CA1236760A - Brush applied alkali-based paint stripper compositions - Google Patents
Brush applied alkali-based paint stripper compositionsInfo
- Publication number
- CA1236760A CA1236760A CA000466672A CA466672A CA1236760A CA 1236760 A CA1236760 A CA 1236760A CA 000466672 A CA000466672 A CA 000466672A CA 466672 A CA466672 A CA 466672A CA 1236760 A CA1236760 A CA 1236760A
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- Canada
- Prior art keywords
- clay
- composition according
- composition
- gum
- weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D9/00—Chemical paint or ink removers
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
ABSTRACT
Paint stripper compositions based on alkali, particularly caustic soda, together with a mixture of a clay gelling agent and a gum gelling agent in an aqueous dispersion, the ratio of clay to gum being in excess of 1:1 by weight.
Paint stripper compositions based on alkali, particularly caustic soda, together with a mixture of a clay gelling agent and a gum gelling agent in an aqueous dispersion, the ratio of clay to gum being in excess of 1:1 by weight.
Description
~RUSH APPLIED ALKALI-BASED PAINT STRIPPING COMPOSITIONS
The present invention relates to brush applied aLkali-based paint stripping compositions, in particular caustic soda-basecl paint strippers.
Caustic soda-based paint strippers are extremely eeEective in removing alkyd-based gloss paints. Such strippers, however, have the disadvantage that in order to exhibit their highest efficiency they must be applied thickly to the painted surface to be treated. For this reason they are usually formulated as pastes which can cling to the surEace to be treated where, when thus disposed, they can proceed to li~uify the paint carried by the surface. Unfortunately~ this mode of action can give rise to a further disadvantage, namely that unless the surLace is horizontal, liqui~ied paint, together with water from the paste, can run from the surface causing unsightly spillage, and perhaps damage if the liquid which runs comes in contact with substrates such as carpets or other furnishings.
In our earlier British Published Application No. 2,069,522 published August 26, 1981 we have described and claimed a spreadable aqueous paint stripper composition which forms o~er the surface to be treated a peelable skin. That earlier paint stripper composition, like other more conven-tional caustic soda paint strippers, is most suitably applied using a
The present invention relates to brush applied aLkali-based paint stripping compositions, in particular caustic soda-basecl paint strippers.
Caustic soda-based paint strippers are extremely eeEective in removing alkyd-based gloss paints. Such strippers, however, have the disadvantage that in order to exhibit their highest efficiency they must be applied thickly to the painted surface to be treated. For this reason they are usually formulated as pastes which can cling to the surEace to be treated where, when thus disposed, they can proceed to li~uify the paint carried by the surface. Unfortunately~ this mode of action can give rise to a further disadvantage, namely that unless the surLace is horizontal, liqui~ied paint, together with water from the paste, can run from the surface causing unsightly spillage, and perhaps damage if the liquid which runs comes in contact with substrates such as carpets or other furnishings.
In our earlier British Published Application No. 2,069,522 published August 26, 1981 we have described and claimed a spreadable aqueous paint stripper composition which forms o~er the surface to be treated a peelable skin. That earlier paint stripper composition, like other more conven-tional caustic soda paint strippers, is most suitably applied using a
- 2 ~
trowel, spatula or other similar tool, beca~se the applied layer must be relatively thick. As part of the skin-forming promoter components used in the earlier composition there may be employed gelling agents, of which xanthan gums and synthetic clays are preferred.
Furthermore, in one embodiment the earlier compositions employ a particular combination of gelling agents cornprising a xanthan gum, preferablv Kelzan gurn, and a synthetic clay, preferably Laponite. Such a 1~ composition, however, while it contains a mixture of xanthan aum and svnthetic clav, also contains a significant proportion of filler and/or fibrous material, as can be seen from the sDecific Examples, which always contain in excess of 30% by weight of filler or at least 10% by weight of fibre where they contain both xanthan gum and synthetic clay.
Furthermore, in this earlier composition the ratio of Kelzan to Laponite is in the range of from :1 to 1:1.
We have now found sur?risingly that bv employinq a mixture of gum and clav in which the ratio of clay to gum exceeds 1:1 by weight, a gelled caustic soda- or like alkali-based cornoosition can be provided which is suitable for brush application, i.e it can be applied more quickly, especiallv on large, flat areas, and which in situ exhibits a su~ficiently high thixotropy to adhere to vertical sur.aces without significant running.
The composition generally dries to a semi-peelable skin which assists in the removal o~ liquified Daint and any ~3~Ei7~ -running properties of the liquified paint are considerably reduced.
Accordingly, the present invention provides an aqueous paint stripper composition suitable for brush application, which composi-~ion comprises an al~ali in an amount such that the composition is capable of stripping alkyd-based gloss p-aint, together with a mixture of a clay gelling aaent and a gum aellinq agent in aqueous dispersion, the ratio of clay to gum being in excess of ln 1:1 on a weight basis.
In the compositions of the invention, the alkali is most conveniently an alkali metal hydroxide of which s~dium and potassium hydroxide are preferred. The alkali metal hvdroxides give a highly al`~aline composition, and thev are readily available and are cheap. Howev~r, it is possible to use other alkalis having a pH in aaueous solution areate than about ln, such as alkaline silicates, ~or example, sodium metasilicate, and phosphates, for example, trisodium phosphate. Other highly alkaline materials, pre~erably with a pH greater than about 12 and more preferably with a pH greater than ahout 13, are well known in the art and could be used in the compositions of the invention, but sodium hydroxide is generally most preferred for use as the alkali, other compounds being more expensive and milder or slower acting. If desired sodium hydroxide may be provided bv usina a mixture o~ sodium car~onate ~23~
and calcium hydroxide.
In some applications, such as where there may be a danger of staining the surface under the pain-t, it may be desirable to select a milder alkal:i, and in that case trisodium phosphate typically may be used.
The concentration of alkali iTI the composition will be selected accordirlg to known criteria, and this selection is believed to be within the competence oE the man skilled in the art. When sodium hydroxide is employed it is possible to employ concentrations of up to about 25% by weight or higher, but it is preferred to use no more than about 12% by weight of sodium hydroxide or such other percentage as may be prescribed in order to avoid restrictions in use resulting from regulations for handling poisons. The lower concentration limit is determined by the paint stripping task for which the composition is intended, and could be as low as about 1% by weight or even lower. However, the usual concentration range for sodium hydroxide is from about 3% to about 12% by weight, and preferably from about 5% to about 12% by weight. Within those particular ranges any specific concentration may be selected having regard to the required speed o:E s-tripping, and the thickness of the paint layers to be removccl .
~() When other alkalis are used the preferred concentration is judged on a similar basis. Potassium hydroxide may be used at concentrations of up to about 17% by weight or even at higher concentrations up to about 35%
by weight, with about 10 to about 17% by weight being preferred. On the other hand, a typical concentration range for the alkaline salts mentioned above is Erom about 30% to about ~0% by weight.
The compositions of the invention contain a mixture of at leas-t two specific gelling agents comprising at least one gum and at least one clay. The gum gelling agent generally will be a carbohydrate high polymer, ancl pre:Eerably the gum is a xanthan gum, a high molecular weight natural polysaccharide produced in a pure culture fermentation process by the ~3~
microor~anism X~nthomonas campestris. One example o~ a commercially available xantham gum is Kelzan ~Trade Mark), wllich is obtainable from Kelco Inc., a division of ~erck and Co. Inc. Another, and more preferred, examplo of a commorciall~ available xanthan gum is K9 C57, also available ~rom Kolco Inc.
In the compositions of the invention the clay may be any natural or synthotic clay which provides a thickening effect, typically ~ clay wllicll swells in the presence o~ water. Preferred clays are the synthetic clays comprising one or more montmorillonite type materials such as ben-tonite or hectorite.
Thus, especially preferred syn~hetic clays are:
1. Those sold as Laponite ~Trade Mark) clays, which are synthe-tic hectorites and which comprise a magnesium silica-te containing lithium, and Eluorine or hydroxide groups in a layered structure, and which are available rom Laporte Industries Limited;
2. Those known as "specially produced" montmorillonito clays, for example, that sold under the Trade Mark Bentone El~ and availnble from Steetley Chemicals, and whicll is a magnesium montmorillonite ~hydrous magnesium silicate); and
trowel, spatula or other similar tool, beca~se the applied layer must be relatively thick. As part of the skin-forming promoter components used in the earlier composition there may be employed gelling agents, of which xanthan gums and synthetic clays are preferred.
Furthermore, in one embodiment the earlier compositions employ a particular combination of gelling agents cornprising a xanthan gum, preferablv Kelzan gurn, and a synthetic clay, preferably Laponite. Such a 1~ composition, however, while it contains a mixture of xanthan aum and svnthetic clav, also contains a significant proportion of filler and/or fibrous material, as can be seen from the sDecific Examples, which always contain in excess of 30% by weight of filler or at least 10% by weight of fibre where they contain both xanthan gum and synthetic clay.
Furthermore, in this earlier composition the ratio of Kelzan to Laponite is in the range of from :1 to 1:1.
We have now found sur?risingly that bv employinq a mixture of gum and clav in which the ratio of clay to gum exceeds 1:1 by weight, a gelled caustic soda- or like alkali-based cornoosition can be provided which is suitable for brush application, i.e it can be applied more quickly, especiallv on large, flat areas, and which in situ exhibits a su~ficiently high thixotropy to adhere to vertical sur.aces without significant running.
The composition generally dries to a semi-peelable skin which assists in the removal o~ liquified Daint and any ~3~Ei7~ -running properties of the liquified paint are considerably reduced.
Accordingly, the present invention provides an aqueous paint stripper composition suitable for brush application, which composi-~ion comprises an al~ali in an amount such that the composition is capable of stripping alkyd-based gloss p-aint, together with a mixture of a clay gelling aaent and a gum aellinq agent in aqueous dispersion, the ratio of clay to gum being in excess of ln 1:1 on a weight basis.
In the compositions of the invention, the alkali is most conveniently an alkali metal hydroxide of which s~dium and potassium hydroxide are preferred. The alkali metal hvdroxides give a highly al`~aline composition, and thev are readily available and are cheap. Howev~r, it is possible to use other alkalis having a pH in aaueous solution areate than about ln, such as alkaline silicates, ~or example, sodium metasilicate, and phosphates, for example, trisodium phosphate. Other highly alkaline materials, pre~erably with a pH greater than about 12 and more preferably with a pH greater than ahout 13, are well known in the art and could be used in the compositions of the invention, but sodium hydroxide is generally most preferred for use as the alkali, other compounds being more expensive and milder or slower acting. If desired sodium hydroxide may be provided bv usina a mixture o~ sodium car~onate ~23~
and calcium hydroxide.
In some applications, such as where there may be a danger of staining the surface under the pain-t, it may be desirable to select a milder alkal:i, and in that case trisodium phosphate typically may be used.
The concentration of alkali iTI the composition will be selected accordirlg to known criteria, and this selection is believed to be within the competence oE the man skilled in the art. When sodium hydroxide is employed it is possible to employ concentrations of up to about 25% by weight or higher, but it is preferred to use no more than about 12% by weight of sodium hydroxide or such other percentage as may be prescribed in order to avoid restrictions in use resulting from regulations for handling poisons. The lower concentration limit is determined by the paint stripping task for which the composition is intended, and could be as low as about 1% by weight or even lower. However, the usual concentration range for sodium hydroxide is from about 3% to about 12% by weight, and preferably from about 5% to about 12% by weight. Within those particular ranges any specific concentration may be selected having regard to the required speed o:E s-tripping, and the thickness of the paint layers to be removccl .
~() When other alkalis are used the preferred concentration is judged on a similar basis. Potassium hydroxide may be used at concentrations of up to about 17% by weight or even at higher concentrations up to about 35%
by weight, with about 10 to about 17% by weight being preferred. On the other hand, a typical concentration range for the alkaline salts mentioned above is Erom about 30% to about ~0% by weight.
The compositions of the invention contain a mixture of at leas-t two specific gelling agents comprising at least one gum and at least one clay. The gum gelling agent generally will be a carbohydrate high polymer, ancl pre:Eerably the gum is a xanthan gum, a high molecular weight natural polysaccharide produced in a pure culture fermentation process by the ~3~
microor~anism X~nthomonas campestris. One example o~ a commercially available xantham gum is Kelzan ~Trade Mark), wllich is obtainable from Kelco Inc., a division of ~erck and Co. Inc. Another, and more preferred, examplo of a commorciall~ available xanthan gum is K9 C57, also available ~rom Kolco Inc.
In the compositions of the invention the clay may be any natural or synthotic clay which provides a thickening effect, typically ~ clay wllicll swells in the presence o~ water. Preferred clays are the synthetic clays comprising one or more montmorillonite type materials such as ben-tonite or hectorite.
Thus, especially preferred syn~hetic clays are:
1. Those sold as Laponite ~Trade Mark) clays, which are synthe-tic hectorites and which comprise a magnesium silica-te containing lithium, and Eluorine or hydroxide groups in a layered structure, and which are available rom Laporte Industries Limited;
2. Those known as "specially produced" montmorillonito clays, for example, that sold under the Trade Mark Bentone El~ and availnble from Steetley Chemicals, and whicll is a magnesium montmorillonite ~hydrous magnesium silicate); and
3. Combinations thereof.
rhe amount o~ gelling agent used is selected on the ~asis of the thickness required ~or the composition having regard to the requirement ~or brush application and the properties of tlle particular gelling agent used. Generally, the gelling agents will not be used in concentrations in excess of about 10% by weight, wllile a convenient lower limit is about 0.5% by weight, based on the total weigllt of the composition. Preferably, however, the gelling agents are employed in amowlts o~ ~rom about 2.0%
to about ~.0% by WCig]lt of clay and about 1.0% to about 2.0% by weight o~
gum, the ratio of clay to gum being in the rnnge o~ from about 5:1 to - 6 ~ 3~7~
just above l:l.
Ihe compositions of the invention may also include other in-~redients employed in pain-t stripping compositions such as wetting agents, dycs, pigments and water-miscible organic solv~nts. All such additional ingrcdicnts must of coursc be compatible with the other essential ingred-iCI1ts, and in particular must be compati~le with the alkalinity of the compositions, as well as being water-miscible. The selection of these convel1tiol1al ingredients and suitable concentrations for them is believed to bc withil1 tho competence of the man skilled in the ar~.
Preferably, where a pigment is employed, it is used in an amount such tha-t the stripper, when applied at the thickness necessary ~o achieve a desired stripping ef~ect, iust obscures the underlying paint layer.
In use the compositions of the invention are applied to a painted surface usin~ a brush having alkali resistantsynthetic bristles, e.g. of nylon or polypropylene - not animal bristle - typically as a plural-ity of separately applied layers. The composition is then left until the paint has been softened; typically this will be a period of from about l to about 6 hours, although longer periods of contact may be desirable when many coats of paint are to be removed.
2~ The layer of composition is then removed as a semi-peelable skin using a scrapor, pallet knife or similar tool, although actual scraping oE thc undorlying surfacc should no-t be necessary. The skin is liEted away frolll tllo surfacc together with the softened paint, and complex shapes can bc rca~ily stripped without having to scrape paint from every crevice.
1'hc compositions of the invention have been described above in thoir ready-to-use Eorm. It is to be understood, however, that the com-positions of the invention may be produced for distribution and sale in dry powder form. Accordingly, the present invention in anotl1er aspect providos a composition in dry powder form which when mixed with water can form a spreadable aqueous paint stripper composition as describe~ herein.
~ 7 - ~ ~3~
The dry powder composition may be the same as the spreadable aqueous composition, except for the inclusion of water. However, since at least some of the alkali materials described above may not be conveniently harldled in dry form, it may be preferred to formulate the dry composition wi~h a Illixture of calcium hydroxide (lime) and an alkali metal salt, the an:ion ot which forms an insoluble salt with calcium. The ingredients of such a mixture when mixed with water provide an alkali metal hydroxide e.g.
sodium hydroxide, but when in dry -Eorm are more easily handled than the corresponding alkali metal hydroxide.
Preferably, the alkali metal salt and the calcium hydroxide are employed in substantially stoichiometric amounts, the percentage of each in the dry composition being such as to provide a corresponding percentage of alkali metal hydroxide in accordance with the above description, preferably about 5 to about 12% by weight of hydroxide.
Preferably the dry powder composition includes a mixture of lime and sodium carbonate to provide sodium hydroxide when mixed with water.
- 8 - ~2~
The following Examples illustrate compositions in accordance with the invention and their use.
Example 1 A composition was prepared from the following ingredients:
%w/w Water 70.10 Caustic Soda 48~ w/w solution. 25.00 Laponite*S (Synthetic thickening clay) 3.25 K 9 C 57 (Development xanthan gum from Relco Inc., U.S.A. supplied by Alginate Industries Limited) 1.~5 100.00 A panel was prepared with ten cozts of commercial alkyd gloss paint and aged for several months to allow the paint to become mature. The above composi~ion was applied using a polypropvlene brush to obtain a thick layer. After ten minutes, a further layer was applied above the flrst layér using a "cross hatch" technicue.
The panel was dis?osed with the coated surface vertical and after two hours it was found that a flexible dry coherent skin had formed which could easily be removed intact with a pallet knife. During the two hour period little or no "running" was observed from the vertical panel, and when the ?anel was washed down with a wet cloth it was found that all ten coats of paint had been removed.
In addition it was Eound that the formulation was *Trade Mark stable for prolonged periods and afforded an acceptable shelf-life. Also, it not only possessed film-forming properties but had sufficient thixotropy to remain in place when coated on an inverted surface.
Example 2 A composition was prepared from the following ingredients:
% w/w Water 70.10 Caustic Soaa 48%
w~w solution 25.00 Bentsne* EW (Svnt~e~ic thickeninq clay) 3.25 20 K 9 C 57 (xanthan gum~ 1.65 10 0 . o o In use, results were obtained similar to those described above Eor the composition of Example 1.
*'I'ra~l~ M~rk
rhe amount o~ gelling agent used is selected on the ~asis of the thickness required ~or the composition having regard to the requirement ~or brush application and the properties of tlle particular gelling agent used. Generally, the gelling agents will not be used in concentrations in excess of about 10% by weight, wllile a convenient lower limit is about 0.5% by weight, based on the total weigllt of the composition. Preferably, however, the gelling agents are employed in amowlts o~ ~rom about 2.0%
to about ~.0% by WCig]lt of clay and about 1.0% to about 2.0% by weight o~
gum, the ratio of clay to gum being in the rnnge o~ from about 5:1 to - 6 ~ 3~7~
just above l:l.
Ihe compositions of the invention may also include other in-~redients employed in pain-t stripping compositions such as wetting agents, dycs, pigments and water-miscible organic solv~nts. All such additional ingrcdicnts must of coursc be compatible with the other essential ingred-iCI1ts, and in particular must be compati~le with the alkalinity of the compositions, as well as being water-miscible. The selection of these convel1tiol1al ingredients and suitable concentrations for them is believed to bc withil1 tho competence of the man skilled in the ar~.
Preferably, where a pigment is employed, it is used in an amount such tha-t the stripper, when applied at the thickness necessary ~o achieve a desired stripping ef~ect, iust obscures the underlying paint layer.
In use the compositions of the invention are applied to a painted surface usin~ a brush having alkali resistantsynthetic bristles, e.g. of nylon or polypropylene - not animal bristle - typically as a plural-ity of separately applied layers. The composition is then left until the paint has been softened; typically this will be a period of from about l to about 6 hours, although longer periods of contact may be desirable when many coats of paint are to be removed.
2~ The layer of composition is then removed as a semi-peelable skin using a scrapor, pallet knife or similar tool, although actual scraping oE thc undorlying surfacc should no-t be necessary. The skin is liEted away frolll tllo surfacc together with the softened paint, and complex shapes can bc rca~ily stripped without having to scrape paint from every crevice.
1'hc compositions of the invention have been described above in thoir ready-to-use Eorm. It is to be understood, however, that the com-positions of the invention may be produced for distribution and sale in dry powder form. Accordingly, the present invention in anotl1er aspect providos a composition in dry powder form which when mixed with water can form a spreadable aqueous paint stripper composition as describe~ herein.
~ 7 - ~ ~3~
The dry powder composition may be the same as the spreadable aqueous composition, except for the inclusion of water. However, since at least some of the alkali materials described above may not be conveniently harldled in dry form, it may be preferred to formulate the dry composition wi~h a Illixture of calcium hydroxide (lime) and an alkali metal salt, the an:ion ot which forms an insoluble salt with calcium. The ingredients of such a mixture when mixed with water provide an alkali metal hydroxide e.g.
sodium hydroxide, but when in dry -Eorm are more easily handled than the corresponding alkali metal hydroxide.
Preferably, the alkali metal salt and the calcium hydroxide are employed in substantially stoichiometric amounts, the percentage of each in the dry composition being such as to provide a corresponding percentage of alkali metal hydroxide in accordance with the above description, preferably about 5 to about 12% by weight of hydroxide.
Preferably the dry powder composition includes a mixture of lime and sodium carbonate to provide sodium hydroxide when mixed with water.
- 8 - ~2~
The following Examples illustrate compositions in accordance with the invention and their use.
Example 1 A composition was prepared from the following ingredients:
%w/w Water 70.10 Caustic Soda 48~ w/w solution. 25.00 Laponite*S (Synthetic thickening clay) 3.25 K 9 C 57 (Development xanthan gum from Relco Inc., U.S.A. supplied by Alginate Industries Limited) 1.~5 100.00 A panel was prepared with ten cozts of commercial alkyd gloss paint and aged for several months to allow the paint to become mature. The above composi~ion was applied using a polypropvlene brush to obtain a thick layer. After ten minutes, a further layer was applied above the flrst layér using a "cross hatch" technicue.
The panel was dis?osed with the coated surface vertical and after two hours it was found that a flexible dry coherent skin had formed which could easily be removed intact with a pallet knife. During the two hour period little or no "running" was observed from the vertical panel, and when the ?anel was washed down with a wet cloth it was found that all ten coats of paint had been removed.
In addition it was Eound that the formulation was *Trade Mark stable for prolonged periods and afforded an acceptable shelf-life. Also, it not only possessed film-forming properties but had sufficient thixotropy to remain in place when coated on an inverted surface.
Example 2 A composition was prepared from the following ingredients:
% w/w Water 70.10 Caustic Soaa 48%
w~w solution 25.00 Bentsne* EW (Svnt~e~ic thickeninq clay) 3.25 20 K 9 C 57 (xanthan gum~ 1.65 10 0 . o o In use, results were obtained similar to those described above Eor the composition of Example 1.
*'I'ra~l~ M~rk
Claims (20)
PROPERTY OR PRIVELEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An aqueous paint stripper composition suitable for brush application, which composition comprises an alkali in an amount such that the composition is capable of stripping alkyd-based gloss paint, together with a mixture of a clay gelling agent and a gum gelling agent in aqueous dispersion, the ratio of clay to gum being in excess of 1:1 on a weight basis.
2. A composition according to claim 1, which has a pH of at least 10 .
3. A composition according to claim 1 or claim 2, wherein the alkali is an alkali metal hydroxide.
4. A composition according to claim 2, wherein the alkali is sodium or potassium hydroxide.
5. A composition according to claim 4, which contains from about 5%
to about 12% by weight of sodium hydroxide.
to about 12% by weight of sodium hydroxide.
6. A composition according to claim 1, 2 or 5, wherein the gum gell-ing agent is a xanthan gum.
7. A composition according to claim 1, 2 or 5, wherein the clay gelling agent is a synthetic clay comprising one or more montmorillonite type materials.
8. A composition according to claim 1, 2 or 5, wherein the clay gelling agent is a specially produced montmorillonite clay, a synthetic hectorite clay or a mixture thereof.
9. A composition according to claim 1, 2 or 5, wherein the gum gelling agent is a xanthan gum and wherein the clay gelling agent is a specially produced montmorillonite clay, a synthetic hectorite clay or a mixture thereof.
10. A composition according to claim 1, 2 or 5, which contains up to about 10% by weight of said gelling agents.
11. A composition according to claim 1, 2 or 5, which contains from about 2.0% to about 4.0% by weight of clay.
12. A composition according to claim 1, 2 or 5, which contains about 1.0% to about 2.0% by weight of gum.
13. A composition according to claim 1, 2 or 5, wherein the weight ratio of clay to gum is from about 5:1 to just above 1:1
14. A composition according to claim 1, 2 or 5, which contains up to about 10% by weight of said gelling agents and wherein the weight ratio of clay to gum is from about 5:1 to just above 1:1.
15. A composition according to claim 1, 2 or 5, which contains from about 2.0% to about 4.0% by weight of clay, and about 1.0% to about 2.0% by weight of gum.
16. A composition in dry powder form which when mixed with water can form a brushable aqueous paint stripper composition according to claim 1, 2 or 5.
17. A composition in dry powder form which can be mixed with water to from a brushable aqueous paint stripper composition, which composition com-prises calcium hydroxide and an alkali metal salt the anion of the alkali metal salt being one which forms a water-insoluble salt with calcium , to provide alkali in an amount such that the aqueous stripper is capable of stripping an alkyd-base gloss paint, together with a mixture of a clay gelling agent and a gum gelling agent, the ratio of clay to gum being in excess of 1:1 of a weight basis.
18. A composition according to claim 17, wherein the calcium hydroxide and the alkali metal salt together provide from about 5% to about 12% by weight alkali metal hydroxide in the aqueous stripper.
19. A composition according to claim 17 or 18, wherein the alkali metal salt is sodium carbonate.
20. A composition according to claim 17 or 18 comprising calcium hydroxide and sodium carbonate in substantially stoichiometric proportions and in amounts sufficient to provide about 5% to about 12% by weight of sodium hydroxide when the composition is mixed with water to provide a brushable aqueous paint stripper composition, said dry composition also including a synthetic clay comprising one or more montmorillonite type materials, and xanthan gum.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB83-29172 | 1983-11-01 | ||
| GB08329172A GB2148925A (en) | 1983-11-01 | 1983-11-01 | Brush-applied alkali-based paint stripping compositions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1236760A true CA1236760A (en) | 1988-05-17 |
Family
ID=10551060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000466672A Expired CA1236760A (en) | 1983-11-01 | 1984-10-31 | Brush applied alkali-based paint stripper compositions |
Country Status (4)
| Country | Link |
|---|---|
| AU (1) | AU570737B2 (en) |
| CA (1) | CA1236760A (en) |
| GB (1) | GB2148925A (en) |
| NZ (1) | NZ209964A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ZA892946B (en) * | 1988-04-22 | 1989-12-27 | Loncar Anthony Mathew | Chemical composition |
| ES2120331B1 (en) * | 1995-05-17 | 1999-07-01 | Casanova Cubel Adelaida | PROCEDURE FOR THE PREPARATION OF A PRODUCT TO ELIMINATE INTERIOR PLASTERS AND PRODUCT OBTAINED. |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU8260275A (en) * | 1974-06-26 | 1977-01-06 | Poels M P | Paint strippers |
| GB2069522B (en) * | 1980-02-15 | 1983-06-22 | Sterwin Ag | Paint strippers |
| NZ196212A (en) * | 1980-02-15 | 1983-09-02 | Sterling Drug Inc | Paint stripper composition |
-
1983
- 1983-11-01 GB GB08329172A patent/GB2148925A/en not_active Withdrawn
-
1984
- 1984-10-23 NZ NZ20996484A patent/NZ209964A/en unknown
- 1984-10-23 AU AU34582/84A patent/AU570737B2/en not_active Ceased
- 1984-10-31 CA CA000466672A patent/CA1236760A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NZ209964A (en) | 1987-05-29 |
| AU3458284A (en) | 1985-05-09 |
| GB2148925A (en) | 1985-06-05 |
| GB8329172D0 (en) | 1983-12-07 |
| AU570737B2 (en) | 1988-03-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |