 Plastic molding of articles including a hologram or other microstructure |
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| Pre-imaged high resolution hot stamp transfer foil, article and method |
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| Holographic document and method for forming |
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| Tamper evident and counterfeit resisting informational article and associated method |
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| Embossed-in-register manufacturing process |
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| Method for generating a hologram on a disc surface |
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| Adhesive coated thin film label |
| The present invention provides a thin film label having a thickness in the range of 0.1 mil to 1.0 ... |
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| System and apparatus for the recording and projection of images in substantially 3-dimensional format |
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| Display device for both hardcopy and digital images |
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| Method for effecting illumination of an arbitrary aperture |
| OF THE INVENTION The method of the invention in its first aspect is preferably realized by way of ... |
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Microstructure-bearing articles of high refractive index
| Details |
Inventors: Ja Chisholm, Bret; Coyle, Dennis Joseph; Resue, James Alan;
Assignee: General Electric Company (Niskayuna, NY)
Primary Examiner: Berman; Susan
Assistant Examiner:
Attorney, Agent or Firm: Caruso; Andrew J., Patnode; Patrick K.
Blends of oligomeric urethane multi(meth)acrylate; optionally at least one other monomer selected from the group consisting of acrylic monomers, styrenic monomers and ethylenically unsaturated nitrogen heterocycles, preferably a polyol multi(meth)acrylate; and nanoparticles of an ethylenically unsaturated, preferably (meth)acrylic-functionalized, titanium or zirconium compound can be cured by ultraviolet radiation in contact with a photoinitiator to produce optical resinous articles having high refractive indices, haze ratings of at most 5% and other properties which may be tailored according to the desired use. |
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DETAILED DESCRIPTION ; PREFERRED EMBODIMENTS The optical resinous articles of the present invention are characterized by a surface with replicated microstructure comprising a plurality of utilitarian discontinuities, such as projections and depressions, which surface may be readily released from a mold after radiation curing without loss of the detail of the mold and with retention of the replication of such detail under a wide variety of conditions during use.
The articles have a wide variety of desired properties, such as toughness, flexibility, optical clarity and homogeneity, and resistance to common solvents.
The microstructures of such articles have high thermal dimensional stability, resistance to abrasion and impact, and integrity even when the articles are bent to an angle as great as 180.
degree.
.
The term "microstructure" is used herein as defined and explained in U.
S.
Pat.
No.
4,576,850, the disclosure of which is incorporated by reference herein.
Thus, it means the configuration of a surface which depicts or characterizes the predetermined desired utilitarian purpose or function of the article having the microstructure.
Discontinuities such as projections and indentations in the surface of said article will deviate in profile from the average center line drawn through the microstructure such that the sum of the areas embraced by the surface profile above the center line is equal to the sum of the areas below the line, said line being essentially parallel to the nominal surface (bearing the microstructure) of the article.
The heights of said deviations will typically be about .
+-.
0.
005 to .
+-.
750 microns, as measured by an optical or electron microscope, through a representative characteristic length of the surface, e.
g.
, 1-30 cm.
Said average center line can be piano, concave, convex, aspheric or combinations thereof.
Articles where said deviations are of low order, e.
g.
, from .
+-.
0.
005 to .
+-.
0.
1 or, preferably, to .
+-.
0.
05 microns, and said deviations are of infrequent or minimal occurrence, i
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Optical Systems 
