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US 5,702,825 AGranted
Low yellow index polymer compositions, polymerizable compositions and lenses using said compositions
AssigneeEssilor International (Compagnie Generale d'Optique)
InventorsGabriel Keita, Joel Renaudineau, Leanirith Yean
Life of this patent
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Abstract
The present invention relates to a new polymer compositions for use in the manufacture of ophthalmic lenses, to their use in ophthalmology and to apparatus using these lenses, such as eyepieces and film/video camera optics.
Claims32
A polymer composition obtained by polymerisation of a composition comprising:
- a component A comprising:
- .cndot.at least 50% by weight of a monomer or mixture of monomers having formula I:
- ##STR11## wherein R.sub.1 and R.sub.2, which may be identical or different, represent hydrogen of C.sub.1 -C.sub.6 alkyl, X represents:
- ##STR12## m and n are integers and m+n is between 0 and 10;
- 0to 50% by weight of one or more mono- or polyfunctional vinyl, acrylic or methacrylic comonomers (II);
- and
- a component B comprising:
- .cndot.in a proportion of 0.05 to 15% by weight with respect to the weight of components (I) and (II), at least one monomer (III) comprising an ethylenic unsaturation which does not form part of an aromatic ring and containing in position .alpha. of this unsaturation, a carbon atom carrying a free hydroxy group.
5 more elements
A polymiserable composition comprising at least 50% by weight of a monomer or mixture of monomers having formula I:
- ##STR17## wherein R.sub.1 and R.sub.2, which may be identical or different, represent hydrogen or C.sub.1 -C.sub.6 alkyl, X represents:
- ##STR18## m and n are integers and m+n is between 0 and 10;
- 0to 50% by weight of one or more mono- or polyfunctional vinyl, acrylic or methacrylic comonomers (II);
- and
- a component B comprising:
- .cndot.in a proportion of 0.05 to 15% by weight with respect to the weight of components (I) and (II), at least one monomer (III) comprising an ethylenic unsaturation which does not form part of an aromatic ring and containing in position .alpha. of this unsaturation, a carbon atom carrying a free hydroxy group.
3 more elements
Dependencies are inferred from the claim text.