Coating processes – With post-treatment of coating or coating material – Heating or drying
Reexamination Certificate
1999-01-26
2001-04-10
Dawson, Robert (Department: 1712)
Coating processes
With post-treatment of coating or coating material
Heating or drying
C528S039000, C528S030000, C528S032000, C524S432000, C524S431000, C524S091000, C524S081000, C556S027000, C556S051000, C556S081000, C560S126000
Reexamination Certificate
active
06214416
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a coating composition and, more particularly, to an organosilane-based coating composition comprising a semiconductor component which possesses ultraviolet ray absorbing capability.
2. Description of the Background Art
Organosilane-based coating materials not only have excellent weather resistance, light resistance, and stain resistance, but also exhibit superior heat resistance, alkali resistance, solvent resistance, humidity resistance, water resistance, insulation resistance, abrasion resistance, soil resistance, good hardness, and mar resistance.
Demand for coating materials exhibiting long-term durability, particularly those used for protection of substrates and bases, has increased in recent years. The above-mentioned organosilane-based coating materials have excellent weather resistance. These coating materials are stable due to their incapability of absorbing ultraviolet rays. However, because these coating materials transmit ultraviolet rays, the substrates and bases on which these coating materials are coated deteriorate easily. The coating may delaminate or produce cracks. UV absorbers have conventionally been used to overcome this problem. However, UV absorbers have problems such as coloration of the coating materials, lack of affinity with resins, inadequate film-forming capability, lack of transparency, and the like. In addition, if added in a large amount, the UV absorbers may bleed out on the surface of the coating film, thereby impairing the film properties.
The present invention has been completed in view of these problems in the conventional technologies. Accordingly, an object of the present invention is to provide a coating composition which exhibits excellent storage stability and produces coating films with good appearance, superior adhesion properties, weather resistance, high hardness, and superb UV absorbing capability, and is therefore capable of preventing deterioration of substrates and bases.
The present inventors have conducted extensive studies and found that a coating composition with desired characteristics can be obtained by using a specific organosilane component and a semiconductor component which possesses UV ray absorbing capability.
SUMMARY OF THE INVENTION
Specifically, the present invention provides compositions for coatings defined in (1)-(9) below and their cured products.
(1) A coating composition (hereinafter called from time to time “first composition”) which comprises:
(A) a hydrolyzate or partial condensate, or both, of an organosilane compound represented by the following formula (1),
(R
1
)
n
Si (OR
2
)
4−n
(1)
wherein R
1
is a hydrogen atom or a monovalent organic group having 1-8 carbon atoms, R
2
is an alkyl group having 1-5 carbon atoms or an acyl group having 1-6 carbon atoms, and n is an integer from 0 to 2,
(B) at least one ultraviolet ray absorbing component selected from the group consisting of fine semiconductor particles, semiconductor sols, and organic compounds having ultraviolet ray absorbing capability, and
(C1) water and/or an organic solvent.
(2) A coating composition further comprising, in addition to the components (A), (B), and (C1), (D) at least one curing accelerator selected from the group consisting of acid compounds, alkaline compounds, salt compounds, amine compounds, organometallic compounds, and partial hydrolyzates of the organometallic compounds.
(3) A coating composition according to (2) above, wherein the component (D) is an organometallic compound of the following formula (2),
M(OR
10
)
p
(R
11
COCHCOR
12
)
q
(2)
wherein M is zirconium, titanium, or aluminum, R
10
and R
11
individually represent a monovalent hydrocarbon group having 1-6 carbon atoms, such as an ethyl group, n-propyl group, i-propyl group, n-butyl group, sec-butyl group, t-butyl group, n-pentyl group, n-hexyl group, cyclohexyl group, or phenyl group, R
12
represents, in addition to the monovalent hydrocarbon groups having 1-6 carbon atoms defined for R
10
and R
11
, an alkoxyl group having 1-16 carbon atoms such as a methoxy group, ethoxy group, n-propoxy group, i-propoxy group, n-butoxy group, sec-butoxy group, t-butoxy group, lauryloxy group, or stearyloxy group, and p and q are individually integers from 0 to 4, with (p+q) being a valence of M, and further comprising,
(E) at least one compound selected from the group consisting of &bgr;-diketone compounds of the following formula (3),
R
13
COCH
2
COR
14
(3)
wherein R
13
and R
14
are the same as R
11
and R
12
defined for the above formula (2),
&bgr;-keto esters, carboxylic acid compounds, dihydroxy compounds, amine compounds, and oxyaldehyde compounds.
(4) A coating composition (hereinafter called from time to time “second composition”) which comprises:
(A) a hydrolyzate or partial condensate, or both, of an organosilane compound represented by the following formula (1),
(R
1
)
n
Si(OR
2
)
4−n
(1)
wherein R
1
is a hydrogen atom or a monovalent organic group having 1-8 carbon atoms, R
2
is an alkyl group having 1-5 carbon atoms or an acyl group having 1-6 carbon atoms, and n is an integer from 0 to 2,
(B) at least one ultraviolet ray absorbing component selected from the group consisting of semiconductor fine particles, semiconductor sols, and organic compounds having ultraviolet ray absorbing capabilities, and
(C2) a polymer having a silyl group of which the silicon atom is bonded with a hydrolyzable group and/or a hydroxyl group on the terminal and/or side chain of the polymer molecule.
(5) A coating composition further comprising, in addition to the components (A), (B), and (C2), (D) at least one curing accelerator selected from the group consisting of acid compounds, alkaline compounds, salt compounds, amine compounds, and organometallic compounds, and partial hydrolyzates of the organometallic compounds.
(6) A coating composition according to (5) above, wherein the component (D) is an organometallic compound of the following formula (2),
M(OR
10
)
p
(R
11
COCHCOR
12
)
q
(2)
wherein M is zirconium, titanium, or aluminum, R
10
and R
11
individually represent a monovalent hydrocarbon group having 1-6 carbon atoms, such as ethyl group, n-propyl group, i-propyl group, n-butyl group, sec-butyl group, t-butyl group, n-pentyl group, n-hexyl group, cyclohexyl group, or phenyl group, R
12
represents, in addition to the monovalent hydrocarbon groups having 1-6 carbon atoms defined for R
10
and R
11
, an alkoxyl group having 1-16 carbon atoms such as methoxy group, ethoxy group, n-propoxy group, i-propoxy group, n-butoxy group, sec-butoxy group, t-butoxy group, lauryloxy group, or stearyloxy group, and p and q are individually an integer of 0-4, with (p+q) being the valence of M, and further comprising,
(E) at least one compound selected from the group consisting of &bgr;-diketone compounds of the following formula (3),
R
13
COCH
2
COR
14
(3)
wherein R
13
and R14 are the same as R
11
and R
12
defined for the above formula (2),
&bgr;-keto esters, carboxylic acid compounds, dihydroxy compounds, amine compounds, and oxyaldehyde compounds.
(7) A coating composition according to (4) above, wherein the ultraviolet ray absorbing component (B) forms a condensate with the polymer of the component (C2).
(8) A cured product produced by applying the coating composition of (1) or (4) above onto a substrate and drying the coating.
(9) A cured product produced by applying a primer on a substrate, applying the coating composition of (1) or (4) above on the primer, and drying the coating.
Other objects, features and advantages of the invention will hereinafter become more readily apparent from the following description.
DETAILED DESCRIPTION OF THE INVENTION AND PREFERRED EMBODIMENTS
The components for the composition of the present invention will be described in detail.
Component (A)
The component (A) in the composition of the present invention is a hydrolyzate and/or partial condensate of the organosilan
Sakagami Toshinori
Shimada Mibuko
Dawson Robert
JSR Corporation
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Peng Kuo-Liang
LandOfFree
Coating composition having at least one UV ray absorbing... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Coating composition having at least one UV ray absorbing..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coating composition having at least one UV ray absorbing... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2550299