Stock material or miscellaneous articles – Composite – Of silicon containing
Reexamination Certificate
2001-02-23
2004-03-09
Nutter, Nathan M. (Department: 1711)
Stock material or miscellaneous articles
Composite
Of silicon containing
C428S448000, C428S447000, C428S425500, C524S186000, C524S082000, C524S431000, C524S437000
Reexamination Certificate
active
06703131
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an article coated with a resin film, particularly a coated plastic lens having a titanium oxide-containing resin coat layer, other coated articles and a composition for forming a titanium oxide-containing resin coat layer.
DESCRIPTION OF THE PRIOR ART
Since plastic spectacle lenses have such a defect that they are easily scratched, a silicon-based resin or other hard coat layer has been conventionally formed on the surface of a plastic lens substrate. A primer layer made from a resin such as an urethane-based resin has also been formed between this hard coat layer and the surface of the substrate to improve the adhesion of the hard coat layer and the impact resistance of a plastic lens.
However, when a silicone-based hard coat layer is formed on a high-refractive resin lens having a refractive index of 1.50 or more, an interference fringe is formed by the difference of refractive index between the resin lens and the hard coat layer (or primer layer), thereby worsening the appearance of the lens. To solve this problem, JP-A 7-325201 and JP-A 10-332902 (the term “JP-A” as used herein means an “unexamined published Japanese patent application”) propose the addition of an oxide having a high refractive index such as titanium oxide (TiO
2
). (or a composite oxide containing TiO
2
) to a hard coat or primer to reduce the difference of refractive index between the hard coat layer or primer layer and the substrate so as to prevent an interference fringe.
JP-A 11-131021 discloses a composition for coating comprising the following essential ingredients:
(A) a composite oxide fine particle of tin oxide, titanium oxide and zirconium oxide;
(B) a silane compound having at least one polymerizable reactive group; and
(C) an epoxy (meth)acrylate having a glycidyl group and (meth)acryloyl group in one molecule at the same time.
In the above publication, a silanol or epoxy compound curing catalyst may be added and acetylacetonato containing. Co(II) as the center metal is enumerated as one example of the curing catalyst.
However, the hard coat layer or primer layer containing titanium oxide has such problems as the cracking and peeling off of the layer and a reduction in the hardness of the layer due to insufficient durability.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a coated article which has a highly durable resin coat layer containing titanium oxide and prevents the cracking and peeling off of the layer and a reduction in the hardness of the layer.
It is another object of the present invention to provide a plastic lens which has a highly durable hard coat layer or primer layer and prevents the cracking and peeling off of the layer and a reduction in the hardness of the layer.
It is still another object of the present invention to provide a solution composition for forming a hard coat layer for a plastic lens.
A further object of the present invention is attained by a solution composition for forming a primer layer for a plastic lens.
Other objects and advantages of the present invention will become apparent from the following description.
Firstly, according to the present invention, the above objects and advantages of the present invention are attained by a coated article comprising a substrate and a coat layer made from a resin composition containing titanium oxide and an organic Co(II) compound and formed on the surface of the substrate.
Secondly, according to the present invention, the above objects and advantages of the present invention are attained by a plastic lens which comprises a plastic lens substrate having a refractive index of 1.50 or more and a hard coat layer formed on the surface of the substrate directly or through a primer layer, the hard coat layer comprising:
(1) 2 to 70 wt % of titanium oxide or a composite oxide thereof having a particle diameter of 1.0 to 100 nm;
(2) 0.1 to 10 wt % of an organic Co(II) compound;
(3) 20 to 97.9 wt % of a silicon resin; and
(4) 0.001 to 10 wt % of a curing catalyst,
and having a refractive index of 1.48 or more and a thickness of 0.1 to 5 &mgr;m, the weight percentages of the above components (1), (2) and (3) being based on 100 wt % of the total weight of the components (1), (2) and (3), and the weight percentage of the above component (4) being based on the total weight of the above components (1), (2) and (3).
Thirdly, the above objects and advantages of the present invention are attained by a plastic lens which comprises a plastic lens substrate having a refractive index of 1.50 or more, a primer layer formed on the surface of the substrate, and a hard coat layer comprising a silicone resin as a resin component and formed on the surface of the primer layer, the primer layer comprising:
(1) 2 to 70 wt % of titanium oxide or a composite oxide thereof having a particle diameter of 1.0 to 100 nm;
(2) 0.1 to 10 wt % of an organic Co(II) compound; and
(3) 20 to 97.9 wt % of an urethane resin,
and having a refractive index of 1.48 or more and a thickness of 0.5 to 5 &mgr;m, the weight percentages of the above components (1), (2) and (3) being based on 100 wt % of the total weight of the components (1), (2) and (3).
In the fourth place, according to the present invention, the above objects and advantages of the present invention are attained by a solution composition for forming a hard coat layer which comprises:
(1) 2 to 70 wt % in terms of solid content of a sol containing titanium oxide or a composite oxide thereof having a particle diameter of 1.0 to 100 nm dispersed in water or an organic medium;
(2) 0.1 to 10 wt % of an organic Co(II) compound;
(3) 20 to 97.9 wt % of an epoxy group-containing silicon compound represented by the following formula (1):
R
1
R
2
a
Si(OR
3
)
3−a
(1)
wherein R
1
is a group having an epoxy group and 2 to 12 carbon atoms, R
2
is an alkyl group or halogenoalkyl group having 1 to 6 carbon atoms, alkenyl group having 2 to 6 carbon atoms, phenyl group or halogenophenyl group, R
3
is a hydrogen atom, alkyl group or acyl group having 1 to 4 carbon atoms, and a is 0, 1 or 2,
or a partial hydrolysate thereof; and
(4) 0.001 to 10 wt % of a curing catalyst, the weight percentages of the above components (1), (2) and
(3) being based on 100 wt % of the total weight of the components (1), (2) and (3), and the weight percentage of the above component (4) being based on the total weight of the above components (1), (2) and (3).
In the fifth place, according to the present invention, the above objects and advantages of the present invention are attained by a solution composition for forming a primer layer comprising:
(1) 2 to 70 wt % in terms of solid content of a sol containing titanium oxide or a composite oxide thereof having a particle diameter of 1.0 to 100 nm dispersed in water or an organic medium;
(2) 0.1 to 10 wt % of an organic CO(II) compound;
(3) 10 to 87.9 wt % of a polyol; and
(4) 10 to 87.9 wt % of a polyisocyanate,
the weight percentages of the above components (1), (2), (3) and (4) being based on 100 wt % of the total weight of all the components.
The present invention will be described in detail hereinafter.
A description is first given of the coated article of the present invention.
The coat layer of the coated article is made from a resin composition containing titanium oxide and an organic Co(II) compound.
Co(II) is characterized in that it has an absorption peak at a wavelength of 420 to 550 nm and an organic compound having CO(III) with the main absorption peak at a wavelength of 600 to 800 nm cannot be used in the present invention because it does not have the effect of the organic Co(II) compound of the present invention.
When the titanium oxide-containing resin coat layer contains an organic Co(II) compound and this coat layer is irradiated with ultraviolet rays from sunlight, fluorescent light or other light, ultraviolet rays collide with a titanium oxide particle contained in the coat layer. The titanium oxide particle is excited by ultraviolet rays, thereby forming electrons excited to
Bissett Melanie
Nippon Arc Co., Ltd.
Nutter Nathan M.
LandOfFree
Coated article does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Coated article, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coated article will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3222446