Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
1999-02-19
2002-10-01
Jones, Deborah (Department: 1775)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S423000, C525S425000, C525S430000, C427S421100, C427S428010, C427S429000, C427S435000
Reexamination Certificate
active
06458897
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an aqueous dispersion composition and a process for producing the same, and rust-preventive agent, a rust-preventive treatment method and a rust-preventive treated metal product.
BACKGROUND ART
It is well known that an ionomer resin comprising a macromolecular main chain mainly constituted of a hydrocarbon, which is a partially neutralized product obtained by a part of carboxyl groups present on the side chain wish a metal cation has good adhesion to various substrates, in particular, metals. Further, it is known that since this ionomer resin can easily be dispersed in water, it is used as an aqueous dispersion. For this reason, an aqueous dispersion containing an ionomer resin has conventionally been used as a heat sealing agent for an aluminum foil, a film or a paper, a metal coating agent, a modifier for various emulsions, a paint, an adhesive, a rust-preventive treating agent, and the like.
However, in recent years, various properties are required for a coating formed from an ionomer resin. When the conventional ionomer resin is used as an aqueous dispersion, there is the case that the coating cannot cope with such a diversity.
By the way, in recent years, based on the rise in environmental problems, there is a trend that a chromate treatment (treatment with hexavalent chromate or the like) which has conventionally been applied to a rust-preventive steel plate is omitted. The coating itself formed by this chromate treatment has high degree of corrosion resistance and painting adhesion, and reinforces the function of a rust-preventive layer. Therefore, if this chromate treatment is not conducted, it is presumed that the corrosion resistance and painting adhesion of the rust-preventive steel plate markedly decrease. For this reason, the rust-preventive treating agent used in rust-preventive treated metal plates has come to be required to form a rust-preventive layer having higher degree of corrosion resistance and painting adhesion than the conventional ones. A method of using an ionomer resin has conventionally been known as one of methods of forming a rust-preventive layer without conducting the chromate treatment.
However, the ionomer resin conventionally used for forming a rust-preventive layer was a neutralized product of a monovalent metal such as Na or K, NH
3
, or an amine, and the corrosion resistance was insufficient as a rust-preventive treating agent used for forming a rust-preventive layer on a metal plate to which a chemical conversion treatment such as a phosphate treatment or a chromate treatment is not applied.
Further, an ionomer resin neutralized with a divalent metal such as Mg or Zn has conventionally been known. However, those ionomer resins have a low emulsifying property, and an aqueous dispersion cannot be obtained a good yield. Thus, those have not been used as a treating agent in an aqueous dispersion.
Further, in recent years, with diversity and sophistication on use of rust-preventive treated metal plates, for the purpose of coloration there are increased cases that a coating comprising a curable resin such as a paint is further formed on a rust-preventive treated metal plate which has conventionally been used by merely treating a base material of a substrate metal plate with a rust-preventive treating agent.
However, the ionomer resin has a poor adhesion to a coating comprising a curable resin such as a paint, and the rust-preventive layer comprising this ionomer resin does not show good painting adhesion to a coating comprising an over coat paint even if a paint or the like is coated over the coating of the ionomer resin. Thus, a rust-preventive treated metal product having excellent adhesion between the rust-preventive layer and the coating could not be obtained.
Furthermore, in recent years, high performances are required regarding compatibility, adhesion and the like to a polar compound. However, the conventional ionomer resin having carboxyl group has not met such high requirements.
DISCLOSURE OF THE INVENTION
Accordingly, a first object of the present invention is to provide an aqueous dispersion composition which sufficiently answers high requirement performances, and in particular, is suitable as a heat sealing agent for aluminum foil, film, paper or the like, a metal coating agent, a modifier for various emulsions, a paint, an adhesive, a rust-preventive treating agent, and the like.
Further, a second object of the present invention is to provide a method that can produce the aqueous dispersion composition in high yield.
Further, a third object of the present invention is to provide a rust-preventive treating agent for a metal surface, which contains the above-mentioned aqueous dispersion composition, has excellent corrosion resistance, and can form a rust-preventive layer showing excellent adhesion to an over coat paint when the over coat paint is further coated on an upper layer.
Furthermore, a fourth object of the present invention is to provide a rust-preventive treatment method which forms a rust-preventive layer having excellent corrosion resistance and showing excellent adhesion to an over coat paint when the over coat paint is coated on an upper layer, on the surface of a metal product using the above-mentioned rust-preventive treating agent.
Further, a fifth object of the present invention is to provide a rust-preventive treated metal product having formed thereon a rust-preventive layer having excellent corrosion resistance and showing excellent adhesion to an over coat paint when the over coat paint is coated on an upper layer.
To attain the first object, the present invention is to provide an aqueous dispersion composition comprising an ionomer resin (A) neutralized with a divalent metal, and water.
Further, to attain the second object, the present invention is to provide a process for producing an aqueous dispersion composition including the steps of mixing an ionomer resin (A) neutralized with a divalent metal, and a monovalent alkali metal compound, and emulsifying the same.
Further, to attain the third object, the present invention is to provide a rust-preventive treating agent for a metal surface, comprising the above-mentioned aqueous dispersion composition.
Furthermore, to attain the fourth object, the present invention is to provide a rust-preventive treatment method which comprises coating the above-mentioned aqueous dispersion composition on a metal surface to form a rust-preventive layer.
Further, to attain the fifth object, the present invention is to provide a rust-preventive treated metal product obtained by the above-mentioned rust-preventive treatment method.
BEST MODE FOR CARRYING OUT THE INVENTION
An aqueous dispersion composition and a process for producing the same, and a rust-preventive treating agent, a rust-preventive treatment method and a rust-preventive treated metal product of the present invention are explained in detail below.
The aqueous dispersion composition of the present invention contains an aqueous dispersion comprising an ionomer resin (A), and water. The ionomer resin (A) forming this aqueous dispersion composition is a polymer comprising a polymeric main chain mainly consisting of hydrocarbon, and having carboxyl groups at side chains, wherein at least a part of the carboxyl groups is neutralized with divalent metal cations. A specific example of this ionomer resin can include an ionomer resin (A-1), which is an ethylene-unsaturated carboxylic acid copolymer, comprising a partially neutralized product obtained by neutralizing at least a part of the carboxyl groups contained is neutralized with metal cations.
The ethylene-unsaturated carboxylic acid copolymer that constitutes a main skeleton of this ionomer resin (A-1) may be a random copolymer of ethylene and unsaturated carboxylic acid or a graft copolymer in which unsaturated carboxylic acid is graft bonded to the main chain comprising polyethylene. In particular, the ethylene-unsaturated carboxylic acid random copolymer is preferable in the point that a coating having excellent
Harada Yoshiyuki
Nakazawa Makoto
Otsubo Shigenobu
Tokita Suguru
Birch & Stewart Kolasch & Birch, LLP
Jones Deborah
McNeil Jennifer
Mitsui Chemicals Inc.
LandOfFree
Aqueous dispersion composition process for preparing the... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Aqueous dispersion composition process for preparing the..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Aqueous dispersion composition process for preparing the... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2981009