were found to be efficient as drain cleaners, these compositions are flammable. This may be due to the omission therein of a compressed gas, such as carbon dioxide or nitrous oxide, which are found in the compositions of this invention.
The drain cleaning compositions of the invention are not to be limited by the detailed description of the pre-ferred ingredients thereof discussed above, but rather the scope of this invention should be interpreted by the claims attached hereto in light of the foregoing specification.
Claims (16)
1) An aerosol composition useful for drain cleaning comprising:
at least one aliphatic hydrocarbon solvent having one or more chlorine atoms substituted for hydrogen, a flash point at a temperature and pressure higher than standard temperature and pressure, and a vapor pressure between about 150 millimeters and about 420 millimeters of mercury at a temperature between about 20°C and about 25°C, the minimum amount of hydrocarbon being about 85%, by weight, of the composition;
at least one propellant, the maximum amount of propellant being about 8%, by weight, of the composition selected from the group consisting of propane, butane, isobutane, ethyl chloride, difluoroethane, and chlorodifluoro-ethane; and at least one compressed gas selected from the group consisting of carbon dioxide, nitrous oxide, and mixtures thereof, the minimum amount of compressed gas being about 2%, by weight, of the composition.
at least one aliphatic hydrocarbon solvent having one or more chlorine atoms substituted for hydrogen, a flash point at a temperature and pressure higher than standard temperature and pressure, and a vapor pressure between about 150 millimeters and about 420 millimeters of mercury at a temperature between about 20°C and about 25°C, the minimum amount of hydrocarbon being about 85%, by weight, of the composition;
at least one propellant, the maximum amount of propellant being about 8%, by weight, of the composition selected from the group consisting of propane, butane, isobutane, ethyl chloride, difluoroethane, and chlorodifluoro-ethane; and at least one compressed gas selected from the group consisting of carbon dioxide, nitrous oxide, and mixtures thereof, the minimum amount of compressed gas being about 2%, by weight, of the composition.
2) The composition of Claim 1 wherein the solvent, propellant, and compressed gas are present in the amount of about 88% to 92%, 2% to 8%, and 4% to 7%, respectively, by weight, of the composition.
3) The composition of Claim 1 wherein the solvent is selected from the group consisting of methylene chloride, chloroform, and mixtures thereof.
4) The composition of Claim 1 wherein the propellant is selected from the group consisting of propane, butane, isobutane, and mixtures thereof.
5) The composition of Claim 1 wherein the propellant is ethyl chloride.
6) The composition of Claim 1 wherein the propellant is difluoroethane.
7) The composition of Claim 1 wherein the propellant is chlorodifluoroethane.
8) The composition of Claim 2 wherein the solvent is selected from the group consisting of methylene chloride, chloroform, and mixtures thereof.
9) The composition of Claim 8 wherein the propellant is ethyl chloride.
10) The composition of Claim 8 wherein the propellant is difluoroethane.
11) The composition of Claim 8 wherein the propellant is chlorodifluoroethane.
12) The composition of Claim 8 wherein the propellant is selected from the group consisting of propane, butane, isobutane, and mixtures thereof.
13) The composition of Claim 12 wherein the solvent, propellant, and compressed gas are present in the amount of about 88%, 8%, and 4%, respectively, by weight, of the composition.
14) The composition of Claim 13 wherein the solvent is methylene chloride, the propellant is propane, and the compressed gas is carbon dioxide.
15) An aerosol composition useful for drain cleaning comprising a minimum amount of about 85% of 1,1,1-trichloroethane, a maximum amount of about 8% of chlorodifluoroethane, and a minimum amount of about 2% of a compressed gas selected from the group consisting of carbon dioxide, nitrous oxide, and mixtures thereof, the percentages being by weight of the composition.
16) The composition of Claim 15 wherein the 1,1,1-tri-chloroethane, chlorodifluoroethane, and compressed gas are present in the amount of about 88% to 92%, 2% to 8%, and 4%
to 7%, respectively, by weight, of the composition.
to 7%, respectively, by weight, of the composition.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US84125877A | 1977-10-12 | 1977-10-12 | |
| US841,258 | 1977-10-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1098656A true CA1098656A (en) | 1981-04-07 |
Family
ID=25284419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA292,209A Expired CA1098656A (en) | 1977-10-12 | 1977-12-01 | Aerosol compositions useful for drain cleaning |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1098656A (en) |
-
1977
- 1977-12-01 CA CA292,209A patent/CA1098656A/en not_active Expired
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