Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1992-04-13
1994-02-01
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526265, 526270, 526250, 526254, 526255, 526245, C08F 1220
Patent
active
052833046
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a novel fluorine-containing resin and a coating composition containing it as main component.
More specifically, it relates to a fluorine-containing resin which is soluble in an organic solvent and excellent in compatibility with a curing agent and to a fluorine-based coating composition containing the fluorine-containing resin as a main component, which is cold-curable and capable of giving a coating excellent in gloss, hardness and weatherability.
BACKGROUND OF THE INVENTION
A fluorine-containing resin has been and is widely used in many fields due to its remarkable excellence in heat resistance, mechanical properties, chemical resistance and weatherability. The use of it includes a use as a coating-forming component in a coating composition. For example, there is known a fluorine resin coating composition containing a tetrafluoroethylene polymer or a vinylidene fluoride polymer, which is used in the fields of chemical industry, foods, construction and machinery due to its excellence in lubricity, nontackiness, weatherability and chemical resistance.
The defect with the above fluorine resin coating composition is that it is required to be baked at a high temperature and the range of its use is inevitably limited. In recent years, therefore, it has been attempted to develop a fluorine-based, solvent-type coating composition which contains, as a main component, a fluorine-containing resin soluble in an organic solvent and containing a reactive group curable at room temperature.
Meanwhile, as fluorine-containing resins soluble in an organic solvent, there are known copolymers obtained from fluoroolefins and vinyl monomers copolymerizable therewith, as disclosed in JP-A-61-275311, JP-A-61-57690, JP-A-62-174213, JP-A-63-182312, U.S. Pat. No. 4,960,827, U.S. Pat. No. 4,859,755, U.S. Pat. No. 4,690,968, U.S. Pat. No. 4,436,773, U.S. Pat. No. 4,436,772, U.S. Pat. No. 4,345,057, U.S. Pat. No. 3,218,287, U.S. Pat. No. 3,166,524, U.S. Pat. No. 2,834,767 and EP-A-328,157.
In the above copolymers, however, alkyl vinyl ethers or special vinyl carboxylates are used as a comonomer, and these comonomers, which provide a coating with flexibility, are insufficient with respect to coating hardness, coating gloss, adhesion of a coating to a substrate, pot life, drying properties of a coating, compatibility with a curing agent or a solvent for a fluorine-containing resin, pigment dispersibility and storage stability. Thus, a fluorine-containing resin having well-balanced properties among these properties has not yet been developed.
DISCLOSURE OF THE INVENTION
The present invention has been made for the purpose of overcoming the defects of the above prior art fluorine-containing resin soluble in an organic solvent. It is an object of the present invention to provide a novel fluorine-containing resin excellent in solubility in an organic solvent and compatibility with a curing agent, and a fluorine-based coating composition containing it as a main component, which can give a coating excellent in gloss, hardness and weatherability and further having well-balanced properties among other various properties.
In view of the above points the present inventors have made a diligent study and consequently found that the above object can be achieved by the use of a specific monomer as a fluorine-containing resin. The present invention has been completed on the basis of the above finding.
That is, the present invention relates to a fluorine-containing resin comprising:
Component A: 20 to 95 mol % of a unit of the following general formula, ##STR3## (wherein in each of V, X, Y and Z is, independently of the others, H, F, Cl, an alkyl group having 1 to 6 carbon atoms, or a halo-substituted alkyl group having 1 to 6 carbon atoms, and at least one of these is F),
Component (B): 0 to 80 mol % of a unit of the following general formula, ##STR4## (wherein W is a monovalent organic group having a cyclic hydrocarbon group, R.sup.b1 is a divalent organic group, and each of R.sup.b2 and R.sup.b3
REFERENCES:
patent: 4908410 (1990-03-01), Malhotra
Nakabayashi Akira
Sasahara Hiromasa
Shimizu Atsushi
Ueyanagi Kaoru
Asahi Kasei Kogyo Kabushiki Kaisha
Sarofim N.
Schofer Joseph L.
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