Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2001-08-02
2003-02-25
Seidleck, James J. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S089000, C525S148000, C523S221000, C430S120400, C430S108100
Reexamination Certificate
active
06525136
ABSTRACT:
Copending Application U.S. Ser. No. 09/864,386, filed May 24, 2001. entitled “Photochromic Gyricon Display,” with the named inventors Daniel A. Foucher, Raj D. Patel, Naveen Chopra, Peter M. Kazmaier, Erwin Buncel, and James Wojtyk, the disclosure of which is totally incorporated herein by reference, discloses a display comprising an arrangement of a plurality of optically anisotropic rotatable elements, each of said rotatable elements having a surface in contact with an enabling fluid, said rotatable elements being electrically dipolar in the presence of the enabling fluid and thus being subject to rotation upon application of an electric field, said rotatable elements being free to rotate in place but not free to translate substantially so as to disrupt the arrangement of rotatable elements, wherein a first portion of said surface contains a mixture of a chelating agent and a spiropyran material of the formula
wherein n is an integer representing the number of repeat —CH
2
— units and R is —H or —CH═CH
2
, and wherein a second portion of said surface contains substantially no spiropyran.
Copending Application U.S. Ser. No. 09/864,902, filed May 24, 2001, entitled “Photochromic Electrophoretic Ink Display,” with the named inventors Daniel A. Foucher, Raj D. Patel, Naveen Chopra, Peter M. Kazmaier, Erwin Buncel, and James Wojtyk, the disclosure of which is totally incorporated herein by reference, discloses an electrophoretic ink comprising a suspending fluid and, suspended in the suspending fluid, a plurality of particles comprising a mixture of a chelating agent and a spiropyran material of the formula
wherein n is an integer representing the number of repeat —CH
2
— units and R is —H or —CH═CH
2
, said particles being free to migrate within said suspending fluid under the influence of an electric field.
Copending Application U.S. Ser. No. 09/864,475, filed May 24, 2001, entitled “Marking Particles,” with the named inventors Daniel A. Foucher, Raj D. Patel, Naveen Chopra, Peter M. Kazmaier, Erwin Buncel, and James Wojtyk, the disclosure of which is totally incorporated herein by reference, discloses marking particles comprising a first polymer, a second polymer, a chelating agent, and a spiropyran material of the formula
wherein n is an integer representing the number of repeat —CH
2
— units and R is —H or —CH═CH
2
. The marking particles comprise a core containing the first polymer in which is dispersed the chelating agent and the spiropyran and encapsulated within a shell of the second polymer formulated by an interfacial polymerization.
Copending Application U.S. Ser. No. 09/864,535, filed May 24, 2001, entitled “Marking Particles,” with the named inventors Daniel A. Foucher, Raj D. Patel, Naveen Chopra, and Peter M. Kazmaier, the disclosure of which is totally incorporated herein by reference, discloses marking particles comprising a resin, a chelating agent, and a spiropyran material which is of the formula
The marking particles are prepared by an emulsion aggregation process.
BACKGROUND OF THE INVENTION
The present invention is directed to processes for the preparation of photochromic high density storage media and imaging processes therewith. More specifically, the present invention is directed to compositions and processes for the preparation of optically addressable, high density, three-dimensional photochromic storage media for use in, for example, digital recording media and processes. One embodiment of the present invention is directed to a matrix composition which: comprises (a) a discrete phase comprising an ordered array of core particles containing a first resin, and (b) an annealed continuous phase comprising a second resin, wherein at least one of the first resin and the second resin contains a chelating agent and a spiropyran compound of the formula
wherein n is an integer representing the number of repeat —CH
2
— units and R is —H or —CH═CH
2
, wherein if the spiropyran compound is irradiated then the optical properties of the resin containing the spiropyran compound change. Another embodiment of the present invention is directed to a composition comprising a matrix which comprises particles comprising a core resin and a shell resin thereover, wherein at least one of the core resin and the shell resin contains a chelating agent and a spiropyran compound of the formula
wherein n is an integer representing the number of repeat —CH
2
— units and R is —H or —CH═CH
2
, wherein the shell resin is the continuous phase of the matrix, wherein the spiropyran compound can produce changes in the optical and photoactive properties of the resin containing the spiropyran when irradiated. Yet another embodiment of the present invention is directed to a process which comprises (a) organizing into an array particles comprising a core resin and a shell resin, wherein at least one of the core resin and the shell resin contains a chelating agent and a spiropyran compound of the formula
wherein n is an integer representing the number of repeat —CH
2
— units and R is —H or —CH═CH
2
; and (b) heating the array to cause the shell resin to melt, partially flow, then harden on cooling, to fix the particles into a storage medium comprising the particles as a discrete phase and the shell resin as a continuous phase. Still another embodiment of the present invention is directed to a process which comprises fusing an array of particles comprising a core resin with a shell resin thereover to fix the particles into a matrix, wherein at least one of the core resin and the shell resin contains a chelating agent and a spiropyran compound of the formula
wherein n is an integer representing the number of repeat —CH
2
— units and R is —H or —CH═CH
2
, and wherein the core resin comprises a discrete phase and the shell resin comprises a continuous phase of the matrix.
Photochromism in general is a reversible change of a single chemical species between two states having distinguishably different absorption spectra, wherein the change is induced in at least one direction by the action of electromagnetic radiation. The inducing radiation, as well as the changes in the absorption spectra, are usually in the ultraviolet, visible, or infrared regions. In some instances, the change in one direction is thermally induced. The single chemical species can be a molecule or an ion, and the reversible change in states may be a conversion between two molecules or ions, or the dissociation of a single molecule or ion into two or more species, with the reverse change being a recombination of the two or more species thus formed into the original molecule or ion. Photochromic phenomena are observed in both organic compounds, such as anils, disulfoxides, hydrazones, oxazones, semicarbazones, stilbene derivatives, o-nitrobenzyl derivatives, spiro compounds, and the like, and in inorganic compounds, such as metal oxides, alkaline earth metal sulfides, titanates, mercury compounds, copper compounds, minerals, transition metal compounds such as carbonyls, and the like. Photochromic materials are known in applications such as photochromic glasses, which are useful as, for example, ophthalmic lenses.
U.S. Pat. No. 5,952,131 (Kumacheva et al.) and U.S. Pat. No. 6,214,500 (Kumacheva et al.), the disclosures of each of which are totally incorporated herein by reference, disclose a composition including a matrix which comprises particles comprising a core resin and a shell resin thereover, wherein the core resin contains a covalently bonded photosensitive compound, and wherein the shell resin is the continuous phase of the matrix.
U.S. Pat. No. 5,633,109 (Jennings et al.), the disclosure of which is totally incorporated herein by reference, discloses an ink composition which comprises an aqueous liquid vehicle, a photochromic material, and a vesicle-forming lipid, wherein vesicles of the lipid are present in the ink.
U.S. Pat. No. 5,551,973 (Oliver et al.), the disclosure of which is totally incorporated herein by reference, discloses an ink composition which comprises an aqueous
Foucher Daniel A.
Noolandi Jaan
Sharp James H.
Asinovsky Olga
Byorick Judith L.
Seidleck James J.
Xerox Corporation
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