Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Compositions to be polymerized by wave energy wherein said...
Reexamination Certificate
2001-07-18
2003-06-24
Nutter, Nathan M. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Compositions to be polymerized by wave energy wherein said...
C522S075000, C522S079000, C522S103000, C522S182000, C522S904000, C522S905000
Reexamination Certificate
active
06583195
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention pertains to coating compositions. More particularly, the present invention concerns UV curable coating compositions. Even more particularly, the present invention concerns UV curable coating compositions particularly adapted for the treatment and protection of porous exterior structures made from wood, concrete, stone, ceramic, and other porous construction materials, which may be exposed to weathering and/or insect damage.
2. Prior Art
As is known to those skilled in the art to which the present invention pertains, the average homeowner spends thousands of dollars installing and maintaining exterior structures, such as wooden decks, wooden siding, wooden roofs, wooden doors, wooden windows, wooden shutters, concrete/asphalt driveways, sidewalks and the like, and, thereafter, watch their investment deteriorate from lack of sufficient protection from the environment and/or insects. Present day film forming exterior finishes and treatments such as paints, stains, sealers and the like simply lack significant service life for the protection of exterior surfaces, such as those enumerated above, from weathering and/or attack by biological factors.
It is well known through investigative studies performed by the United States Department of Agriculture's Forestry Products Division, that exterior wooden surfaces are structurally dynamic materials which react directly to the immediate surrounding environment. These dynamic structural properties that exterior wooden surfaces exhibit have been identified to be the most significant factor contributing to the failure of film forming exterior paints/coatings/stains on exterior wood surfaces. Simply stated, exterior wood expands and contracts in reaction to changes in humidity and temperature making long term adhesion of currently available protective film forming finishes difficult, if not impossible.
Furthermore, exposed (untreated) exterior wooden structures are susceptible to rot and/or discoloration. This discoloration is typically caused by a fungus or fungi or fungi/bacterial infestation and/or UV damage from natural sunlight and is aggravated by damage caused by seasonal and daily temperature changes. If the fungus or fungi does not infest the substrate, it may, at the least, cause discoloration. Contributing factors to exterior wood discoloration include:
(1) fungal infestation of porous surface and sub-surface structures,
(2) potential fungal/bacterial digestive damage on the wood itself,
(3) UV damage to the wooden surface which, with rain, may wash away surface layers of wood, thus, exposing undamaged wood to UV damage and renewing fungal nutrients and favorable conditions for fungal infestation.
In the specific case of wood, wood is comprised of three primary ‘building block’ materials, i.e., lignin, cellulose and hemi-cellulose. Research results from the USDA FP Div. Report that the lignin and related phenolic resin components of wood are most susceptible to UV damage due to these chromophores absorbance of ultraviolet (UV) light. Lignin acts as the primary binder that maintains the structural integrity of wood. UV damage of lignin causes discoloration and the eventual erosion of wood cells and fiber thereof. Polyphenolic compounds cause the lignin matrix to “break-down” and be removed by the leaching action of water.
USDA investigation has, also, revealed that solvents and especially water components used in wood sealers, preservatives and stains cause specific structures in wood that control water transport in living wood i.e. trees, to inhibit the penetration of such products into the wood. These structures, have a specific and specialized function to effectively act as ‘valves’ that open and close to control the flow of sap and water from the roots to the leaves. These ‘valves’ have been shown by the USDA to still be responsive to water and solvents well after the harvesting and processing of the tree. The continued activity of these liquid-transport, controlling structures contributes to the dynamic nature of wood in direct response to ambient temperature and humidity levels.
The present invention, as is described herein, provides an improved penetrating sealer and coating system for exterior porous structures and, in particular, exterior wooden structures by capitalizing on the transport structure of the sealer to enable deeper penetration and, therefore, deeper protection to the material especially when the sealer is coupled with specific adjuvants.
SUMMARY OF THE INVENTION
The present composition comprises a substantially 100% solids or solvent- and water-free composition which may be applied by spraying, dipping, pressure treatment, brushing or rolling and comprises:
(a) a polymerizable compound which is a mixture of acrylates, the acrylate mixture comprising at least a first and a second acrylate, the first acrylate having a lower molecular weight than the second acrylate; and
(b) a mixture or blend of organic photoinitiators which initiates the polymerization reaction upon exposure of the composition to ultraviolet light;
The composition hereof may further include:
(c) a filler material for controlling the penetration of the composition into the substrate;
(d) non-polymerizable, organic or inorganic, function specific additive(s) such as fungicide(s), scent oils, insect repellent(s), insecticide(s), animal repellent(s);
(e) ultraviolet light absorber(s) or stabilizer(s); and
(f) pigment(s).
Given the near total absence of water and solvents in the composition of the present invention, it is able to permeate through wood without triggering liquid transport controlling or impeding structures. Thus, the composition of the present invention provides deeper penetration and correspondingly deeper protection especially when function specific adjuvants, i.e. fungicide and insect repellents, which are able to penetrate wood deeper than compositions containing solvents and/or water are incorporated herewith.
The present coating composition is particularly useful in treating wooden decks, residential and commercial wooden siding, windows, doors, trim, fences, roofing and the like. However, the present coating is also useful for application to other porous construction materials, such as, concrete/asphalt, brick and stone such as limestone and sandstone as well as masonry surfaces. Further, the present composition may be pigmented or non-pigmented, sun-cured, and may, also, define a basis for improved low UV level curable, film-forming, paints, coatings and sealers.
For a more complete understanding of the present invention, reference is made to the following detailed description and accompanying illustrative examples.
DESCRIPTION OF THE PREFERRED EMBODIMENT
As noted above, the present composition provides a substantially 100% solids or solvent- and water-free, composition which may be applied by spraying, brushing, rolling, or the like, and comprises:
(a) a polymerizable compound which is a mixture of acrylates, the acrylate mixture comprising at least a first and a second acrylate, the second acrylate having a lower mean molecular weight than the first acrylate; and
(b) a mixture or blend of organic photoinitiators which initiates the polymerization reaction upon exposure of the composition to ultraviolet light.
The composition hereof may further include:
(c) a filler material for controlling the penetration of the composition into the substrate;
(d) a non-polymerizable, organic or inorganic, function specific additive(s) such as fungicide(s), scent oils, insect repellent(s), animal repellent(s);
(e) ultraviolet light absorber(s) or stabilizer(s); and
(f) pigment(s).
Other typical coating additives, such as flow, wetting and dispersing agents, defoamer, plasticizers, sanding agents, stabilizers, non-reactive diluents, reinforcement fibers and the like, as well as mixtures thereof may be incorporated inot the present formulation.
With more particularity, the present composition comprises from about 60.0% to about 99.999% by weight, based on the tota
Nutter Nathan M.
Weintraub, Esq. Arnold S.
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