An article includes a polymer. The polymer includes a product of a crosslinking reaction including at least one cross-linker selected from the group consisting of: a) di-acrylates, tri-acrylates, and tetra-acrylates; b) modified tri-acrylates and tetra-acrylates; c) silanes and siloxanes; and d) triazinane-triones.

A compound having a group represented by formula (Ia): ##STR00001##
wherein R.sup.1 and R.sup.2 each independently represent a C.sub.1 to C.sub.8 fluorinated alkyl group, ring W represents a C.sub.5 to C.sub.18 alicyclic hydrocarbon group that may have a substituent, and * represents a binding site.

A compound having a group represented by formula (Ia): ##STR00001##
wherein R.sup.1 and R.sup.2 each independently represent a C.sub.1 to C.sub.8 fluorinated alkyl group, ring W represents a C.sub.5 to C.sub.18 alicyclic hydrocarbon group that may have a substituent, and * represents a binding site.

A polymerizable compound having absorption in the long UV wavelength range, a liquid-crystal (LC) medium comprising the polymerizable compound, and the use of the compound or LC medium for optical, electro-optical and electronic purposes, in particular in LC displays, especially in LC displays of the PSA (polymer sustained alignment) or SA (self-aligning) mode, an LC display of the PSA or SA mode comprising the compound or LC medium, and a process of manufacturing the LC display.

A polymerizable compound having absorption in the long UV wavelength range, a liquid-crystal (LC) medium comprising the polymerizable compound, and the use of the compound or LC medium for optical, electro-optical and electronic purposes, in particular in LC displays, especially in LC displays of the PSA (polymer sustained alignment) or SA (self-aligning) mode, an LC display of the PSA or SA mode comprising the compound or LC medium, and a process of manufacturing the LC display.

Low refractive index and high dispersion material which can produce a bonded-multilayer DOE having an excellent optical performance is obtained, and the optical member using this is obtained. The resin precursor for optical materials obtained through the addition reaction of the composite containing a di (meth) acrylate shown in the following Chemical Expression 1. ##STR00001## where, RH or CH.sub.3, and m+n=1 to 10.

Low refractive index and high dispersion material which can produce a bonded-multilayer DOE having an excellent optical performance is obtained, and the optical member using this is obtained. The resin precursor for optical materials obtained through the addition reaction of the composite containing a di (meth) acrylate shown in the following Chemical Expression 1.

##STR00001## where, RH or CH.sub.3, and m+n=1 to 10.

A compound represented by the formula (I).

##STR00001##

wherein R.sup.1 represents a hydrogen atom, a halogen atom or a C.sub.1 to C.sub.6 alkyl group that may have a halogen atom; R.sup.2 represents a C.sub.1 to C.sub.12 fluorinated saturated hydrocarbon group; W.sup.1 represents a C.sub.5 to C.sub.18 divalent alicyclic hydrocarbon group; A.sup.1 and A.sup.2 independently represents a single bond or *-A.sup.3-X.sup.1-(A.sup.4-X.sup.2).sub.a-; A.sup.3 and A.sup.4 independently represents a C.sub.1 to C.sub.6 alkanediyl group; X.sup.1 and X.sup.2 independently represents O, COO or OCO; a represents 0 or 1; and * represents a bond to an oxygen atom.

A compound represented by the formula (I).

##STR00001##

wherein R.sup.1 represents a hydrogen atom, a halogen atom or a C.sub.1 to C.sub.6 alkyl group that may have a halogen atom; R.sup.2 represents a C.sub.1 to C.sub.12 fluorinated saturated hydrocarbon group; W.sup.1 represents a C.sub.5 to C.sub.18 divalent alicyclic hydrocarbon group; A.sup.1 and A.sup.2 independently represents a single bond or *-A.sup.3-X.sup.1-(A.sup.4-X.sup.2).sub.a-; A.sup.3 and A.sup.4 independently represents a C.sub.1 to C.sub.6 alkanediyl group; X.sup.1 and X.sup.2 independently represents O, COO or OCO; a represents 0 or 1; and * represents a bond to an oxygen atom.

Low refractive index and high dispersion material which can produce a bonded-multilayer DOE having an excellent optical performance is obtained, and the optical member using this is obtained. The resin precursor for optical materials obtained through the addition reaction of the composite containing a di (meth) acrylate shown in the following Chemical Expression 1.

##STR00001##

where, RH or CH.sub.3, and m+n=1 to 10.