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...
Reexamination Certificate
2000-01-04
2002-06-25
Michl, Paul R. (Department: 1714)
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...
C524S506000
Reexamination Certificate
active
06410626
ABSTRACT:
TECHNICAL FIELD
The present invention relates to an aqueous dispersion composition which, when applied to the surface of a porous civil engineering or building material, maintains its waterproofing and decorative effects for a long period of time and also has an excellent antifungal activity, and to an article coated therewith.
BACKGROUND ART
Porous civil engineering and building materials are widely used in various fields, inclusive of construction and building materials. As such porous civil engineering and building materials, there maybe mentioned, among others, porous inorganic construction and building materials such as architectural concrete, lightweight concrete, precast concrete, autoclaved lightweight concrete (ALC), asbestos slates, mortar, calcium silicate boards, pulp cement boards, cemented excelsior boards, gypsum boards, hard boards, plaster, bricks, blocks, tiles, gypsum plaster, dolomite plaster, natural stones, artificial stones, and glass wool; and porous organic construction and building materials such as lumbers or timbers, plywoods, and particle boards.
Unless subjected to strict waterproofing treatment, these porous construction and building materials may allow moisture to penetrate into the inside thereof until a long time has passed, whereby cracking may be caused due to expansion, for instance, and when structural steels exist therein, the moisture may induce rusting of the structural steels and cause cracking due to expansion. Furthermore, if the waterproofing treatment is insufficient, the surface may assume the so-called wet color, whereby the decorative feature is impaired.
Organosilicon compounds and the like have so far been used as waterproofing agents preventing absorption of water to porous construction and building materials by coating or absorbing the surface thereof. However, they have a drawback in that they cannot fully express their waterproofing property when they are used under conditions where water will stay on the material surface for long.
In Japanese Kokai Publication Hei-03-232527, there is disclosed a technology which comprises making up an alkylalkoxysilane into an aqueous composition without using any solvent and using the same as a penetrable water-absorption inhibitor for concrete. According to this technology, alkylalkoxysilanes known to have waterproofing effects are made up into aqueous compositions using specific emulsifiers to thereby control environmental pollution by organic solvents and acquire penetrating properties and good waterproofing effects. However, the effects are not maintained long.
Studies have been done in respect of decorative qualities of porous construction and building materials as well. Japanese Kokai Publication Hei-05-124880 discloses a method of finishing such materials by applying thereto an undercoat composition mainly comprising an aqueous silicone compound and a top coat composition comprising a pigment-containing or pigment-free fluororesin paint in that order. According to this technology, a decorative feature, for example an architectural concrete-like feature, can be provided in addition to the prolonged waterproofing effect mentioned above.
This technology, however, requires two substrate coating procedures, hence much time and labor are required in field operations and, furthermore, problems still remain from the viewpoint of reproducibility and quality maintenance.
SUMMARY OF INVENTION
In view of the above state of the art, it is an object of the present invention to provide an aqueous dispersion composition for the application to porous construction and building materials, which is of the aqueous one-component type, hence simple and easy to apply, and at the same time has both decorative and sufficient waterproofing properties, as well as a coated article obtained by using the same.
The aqueous dispersion composition of the present invention comprises (1) a repellent, (2) an organosilicon compound of the general formula (I)
(wherein R
1n
represents a saturated alkyl group containing 1 to 18 carbon atoms and, when nn is 2 or more, the R
1n
groups may be the same or different; R
2n
represents a saturated alkyl group containing 1 to 5 carbon atoms and, when nn is 2 or more, the R
2n
groups may be the same or different; and nn represents an integer of 1 to 9), and (3) a fluorine-containing resin.
DETAILED DESCRIPTION OF THE INVENTION
In the following, the present invention is described in detail.
The aqueous dispersion composition of the present invention comprises (1) a repellent, (2) an organosilicon compound and (3) a fluorine-containing resin.
First, the repellent (1) is described.
The repellent (1) to be used according to the present invention comprises at least one member selected from among perfluoroalkyl group-containing compounds, fluorinated surfactants, fluorinated oils, fluorosilicone oils and silicone oils. Among them, perfluoroalkyl-containing compounds are preferred. These repellents are described below.
(I) Perfluoroalkyl-containing Compounds
Mention may be made of homopolymers of a perfluoroalkyl-containing, ethylenically unsaturated monomer, and copolymers of such monomer and some other monomer.
As said perfluoroalkyl-containing ethylenically unsaturated monomer, there may be mentioned, for example, the following compounds:
Rf(CH
2
)
n
OCOCR
3
═CH
2
Rf(CH
2
)
m
COOCH═CH
2
RF(CH═CH(CH
2
)
n
OCOCR
3
═CH
2
In the above formulas, Rf represents a perfluoroalkyl group the alkyl moiety of which contains 4 to 20 carbon atoms; R
1
represents hydrogen or an alkyl group containing 1 to 10 carbon atoms; R
2
represents an alkylene group containing 1 to 10 carbon atoms; R
3
represents a hydrogen atom or a methyl group; R
4
represents an alkyl group containing 1 to 17 carbon atoms; n represents an integer of 1 to 10; and m represents an integer of 0 to 10.
As said other monomer, which is copolymerizable with the above-mentioned perfluoroalkyl-containing, ethylenically unsaturated monomer, there may be mentioned, among others, alkyl (meth) acrylates in which the alkyl moiety contains 1 to 20 carbon atoms, cyclohexyl (meth)acrylate, benzyl (meth)acrylate, polyethylene glycol di(meth)acrylate, N-methylolacrylamide, ethylene, vinyl chloride, vinyl fluoride, (meth)acrylamide, styrene, &agr;-methylstyrene, p-methylstyrene, vinyl alkyl ethers in which the alkyl moiety contains 1 to 20 carbon atoms, haloalkyl vinyl ethers in which the alkyl moiety contains 1 to 20 carbon atoms, vinyl alkyl ketones in which the alkyl moiety contains 1 to 20 carbon atoms, maleic anhydride, butadiene, isoprene, chloroprene; and silyl-containing vinyl monomers, such as vinyltriethoxysilane, vinyltrimethoxysilane and &ggr;-(methacryloxypropyl) trimethoxysilane.
Solutions or dispersions of such a copolymer in an organic solvent or an aqueous medium are commercially available. As such, there may be mentioned, for example, Unidyne TG-652 (product of Daikin Industries), Unidyne TG-664 (product of Daikin Industries), Unidyne TG-410 (product of Daikin Industries) and the like.
In addition to the perfluoroalkyl-containing polymer (I) mentioned above, other perfluoroalkyl-containing compounds may also be used as the repellent in the present invention. As said other perfluoroalkyl-containing compounds, there may be mentioned reaction products from a compound represented by the following general formula
(wherein Rf, R
1
, R
2
, R
4
and n are as defined above), and an isocyanate compound. Said isocyanate compound includes aliphatic, alicyclic or aromatic monoisocyanato group-containing compounds; polyisocyanate compounds such as hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, hexamethylene triisocyanate, lysine ester triisocyanates, isophoronediisocyanate, hydrogenated xylylene diisocyanate, toluenediisocyanate, xylylene diisocyanate, diphenylmethanediisocyanate, etc.; modifications of these, such as trisbiuret modifications, isocyanurate modifications and triol modifications, and so forth.
As the perfluoroalkyl-containing compounds usable as the repellent in the present i
Honda Kayoko
Imoto Katsuhiko
Wada Susumu
Connolly Bove & Lodge & Hutz LLP
Daikin Industries Ltd.
Michl Paul R.
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