Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2002-07-23
2003-05-20
Sanders, Kriellion A. (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S413000
Reexamination Certificate
active
06566426
ABSTRACT:
BACKGROUND OF THE INVENTION
A. Technical Field
The present invention relates an aqueous resin composition that is excellent in driability, adhesion, and various resistances.
B. Background Art
In recent years, from the viewpoint of environmental problems such as air pollution, in fields of such as various printing inks, coatings, and adhesives, there are considered attempts to convert solvent compositions into aqueous compositions, wherein the solvent compositions have been widely used hitherto. However, the conventional aqueous compositions cannot be expected to have excellent driability. For example, in fields of printing in which plastic films as centrally intended for wrapping are used as base materials, the conventional aqueous compositions have problems in driability and wettability to the base materials, and almost all the conventional aqueous compositions are still impracticable except for some of uses.
As methods to improve the driability of the aqueous compositions, there may be thought of methods in which: the total solid content is increased, and the content of water-soluble components such as surfactants and thickeners is decreased so as to be as low as possible; or the drying is promoted by making the compositions contain a large quantity of low-boiling-point alcohols such as methanol. However, none of these methods could sufficiently satisfy the driability. In addition, in the case where the total solid content is increased, there is caused a problem such that the workability is easily damaged when the coating or soaking, and printing are carried out. On the other hand, in the case where the large quantity of low-boiling-point alcohols are used, there are problems such that: the air pollution is caused; the working environment is lowered; and it is necessary to install apparatuses for treating solvents.
In addition, also as to various resistances, such as water resistance and solvent resistance, and adhesion, the conventional aqueous compositions are inferior to the solvent compositions. Therefore, for example, when the aqueous compositions are used as inks, there is a case where there occur problems such that: the falling-off of the ink (color transferring) is caused; and the print is blotted with water or solvents.
SUMMARY OF THE INVENTION
A. Object of the Invention
Accordingly, an object of the present invention is to provide an aqueous resin composition, which has good driability, and which is excellent in adhesion and various resistances, particularly, water and solvent resistances.
B. Disclosure of the Invention
The present inventors diligently studied to solve the above-mentioned problems. As a result, they have completed the present invention by finding out that: when three components of an anionic resin and/or an amphoteric resin, a polyoxazoline compound, and a multivalent metal compound are allowed to coexist, the excellent driability can be caused by aggregation of the anionic resin and/or amphoteric resin with the polyoxazoline compound; and the adhesion and resistances, particularly, the water and solvent resistances, can be improved, because a complicated polymer matrix is formed by a stable covalent bond that is caused by a combination of the anionic resin or amphoteric resin with the polyoxazoline compound, or by a combination of the anionic resin or amphoteric resin with the multivalent metal compound, and further because the above polymer matrix is more firmly fixed by forming chelation of the multivalent metal in the polymer matrix with an anionic functional group of the anionic resin or amphoteric resin and with an oxazoline ring.
That is to say, an aqueous resin composition, according to the present invention, comprises a combination of: an anionic resin and/or an amphoteric resin; a polyoxazoline compound; and a multivalent metal compound.
These and other objects and the advantages of the present invention will be more fully apparent from the following detailed disclosure.
DETAILED DESCRIPTION OF THE INVENTION
The aqueous resin composition, according to the present invention, comprises the combination including the anionic resin and/or the amphoteric resin as an essential component.
There is no especial limitation of the aforementioned anionic resin if it is a resin having an anionic functional group, and synthetic resins or natural resins can be used. Examples thereof include: synthetic resins that are resins having a carboxyl group as the anionic functional group, such as ethylene-(meth)acrylic acid copolymer resins, vinyl acetate-(meth)acrylic acid copolymer resins, (meth)acrylate ester-(meth)acrylic acid copolymer resins, styrene-(meth)acrylic acid copolymer resins, styrene-butadiene copolymer resins, styrene-maleic anhydride copolymer resins, carboxyl-group-containing urethane resins, carboxyl-group-containing polyester resins, carboxyl-group-containing alkyd resins, and carboxyl-group-containing polyvinyl alcohol resins; and natural resins, such as carboxymethyl cellulose. In addition, carboxyl-group-containing complex resins, such as acrylic-modified polyesters, acrylic-modified polyurethanes, and acrylic-modified epoxy resins, can also be used. These anionic resins may be used either alone respectively or in combinations with each other.
Incidentally, the form of the aforementioned anionic resin may be either water-soluble, or water-dispersible in a form of colloidal dispersion or emulsion. In addition, the anionic resin may comprise a water-soluble anionic resin and a water-dispersible anionic resin together. Particularly, in the present invention, even if only the water-dispersible anionic resin is used, the excellent performance can be displayed because of including the polyoxazoline compound as an essential component.
Preferred examples of the anionic resin having a carboxyl group as the aforementioned anionic functional group include polymer resins as obtained by a process including the step of polymerizing a monomer component containing at least one unsaturated carboxylic acid.
The aforementioned unsaturated carboxylic acid is not especially limited, but examples thereof include: unsaturated monocarboxylic acids, such as (meth)acrylic acid, cinnamic acid, and crotonic acid; unsaturated dicarboxylic acids, such as maleic acid, itaconic acid, and fumaric acid; and their monoesters. These may be used either alone respectively or in combinations with each other. In addition, besides these unsaturated carboxylic acids, an unsaturated monomer copolymerizable with the above unsaturated carboxylic acid can also be used as the aforementioned monomer component. The unsaturated monomer copolymerizable with the unsaturated carboxylic acid is not especially limited, but examples thereof include: (meth)acrylate esters, such as methyl (meth)acrylate, butyl (meth)acrylate, and 2-ethylhexyl (meth)acrylate; unsaturated nitriles such as (meth)acrylonitrile; unsaturated amides, such as (meth)acrylamide and N-methylol(meth)acrylamide; vinyl esters, such as vinyl acetate and vinyl propionate; vinyl ethers, such as methyl vinyl ether and ethyl vinyl ether; &agr;-olefins, such as ethylene and propylene; halogenated &agr;,&bgr;-unsaturated monomers, such as vinyl chloride, vinylidene chloride, and vinyl fluoride; and &agr;,&bgr;-unsaturated aromatic monomers such as styrene and &agr;-methylstyrene. These may be used either alone respectively or in combinations with each other.
The polymerization method for the monomer component containing the aforementioned unsaturated carboxylic acid is not especially limited, but conventional polymerization methods can be applied thereto. For example, the polymerization method may be carried out by such as a solution polymerization method, emulsion polymerization method or suspension polymerization method. Specifically, the water-soluble anionic resin can be obtained by such as the solution polymerization method, and water-dispersible anionic resin can be obtained by such as the emulsion polymerization method or suspension polymerization method. In addition, the monomer component, for example, may be added to a rea
Kanaida Kenta
Miyai Takashi
Mizushima Makoto
Saeki Koichiro
Nippon Shokubai Co. , Ltd.
Roylance Abrams Berdo & Goodman L.L.P.
Sanders Kriellion A.
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