High adhesion acrylate coating for a photochromic ophthalmic lens
View Patent ↗A method and coating used to prepare a photochromically-enabled bifocal ophthalmic lens. The coating is a high adhesive strength acrylate-based coating that contains a small quantity of a polycarbonate-based TPU. The coating is applied to produce an intermediate imbibable bifocal surface. A photochromic solution is subsequently imbibed by contact with the bifocal surface.
1. An imbibable thermoset composition comprising:
(1) at least one monofunctional (meth)acrylate;
(2) at least one multifunctional (meth)acrylate;
(3) at least one difunctional (meth)acrylate
(4) at least one aliphatic urethane diacrylate;
(5) at least one metal salt;
(6) at least one initiator; and
(7) at least one thermoplastic polyurethane (TPU) being present in an amount of about 1.0 phm.
2. The composition of claim 1 , wherein the monofunctional (meth)acrylate is selected from the group consisting of isobornyl acrylate, methyl methacrylate, benzyl methacrylate, benzyl acrylate hydroxypropyl methacrylate, 2-phenoxyethyl methacrylate, and combinations thereof.
3. The composition of claim 1 , wherein the monofunctional (meth)acrylate is benzyl acrylate.
4. The composition of claim 1 , wherein the multifunctional (meth)acrylate is selected from the group consisting of dipentaerythritol hexaacrylate, dipentaerythritol pentaacrylate, hexafunctional aliphatic urethane acrylate, and combinations thereof.
5. The composition of claim 1 , wherein the multifunctional (meth)acrylate is dipentaerythitol pentaacrylate.
6. The composition of claim 3 , wherein the multifunctional (meth)acrylate is dipentaerythitol pentaacrylate.
7. The composition of claim 1 , wherein the difunctional (meth)acrylate is selected from the group consisting of 1,6-hexanediol diacrylate, ethoxylated bisphenol A di(meth)acrylate, polyethylene glycol di(meth)acrylate and combinations thereof.
8. The composition of claim 1 , wherein the metal salt includes cobalt naphthenate.
9. The composition of claim 1 , wherein the initiator is tert-butylperoxybenzoate.
10. The composition of claim 6 , wherein the initiator is tert-butylperoxybenzoate.
11. The composition of claim 1 , wherein the thermoplastic polyurethane comprises a polycarbonate-based aliphatic polyurethane having a Specific gravity of between 1.0 and 1.3; a Flexural modulus between 550 and of 690 psi; an Ultimate Tensile of between 4,000 and 6.000 psi; and Mold shrinkage of 0.006-0.014 in/in.
12. An imbibable thermoset composition comprising:
(1) at least one monofunctional (meth)acrylate being present in an amount of about 5% to 40% by weight;
(2) at least one multifunctional (meth)acrylate being present in an amount of about 5% to 50% by weight;
(3) at least one difunctional (meth)acrylate being present in an amount of about 5% to 50% by weight;
(4) at least one aliphatic urethane diacrylate being present in an amount of about 5% to 60% by weight;
(5) at least one metal salt being present in an amount about 0.05 to 2.0 phm;
(6) at least one initiator being present in an amount of about 0.1 to 5.0 phm; and
(7) at least one thermoplastic polyurethane (TPU) being present in an amount of about 0.5 phm to 5.0 phm.
13. An imbibable thermoset composition comprising:
(1) at least one monofunctional (meth)acrylate being present in an amount of about 10 to 20% by weight;
(2) at least one multifunctional (meth)acrylate being present in an amount of about 10 to 35% by weight;
(3) at least one difunctional (meth)acrylate being present in an amount of about 10% to 35% by weight;
(4) at least one aliphatic urethane diacrylate being present in an amount of about 30% to 50% by weight;
(5) at least one metal salt;
(6) at least one initiator; and
(7) at least one thermoplastic polyurethane (TPU).
14. The composition of claim 1 , further comprising:
said at least one metal salt being present in an amount about 0.25 phm; and
said at least one initiator being present in an amount of about 1.5 phm.
15. The composition of claim 12 , further comprising:
said at least one metal salt being present in an amount of about 0.25 phm; and
said at least one initiator being present in an amount of about 1.5 phm.
16. The composition of claim 12 , further comprising:
said at least one thermoplastic polyurethane (TPU) being present in an amount of about 1.0 phm.
17. The composition of claim 13 , further comprising:
said at least one thermoplastic polyurethane (TPU) being present in an amount of about 1.0 phm.
18. The composition of claim 13 , further comprising:
said at least one metal salt being present in an amount of about 0.25 phm: and
said at least one initiator being present in an amount of about 1.5 phm.