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A hardcoat agent composition comprising a fluorine-containing polyether compound (A) having a perfluoropolyether unit, urethane bond and active energy ray reactive group and a curable compound (B) having equal to or more than 2 active energy ray polymerizing groups in the molecule. An optical inform

A hardcoat agent composition comprising a fluorine-containing polyether compound (A) having a perfluoropolyether unit, urethane bond and active energy ray reactive group and a curable compound (B) having equal to or more than 2 active energy ray polymerizing groups in the molecule. An optical information medium having a film substance composed of single or multiple layers containing at least the recording layer 4 or the reflecting layer on the supporting substrate 20, the optical information medium wherein at least either the surface of the supporting substrate 20 or that of the above-mentioned film substance is formed by the hardcoat layer 8 containing a curable substance of the above-mentioned hardcoat agent composition.

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The invention claimed is: 1. A hardcoat agent composition which comprises: a fluorine-containing polyether compound (A) having a perfluoropolyether unit, an urethane bond and at least two active energy ray reactive groups at each of both ends of the molecular chain including said perfluoropolyether

The invention claimed is: 1. A hardcoat agent composition which comprises: a fluorine-containing polyether compound (A) having a perfluoropolyether unit, an urethane bond and at least two active energy ray reactive groups at each of both ends of the molecular chain including said perfluoropolyether unit; and a curable compound (B) having equal to or more than two active energy ray polymerizing groups in the molecule; and inorganic microparticles (C) with a mean particle diameter of 100 nm or less, wherein the fluorine-containing polyether compound (A) is contained in a range from 0.01 parts by weight or greater to 3 parts by weight or less in relation to 100 parts by weight of a nonvolatile part in the said composition, and wherein the curable compound (B) contains 65 to 100% by weight of a curable compound (Bt) having three or more active energy ray polymerizing groups in the molecule and 0 to 35% by weight of a curable compound (Bd) having two active energy ray polymerizing groups in the molecule on the basis of the curable compound (B), and wherein the curable compound (B) contains no fluorine atoms. 2. The hardcoat agent composition according to claim 1, wherein the fluorine-containing polyether compound (A) has the number average molecular weight ranging from 500 or greater to 10,000 or less on the basis of polystyrene standard determined by GPC (Gel Permeation Chromatography). 3. The hardcoat agent composition according to claim 1, wherein the active energy ray reactive groups contained in the fluorine-containing polyether compound (A) are selected from the group consisting of an (meth)acryloyl group and vinyl group. 4. The hardcoat agent composition according to claim 1, wherein the fluorine-containing polyether compound (A) is a compound in which (meth)acryloyl groups are introduced via urethane bond into a hydroxyl group of a fluorine-containing polyether compound having said hydroxyl group at each of the both ends of a perfluoropolyether unit. 5. The hardcoat agent composition according to claim 1, wherein the inorganic microparticles (C) ranging from 5 parts by weight or greater to 500 parts by weight or less are contained in relation to 100 parts by weight of the curable compound (B). 6. The hardcoat agent composition according to claim 1, wherein the inorganic microparticles (C) are microparticles of metal or semi-metal oxide or microparticles of metal or semi-metal sulfide. 7. The hardcoat agent composition according to claim 1, wherein the inorganic microparticles (C) are silica microparticles. 8. The hardcoat agent composition according to claim 1, wherein the inorganic microparticles (C) are surface-modified by a hydrolyzable silane compound having an active energy ray reactive group.