| PATENT NUMBER | This data is not available for free |
| PATENT GRANT DATE | March 11, 2003 |
| PATENT TITLE |
Ready to use spackle/repair product containing dryness indicator |
| PATENT ABSTRACT | A ready to use patch repair product is disclosed that includes a color change indicator therein. After the product has dried the color changes to signal that, if desired, the worker can perform other operations such as painting, sanding, etc on the surface. In one aspect of the invention, a substantially ammonia and ammonium salt free latex polymer is used as the resin binder component. This provides enhanced color stability in the stored product |
| PATENT INVENTORS | This data is not available for free |
| PATENT ASSIGNEE | This data is not available for free |
| PATENT FILE DATE | April 2, 2002 |
| PATENT CT FILE DATE | May 4, 2000 |
| PATENT CT NUMBER | This data is not available for free |
| PATENT CT PUB NUMBER | This data is not available for free |
| PATENT CT PUB DATE | November 9, 2000 |
| PATENT PARENT CASE TEXT | This data is not available for free |
| PATENT CLAIMS |
What is claimed is: 1. Patch repair composition comprising resin binder, pigment, and a pH color change indicator, said composition further having a pH of about 11-13. 2. Patch repair composition comprising 0-10 wt % surfactant, 0-10 wt % thickener, 0-10 wt % freeze thaw agent, 1-50 wt % resin binder, 1-80 wt % pigment, about 10 to about 50% water, about 0-80 wt % filler, about 0.1-10 wt % pH adjustment agent; and a pH color change indicator present in an amount of 0.00001-10%; with the foregoing percentages adding up to 100 wt %. 3. Patch repair composition comprising resin binder, pigment and a pH color change indicator, said resin binder comprising an ammonia and ammonium salt free polymer latex, said composition further having a pH of about 11-13. 4. Patch repair composition comprising 0.05-5.0 wt % surfactant, 0.1-5.0 wt % thickener, 0.1-2.0 wt % freeze-thaw agent, 1-50 wt % resin binder, 40-80 wt % pigment, 15-40 wt % water, 1-20 wt % filler, 0.25-5 wt % pH adjustment agent and about 0.001-5 wt % pH color change indicator with the foregoing percentages adding up to 100 wt %. 5. In a patch repair composition comprising resin binder and pigment, the improvement wherein said resin binder comprises a member selected from (I) polyvinylesters and derivatives of said polyvinylesters and (II) acrylic resin binders, said resin binder being in latex form and having substantially no NH.sub.3 or ammonium salts in said latex; said composition further having a pH of about 11-13 and comprising a pH color change indicator possessing color when maintained at an alkaline pH and losing color upon drying of said composition. 6. Composition as recited in claim 5 wherein said resin binder is an acrylic resin binder and said pH color change indicator comprises a member selected from the group consisting of ortho-cresolphthalein; ethyl bis(2,4-dinitrophenyl)acetate; p-nitrophenol; -nitrophenol; m-dinitrophenol; 1,3,5-trinitrophenol; 2,4,6-trinitrophenol; phenolpthalein (PTL); and thymolphthalein. 7. Composition as recited in claim 6 wherein said resin binder comprises as a polymer component a copolymer comprising butyl acrylate and methyl methacylate repeat units. 8. Composition as recited in claim 7 wherein said copolymer further comprises methacrylic acid repeat units. 9. Composition as recited in claim 6 wherein said resin binder comprises as a polymeric component butyl acrylate (BA)/methyl methacrylate (MMA)/methacrylic acid (MA) repeat units; said BA present in a molar amount of about 40-60%, said MMA present in a molar amount of about 40-60%, and said MA present in a molar amount of about 0-5%, based on the total amount of said polymeric component. 10. Composition as recited in claim 6 wherein said color change indicator comprises PTL. 11. A method of treating imperfections and the like existing in building member surfaces comprising: applying to said surface an amount effective for the purpose of an aqueous patch repair composition comprising, resin binder, pigment, and a pH color change indicator, said aqueous patch repair composition possessing color when applied; and allowing said composition to dry whereby said color dissipates from said composition. 12. A method as recited in claim 11 wherein said aqueous patch repair composition has a basic pH when applied. 13. A method as recited in claim 12 wherein said aqueous patch repair composition comprises as its resin binder a member selected from (I) polyvinyl esters and derivatives of said polyvinyl esters and (II) acrylic resin binders, and wherein said resin binder is in latex form with substantially no NH.sub.3 or ammonium salts in said latex. 14. A method as recited in claim 13 wherein said pH color change indicator comprises a member selected from the group consisting of ortho-cresolphthalein; ethyl bis(2,4-dinitrophenyl)acetate; p-nitrophenol; m-nitrophenol; m-dinitrophenol; 1,3,5-trinitrophenol; 2,4,6-trinitrophenol; phenolpthalein (PTL); and thymolphthalein, said aqueous patch repair composition further having a pH of about 11-13. 15. A method as recited in claim 13 wherein said resin binder is an acrylic resin binder (II) comprising as a polymer component a copolymer comprising butyl acrylate and methyl methacrylate repeat units. 16. A method as recited in claim 15 wherein said copolymer further comprises methacrylic acid repeat units. 17. A method as recited in claim 16 wherein said resin binder comprises as a polymeric component butyl acrylate (BA)/methyl methacrylate (MMA)/methacrylic acid (MA) repeat units; said BA present in a molar amount of about 40-60%, said MMA present in a molar amount of about 40-60%, and said MA present in a molar amount of about 0-5%, based on the total moles of repeat units present in said polymeric component. 18. A method as recited in claim 17 wherein said pH color change indicator comprises PTL. -------------------------------------------------------------------------------- |
| PATENT DESCRIPTION |
FIELD OF THE INVENTION The invention relates to a spackling/repair product or powder that produces a color while containing water. After the product is applied and the product dries, the color changes from either red or blue to white. BACKGROUND OF THE INVENTION Spackling compounds, joint compounds and patch repair products have been used for years to provide the desired smooth or textured coating over imperfections in building members such as wall board, plaster and other construction surfaces. Typically. these compounds comprise a resinous binder, limestone, clay, lubricant, stabilizers and thickeners that are mixed with water to provide a paste like product. The paste like product is applied to the desired building member substrate with a trowel or other tool. The product hardens via drying so that the construction worker can then perform other desired operations over the thus hardened product such as sanding, taping, painting, etc. So as to provide a clear indication to the construction worker that the surface is ready for performance of such additional operations, it is desirable that the spackle, joint compound or repair product contain a color indicator whereby color of the product changes after the applied product has dried. While the provision of a color change indicator in such a product would superficially appear to be an easy task, the problem is made much more complex by the additional requirement that the product must be color stable during its anticipated inventory or shelf life. Accordingly, there is an even more specific need for a hardenable spackle/repair product that will change color upon drying while exhibiting enhanced color stability during long storage periods. SUMMARY OF THE INVENTION In accordance with the invention a ready to use product or powder is provided containing a color change agent that produces a color while containing water. After the product is applied, and the product dries, the color changes, preferably from either red or blue to white. This product indicates when the applied product has dried. This allows for sanding, painting or re-application at the proper time for maximum performance. All the problems associated with post-application performance due to incomplete drying of the compound can be avoided. Color change indicators that have been evaluated include phenolphthalein (red) and thymolphthalein (blue). These well-known indicators may change color after an alkaline mixture or solution containing same approaches neutrality. Also indicators can change color when water is lost. Water loss leads to the insolubility and precipitation of indicator solids which are colorless. One specific formulation that has been tested is as follows: SAMPLE RAW MATERIAL WT % 2500 Grams Pluronic F-68 0.1000 2.5 Water 14.0500 351.25 Premix then Add CMC 7H 0.2500 6.25 Ethylene Glycol 0.5000 12.5 Mix Thoroughly UCAR 412 6.0000 150 Mix Thoroughly Vicron 45-3 71.2000 1780 Mix Thoroughly Premix Then Add Water 4.08975 122.4375 Attagel 40 1.0000 25 Premix Then Add Water 1.5000 37.5 45% KOH 0.5000 12.5 Add Phenolphthalein 0.0025 0.0625 W/o Preservative 0.0000 0 100.0000 2500 Pluronic F-68-Polyoxyalkylene glycol block copolymer; available BASF CMC 7H-Carboxymethylcellulose; available Hercules UCAR 412-Butyl acrylate/methyl methacrylate/methacrylic acid terpolymer; pH (8-9); available Union Carbide Vicron 45-3-Ground limestone Attagel 40-Attapulgus clay; available Engelhardt The product is colored red to pink and turns white upon drying. The pH of the above formula is preferably about 11-13 to promote enhanced stability of indicator color during the product application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT In general, the color change patch repair or joint or spackling compositions comprise surfactant, water retained agent, free-thaw agent, resin binder, pigment, filters, pH adjustment agent and the desired color change indicator. As used throughout these compositions are referred to generically as "patch repair" compounds. As to the surfactants that can be used, these can be chosen from a variety of commercially available compounds. These include the ethoxylated alkyl phenols, such as the Triton.RTM. products available from Union Carbide, the Tamol.RTM. products available from Rohm & Haas and the polyoxyalkylene glycol block polymers available for example from BASF. The water retaining agent or thickener is preferably a cellulosic ether such as carboxymethylcellulose CMC, hydroxyethylmethylcellulose (HEC), hydroxypropylmethylcellulose, alkali swellable and/or associative thickeners, etc. All of these are commercially available. The preferred thickeners are available from Aqualon, Wilmington Del. with the CMC 7H and Natrosol products particularly preferred. The freeze thaw agent is normally ethylene glycol, although glycols in general can be mentioned. The resinous binder component can be chosen from the groups of (I) polyvinyl esters and polymers derived therefrom and/or (II) acrylic resin binders. Exemplary binders falling within the designation (I) include poly(vinyl acetate), poly(vinyl alcohol); polyvinyl (butyral); poly(vinyl chloride) etc. Exemplary binders falling within the group (II) designation include acrylic polymers and copolymers. Usually, these contain copolymerized acrylic unsaturated monomers preferably copolymerized with other ethylenically unsaturated monomers. Acrylic unsaturated monomers include lower alkyl esters of acrylic or methacrylic acid having an alkyl ester portion containing between 1 to 12 carbon atoms as well as aromatic derivatives of acrylic and methacrylic acid. Useful acrylic monomers include, for example, acrylic and methacrylic acid, methyl acrylate and methacrylate, ethyl acrylate and methacrylate, butyl acrylate and methacrylate, propyl acrylate and methacrylate, 2-ethyl hexyl acrylate and methacrylate, cyclohexyl acrylate and methacrylate, decyl acrylate and methacrylate, isodecylacrylate and methacrylate, benzyl acrylate and methacrylate, and various reaction products such as butyl, phenyl, and cresyl glycidyl ethers reacted with acrylic and methacrylic acids, hydroxy alkyl acrylates and methacrylates such as hydroxyethyl and hydroxypropyl acrylates and methacrylates, as well as amino acrylates and methacrylates. The acrylic monomers are preferably copolymerized with ethylenically unsaturated monomers other than acrylic monomers. Ethylenically unsaturated monomers other than said acrylic unsaturated monomers can include, for example, those monomeric materials exhibiting ethylenic double bond unsaturation such as polymerizable vinyl, allylic, fumaric, maleic, or like ethylenically unsaturated double bond functionality (carbon-to-carbon unsaturation) which can be copolymerized with the acrylic double bond unsaturation in said acrylic unsaturated monomers. Ethylenically unsaturated monomers can include, for example, styrene alpha-methyl styrene and substituted alkyl styrenes, chlorostyrene, vinyl toluene, vinyl naphthalene, dibutyl maleate, butadiene, vinyl chloride, vinylidene chloride, acrylamide and acrylonitrile and similar ethylenically unsaturated monomers. The ethylenically unsaturated monomers can be copolymerized with said monomers containing acrylic unsaturation by free radical induced addition polymerization using peroxy or azo catalysts, common redox catalysts, ultraviolet radiation, or the like. The acrylic copolymer of this invention can be synthesized by adding a monomer mixture over a period of time to an aqueous polymerization medium in the presence of a free radical initiator or azo catalyst to produce an acrylic latex copolymer. Ordinarily about 1-2% peroxide initiators based on the monomer weight is used in the polymerization of monomers. At present, and in order to impact enhanced color stability to the product, it is preferred to use a resin binder latex that has substantially no NH.sub.3 or ammonium salts contained in the latex. Most preferred is UCAR latex 412 which includes as the main polymeric component: butyl acrylate(BA)/methyl methacrylate (MMA)/methacrylic acid (MA) polymer. The BA repeat unit may be present in a molar amount of about 40-60% with the MMA present in an amount of about 40-60% and the MA present in an amount of about 0-5%. This particular latex comprises about 45 wt % polymer solids and water in an amount of about 53 wt %. In addition, it contains minor amounts of preservative, an anti-foam agent, anionic stabilizers and residues from free radical initiators. No ammonia or ammonium salts are used in the manufacture of this product. A nonylphenoxy poly(ethyleneoxyl)ethanol surfactant is reputedly present in this latex product in an amount of about 2 wt %. Referring next to the pigments, these can be chosen from a variety of compounds including ground limestone, TiO.sub.2, satin white, etc. Fillers such as fibers, glossy spheres, pearlites, vermiculites, talc, clays, etc., can also be added. PH adjustment agents such as NaOH, KOH, K.sub.2 CO.sub.3 and other bases can be used to regulate pH of the product to preferably, alkalinity. Exemplary color change agents include phenolpthalein (reddish pink) (PTL) and thymolphthalein (blue) as set forth above. Additionally, ortho-cresolphthalein (red), ethyl bis(2,4-dinitrophenyl)acetate (blue-green), p-nitrophenol (yellow), m-nitrophenol (yellow), m-dinitrophenyl (yellow), 1,2,5-trinitrophenol (orange), and 2,4,6-trinitrophenol (orange) may be mentioned. These color indicators possess color when maintained at an alkaline pH then lose color upon drying of the product. Exemplary compositions are as follows: surfactant 0-10% thickeners 0-10% freeze-thaw 0-10% resin binder 1-50% pigments 1-80% water 10-50% fillers 0-80% pH adjustment agent .01-10% color change indicator 0.00001-10% (The foregoing add up to 100 wt %) Preferred compositions are as follows: surfactant .05-5.0% thickeners .1-5.0% freeze-thaw .1-2.0% resin binder 1-50.00% pigments 40-80.00% water 15-40.00% fillers 1-20% pH adjustment agent .25-5% color change indicator .001-5% (The foregoing add up to 100 wt %) The compositions most preferred at this time (i.e., best mode) is as follows: water 18.48 wt % surfactant Tamol 850 0.57 wt % Pluronic F68 0.21 wt % clay attagel 40 1.92 wt % calcium carbonate microwhite 100 42.14 wt % vicron 45-3 20.73 wt % thickeners CMC 7H 0.06 wt % Natrosol 250* 0.13 wt % pH adjustment cmpd. K.sub.2 CO.sub.3 (45%) 0.34 wt % freeze-thaw ethylene glycol 0.99 wt % color indicator PTL 0.02 wt % * -modified hydroxylethylcellulose--Aqualon Div. Hercules pH=11.8-12.8; density 14.8-15.00 lbs/gal; color=pink In accordance with the invention, the artisan applies the repair composition to the requisite structural surface and, with the aid of a trowel or other tool, provides a smooth or textured surface. As applied, the product is in its colored (e.g. pink when PTL is used as the color indicator) state. Upon drying, the color changes to white thereby indicating to the artisan that additional treatments etc. may be performed on the thus treated surface. The invention will be further described in the following illustrative examples which are not to be construed to limit the invention. In the examples the following product identifications are used, in addition to those reported above. U CAR 353--Union Carbide; vinyl acetate/butylacrylate latex U CAR 413--Union Carbide; butyl acrylate/methyl methacrylate methacrylic acid latex |
| PATENT EXAMPLES | available on request |
| PATENT PHOTOCOPY | available on request |
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