Polymerizable resin for forming clear, hard plastics

Details Polymerizable resin for forming clear, hard plastics Polymerizable resin for forming clear, hard plastics

1992-05-01

1995-11-28

Vargot, Mathieu D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Compositions to be polymerized by wave energy wherein said...

264 138, 264 17, 522 71, 523300, 524492, B29D 1100, C08F 2602

Patent

active

054708923

ABSTRACT:
A photopolymerizable resin is formed from between about 50% to 90% by weight of a polymerizable base component, between about 1% and 20% by weight of a cross-linker, between about 0.5% and 6% by weight of a photoinitiator, and between about 0.5% and 20% by weight of a viscosity control agent. Preferably the resin has a viscosity above 25 and below 130 centistokes at 68.degree. F. In a preferred embodiment, the resin includes between about 0.5% and 3.0% by weight of fumed silica or fine mesh silica as a viscosity control agent, and is cured under the combined influence of heat and actinic radiation to form a clear, hard, plastic optic having a refractive index of greater than or equal to 1.50 and a scratch resistance greater than or equal to 1.0 in a Bayer abrader and hazemeter. A method and apparatus for forming improved ophthalmic lenses is also included.

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