High index/high Abbe number composition
AssigneeSola International Holdings Ltd.
InventorsHuan Kiak Toh, Ian Roger Bateman, David Robert Diggins, Bohdan Grzegorz Cieslinski
Life of this patent
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Abstract
A cross-linkable polymeric casting composition including an effective amount of A: an acrylic or methacrylic monomer which provides high rigidity and low colour dispersion (High Abbe number) to the final product; B: a di- or polythio compound; C: a di- or polyvinyl monomer; and optionally D: a polymerisable comonomer.
Claims13
A method for preparing a polymeric optical article having a refractive index in the range of approximately 1.58 to 1.70, which method includes providing
- a cross-linkable polymeric casting composition including an effective amount of
- A:
- an acrylic or methacrylic monomer which provides high rigidity and low colour dispersion characterized by an Abbe number of at least 35 to the final product;
- B:
- a di- or polythio compound;
- C:
- a di- or polyvinyl monomer;
- and optionally
- D:
- a polymerisable comonomer;
- and
- E:
- a heat and/or UV curing agent;
- mixing the polymeric casting composition and curing agent;
- and
- subjecting the mixture to a cross-inking step, wherein the acrylic or methacrylic monomer is selected from an acrylate or methacrylate derivative of the formula ##STR35## where R can be H or CH.sub.3 a= 1-3, b=1-3, m=0-6, n=0-6,
- S is a spacer group selected from one or more of the following ##STR36## or derivatives thereof;
- and wherein p=1-4.
An optical article having a high exhibiting rigidity, an Abbe number of at least 35 and a refractive index in the range of from approximately 1.58 to 1.70 prepared from a cross-linkable polymer casting composition including effective amounts of
- A:
- an acrylic or methacrylic monomer which provides high rigidity and an Abbe number of at least 35 to the final product;
- B:
- a di- or polythio compound;
- C:
- a di- or polyvinyl monomer;
- and optionally
- D:
- a polymerisable comonomer
- wherein the acrylic or methacrylic monomer is selected from an acrylate or methacrylate derivative of the formula ##STR37## where R can be H or CH.sub.3 a= 1-3, b=1-3, m=0-6, n=0-6,
- S is a spacer group selected from one or more of the following ##STR38## or derivatives thereof;
- and wherein p=1-4.
A method according to claim 11 wherein the optical article has a refractive index in the range of approximately 1.6 to 1.70.
Dependencies are inferred from the claim text.