Core and shell matrix compositions and processes

Details Core and shell matrix compositions and processes Core and shell matrix compositions and processes

1999-07-22

2001-04-10

McPherson, John A. (Department: 1756)

Radiation imagery chemistry: process, composition, or product th

Retrieving image made using radiation imagery

C430S138000, C430S139000, C430S270140, C430S321000, C430S962000

Reexamination Certificate

active

06214500

ABSTRACT:

REFERENCE TO COPENDING AND ISSUED PATENTS
Attention is directed to commonly owned and assigned U.S. Pat. No. 5,633,109, entitled “Ink Compositions With Liposomes Containing Photochromic Compounds,” and which application discloses an ink composition comprised of 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, entitled “Photochromic Microemulsion Ink Compositions,” discloses an ink composition which comprises an aqueous phase, an oil phase, a photochromic material, and a surfactant, the ink exhibiting a liquid crystalline gel phase at a first temperature and a liquid microemulsion phase at a second temperature higher than the first temperature; and U.S. Pat. No. 5,593,486, entitled “Photochromic Hot Melt Ink Compositions,” discloses a hot melt ink composition comprising (a) an ink vehicle, the ink vehicle being a solid at about 25° C. and having a viscosity of from about 1 to about 20 centipoise at a temperature suitable for hot melt ink jet printing, the temperature being greater than about 45° C., (b) a photochromic material, and (c) an optional propellant.
Attention is directed to commonly owned and assigned U.S. Pat. No. 5,710,420, entitled “Method for Embedding and Recovering Machine-Readable Information,” and which application discloses a method of embedding and recovering machine readable information on a substrate which comprises (a) writing data in a predetermined machine readable code format on the substrate with a photochromic marking material having a first state corresponding to a first absorption spectrum and a second state corresponding to a second absorption spectrum; and (b) thereafter effecting a photochromic change in the photochromic marking material from the first state to the second state; U.S. Pat. No. 5,759,729 which discloses a toner composition for the development of electrostatic latent images which toner comprises particles of a mixture of a resin and a photochromic material.
The disclosures of each the above mentioned patents and copending applications are incorporated herein by reference in their entirety. The appropriate components and processes of these patents may be selected for core and shell resins and particle formation for use in processes of the present invention in embodiments thereof.
BACKGROUND OF THE INVENTION
The present invention is generally directed to processes for the preparation of high density storage media and imaging processes thereof. More specifically, the present invention relates to compositions and processes for the preparation of optically addressable, high density, three dimensional storage media, for example, for use in digital recording media and processes.
It is highly desirable to have simple and reliable methods for preparing materials with structures comprised of nanoparticles, such as polymer encapsulated resin particles, that are ordered on a macroscopic scale, including thin film and two dimensional media, and especially three dimensional periodic arrays wherein the storage density is greatly enhanced.
PRIOR ART
A publication by Lepizzera et al., in
Macromolecules,
1997, 30, 7953, discloses a method for preparing and characterizing latex films. The films were obtained by 1) forming core resin particles by emulsion polymerization; 2) forming a shell resin thereover by a redox reaction; and 3) coating and coalesing the resulting core/shell particles to form films. The behavior of the core particles upon elongation and deformation was characterized using atomic force microscopy.
U.S. Pat. No. 4,803,688, to Lawandy, issued Feb. 7, 1989, discloses ordered colloidal suspension optical devices, for example, a number of ordered colloidal suspension Bragg reflection optical devices are disclosed each of which comprises a receiver for receiving incident electromagnetic radiation, a modulator, responsive to at least one characteristic of the received radiation, for modulating the received radiation and an emitter for emitting the modulated radiation. The receiver, modulator and the emitter comprise a crystalline colloidal suspension having a lattice structure comprised of a plurality of parallel planes of ordered, electrically charged spheres suspended in an optically active medium, adjacent ones of the planes having a substantially uniform spacing therebetween. The optically active medium comprises molecules selected to have a predetermined index of refraction, radiation absorption, radiation emission or a nonlinear optical response property at a wavelength substantially equal to twice the spacing between the planes. The medium may contain a dye solute, the particular dye being selected to have a radiation absorption and/or emission wavelength which is substantially equal to twice the spacing between the parallel planes.
U.S. Pat. No. 5,326,692, to Brinkley et al., issued Jul. 5, 1994, discloses fluorescent microparticles with controllable enhanced stokes shift, for example, microparticles incorporating a series of two or more fluorescent dyes having overlapping excitation and emission spectra allowing efficient energy transfer from the excitation wavelength of the first dye in the series, transfer through the dyes in the series and remitted as an optical signal at the emission wavelength of last dye in the series, resulting in a desired effective Stokes shift which is controlled through selection of appropriate dyes.
U.S. Pat. No. 5,573,909, to Singer et al., issued Nov. 12, 1996, discloses fluorescent labeling using microparticles with controllable stokes shift, for example, methods for labeling or detecting one or more target materials using surface coated fluorescent microparticles with unique characteristics. The unique microparticles used to practice the invention have at least two components: an external substance or coating that is selective for each target material and an internal mixture of multiple fluorescent dyes. The mixture of dyes is a series of two or more fluorescent dyes having overlapping excitation and emission spectra allowing efficient energy transfer from the excitation wavelength of the first dye in the series, transfer through the dyes in the series and re-emitted as an optical signal at the emission wavelength of last dye in the series, resulting in a desired effective Stokes shift for the microparticle that is controlled through selection of appropriate dyes. The unique microparticles are combined with a sample thought to contain the target material(s), so that the microparticles label the target materials. The sample is then optionally illuminated, resulting in fluorescence of the microparticles that is used to detect one or more target materials.
U.S. Pat. No. 5,592,461, to Tsujioka et al., issued Jan. 7, 1997, discloses methods of recording and reproducing information using an optical recording medium comprising a masking layer on a side of a recording layer for receiving a reproducing beam. The masking layer is prepared from that containing photochromic dye molecules having absorption at the wavelength of the reproducing beam and causing a photon mode reaction by absorbing the reproducing beam to be reduced in absorption.
U.S. Pat. No. 5,648,135, to Watanabe et al., issued Jul. 15, 1997, discloses information recording medium which has a recording layer which comprises a composition containing: I) at least one organic polymer selected from the group consisting of: (a) conjugated polymers whose conformations change by thermal energy, for example, polythiophene, and (b) polymers containing as a component a diene monomer and/or an aromatic-ring-containing vinyl monomer, for example, polystyrene; and II) a dye having light-absorbing ability, for example, naphthalocyanine. Despite the recording layer is of the organic type that features non-toxicity and low manufacturing cost as advantages, the recording layer makes it possible to produce a rewritable optical disc which can be recorded by a semiconductor laser (830,780 nm) employed widely.
U.S. Pat. No. 5,268,862, to Rentzepis, iss

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