Abstract: A plastic lens material comprising at least one group having formula (1) as a terminal group and a group having formula (2) as a repeating unit wherein each R1 independently represents an allyl group or a methallyl group and each A1 is an independent organic residue and represents one or more organic residues derived from a divalent carboxylic acid or dicarboxylic anhydride having an alicyclic structure and/or an aromatic ring structure; wherein each A2 is an independent organic residue and represents one or more organic residues derived from a divalent carboxylic acid or dicarboxylic anhydride having an alicyclic structure and/or an aromatic ring structure, and each X is an independent organic residue and represents one or more organic residues derived from a polyhydric alcohol having an ether bond within the molecule, provided that X can further have a branched structure having a group of formula (1) as a terminal group and group of formula (2) as a repeating unit.

Abstract: A plastic lens composition having a low viscosity, a plastic lens by curing the composition, and a method for producing the plastic lens are disclosed. The plastic lens composition contains a bromine-containing (meth)allyl ester-based compound and exhibits low viscosity and the cured composition has a high refractive index of 1.58 or more and a low specific gravity of 1.40 or less.

Abstract: A plastic lens composition having a low viscosity and capable of yielding a cured material having a high refractive index and a small specific gravity, a plastic lens by curing the composition, and a method for producing the plastic lens. A plastic lens composition containing a bromine-containing (meth)allyl ester-based compound is low in viscosity as compared with conventional plastic lens compositions and a cured material of the composition has a high refractive index and a low specific gravity.

Abstract: A compound favored with low viscosity, capable of providing a cured product having high refractive index, and suitable for application to optical materials, including plastic lens material, radical polymerizable flame retardant and the like, as well as a process for producing the compound, a plastic lens composition using the compound, a plastic lens obtained by curing the composition and a process for producing the plastic lens. A novel aromatic ring-containing polyvalent (meth)allyl ester derived from a polyvalent carboxylic acid of trivalent or greater valent is employed.

Abstract: A material for plastic lenses, comprising at least one group represented by the following formula (1) as a terminal group and a group represented by the following formula (2) as a repeating unit.

Abstract: This invention is to provide a polymerizable composition having excellent curability and surface hardness, and a cured product thereof.

Abstract: Disclosed herein is a novel 1-alkenyl ether compound which can be cured by radical polymerization.

Abstract: A method for isomerizing a maleate, or a maleate containing a 2-propenyloxy group in the molecule at a high selectivity is provided which employs an isomerizing catalyst containing a Group VIII element. This method produces a fumarate, or a fumarate containing a 1-propenyloxy group in a high yield, which is useful in the fields of resin source materials and plasticizer. This method gives high-purity fumarates containing no catalyst residue by use of a heterogeneous catalyst which is readily separable and non-corrosive.

Abstract: Disclosed herein is a novel propenyl ether compound which can be cured by radical polymerization.