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
2000-05-22
2003-07-22
Harlan, Robert D. (Department: 1713)
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...
C347S100000, C106S493000, C106S494000, C106S499000, C523S160000
Reexamination Certificate
active
06596805
ABSTRACT:
BACKGROUND OF THE INVENTION
A. Technical Field
The present invention relates to: an aqueous fast-drying resin composition which exhibits performance favorable for uses such as gravure ink; and a production process and a use for the aqueous fast-drying resin composition.
B. Background Art
In recent years, from the viewpoint of environmental problems of air pollution and so on, attempts are made to convert conventional solvent type compositions into aqueous compositions in fields of various printing inks, paints, adhesives, and so on. However, it is difficult to except the fast driability from conventional aqueous components. Thus, for example, in the printing field where plastic films are used as substrates mainly for packaging materials, there are problems in respect to driability or wettability upon substrates, therefore the practicization has hardly yet been achieved except some uses.
For the purpose of enhancing the fast driability of aqueous compositions, there might occur methods in which the total solid content in the aqueous compositions is made high to make the amount of water-soluble components, such as surfactants or thickeners, as small as possible, or in which a large amount of low boiling point alcohols, such as methanol, are added to promote drying. However, these methods could not provide sufficiently results with regard to the fast driability. Furthermore, a high value of the total solid content brings about problems of easily damaging the coating and printing workability. On the other hand, the use of a large amount of low boiling point alcohols to achieve the fast driability has problems of air pollution, deterioration of working environment, and necessity to set up solvent treatment apparatuses.
In addition, the conventional aqueous compositions are also inferior with regard to performances, such as adhesion and resistance, when compared with the solvent type compositions. Therefore, for example, in the case where the conventional aqueous compositions are used for gravure ink which is supplied to gravure cylinders having cells formed on their surfaces and is then printed onto substrates, there are problems in that detachment of ink (color migration) occurs according to the substrates, or in that prints become blurred with water and so on.
SUMMARY OF THE INVENTION
A. Object of the Invention
An object of the present invention is to provide an aqueous fast-drying resin composition which is excellent in the fast driability and can exhibit performances with regard to adhesion and resistance on a level with those of solvent type compositions; a production process for the aqueous fast-drying resin composition; and a use of the aqueous fast-drying resin composition as a gravure ink composition.
B. Disclosure of the Invention
The present inventors diligently studied to solve the above problems and, as a result, completed the present invention by finding that: if three components, namely, an anionic resin, an cationic resin, and a polyvalent metallic compound, are allowed to coexist, then excellent fast driability can be exhibited due to the cohesion of the anionic resin and the cationic resin; and a complicated high-molecular matrix is formed due to a stable covalent bond between the anionic resin and the polyvalent metallic compound, and further, the polyvalent metal in this high-molecular matrix forms chelation with an acid functional group of the anionic resin and a basic functional group of the cationic resin to fix them more strongly, with the result that the adhesion and the resistance can be enhanced.
That is to say, an aqueous fast-drying resin composition, according to the present invention, comprises an anionic resin, a cationic resin, and a polyvalent metallic compound.
In addition, another aqueous fast-drying resin composition, according to the present invention, comprises an aqueous medium and a resin component wherein the aqueous medium will be removed by drying, and this aqueous fast-drying resin composition is characterized in that the resin component is combined with a polyvalent metallic compound and includes a combination of an anionic resin and a cationic resin.
A production process for an aqueous fast-drying resin composition, according to the present invention, comprises the step of combining an anionic resin, a cationic resin, and a polyvalent metallic compound.
A gravure ink composition, according to the present invention, comprises an aqueous medium and a resin compound wherein the aqueous medium will be removed by drying, and this gravure ink composition is characterized by comprising an anionic resin, a cationic resin, and a polyvalent metallic compound, and further, a pigment and/or dye.
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
An essential component of the aqueous fast-drying resin composition according to the present invention is a resin component that includes a combination of an anionic resin and a cationic resin.
The anionic resin is not especially limited if it is a resin having an anionic functional group which can exhibit anionic character in that presence of a counter ion, and synthetic or natural resins are usable as the anionic resin. Examples thereof includes resins having a carboxyl group as the anionic functional group, specifically: synthetic resins 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, and carboxyl-group-containing polyester resins; and natural resins such as carboxymethyl cellulose. These may be used either alone respectively or in combinations with each other. In addition, the form of these anionic resins when used is not especially limited, but may be either aqueous solution or water dispersion, that is, emulsion.
The resin having a carboxyl group as the anionic functional group is preferably a polymer resin which is obtained by a process including the step of polymerizing a monomer component including at least one unsaturated carboxylic acid.
The above unsaturated carboxylic acid is not especially limited, but examples thereof include: unsaturated monocarboxylic acids such as (meth)acrylic acid, cinnamic acid, and crotonic acid; and unsaturated dicarboxylic acids, such as maleic acid, itaconic acid, and fumaric acid, and monoesters thereof. These may be used either alone respectively or in combinations with each other. In addition, besides these unsaturated carboxylic acids, unsaturated monomers copolymerizable therewith may further be included in the above 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 &agr;-methylstyrene and styrene. These may be used either alone respectively or in combinations with each other.
The polymerization method to obtain the polymer resin having a carboxyl group as the anionic functional group is not especially limited, and conventional polymerization methods are usable. Examples thereof include solution polymerization, emulsion polymerization, and suspension polymerization. During the polymerization, as the need arises, a part of the resulting polymer resin may be crosslinked with monomers having more than one copol
Miyai Takashi
Morimoto Masakazu
Nigam Asutosh
Renduchintala Ravi S
Saeki Koichiro
Hangen Law Firm PLLP
Harlan Robert D.
Nippon Shokubai Co. , Ltd.
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