Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1997-12-11
1999-11-16
Pezzuto, Helen L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525464, C08L 5300
Patent
active
059860014
ABSTRACT:
A gas permeable (GP) ocular lens composition and method of formation are disclosed wherein 98-70% by wgt. of a first polymer component, selected for desired characteristics including gas permeability, and 2-30% by wgt. of a second polymer component, selected for basic GP lens characteristics such as rigidity, structural stability and desired refractive index, are combined in an interpenetrating polymer network (IPN) structure forming a thermoplastic composition having optical clarity/compatibility and facilitating low cost formation by molding or thermoforming. The first polymer component is a block co-polymer from first and second monomers. The resulting lens composition has a flexure modulus in the range of about 2,000-50,000 psi; preferably about 5,000-40,000 psi; and more preferably about 20,000-40,000 psi. In one embodiment, the lens comprises a central portion and an annular portion of different characteristics. In another cosmetic embodiment, a film with an image of an iris is encapsulated in the composition.
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Ingenito Donald R.
Rugge Henry F.
Soane David S.
Sturm William L.
Pezzuto Helen L.
Rasor Associates, Inc.
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