Curable liquid resin composition

1. A curable liquid resin composition comprising:

(A) a urethane(meth)acrylate having a structure originating from a polyol and a number average molecular weight of 800 g/mol or more, but less than 6,000 g/mol, and

(B) a urethane(meth)acrylate having a structure originating from a polyol and a number average molecular weight of 8,000 g/mol or more, but less than 18,000 g/mol,

wherein (A) differs from (B) in the molecular weight of the polyol used as the raw material, and wherein the total amount of the component (A) and component (B) is 20-95 wt % of the curable liquid resin composition and the content of the component (B) is 0.1-30 wt % of the total of the component (A) and component (B).

2. A curable liquid resin composition comprising:

according to claim 1 , wherein the total amount of the component (A) and component (B) is 30-95 wt % of the curable liquid resin composition.

3. The curable liquid resin composition according to claim 1 , wherein the structure originating from the polyol in the component (A) or component (B) is at least one structure originating from a polyester polyol or a polyether polyol which is selected from the group consisting of polypropylene glycol, a copolymer of 1,2-butylene oxide and ethylene oxide, and a copolymer of propylene oxide and ethylene oxide.

4. The curable liquid resin composition according to claim 1 , wherein both the component (A) and the component (B) have a structure originating from polypropylene glycol.

5. The curable liquid resin composition according to claim 1 , further comprising a polymerizable polyfunctional monomer.

6. The curable liquid resin composition according to claim 1 , wherein cured products made from the composition attached to each other can be detached with a detaching force of 5 N/m or less.

7. The curable liquid resin composition according claim 1 , wherein cured products made from the composition have a coefficient of friction of 0.8 or less.

8. The curable liquid resin composition according to claim 1 having a steady state compliance (J e ) of 2 MPa −1 or more.

9. The curable liquid resin composition according to claim 1 , the cured material obtained after curing said curable liquid resin composition having a Young's modulus of 30 MPa or more.

10. The curable liquid resin composition according to claim 1 , wherein the resin is colored.

11. A curable liquid resin composition system, said system comprising a primary resin composition and a secondary resin composition for use as an optical fiber dual coating system, wherein the secondary coating composition is the curable liquid resin composition according to claim 1 .

12. The curable liquid resin composition according to claim 1 which is a secondary resin composition, an ink material, a buffer material or a matrix material on an optical glass fiber.

13. A coated optical fiber comprising a glass optical fiber and at least one coating on said glass optical fiber which is derived from the curable liquid resin composition of claim 1 .

14. An optical fiber ribbon comprising a plurality of coated optical fibers according to claim 13 held together by a matrix material.

15. An optical fiber ribbon comprising a plurality of coated and optionally inked optical fibers held together by a matrix material, wherein the matrix material is derived from the curable liquid resin composition of claim 1 .

16. The optical fiber ribbon of claim 14 , wherein said plurality of coated optical fibers are inked.

17. The optical fiber ribbon of claim 15 , wherein said plurality of coated optical fibers are inked.