Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1995-04-27
1998-12-15
McCamish, Marion
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524310, 524311, 524312, 524313, 524322, 524556, 524558, 106 3, C08L 9100
Patent
active
058498389
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an aqueous emulsion scratch cover composition for covering scratches in finished wooden furniture and other finished wooden articles that is substantially free of added volatile organic solvents and water-sensitive surfactants. The compositions are based upon a combination of an oil, a dye, optionally, a pigment, a wax or a silicone polymer, and a specific type of polymeric electrostatic emulsifier to obtain scratch cover compositions with appearance characteristics of the same order as conventional volatile organic solvent-based scratch cover compositions.
BACKGROUND ART
As the world becomes more ecologically conscious of the potential environmental harm done by volatile organic solvent-based products that release volatile organic solvents into the atmosphere, there is a greater desire to obtain substantially solvent-free compositions to replace such products. Unfortunately, the substitution of water-based compositions for solvent-based compositions in products often sacrifices favorable properties or increases the cost of such products because expensive materials or methods of manufacturing water-based products are required.
This is true in the field of scratch cover compositions for finished wooden furniture and similar finished wooden articles such as wooden trim, floors, decking and the like which are finished with transparent or translucent finishes which allow the natural beauty of the wood to be seen. The objective of such compositions is to get a dye into the wood beneath the scratch, blemish or other damaged area.
Traditional scratch cover compositions such as OLD ENGLISH.RTM. Scratch Cover sold by Reckitt & Colman Household Products of Wayne, N.J., USA rely on volatile organic solvents and oils to carry a dye into the wood. Another example of a conventional volatile organic solvent-based scratch cover composition is described in U.S. Pat. No. 2,687,963 to Marshall. Marshall teaches a combination scratch cover and polish formulation composed of paraffin oil, wax, coating material and a vehicle that may be a lacquer, varnish or other volatile organic solvent such as lacquer thinner, a lower aliphatic alcohol of from 1 to 6 carbon atoms or a naphthenic base oil.
Another type of conventional scratch cover composition is sold under the trademark SCRATCH COAT.RTM. by Fast Industries, Inc. of Fort Lauderdale, Fla., USA that is said to be a dye-free oil composition that is said to match scratches in all woods. Yet another commercial composition sold by Johnson Wax Espanola, S.A. of Madrid, Spain under the trademark PRONTO.RTM. Reparador is composed of mineral oil, nonionic surfactant, dyes, and fragrance.
Simply converting a volatile organic-solvent-based composition over to a water-based composition by removing the solvent and addition of a surfactant to provide water dispersibility is not an adequate remedy. The resulting aqueous composition is typically not as durable as its volatile organic solvent-based counterpart. This is due to the need for a water-sensitive surfactant to disperse or emulsify the ingredients into water. The surfactant remains in the film left behind on the wood and can result in removal of the scratch repair film when the furniture is cleaned with an aqueous polish composition or an aqueous detergent solution. Additionally, the presence of the water in the scratch cover composition can interfere with ability of the wood to properly absorb the oil-based dyes and pigments used to cover the damaged wood. Aqueous emulsion scratch cover compositions also can have stability problems and thus a significant amount of surfactant must usually be added to retain product stability. That added surfactant further increases the water sensitivity of the resulting film left behind in the scratched wood.
Although some scratch cover compositions do not contain much, if any, volatile organic solvents, they must still be cleaned up with volatile organic solvents. A water-based product would be easier to clean up without such solvents.
Thus, there is stil
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Guarriello John J.
McCamish Marion
S. C. Johnson & Son Inc.
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