Curable resin composition
A curable resin composition, which is a solid resin at ordinary temperatures obtained by reacting an epoxy resin with a (meth)acrylic anhydride, contains an unsaturated resin having a (meth)acryloyl group (A) which has a double bond equivalent weight of 200 to 500, an ester number of 100 to 300, and a hydroxyl number of no more than 130, an ethylenically unsaturated monomer (B), and a radical polymerization initiator (C).
1. A curable resin composition comprising,
an unsaturated resin (A) having a methacryloyl group, the unsaturated resin (A) being a solid resin at ordinary temperatures produced by reacting at least one of a dicyclopentadiene-based novolac epoxy resin and a biphenyl-based novolac epoxy resin with only methacrylic anhydride or with only methacrylic acid and methacrylic anhydride, the unsaturated resin (A) having a double bond equivalent weight of 210 to 400, an ester number of 100 to 300, and a hydroxyl number of no more than 130;
an ethylenically unsaturated monomer (B) selected from a group consisting of styrene, t-butylstyrene, vinylnaphthalene, vinylbiphenyl, pentafluorostyrene, vinylpyrene, vinylthiophene, vinylcarbazole, divinylbenzene, divinylnaphthalene, divinylbiphenyl, dicyclopentenyl methacrylate, dicyclopentenyloxyethyl methacrylate, dicyclopentanyl methacrylate, adamantane methacrylate, 1,10-dodecanediol dimethacrylate, cyclohexanedimethanol dimethacrylate, and tricyclodecanedimethanol dimethacrylate; and
a radical polymerization initiator (C);
wherein the viscosity of resin (A), which is solid at ordinary temperatures, can be measured when dissolved in the ethylenically unsaturated monomer (B), with the viscosity preferably being in a range of 500 to 15,000 mPa·s at 25° C.
2. The curable resin composition according to claim 1 , wherein a number average molecular weight of said unsaturated resin (A) is from 900 to 5,000.
3. The curable resin composition according to claim 1 , wherein a sum of a hydroxyl number and an ester number of said unsaturated resin (A) is from 120 to 320.
4. The curable resin composition according to claim 1 , wherein a hydroxyl number of said unsaturated resin (A) is from 20 to 130.
5. The curable resin composition according to claim 1 , wherein said unsaturated resin comprises from 20 to 80% by mass of aromatic ring structural units and/or aliphatic alicyclic ring structural units.
6. A molding material, comprising a curable resin composition according to claim 1 , and further comprising a reinforcing agent and/or a filler (D).
7. A fuel cell separator produced by molding a molding material according to claim 6 .
8. A molding material for producing a fuel cell separator, comprising a curable resin composition according to claim 1 , and further comprising a conductive carbon-based material and a polyisocyanate compound.
9. The curable resin composition according to claim 1 , wherein the viscosity of resin (A), dissolved in the ethylenically unsaturated monomer (B), is in a range of 500 to 15,000 mPa·s at 25° C.
10. The curable resin composition according to claim 1 , wherein the viscosity of resin (A), dissolved in the ethylenically unsaturated monomer (B), is in a range of 500 to 15,000 mPa·s at 25° C. in a mixed solution containing 80% by mass of the unsaturated resin (A) and 20% by mass of ethylenically unsaturated monomer (B).
11. A curable resin composition comprising,
an unsaturated resin (A) having a methacryloyl group, the unsaturated resin (A) being a solid resin at ordinary temperatures produced by reacting a biphenyl-based novolac epoxy resin with only methacrylic anhydride or with only methacrylic acid and methacrylic anhydride, the unsaturated resin (A) having a double bond equivalent weight of 210 to 400, an ester number of 100 to 300, and a hydroxyl number of no more than 130;
an ethylenically unsaturated monomer (B); and
a radical polymerization initiator (C);
wherein the viscosity of resin (A), which is solid at ordinary temperatures, can be measured when dissolved in the ethylenically unsaturated monomer (B), with the viscosity preferably being in a range of 500 to 15,000 mPa·s at 25° C.