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1. (WO2019029794) CURABLE PHOTOCHROMIC COMPOSITION INCLUDING A SEGMENTED POLYMER
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WHAT IS CLAIMED IS:

1. A curable photochromic composition comprising:

(a) a photochromic compound;

(b) a segmented polymer comprising active hydrogen groups, at least one first segment, and at least one second segment, wherein:

(i) each first segment independently comprises a (meth)acrylic polymer segment, and

(ii) each second segment independently comprises at least one of, a polycarbonate segment, a polyester segment, a polyether segment, and a polyurethane segment; and

(c) a curing agent comprising reactive functional groups that are reactive with the active hydrogen groups of the segmented polymer, wherein the curing agent comprises at least one of, a polyisocyanate, a polyisothiocyanate, and an aminoplast.

2. The curable photochromic composition of claim 1, wherein: the segmented polymer has an active hydrogen equivalent weight of from 1000 to 7000 g/eq, and

each active hydrogen group of the segmented polymer is independently selected from hydroxyl, thiol, primary amine, and secondary amine.

3. The curable photochromic composition of claim 2, wherein each active hydrogen group of the segmented polymer is hydroxyl.

4. The curable photochromic composition of claim 1, wherein at least one first segment and at least one second segment are covalently bonded to each other by a linking group selected from the group consisting of a carboxylic acid ester linking group, a thioester linking group, an amide linking group, a urethane linking group, a thiourethane linking group, a urea linking group, a thiourea linking group, a carbonate linking group, an ether linking group, and a thioether linking group.

5. The curable photochromic composition of claim 1 , wherein the second segment is present in the segmented polymer in an amount of from 60 percent by weight to 95 percent by weight, based on total weight of the segmented polymer.

6. The curable photochromic composition of claim 5, wherein the curable photochromic composition comprises a total amount of second segments of from 20 percent by weight to 50 percent by weight, based on total solids weight of the curable photochromic composition.

7. The curable photochromic composition of claim 1 , wherein each second segment independently comprises at least one of, said polycarbonate segment, a polycarbonate-polyester segment, a polycarbonate -polyurethane segment, and a polycarbonate-polyester-polyurethane segment.

8. The curable photochromic composition of claim 1, wherein:

the curing agent comprises at least one of the polyisocyanate and the polyisothiocyanate,

each reactive functional group of the curing agent is independently selected from isocyanate and isothiocyanate, and

a molar ratio of reactive functional groups of the curing agent to active hydrogen groups of the segmented polymer is at least 5: 1.

9. The curable photochromic composition of claim 8, wherein the molar ratio of reactive functional groups of the curing agent to active hydrogen groups of the segmented polymer is at least 6: 1 and less than or equal to 60: 1.

10. The curable photochromic composition of claim 8, wherein the curing agent comprises the polyisocyanate, and each reactive functional group of the curing agent is selected from isocyanate.

11. The curable photochromic composition of claim 10, wherein the polyisocyanate comprises at least one of, linear or branched aliphatic polyisocyanates, cycloaliphatic polyisocyanates, dimers thereof, and trimers thereof.

12. The curable photochromic composition of claim 10, wherein at least some of the reactive functional groups of the curing agent are blocked with a blocking agent, and each blocking agent is independently selected from the group consisting of methylethyl ketoxime, pyrazole, and dialkyl pyrazole.

13. The curable photochromic composition of claim 1, wherein the photochromic compound is selected from the group consisting of naphthopyrans, benzopyrans, phenanthropyrans, indenonaphthopyrans, spiro(indoline)naphthoxazines, spiro(indoline)pyridobenzoxazines, spiro(benzindoline)pyridobenzoxazines, spiro(benzindoline)naphthoxazines, spiro(indoline)-benzoxazines, fulgides, fulgimides, and mixtures of such photochromic compounds.

14. An article comprising:

(A) a substrate; and

(B) a photochromic layer over at least one surface of the substrate, wherein the photochromic layer is formed from the curable photochromic composition of claim 1.

15. A photochromic multilayer article comprising at least one photochromic layer formed from the curable photochromic composition of claim 1.