C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 175/04 (2006.01) C08G 18/44 (2006.01) G03C 1/685 (2006.01)
Patent
CA 2397969
Described are photochromic polyurethane coatings having improved durability as demonstrated by reduced swelling upon exposure to alcoholic solvents in the Percent Swelling Test. The coatings are prepared using polycarbonate polyols alone or in combination with different polyols as the source of hydroxyl groups. Also described are articles having such coatings. The coatings exhibit a Fischer microhardness of from 50 to 150 Newtons per mm2 and good photochromic properties.
L'invention se rapporte à des revêtements de polyuréthanne photochromiques dotés d'une durabilité améliorée ainsi que le montre une tendance réduite au gonflement lors de l'exposition à des solvants alcooliques au cours d'essais de gonflement en pourcentage. Ces revêtements sont préparés à partir de polyols de polycarbonate utilisés soit seuls soit en association à des polyols différents jouant le rôle de source de groupes hydroxyles. L'invention se rapporte également à des articles pourvus de tels revêtements. Ces revêtements présentent une microdureté de Fischer comprise entre 50 et 150 Newtons par mm?2¿ ainsi que de bonnes caractéristiques photochromiques.
Conklin Jeanine A.
Hoch Jessica A.
Swarup Shanti
Welch Cletus N.
Borden Ladner Gervais Llp
Ppg Industries Ohio Inc.
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