Curable photochromic composition
AssigneeTransitions Optical, Inc.
InventorsRamaiahgari Reddy, Anil Kumar
Life of this patent
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Abstract
The invention relates to a curable photochromic composition including (a) a photochromic material, (b) an active hydrogen group-containing component of (i) an active hydrogen group-containing fluorinated polymer having an active hydrogen group equivalent weight ranging from 200 to 5000 g/mole and a number average molecular weight ranging from 5,000 to 50,000 g/mole, and (ii) a polymer having at least two active hydrogen groups per molecule, a number average molecular weight of at least 1000 g/mole, and an equivalent weight of at least 500 g/mole; and (c) a curing agent having functional groups which are reactive with active hydrogen groups. Also provided are photochromic articles.
Claims15
A curable photochromic composition comprising:
- (a) at least one photochromic material;
- (b) an active hydrogen group-containing component comprising:
- (i) an active hydrogen group-containing fluorinated polymer having an active hydrogen group equivalent weight ranging from 200 to 5000 g/mole and a number average molecular weight ranging from 5,000 to 50,000 g/mole, and
- (ii) a polymer having at least two active hydrogen groups per molecule, a number average molecular weight of at least 1000 g/mole, and an equivalent weight of at least 500 g/mole;
- and
- (c) a curing agent comprising functional groups which are reactive with active hydrogen groups.
An article comprising:
- (A) a substrate;
- and
- (B) a photochromic layer over at least a portion of the substrate, wherein the photochromic layer is formed from a curable photochromic composition comprising:
- (a) at least one photochromic material;
- (b) an active hydrogen group-containing component comprising:
- (i) an active hydrogen group-containing fluorinated polymer having an active hydrogen group equivalent weight ranging from 200 to 5000 g/mole and a number average molecular weight ranging from 5,000 to 50,000 g/mole, and
- (ii) a polymer having at least two active hydrogen groups per molecule, a number average molecular weight of at least 1000 g/mole, and an equivalent weight of at least 500 g/mole;
- and
- (c) a curing agent comprising functional groups which are reactive with active hydrogen groups.
Dependencies are inferred from the claim text.