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US 5,776,376 AGranted
Photochromic curable composition
AssigneeTokuyama Corporation
InventorsHironobu Nagoh, Satoshi Imura, Takashi Kobayakawa
Life of this patent
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Abstract
A photochromic curable composition obtained by adding (E) an .alpha.-methylstyrene dimer and (F) a photochromic compound to polymerizable monomers comprising (A) a compound having at least one epoxy group in the molecule, such as glycidyl methacrylate or the like, (B) a polypropylene glycol di(meth)acrylate monomer, (C) a polyethylene glycol di(meth)acrylate monomer and (D) a (meth)acrylate monomer and/or a styryl monomer. This composition is superior in moldability when cured and gives a cured product of excellent durability in photochromism.
Claims14
A photochromic curable composition comprising
- a polymerizable monomer composed of 0.1 to 30 parts by weight of (A) a compound having at least one epoxy group in the molecule,
- 30 to 70 parts by weight of (B) a polypropylene glycol di(meth)acrylate monomer represented by the following general formula (I):
- ##STR22## wherein R.sup.1 is a hydrogen atom or a methyl group, and a and b are each independently a number of 0 to 7 with a proviso that (a+b) =2 to 7,
- 20to 60 parts by weight of (C) apolyethylene glycol di(meth)acrylate monomer represented by the following general formula (II):
- ##STR23## wherein R.sup.1 is a hydrogen atom or a methyl group, and c is an integer of 2 to 9, and
- 0to 35 parts by weight of (D) a (meth)acrylate monomer and/or a styryl monomer, the total of the components (A), (B), (C) and (D) being 100 parts by weight, and
- 0.1 to 2 parts by weight, based on 100 parts by weight of the polymerizable monomer, of (E) an .alpha.-methylstyrene dimer, and
- 0.001 to 10 parts by weight, based on 100 parts by weight of the polymerizable monomer, of (F) a photochromic compound.
5 more elements
Dependencies are inferred from the claim text.