Liquid casting compositions, production processes and photochromic optical elements
AssigneeCarl Zeiss Vision Australia Holdings Limited
InventorFang Chen
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Abstract
The present invention provides a liquid casting composition for producing photochromic optical elements, the composition including: (i) an acrylate or methacrylate monomer; (ii) a photochromic compound; (iii) a terpinolene-based radical chain transfer agent; and (iv) a thermal free radical initiator. Also provided are methods for producing photochromic optical elements using the liquid casting composition and photochromic optical elements produced thereby. The photochromic optical elements include, for example, ophthalmic lenses.
Claims44
A casting composition for producing photochromic optical elements, the composition including:
- (i) an acrylate or methacrylate monomer,
- (ii) a photochromic compound,
- (iii) a terpinolene-based radical chain transfer agent, and
- (iv) a thermal free radical initiator,
- wherein the casting composition is a liquid
- and wherein the acrylate or methacrylate monomer includes a combination of a urethane acrylate or methacrylate monomer and at least one of:
- (a) a relatively hard polymer formed from a polyalkylene oxide acrylate or methacrylate monomer;
- and a relatively flexible polymer formed from a polyalkylene oxide acrylate or methacrylate monomer;
- or
- (b) a relatively flexible polymer formed from a polyalkylene oxide acrylate or methacrylate monomer;
- a polypropylene glycol acrylate or methacrylate monomer;
- a lauryl acrylate or methacrylate monomer;
- or a isostearyl acrylate or methacrylate monomer;
- and a relatively hard polymer formed from a bisphenol A ethoxylated diacrylate or methacrylate.
Dependencies are inferred from the claim text.