Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1996-10-24
1997-12-16
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524457, 526279, C08L 4304
Patent
active
056986289
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a resin composition suitable as a water-based paint which has good film performances, for example, in interior and exterior coating of buildings and coating of various articles such as automobiles, household electric appliances, plastic goods and others, particularly in uses requiring weatherability and durability.
BACKGROUND ART
In the fields of paints and adhesives, conversion of organic solvent-based systems to non-solvent systems using water-soluble or water-dispersible resins or powder resins has been attempted from the viewpoints of anti-pollution measure or resource saving. In the field of paints, the conversion to water-based paints has been earnestly made rather than powder coating. However, conventional aqueous resins have the disadvantage that since they have no crosslinkable functional group in the molecules, they are subject to a strong influence of surface active agents used in the polymerization to remarkably deteriorate the weatherability, water resistance and stain resistance of the formed coating films and, therefore, are inferior in film performances as compared with solvent-based paints.
Various proposals have been made in order to improve the above disadvantage. For example, it is proposed to apply an emulsion of a polymer having a hydrolyzable silyl group as a crosslinkable functional group to water-based paints (cf. Japanese Patent Publication Kokai No. 3-227312). There is proposed an aqueous emulsion paint which can form crosslinkages between polymer particles by a reaction of carboxyl group and hydrazyl group (cf. Japanese Patent Publication Kokai No. 5-59305). There is also proposed a water-dispersion type fluororesin paint wherein a fluororesin which exhibits high performances in solvent systems, is made water-dispersible (cf. Japanese Patent Publication Kokai No. 5-25421).
In these paints, some degree of improvement is achieved with respect to weatherability and water resistance. However, adoption of aqueous system raises new problems, and the proposed paints are still unsatisfactory.
Also, known water-based paints are considerably inferior in stain resistance as compared with solvent-based paints. Recently, the stain resistance is increasingly demanded in various fields and, therefore, the stain resistance on a level close to that of solvent-based paints of low staining type is demanded for water-based paints, too.
As a result of making an intensive study in order to solve these problems, the present inventors have found at last that coating films having an excellent stain resistance which has not been able to be achieved by conventional water-based paints, as well as excellent weatherability and water resistance can be formed by mixing various kinds of water-based paint compositions or aqueous resin compositions with a tetra(tri)alkoxysilane and/or its partial hydrolysis condensate, and/or a silicon compound having at least one amino group and/or its derivative and at least one hydrolyzable silyl group in a molecule, in a specific ratio, and also mixing the compositions with a curing catalyst in a specific ratio. Thus, the present inventors have accomplished the present invention.
DISCLOSURE OF THE INVENTION
That is to say, the present invention relates to a resin composition suitable as water-based paints, which comprises:
(A) 100 parts by weight of an emulsion of a polymer obtained by copolymerizing a vinyl monomer containing a silyl group of the formula (I): ##STR1## wherein R.sup.1 is the same or different and each is an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms or an aralkyl group having 7 to 10 carbon atoms, X.sup.1 is at least one group selected from the group consisting of a halogen atom, an alkoxyl group, a hydroxyl group, an acyloxy group, an aminooxy group, a phenoxy group, a thioalkoxy group and an amino group, and a is an integer of 0 to 2, with other vinyl monomer,
1 to 70 parts by weight of (B) a silicon compound of the formula (II): 1 to 10 carbon atoms, an aryl gro
REFERENCES:
patent: 5100955 (1992-03-01), Pons et al.
patent: 5322890 (1994-06-01), Ando et al.
Ando Naotami
Kusumi Akira
Masuda Toshiyuki
Kanegafuchi Kagaku Kogyo & Kabushiki Kaisha
Marquis Melvyn I.
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