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| It is a primary object of the present invention to provide a lens support free of the ... |
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| Cascaded, dual cell transflective liquid crystal display |
| OF THE PREFERRED EMBODIMENTS FIG. 1 shows two cascaded liquid crystal cells 10 and 11 separated by ... |
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| Backhoe attachment |
| What is claimed is: 1. An earth moving attachment and connection to an earth moving implement ... |
|
| Lamp-adjusting mechanism, particularly for photographic enlarging apparatus |
| I claim: 1. An adjustable light source for a photograhic projector apparatus having a condenser ... |
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| Scannable light emitting diode array and method |
| While the following preferred embodiment of the invention is disclosed with particular reference ... |
|
| Slit lamp microscope |
| According to the present invention, the above and other objects can be accomplished by a slit lamp ... |
|
| Electronic device for detecting the energized state of a liquid crystal display cell |
| An object of the present invention is to provide an electronic device for use, for example, in a ... |
|
| Illumination apparatus |
| It is accordingly a primary object of the present invention to provide an illumination apparatus ... |
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| Illuminating optical system |
| It is an object of the present invention to provide an illuminating optical system which enables a ... |
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Materials for optical use
| Details |
Inventors: Sudo, Ryoichi; Kobata, Makoto; Miwa, Hiroaki; Tajima, Tetsuo;
Assignee: Hitachi, Ltd. (Tokyo, JP)
Primary Examiner: Schofer; Joseph L.
Assistant Examiner: Walker; Alex H.
Attorney, Agent or Firm: Fay, Sharpe, Beall, Fagan, Minnich & McKee
A polymer excellent in transparency, mechanical properties, moisture resistance suitable for optical use is obtained by copolymerizing a (meth)acrylate compound (I) and a (meth)acrylate compound (II). ##STR1## |
|
DETAILED DESCRIPTION What is claimed is: 1.
A material for optical use obtained by subjecting to radical copolymerization 90 to 20% by weight of a (meth)acrylate compound represented by the following formula (I) and 10 to 80% by weight of a (meth)acrylate compound represented by the following formula (II): ##STR27## wherein n is 1 to 6; R.
sub.
1 is --H or --CH.
sub.
3 ; R.
sub.
2 is ##STR28## in which R.
sub.
5 is --H, an alkyl group having 1 to 5 carbon atoms or ##STR29## R.
sub.
3 is a hydrocarbon group having 6 to 16 carbon atoms; and R.
sub.
4 is a hydrogen group having 2 to 300 carbon atoms.
2.
A material according to claim 1, wherein said material is used as a substrate of an optical disc.
3.
A material for optical use having a heat distortion temperature of greater than 100.
degree.
C.
, an impact strength of greater than 30 cm, water absorption of less than 1.
2%, retardation of less than 10 nm and excellent workability, said material having been prepared by subjecting to radical copolymerization 90 to 20% by weight of a (meth)acrylate compound represetned by the following Formula (I) and 10 to 80% by weight of a (meth)acrylate compound represented by the following Formula (II): ##STR30## wherein n is 1 to 6; R.
sub.
1 is --H or --CH.
sub.
3 ; R.
sub.
2 is ##STR31## in which R.
sub.
5 is --H, and alkyl group having 1 to 5 carbon atoms or ##STR32## R.
sub.
3 is a hydrocarbon group having 6 to 16 carbon atoms; and R.
sub.
4 is a hdyrocarbon group having 2 to 300 carbon atoms.
4.
A material for optical use having a heat distortion temperature of greater than 100.
degree.
C.
, an impact strength of greater than 30 cm, water absorption of less than 1.
2% and retardation of less than 10nm in addition to excellent workability, said material having been prepared by subjecting to radical copolymerization 90 to 20% by weight of a (meth)acrylate compound represented by the following Formula (I) and 10 to 80% by weight of a (meth)acrylate compound represented by the following Formula (II): ##STR33## wherein n is 2 to 6; R
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