Photochromic compositions having improved fade rate

Details Photochromic compositions having improved fade rate Photochromic compositions having improved fade rate

C - Chemistry, Metallurgy

08

L

C08L 69/00 (2006.01) C08K 5/00 (2006.01) C08K 5/15 (2006.01) C08K 5/35 (2006.01) C08L 67/04 (2006.01) C09K 9/02 (2006.01)

Patent

CA 2240092

A thermoplastic molding composition is disclosed comprising (A) at least one resinous component selected from the group consisting of (i) a homogeneous blend of polycarbonate resin and polycaprolactone and (ii) a copoly(carbonate-lactone) copolymer, and (B) at least one compound selected from a group consisting of benzopyrans, naphthopyrans, spirobenzopyrans, spironaphthopyrans, spirobenzoxazines, spironaphthoxazines, fulgides and fulgimides. The composition which contains the photochromic compound at an amount of 0.01 to 1.0 parts per hundred parts of weight of said (A) exhibits good photochromic properties.

Divulgation d'une composition thermoplastique à mouler, comprenant : A) au moins un constituant résineux choisi parmi i) un mélange homogène de résine de polycarbonate et de polycaprolactone, et ii) un copolymère de carbonate et de lactone; et B) au moins un composé choisi dans un groupe comprenant des benzopyrannes, des naphtopyrannes, des spirobenzopyrannes, des spironaphtopyrannes, des spirobenzoxazines, des spironaphtoxazines, des fulgides et des fulgimides. La composition qui contient de 0,01 à 1,0 partie de composé photochrome par 100 parties, en poids, du composé A), possède de bonnes propriétés photochromes.

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