Multifunctional crosslinking agents and ophthalmic devices formed therefrom

A method for making an ophthalmic device, comprising:

• a) curing a monomeric mixture in a mold, the monomeric mixture comprising:
• (i) one or more multifunctional crosslinking agents comprising one or more repeating units of one or more siloxanyl units or one or more silyl-alkyl-siloxanyl units, and at least two ethylenically unsaturated reactive end groups, wherein one of the at least two ethylenically unsaturated reactive end groups is a (meth) acrylate-containing reactive end group or an acrylamide-containing reactive end group and the other one of the at least two ethylenically unsaturated reactive end groups is an allyl-containing reactive end group;
• (ii) one or more first ophthalmic device-forming comonomers having at least one reactive group that preferentially reacts with the (meth) acrylate-containing reactive end group or the acrylamide-containing reactive end group of the multifunctional crosslinking agent, wherein the one or more first ophthalmic device-forming comonomers comprise one or more silicone-containing comonomers represented by a structure of Formula I:
• wherein V is an ethylenically unsaturated polymerizable group, L is a linker group or a bond;
• R1, R2, R3, R4, R5, R6, R7, R8, and R9 are independently H, a C1 to C12 alkyl group, a halo alkyl group, a C3 to C12 cycloalkyl group, a heterocycloalkyl group, a C2 to C12 alkenyl group, a haloalkenyl group, or a C6 to C12 aromatic group;
• R10 and R11 are independently H or a C1 to C12 alkyl group, wherein at least one of R10 and R11 is hydrogen;
• y is 2 to 7 and n is 1 to 100;
• and
• (iii) one or more second ophthalmic device-forming comonomers having at least one reactive group that preferentially reacts with the allyl-containing reactive end group of the multifunctional crosslinking agent;
• and
• (b) dry releasing the ophthalmic device from the mold.