Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Reexamination Certificate
1998-12-23
2001-04-24
Bell, Mark L. (Department: 1755)
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
C106S436000, C106S447000
Reexamination Certificate
active
06221145
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to the production of an aqueous paint from a plurality of premixed compositions which include a pigment, a dispersant thickening agent, and low resin content and high resin content aqueous components.
The traditional manufacture of paint has utilized processes which continuously fill containers with a neutral or base color at the central facility. The containers are transported to the point of sale and stored until resale. The transport and storage in the individual containers adds significantly to the cost of the sold product for it is necessary to inventory a wide variety of paints having different finish characteristics to satisfy consumer demand. For example, the finishes offered for sale range from the traditional flat paint through varying resin compositions up to a high gloss finish. Inventory is maintained for all the different finishes at the point of sale by the merchant.
The manufacture of point at the central facility can be either a batch process or an extended continuous mixing process. The process typically calls for mixing a pigment containing ground titanium dioxide along with a thickener, a viscosity controlling agent and resin added to the water base. The pigment composition is a composition with a high percentage of solids suspended in water. Storage for any significant period of time of a premixed pigment composition typically results in settling and a non-uniform distribution of constituents throughout the premix. Consequently, manufacturing process are designed to limit the residence time in premixing containers in order to promote the manufacture of more uniform products.
The present invention is directed to the provision of premixed aqueous compositions which can be used to provide a paint mixture of varying finish characteristics at the point of sale. Thus, the merchant distributing the paint composition made from the subject premixed compositions need only maintain inventory of four compositions. The particular compositions which are the subject of the invention exhibit stable characteristics during storage in their respective reservoirs.
SUMMARY OF THE INVENTION
This process utilizes a plurality of aqueous compositions to provide the opportunity to mix the full range of finishes at the point of sale. The compositions include a pigment composition, a dispersant-thickening agent, a high resin content binder and a low resin content binder. From these four compositions, the process enables the seller to use from two to four of the premixed compositions to create flat, satin, low sheen, semi-gloss up to high gloss finishes. The pigment composition is common to all combinations and is characterized by the use of a combination dispersant-thickener, a mixture of clay and silica and a viscosity controlling agent along with water and finely-divided titanium dioxide.
The pigment composition contains the titanium dioxide in the range of 40 to 50 percent by weight and the water is about 25 percent by weight of the composition. The clay-silica mixture is about 15 percent and serves to maintain the suspension. The viscosity controlling agent is added at about 10 percent. The combination of dispersant and thickener is added at less than 5 percent and enables the premixed pigment composition to maintain a uniform distribution of the solid throughout its volume.
The second component is an aqueous composition used primarily as a dilutant and contains a dispersant, a thickener and a coalescent. The second component is combined with the pigment composition for all desired finishes with the exception of a high gloss finish. The high resin component is predominantly resin at about 80 percent. The low resin component contains more water with the resin in the 45 to 50 percent range. Between one and three components are combined with the pigment composition to provide the various finishes at the point of sale.
REFERENCES:
patent: 3956206 (1976-05-01), Sellars et al.
patent: 4373930 (1983-02-01), Rothwell
patent: 5521234 (1996-05-01), Brown et al.
patent: 5773752 (1998-06-01), Blume et al.
patent: 5877234 (1999-03-01), Xu et al.
patent: 5989331 (1999-11-01), Bauer et al.
patent: 6074474 (2000-06-01), Broome et al.
patent: 59-172559 (1984-09-01), None
Bell Mark L.
Coating Management Systems, Inc.
DiVerdi Michael J.
Schmeiser Albert L.
Schmeiser Olsen & Watts
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