Primer composition for optical articles, and laminate
A primer composition for optical articles includes (A) a urethane prepolymer which is a reaction product of an aromatic polyisocyanate compound and a polyol compound, and which has a reactive group at an end, the reactive group being selected from among an isocyanate group and a hydroxyl group, (B) a light absorbing compound which has a maximum absorption wavelength within the range of from 320 nm to 650 nm (inclusive) and (C) an organic solvent which has a solubility parameter of 8 (cal/cm 3 ) 1/2 or more, while containing no active hydrogen.
1. A primer composition for an optical article comprising:
a urethane prepolymer (A) which is a reaction product of an aromatic polyisocyanate compound and a polyol compound and has a reactive group at a terminal end selected from the group consisting of an isocyanate group and a hydroxyl group,
a light-absorbing compound (B) having a local maximum light-absorption wavelength between 320 nm or more and 650 nm or less,
an organic solvent (C) having a solubility parameter of 8 [(cal/cm 3 ) 1/2 ] or more and has no active hydrogen, and
wherein a weight average molecular weight of the urethane prepolymer (A) is 10,000 to 100,000.
2. The primer composition for the optical article according to claim 1 , wherein a mass of the reactive group of the urethane prepolymer (A) is within a range of 0.02 to 0.2 g per 1 g of the urethane prepolymer (A).
3. The primer composition for the optical article according to claim 1 including 0.01 to 20 parts by mass of the light-absorbing compound (B) and 100 to 1000 parts by mass of the organic solvent (C) per 100 parts by mass of the urethane prepolymer (A).
4. The primer composition for the optical article according claim 1 , wherein the urethane prepolymer (A) is a reaction product of an aromatic polyisocyanate compound, a polyol compound, and a chain extender.
5. The primer composition for the optical article according to claim 1 , wherein the light-absorption compound (B) includes a component (B1) having a local maximum light-absorption wavelength of more than 400 nm and 450 nm or less.
6. The primer composition for the optical article according to claim 5 , wherein the component (B1) includes a porphyrin compound.
7. The primer composition for the optical article according to claim 1 , wherein the light-absorbing compound (B) includes an ultraviolet absorber (B2) having a maximum light-absorption wavelength of 320 nm or more and 400 nm or less.
8. The primer composition for the optical article according to claim 1 , wherein the light-absorbing compound (B) further includes a dye (B3) having a maximum light-absorption wavelength of 540 nm or more and 650 nm or less.
9. The primer composition for the optical article according to claim 1 further including a leveling agent (D).
10. The primer composition for the optical article according to claim 1 , wherein the reactive group of the urethane prepolymer (A) is an isocyanate group and the urethane prepolymer (A) is a moisture curing polymer which cures by moisture in air.
11. The primer composition for the optical article according to claim 1 , wherein the reactive group of the urethane prepolymer (A) is a hydroxyl group and further includes a curing agent (E) having a plurality of isocyanate groups in a molecule.
12. The primer composition for the optical article according to claim 1 , wherein the reactive group of the urethane prepolymer (A) is an isocyanate group and further includes a curing agent (E′) having a plurality of functional groups reactable with an isocyanate group in a molecule.
13. A primary multilayer body having a primer layer made of the primer composition according to claim 1 on a surface of an optical substrate and a thickness of the primer layer is 0.1 to 20 μm.
14. The primary multilayer body according to claim 13 , wherein a transmittance at a wavelength of 420 nm is 80% or less.
15. A secondary multilayer body having a hard coat layer including inorganic particles on the primer layer of the primary multilayer body according to claim 13 .
16. The primer composition for an optical article according to claim 1 , wherein the light-absorbing compound (B) includes:
a dye (B3) having a maximum light-absorption wavelength of 540 nm or more and 650 nm or less, and
at least one selected from the group consisting of a component (B1) having a local maximum light-absorption wavelength of more than 400 nm and 450 nm or less and an ultraviolet absorber (B2) having a maximum light-absorption wavelength of 320 nm or more and 400 nm or less.