Compositions – Light transmission modifying compositions – Displaying color change
Patent
1995-10-13
1997-11-04
Tucker, Philip
Compositions
Light transmission modifying compositions
Displaying color change
G02B 523
Patent
active
056836287
ABSTRACT:
A photochromic composition comprising (a) 100 parts by weight of a di(meth)acrylate compound represented by the formula (I): ##STR1## wherein R.sup.1 s each independently represent hydrogen or methyl, R.sup.2 s and R.sup.3 s each independently represent alkylene having 1 to 4 carbon atoms, X represents halogen other than fluorine, Y represents oxygen or sulfur, and m is an integer of 0 to 4, and (b) 0.01 to 5 parts by weight of a photochromic compound. The photochromic composition is excellent in heat resistance, mechanical strength, adhesion to a hard coat layer and moldability, and the photochromic properties thereof is highly resistant to light. By the use of the photochromic composition, a thin and light-weight photochromic lens or the like can be obtained.
REFERENCES:
patent: 5247041 (1993-09-01), Iguchi
patent: 5330686 (1994-07-01), Smith et al.
patent: 5462698 (1995-10-01), Kobayakawa et al.
patent: 5520853 (1996-05-01), Rickwood et al.
Database WPI, Section CH, Week 8418 Derwent Publication Ltd. London, G.B. Class A89, AN 84-110057, 1984.
Kobayakawa Takashi
Kubota Satoshi
Miyabayashi Toshiyuki
Mizuno Hitoshi
Saito Tooru
Seiko Epson Corp.
Tokuyama Corp.
Tucker Philip
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