Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Reexamination Certificate
2001-01-31
2003-01-21
Dawson, Robert (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
C528S025000, C525S100000, C525S523000
Reexamination Certificate
active
06509432
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an ordinary temperature curable coating composition in which an oxidative curable silicon modified vinyl-based resin is used, and a coating film superior in weathering resistance, initial drying property, and further alkali resistance can be formed.
BACKGROUND OF THE INVENTION
As a conventional coating resin which has ordinary temperature curable property, and is stable in a solution state over a long period, an alkyd resin using an unsaturated fatty acid has been well known, and is generally used in building interior/exterior coatings, but the alkyd resin easily causes weathering deterioration by ultraviolet radiation, and performance is insufficient for use in outdoor purposes. As a technique of solving this weathering resistance problem, for example, an acrylic resin modified by a fatty acid is proposed in British Patent No. 793,776. The fatty acid modified acrylic resin is slightly improved in the weathering resistance. However, since the fatty acid is contained as a low-polarity soft component, coating performances such as weathering resistance, water resistance, acid resistance, and alkali resistance cannot be said to be sufficient.
SUMMARY OF THE INVENTION
The purpose of this invention is to provide an ordinary temperature curable coating composition having excellent properties in weathering resistance, water resistance, acid resistance or alkali resistance. The present invention pertains to an ordinary temperature curable coating composition. In particular, the coating composition comprises, as a resin component, an oxidative curable silicon modified vinyl-based resin (A) which is obtainable by combining an epoxy group-containing vinyl copolymer (a) which is a copolymer of an epoxy group-containing polymerizable unsaturated monomer and another polymerizable unsaturated monomer copolymerizable with the epoxy group-containing polymerizable unsaturated monomer with an unsaturated fatty acid-containing fatty acid component (b) and a silicon resin containing a hydroxyl group and/or an alkoxyl group (c) which is directly bonded to a silicon atom. In the epoxy group-containing vinyl copolymer (a), a copolymerization ratio of the epoxy group-containing polymerizable unsaturated monomer to the other polymerizable unsaturated monomer copolymerizable with the above monomer may be such that the epoxy group-containing polymerizable unsaturated monomer is preferably in a range of 3 to 70 wt % and the other polymerizable unsaturated monomer is preferably in a range of 30 to 97 wt %. The epoxy group-containing vinyl copolymer (a) may be a copolymer whose number-average molecular weight is preferably in a range of 1,000 to 100,000 and whose glass transition temperature is in a range of 0° C. to 100° C. The unsaturated fatty acid-containing fatty acid component (b) may preferably have an iodine number of 50 to 200.
PREFERABLE EMBODIMENTS OF THE INVENTION
In the present invention, an oxidative curable silicon modified vinyl-based resin (A) is a resin which is obtainable by combining an epoxy group-containing vinyl copolymer (a) with an unsaturated fatty acid-containing fatty acid component (b) and a silicon resin (c) containing a hydroxyl group and/or an alkoxyl group which is directly bonded to a silicon atom.
Examples of an epoxy group-containing polymerizable unsaturated monomer which is a copolymerization component of the epoxy group-containing vinyl copolymer (a) include glycidyl (meth)acrylate, &bgr;-methylglycidyl (meth)acrylate, 3,4-epoxycyclohexyl methyl (meth)acrylate, 3,4-epoxycyclohexyl propyl (meth)acrylate, and aryl glycidyl ether.
Examples of another polymerizable unsaturated monomers each of which can be copolymerized with the epoxy group-containing polymerizable unsaturated monomer include: alkyl esters, having 1 to 24 carbon atoms, of acrylic acids or methacrylic acids such as methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, hexyl (meth)acrylate, 2-ethyl hexyl (meth)acrylate, n-octyl (meth)acrylate, decyl (meth)acrylate, lauryl (meth)acrylate, stearyl (meth)acrylate, and cyclohexyl (meth)acrylate; and hydroxyl group-containing monomers such as hydroxyalkyl esters of &agr;,&bgr;-ethylenic unsaturated carboxylates which include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-hydroxybutyl (meth)acrylate and 4-hydroxybutyl (meth)acrylate, and &agr;,&bgr;-ethylenic unsaturated carboxylate esters having alkylene oxide chains and hydroxyl group which include polyethylene glycol mono(meth)acrylate and polypropylene glycol mono(meth)acrylate. Further, the polymerizable unsaturated monomers that can be copolymerized with the epoxy group-containing polymerizable unsaturated monomer may include isobornyl (meth)acrylate; 1,2,2,6,6,-pentamethyl piperidyl (meth)acrylate; 2,2,6,6-tetramethyl piperidinyl (meth)acrylate; 2-(2′-hydoxy-5′-methacryloxyphenyl)-2H-benzotriazole; styrene; and the like.
In the epoxy group-containing vinyl copolymer (a), a copolymerization ratio of the epoxy group-containing polymerizable unsaturated monomer to the other polymerizable unsaturated monomer is usually such that the epoxy group-containing polymerizable unsaturated monomer is preferably in a range of 3 to 70 wt %, more preferably 5 to 40 wt %, and the other polymerizable unsaturated monomer is preferably in a range of 30 to 97 wt %, more preferably 60 to 95 wt %. This is appropriate with respect to addition reaction property during reaction with the unsaturated fatty acid (b), solubility of the resulting epoxy group-containing vinyl copolymer (a) in a solvent, and the like.
In the epoxy group-containing vinyl copolymer (a), for determination of a usage of a hydroxyl group-containing monomer, the usage should be determined in such a manner that gelation by reaction with a glycidyl group in the vinyl copolymer (a), or gelation during reaction with a silicon resin fails to occur. Usually, it is appropriate and preferable that the usage of the hydroxyl group-containing monomer is 50 parts by weight or less with respect to 100 parts by weight of total monomer components constituting the vinyl copolymer (a).
A copolymerization method for obtaining the epoxy group-containing vinyl copolymer (a) is not particularly limited, but in consideration of ease of reaction with the fatty acid component (b) and a silicon resin (c), a solution polymerization method is preferable which is performed in an organic solvent under existence of a radical polymerization initiator.
Examples of the radical polymerization initiator for use in synthesis by solution polymerization of the epoxy group-containing vinyl copolymer (a) include: azo-based polymerization initiators such as 2,2′-azobisisobutyronitrile and 2,2′-azobis(2,4-dimethylvaleronitrile); and peroxide-based polymerization initiators such as lauryl peroxide, t-butylperoxy-2-ethylhexanoate and benzoyl peroxide. Moreover, examples of the organic solvent for use in synthesis by solution polymerization include: aliphatic hydrocarbon-based solvents such as n-hexane, n-octane, 2,2,2-trimethyl pentane, isooctane, n-nonane, cyclohexane, and methylcyclo hexane; aromatic hydrocabon-based solvents such as benzene, toluene, xylene and ethyl benzene; petroleum-based solvents such as mineral spirit, “SWASOL 1000” (product of Cosmo Oil Co., Ltd.), petroleum ether, petroleum benzine, and petroleum naphtha; ketone-based solvents such as methyl isobutyl ketone; ester-based solvents such as isobutyl acetate; and alcohol-based solvents such as isopropanol. These solvents can arbitrarily be used alone, or as a mixture of two or more thereof, if necessary.
For the epoxy group-containing vinyl copolymer (a), a number-average molecular weight is preferably in a range of 1,000 to 100,000, more preferably 2,000 to 50,000, and a glass transition temperature (Tg) is preferably in a range of 0° C. to 100° C. This is preferable in view of coating film physical properties a
Hamamura Toshihiro
Kasei Kazuhiko
Kawamura Chikara
Nakao Tadahiro
Kansai Paint Co. Ltd.
Rader & Fishman & Grauer, PLLC
Zimmer Marc S.
LandOfFree
Ordinary temperature curable coating composition does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Ordinary temperature curable coating composition, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ordinary temperature curable coating composition will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3055725