Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Patent
1997-11-25
1999-12-28
Gupta, Yogendra
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
510112, 510392, 510393, 134 42, 435264, 514839, C11D 3386, C11D 348
Patent
active
060081708
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Art
The present invention relates to a contact lens cleaning solution and a method of cleaning a contact lens using the solution.
2. Discussion of the Related Art
As conventionally used non-water-absorbable contact lenses, there are known a hard contact lens of polymer made mainly of methyl methacrylate, a high-degree oxygen permeable hard contact lens of polymer made mainly of siloxanyl methacrylate, fluoroalkyl methacrylate, or the like, and a non-water-absorbable soft contact lens made mainly of a silicone rubber that contains polydimethylsiloxane as a major component, or a butyl rubber that contains butyl acrylate as a major component. The surfaces of these non-water-absorbable contact lenses are hydrophobic. In particular, the surfaces of the high-degree oxygen permeable contact lens which has recently attracted public attention exhibit a high degree of hydrophobic property. The hydrophobic property of the lens surfaces causes a problem that lipid deposits which derive from tear fluid and lipid of the eyes adhere to the lens surfaces when the non-water-absorbable contact lenses are worn on the eyes of a user, whereby the contact lens is clouded, leading to deteriorated eyesight of the lens user.
In an attempt to deal with the above-described problem, there are proposed various methods of rendering the hydrophobic surfaces of the contact lens hydrophilic. Examples of the proposed methods include a plasma surface treatment and a chemical treatment using an acid or an alkali. However, the contact lens treated by these methods does not exhibit satisfactory durability in its hydrophilic property at the surfaces thereof, and it is considerably cumbersome to repeat the treatment for rendering the lens surfaces hydrophilic. Thus, the proposed methods are not practical.
Further, there is known a method which uses a so-called wetting solution so as to improve the surfaces of the contact lens. In this method, the contact lens is immersed in a solution that contains a hydrophilic polymer, so that the polymer is fixed to the surfaces of the contact lens. This method permits the contact lens to be repeatedly subjected to the treatment for rendering the lens surfaces hydrophilic, by simply immersing the contact lens in the solution as needed. Thus, the hydrophilic property of the contact lens surfaces is comparatively easily maintained. For instance, JP-B-48-37910 discloses a solution for a contact lens containing polyvinyl alcohol and a water-soluble polymer such as hydroxyethyl cellulose and polyvinyl pyrrolidone.
Such a treatment solution is effective for a contact lens having a comparatively low degree of hydrophobic property, such as a high-degree oxygen permeable contact lens of polymer made mainly of methyl methacrylate. However, the solution is not effective for a contact lens having a high degree of hydrophobic property, such as a non-water-absorbable contact lens which contains a large amount of a silicone or fluorine component, since the water-soluble polymer included in the solution is not likely to adhere to the surfaces of the contact lens. Thus, the solution as described above is not capable of effectively rendering the surfaces of the contact lens hydrophilic.
JP-A-63-246718 discloses a surface treatment solution for a contact lens which consists of a polymeric material with an ionic charge. In effecting the treatment for rendering the surfaces of the contact lens hydrophilic by using the disclosed surface treatment solution, the surfaces of the contact lens need to have an ionic charge opposite to that of the solution. Further, the density of the opposite ionic charge of the lens surfaces needs to be higher than a certain level. For satisfying these requirements, it is necessary to effect a treatment for increasing the density of the ionic charge of the contact lens surfaces, prior to the treatment for rendering the lens surfaces hydrophilic, undesirably making the procedure cumbersome. Like the wetting solution as described above, the disclosed polymeric
REFERENCES:
patent: 3910296 (1975-10-01), Karageozian et al.
patent: 4096870 (1978-06-01), Manfuso, Jr.
patent: 4285738 (1981-08-01), Ogata
patent: 4500441 (1985-02-01), Tanaka et al.
patent: 4710313 (1987-12-01), Miyajima et al.
patent: 4738790 (1988-04-01), Miyajima et al.
patent: 4921630 (1990-05-01), Bhatia
patent: 5314823 (1994-05-01), Nakagawa
patent: 5460658 (1995-10-01), Nakagawa et al.
Narushima Kenji
Niwa Junji
Tanaka Shinji
Tanimoto Emi
Gupta Yogendra
Tomey Technology Corporation
Webb Gregory E.
LandOfFree
Contact lens cleaning solution and method for cleaning contact l does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Contact lens cleaning solution and method for cleaning contact l, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Contact lens cleaning solution and method for cleaning contact l will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2382398