Stock material or miscellaneous articles – Circular sheet or circular blank
Reexamination Certificate
2000-12-28
2002-08-27
Mulvaney, Elizabeth Evans (Department: 1774)
Stock material or miscellaneous articles
Circular sheet or circular blank
C428S064700, C430S270120
Reexamination Certificate
active
06440518
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a liquid composition which forms a transparent coating on the optical surface of an optical information disk in order to protect the optical surface of the optical information disk from being scratched.
In their article, entitled “Scratch-resistant single-layer antireflective coating by a low-temperature sol-gel route,” published in the Proceedings of
SPIE
, Volume 1758, pages 135-149, Sol-Gel Optics II, edited by John D. Mackenzie in December 1992, Herve G. Floch and Phillippe F. Belleville stated that a quarter-wave-thick narrow-bandwidth antireflective coating has been developed for use on plastic substrates by a sol-gel route. This coating has revealed pronounced scratch-resistance and climatic-resistance under adverse conditions. The single-layer coating consists basically of a composite material made of silica as the discontinuous phase and of a polytetrafluoro-ethylene-derived (TeflonTM) organic polymer as the continuous phase. This leads to a fluorine-containing silica-based product so-called Fluosil-coating. The coating is applied by spin or dip from specific solutions at room temperature followed by a mild and short heat treatment. In addition to remarkable abrasion and environmental resistance properties, such coatings have displayed excellent laser-induced damage threshold levels surpassing uncoated substrates. Such a product has opened new perspectives concerning architectural optical thin-films and ophthalmic lenses.
It is known that the surfaces of solid substrates that have been subjected to treatments or machining to provide a polish, gloss, or another surface aspect, as required by technical or decorative requirements, must be protected by suitable coatings to prevent any alteration of the surface condition. Such protection is more necessary when the surface is more fragile or subject to the risks of alteration or degradation as in the case of, for example, glass, ceramics, and organic polymeric materials which may be scratched or opacified from the effects of friction, abrasion, or even shock.
U.S. Pat. No. 6,077,583 teaches a transparent protective cover for the play-side of an optical disk which is made of polycarbon film. The protective cover is annular in shape and is appropriately sized to fit the various disc formats. There is provided an inner crevice or groove that fits the inner molding of a disc allowing for greater structural integrity and which assists in the placement of the protector on the disc. The device is attached to the disc using several clips that are located around the perimeter.
U.S. Pat. No. 4,983,437 teaches a thin, flat, polymer, scratch resistant, user applied disc protector with self-adhesive backing which affixes to the top of an optical information disc to help eliminate possible damage from impact which would render the disc in a semi-unplayable or unplayable condition. This extra layer of user applied protection is prefabricated to proper size to adhesively secure to various optical mediums with a self-adhesive layer by an application method of installation on the top, protective side of the disc. Adhesive allows for permanent placement on the disc for convenience without hindering operation of the disc and without hindering readability of the context of the information lettering. This disc protector can include a removable peel-away backing.
U.S. Pat. No. 5,757,765 teaches a protection structure which is adapted for protecting a disc includes a film mounted on an underside of the disc for covering a data reading region of the disc. The film includes an inner rim portion abutting on an inner annular portion of the disc, and an outer rim portion abutting on an outer annular portion of the disc. A plurality of ribs each a extend radially and inwardly from the inner rim portion of the film and each abut on the inner annular portion of the disc, and a plurality of recesses are each defined between adjacent two of the ribs. An annular adhesive sheet forms an adhesive surface which can be adhered on each of the ribs and can be adhered on the inner annular portion of the disc via each of the recesses, thereby securing each of the ribs on the inner annular portion of the disc.
U.S. Pat. No. 5,743,965 teaches a disk coating system for forming a coating on a disk such as an optical information disk which transfers disks to and from a pair of spinners with first and second disk transfer mechanisms. The coating system further has an intermittently rotating turntable, an apparatus for supplying a coating material to each disk on the turntable at a predetermined position, and a system for curing a coating layer on each disk. The spinners for removing an excess amount of the coating material are placed between the turntable and the curing system. The first transfer mechanism is for transferring disks from the turntable to the spinners, and the second transfer mechanism is for transferring disks from the spinners to the curing system. The two spinners are substantially equidistant from a predetermined disk position on the turntable. The first transfer mechanism has two arms extending in two directions diverging from a pivot at a predetermined angle. With both arms, this transfer mechanism can transfer disks from the predetermined disk position on the turntable alternately to the first and second spinners at a high speed.
U.S. Pat. No. 4,736,966 teaches an optical data storage medium, such as a data card with a strip of optical data storage material, which has peelable transparent protective layers adhered above the storage material. When a protective layer becomes too scratched to read or write through, it may be removed by peeling. More than one layer may be adhered successively above one another, and removed one by one as they become scratched. The peelable protective layers are preferably adhesive tapes made of Aclar, Mylar, polyester, or other hard-to-tear polymers with pressure sensitive adhesive. One or more of the layers, and an underlayer between substrate or card base and the storage material may be a water barrier material such as a polytrichlorofluoroethylene.
U.S. Pat. No. 5,518,788 teaches an optical recording disk which has an anti-static hard coat layer provided on at least one surface of the disk. The hard coat layer includes a fluorinated ionic salt. A polymer includes a plurality of pendant fluorinated groups and optionally a nonionic fluorinated surfactant. The polymer comprising a plurality of pendant fluorinated groups is preferably a copolymer derived from monomers comprising a nonfluorinated vinyl monomer; and a vinyl monomer comprising a fluorinated group.
U.S. Pat. No. 5,935,673 teaches an optical disk which has a surface which is coated with a removable layer of a material that does not significantly alter the optical properties of the disc in order to protect the optical surface of optical information disk such as an optical information disk or a digital versatile disk. Whenever the coating layer may have become damaged, it is removed and replaced with a new layer.
U.S. Pat. No. 5,744,243 teaches a composition which produces durable coatings and a process for preparing a single-layer broad band antireflective coating on solid substrates, such as glass, ceramics, metals, and organic polymeric materials. The coating composition consists, in combination, acid catalyzed hydrolysis and condensation products of water-silane monomer mixture and a film forming amount of a polymer having functional groups selected from amino, hydroxy and carboxy, hydroxy and amino, amino and carboxy, and amino, hydroxy and carboxy. The process includes the steps of applying the aforesaid coating composition (or an acid catalyzed sol-gel coating composition) substantially free of preformed oxide sol and water soluble metal salt to the surface of a solid substrate, curing the applied coating, and treating the cured coating with an aqueous electrolyte solution for a time sufficient to produce a coating having graded porosity which is antireflective over a broad band of the visible spectrum
Johansen W. Edward
Mulvaney Elizabeth Evans
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