Compositions: coating or plastic – Coating or plastic compositions – Carbohydrate or derivative containing
Patent
1994-06-10
1995-10-10
Brunsman, David
Compositions: coating or plastic
Coating or plastic compositions
Carbohydrate or derivative containing
106171, 106245, 106253, C09D10118
Patent
active
054567475
DESCRIPTION:
BRIEF SUMMARY
This is a 371 of PCT/AU 92/00663 filed 16 December 1992.
THIS INVENTION relates to a material for use in the reduction of glare and reflection from reflective surfaces such as television screens, visual display screens, digital read-out screens, depth sounding screens, dial faced glass, most reversed image screens, and windows.
Glare and reflection are particular problems with VDUs giving rise to headaches, eyestrain, irritated eyes, blurred vision and many other symptoms. A large number of attempts have been made to address these problems such as by carefully arranging the background lighting, positioning the VDU in the most appropriate viewing location and/or using micromesh filters or glass or plastics films. None of these has been entirely successful. Mesh filters are one of the solutions to the problems of screen reflection but they do have adverse effects and the majority are extremely expensive.
It is therefore an object of the present invention to provide an expedient, inexpensive product for reducing glare and reflection which obviates the problems of known solutions.
According to the present invention, there is provided a material for application to a reflective surface to reduce the glare and/or reflection therefrom, said material comprising a lacquer dissolved in a flatting base; wherein the lacquer comprises at least one C.sub.2 -C.sub.6 aliphatic ester, at least one C.sub.1 -C.sub.6 aliphatic alcohol, at least one C.sub.2 -C.sub.8 ketone, nitrocellulose, a plasticizer, and an aromatic solvent; and the flatting base comprises an aromatic solvent, a hydrocarbon solvent mixture, at least one C.sub.2 -C.sub.6 aliphatic ester, silica, wax, an alkyd resin and an anti-settling agent; and wherein said material forms a transparent solid layer upon application to a reflective surface.
The invention also extends to the novel lacquer and the flatting base per se.
The preferred C.sub.2 -C.sub.6 aliphatic ester is butyl acetate. The ester may be present in an amount of from 5-20% w/w in the lacquer and in an amount of up to 5% w/w in the flatting base.
The C.sub.1 -C.sub.6 aliphatic alcohol may be any of the common alcohols but preferably one which is not too volatile. N-butanol is preferred. The quantity of alcohol will generally be within the range of 1-5% w/w.
Preferably, two ketones are used, viz a low carbon ketone such as acetone and a higher carbon ketone such as methyl isobutylketone. These may be present in a total amount of 20-30% w/w, each.
An example of the nitrocellulose which may be used is that sold by I.C.I. (Australia) Pry Ltd under the product code AHX8/13. The nitrocellulose is preferably incorporated in an amount of from 10-20% w/w.
The plasticizer is generally a non-volatile organic liquid plasticizer, such as diisooctyl phthalate, and is incorporated in an amount ranging from 1 to 3% w/w.
Preferred aromatic solvents are those comprising low weight aromatics such as benzene and its substituted derivatives such as toluene, and mixtures thereof. These are generally present in an amount of 1-5% w/w.
The hydrocarbon solvent mixture present in the flatting base will be the material produced during petroleum distillation. A typical example is one containing about 50% w/w aromatics and it may be present in an amount of 15-25% w/w.
The silica acts as a filler and is preferably a synthetic silica such as DEGUSSA OK412. This may comprise 5-10% w/w of the composition.
Preferably the wax is a synthetic wax present in an amount of 1-5% w/w.
The alkyd resin is a thermosetting polymer preferably comprising 70% N.V.M/toluene. It is suitably present in an amount of from 20 to 30% w/w.
The final constituent, namely the anti-settling agent can be an oil, such as castor oil, in a range of 0.1 to 0.5% w/w.
Preferably, the relative proportion of lacquer to flatting base is within the range of 5:1 to 20:1 on a weight basis.
The ingredients recited above are preferred materials and it is additionally to be borne in mind that any one or more of the ingredients may be omitted or substituted by a material of equ
REFERENCES:
patent: 2604414 (1952-07-01), Pike
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