Polymerizable resin for forming clear, hard plastics

A resin composition for forming a coating upon an optical preform in a gasketless casting process, comprising:

• about 70-90% by weight of a bis(allyl) carbonate;
• between about 0.5% and 20% by weight of a viscosity control agent;
• between about 5% and 15% by weight of a polyfunctional acrylate cross-linking agent;
• and between about 0.5% and 6% of an initiator;
• wherein the resin has a viscosity greater than about 25 centistokes and less than about 130 centistokes at 68.degree. F.

A resin for forming a coating upon an optical preform in a gasketless casting process, comprising:

• about 50% to 90% by weight of a polymerizable base component;
• no more than about 25% by weight of a cross-linker;
• between about 0.5% and 6% by weight of an initiator;
• and between about 0.5% and 20% by weight of a viscosity control agent selected from the group consisting of fine mesh silica, fumed silica, acrylic acid ester polymers, polymethyl methacrylate molding powder, and mixtures thereof;
• wherein the resin has a viscosity greater than about 25 centistokes and less than about 130 centistokes at 68.degree. F.

A resin for forming a coating upon an optical preform in a gasketless casting process, comprising:

• from about 50% to about 90% by weight of a polymerizable allylic base component;
• no more than about 25% by weight of a cross-linker;
• between about 0.5% and 6% by weight of an initiator;
• and
• between about 0.5% and 20% by weight of a viscosity control agent;
• wherein the resin has a viscosity greater than about 25 centistokes and less than about 130 centistokes at 68.degree. F.

A resin for forming a coating upon an optical preform in a gasketless casting process, comprising:

• about 50% to 90% by weight of a polymerizable base component;
• no more than about 25% by weight of a cross-linker;
• and
• between about 0.5% and 6% by weight of an initiator;
• wherein the resin has a viscosity greater than about 25 centistokes and less than about 130 centistokes at 68.degree. F.