Material for ocular lens

An ocular lens material comprising a copolymer prepared by polymerization with heating of a monomer mixture and/or with irradiating a monomer mixture with ultraviolet ray by means of a molding method, said monomer mixture containing, as main components,

• (A) a polysiloxane macromonomer in which a polymerizable group bonds to a siloxane main chain through at least one urethane bond, and which is represented by the formula (I):
• A1-U1—(—S1—U2—)n—S2—U3-A2 (I)
• wherein A1 is a group represented by the formula (II):
• Y21—Z21—R31— (II)
• in which Y21 is acryloyl group, vinyl group or allyl group, Z21 is oxygen atom or direct bond, and R31 is direct bond or a linear, branched or aromatic alkylene group having 1 to 12 carbon atoms;
• A2 is a group represented by the formula (III):
• R34—Z22—Y22— (III)
• in which Y22 is acryloyl group, vinyl group or allyl group, Z22 is oxygen atom or direct bond, and R34 is direct bond or a linear, branched or aromatic alkylene group having 1 to 12 carbon atoms, where Y21 in the formula (II) and Y22 in the formula (III) may be the same or different;
• U1 is a group represented by the formula (IV):
• —X21—E21—X25—R32 (IV)
• in which each of X21 and X25 is independently selected from direct bond, oxygen atom or an alkylene glycol group having 1 to 6 carbons, E21 is —NHCO— group (in this case, X21 is direct bond, X25 is oxygen atom or an alkylene glycol group having 1 to 6 carbons and E21 and X25 form urethane bond), —CONH— group (in this case, X21 is oxygen atom or an alkylene glycol group having 1 to 6 carbons, X25 is direct bond and E21 and X21 form urethane bond) or a divalent group derived from a diisocyanate selected from a saturated or unsaturated aliphatic diisocyanate, an alicyclic diisocyanate or an aromatic diisocyanate (in this case, each of X21 and X25 is independently selected from oxygen atom and an alkylene glycol group having 1 to 6 carbons and B21 and X21, E21 and X25form two urethane bonds, respectively) and R32 is a linear or bra nched alkylene group having 1 to 6 carbon atoms;
• each of S1 and S2 is independently a group represented by the formula (V):
• in which each of R23, R24, R25, R26, R27 and R28 is independently an alkyl group having 1 to 6 carbon atoms, an alkyl group of 1 to 6 carbons substituted with fluorine atom, or a phenyl group, K is an integer of 1 to 1,500, L is 0 or an integer of 1 to 1,499, and K+L is an integer of 1 to 1,500;
• U2 is a group represented by the formula (VI):
• —R37—X27-E24—X28—R38tm (VI)
• in which each of R37 and R38 is independently a linear or branched alkylene group having 1 to 6 carbon atoms, each of X27 and X28 is independently oxygen atom or an alkylene glycol group having 1 to 6 carbons, and E24 is a divalent group derived from a diisocyanate selected from a group of a saturated or unsaturated aliphatic diisocyanate, an alicyclic diisocyanate and an aromatic diisocyanate (in this case, E24 and X27, B24 and X28 form two urethane bonds, respectively);
• U3 is a group represented by the formula (VII):
• —R33—X26-E22—X22— (VII)
• in which R33 is a linear or branched alkylene group having 1 to 6 carbon atoms, each of X22 and X26 is independently selected from direct bond, oxygen atom and an alkylene glycol group, B22 is —NHCO— group (in this case, X22 is oxygen atom or an alkylene glycol group having 1 to 6 carbons, X26 is oxygen atom or an alkylene glycol group having 1 to 6 carbons and B22 and X26 form urethane bond) or a divalent group derived from a diisocyanate selected from a saturated or unsaturated aliphatic diisocyanate, an alicyclic diisocyanate or an aromatic diisocyanate (in this case, each of X22 and X26 is independently oxygen atom or an alkylene glycol group having 1 to 6 carbons and E22 and X22, E22, and X26 form two urethane bonds, respectively);
• and n is 0 or an integer of 1 to 10,
• (B) a silicon-containing alkyl methacrylate,
• (C) a hydrophilic monomer comprising
• (C-1) N-vinylpyrrolidone and
• (C-2) a hydrophilic monomer excepting N-vinylpyrrolidone (C-i), containing acryloyl group, vinyl group or allyl group;
• (D) at least one monomer selected from an alkyl (meth)acrylate and a fluorine-containing alkyl (meth)acrylate;
• and
• (E) a crosslinkable monomer comprising
• (E-1) a crosslinkable monomer containing a methacryloyl group, and at least one group selected from the group consisting of acryloyl group, vinyl group and allyl group, and
• (E-2) a crosslinkable monomer containing at least two methacryloyl groups, wherein the weight ratio of the total of the polysiloxane macromonomer (A) and the silicon-containing alkyl methacrylate (B) to the hydrophilic monomer (C), the total weight of (A) and (B)/the weight of(C), is 30/70 to 70/30, the weight ratio of the polysiloxane macromonomer (A) to the silicon-containing alkyl methacrylate (B), the weight of(A)/the weight of(B), is 25/75 to 75/25, the weight ratio of N-vinylpyrrolidone (C-1) to the hydrophilic monomer (C-2), the weight of(C-1)/the weight of (C-2), is 50/50 to 100/0, and the amount of the monomer (D) in the monomer mixture is 0 to 20% by weight;
• and further wherein
• the amount of the crosslinkable monomer (E) is at least 1 part by weight based on 100 parts by (weight in total of the polysiloxane macromonomer (A), the silicon-containing alkyl methacrylate (B), the hydrophilic monomer (C) and the monomer (D), and
• α, which is the total number of moles of acryloyl group, vinyl group and ally group in the hydrophilic monomer (C) and the monomer (D);
• β, which is the total number of moles of methacryloyl group in the silicon-containing alkyl methacrylate (B) and the monomer (D);
• γ, which is the total number of moles of acryloyl group, vinyl group and ally group in the polysiloxane macromonomer (A) and the crosslinkable monomer (E);
• and δ, which is the total number of moles of methacryloyl group in the crosslinkable monomer (E),
• satisfy both conditions of α/γ=20 to 80 and β/δ=15 to 30.