The present invention relates to novel compounds, particularly to compounds comprising a photoactive unit, said novel compounds being particularly suitable for compositions and ophthalmic devices as well as to compositions and ophthalmic devices comprising such compounds.

The present invention relates to novel compounds, particularly to compounds comprising a photoactive unit, said novel compounds being particularly suitable for compositions and ophthalmic devices as well as to compositions and ophthalmic devices comprising such compounds.

An active energy ray curable composition including a polymerization initiator and a polymerizable compound is provided. When the active energy ray curable composition is formed into a cured film on a substrate under the specific condition, the cured film satisfies the following conditions (1) and (2): (1) when the substrate is a polyethylene terephthalate substrate, the cured film on the substrate has a transmission density of from 1.5 to 3.0 that is measured with a transmission densitometer, and (2) when the substrate is a polycarbonate substrate, the cured film on the substrate has a first length (L1) and a second length (L2) before and after a specific tensile test, respectively, and a ratio of L2/L1 ranges from 1.5 to 4.0.

An active energy ray curable composition including a polymerization initiator and a polymerizable compound is provided. When the active energy ray curable composition is formed into a cured film on a substrate under the specific condition, the cured film satisfies the following conditions (1) and (2): (1) when the substrate is a polyethylene terephthalate substrate, the cured film on the substrate has a transmission density of from 1.5 to 3.0 that is measured with a transmission densitometer, and (2) when the substrate is a polycarbonate substrate, the cured film on the substrate has a first length (L1) and a second length (L2) before and after a specific tensile test, respectively, and a ratio of L2/L1 ranges from 1.5 to 4.0.

The present invention relates to novel compounds, particularly to compounds comprising a photoactive unit, said novel compounds being particularly suitable for compositions and ophthalmic devices as well as to compositions and ophthalmic devices comprising such compounds.

The present invention relates to novel compounds, particularly to compounds comprising a photoactive unit, said novel compounds being particularly suitable for compositions and ophthalmic devices as well as to compositions and ophthalmic devices comprising such compounds.

The present invention relates to novel compounds, particularly to compounds comprising a photoactive unit, said novel compounds being particularly suitable for compositions and ophthalmic devices as well as to compositions and ophthalmic devices comprising such compounds.

The present invention relates to resin particles including a residue unit represented by the following general formula (1) and having a volume average particle diameter equal to or more than 5 m and equal to or less than 2000 m, and a method for producing thereof. Furthermore the present invention relates to a fluororesin comprising a residue unit represented by a general formula (1) and having a weight average molecular weight Mw in a range of 510.sup.4 to 310.sup.5, and a yellow index of a heat-melted molded product (thickness 3 mm) after 24 h at 280 C. of equal to or less than 6, and a method for producing thereof.

##STR00001##

In the formula (1), Rf.sub.1, Rf.sub.2, Rf.sub.3, and Rf.sub.4 are each independently one of the groups consisting of a fluorine atom, a linear perfluoroalkyl group having 1 to 7 carbon atoms, a branched perfluoroalkyl group having 3 to 7 carbon atoms, or a cyclic perfluoroalkyl group having 3 to 7 carbon atoms. The perfluoroalkyl group may have an ethereal oxygen atom. Further, Rf.sub.1, Rf.sub.2, Rf.sub.3, and Rf.sub.4 may be linked to one another to form a ring having 4 or more and 8 or less carbon atoms, and the ring may include an ethereal oxygen atom.

A fluororesin including a residue unit of formula (1) and having a haze value equal to 2% or less of a heat-press molded product (thickness 1 mm) with a small haze value of a melt-molded product and a method for producing the same,

##STR00001##

Rf.sub.1, Rf.sub.2, Rf.sub.3 and Rf.sub.4 each independently represent one of the groups consisting of a fluorine atom, a linear perfluoroalkyl group having 1 to 7 carbon atoms, a branched perfluoroalkyl group having 3 to 7 carbon atoms, and a cyclic perfluoroalkyl group having 3 to 7 carbon atoms, the perfluoroalkyl group may have an ethereal oxygen atom, Rf.sub.1, Rf.sub.2, Rf.sub.3 and Rf.sub.4 may be linked to each other to form a ring having 4 or more and 8 or less carbon atoms, and the ring may include an ethereal oxygen atom.

A fluororesin including a residue unit of formula (1) and having a haze value equal to 2% or less of a heat-press molded product (thickness 1 mm) with a small haze value of a melt-molded product and a method for producing the same,

##STR00001##

Rf.sub.1, Rf.sub.2, Rf.sub.3 and Rf.sub.4 each independently represent one of the groups consisting of a fluorine atom, a linear perfluoroalkyl group having 1 to 7 carbon atoms, a branched perfluoroalkyl group having 3 to 7 carbon atoms, and a cyclic perfluoroalkyl group having 3 to 7 carbon atoms, the perfluoroalkyl group may have an ethereal oxygen atom, Rf.sub.1, Rf.sub.2, Rf.sub.3 and Rf.sub.4 may be linked to each other to form a ring having 4 or more and 8 or less carbon atoms, and the ring may include an ethereal oxygen atom.