Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2000-02-29
2001-12-11
Medley, Margaret (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C523S107000, C526S259000, C548S259000, C548S260000, C351S159000
Reexamination Certificate
active
06329445
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an ocular lens material. More particularly, the present invention relates to an ocular lens material which has excellent ultraviolet-ray absorbing power and excellent oxidation inhibiting power at the same time, and can be suitably used for a contact lens, an intraocular lens and an artificial cornea.
Conventionally, from the viewpoint of excellent ultraviolet-ray absorbing power, various benzotriazole ultraviolet-ray absorbing agents have been used for medical materials. Among the medical materials, in particular, an ocular lens needs not only ultraviolet-ray absorbing power but also oxidation inhibiting power at many times because there is a fear that color and mark of the ocular lens are decolorized during chemical disinfection by using hydrogen peroxide. However, because most of these benzotriazole ultraviolet-ray absorbing agents have only ultraviolet-ray absorbing power, these agents cannot satisfy the above needs alone.
From the viewpoint of oxidation inhibiting power, a medical material containing an oxidation inhibitor such as a hindered amine derivative has been disclosed in Japanese Examined Patent Publication No. 69489/1994. However, the oxidation inhibitor has no excellent ultraviolet-ray absorbing power. In addition, in consideration of prevention for decolorizing of color and mark of the ocular lens, oxidation inhibiting power of this oxidation inhibitor is insufficient.
As mentioned above, conventionally, considerably useful ocular lens materials made from a compound which has not only excellent ultraviolet-ray absorbing power but also excellent oxidation inhibiting power have not been provided. Accordingly, development of such materials as above has been expected.
An object of the present invention is to provide an ocular lens material which has excellent ultraviolet-ray absorbing power and excellent oxidation inhibiting power at the same time.
This and other objects of the present invention will become apparent from the description hereinafter.
SUMMARY OF THE INVENTION
In accordance with the present invention, there is provided an ocular lens material comprising a polymer prepared by polymerizing a component for polymerization containing a benzotriazole compound (A) represented by the formula (I):
wherein X is hydrogen atom, a halogen atom, an alkyl group having 1 to 3 carbon atoms or an alkoxy group having 1 to 3 carbon atoms, R
1
is a linear or branched alkylene group having 2 to 10 carbon atoms, R
2
is hydrogen atom, methyl group or a halogenated methyl group, R
3
is hydrogen atom, an alkyl group or an aryl group, and each of R
4
and R
5
is independently an alkyl group having 1 to 8 carbon atoms.
The ocular lens material of the present invention shows no toxicity owing to elution of a component for polymerization and is, of course, excellent in safety. In addition, the ocular lens material has excellent ultraviolet-ray absorbing power and excellent oxidation inhibiting power at the same time. Accordingly, the ocular lens material can be suitably used for a contact lens, an intraocular lens and an artificial cornea.
REFERENCES:
patent: 5147902 (1992-09-01), Ichikawa et al.
patent: 5814680 (1998-09-01), Imafuku
patent: 5945465 (1999-08-01), Ozark et al.
patent: 6036891 (2000-03-01), Liao et al.
patent: 6096846 (2000-08-01), Oda et al.
patent: 0 488 145 A (1992-06-01), None
patent: 0 847 997 A (1998-06-01), None
patent: 0 899 590 A (1999-03-01), None
patent: 2000-119260 (2000-04-01), None
Nakada Kazuhiko
Okumura Akiko
Okumura Akinori
Armstrong Westerman Hattori McLeland & Naughton LLP
Medley Margaret
Menicon Co. Ltd
Toomer Cephia D.
LandOfFree
Ocular lens material does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Ocular lens material, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ocular lens material will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2593691