Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2000-12-19
2003-09-23
Harlan, Robert (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S310000, C526S319000, C526S342000, C526S346000, C525S063000, C525S070000
Reexamination Certificate
active
06624272
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention concerns hollow crosslinked cationic polymer particles, which are favorable for use as a filler for filled paper, pigments for coating paper, an additive for and paints, or a filler for resins and rubber, and the like, and a method of producing such hollow crosslinked cationic polymer particles.
The another present invention also concerns a paint composition, which contains hollow crosslinked cationic polymer particles and a film-forming cationic polymer, is excellent in preservation stability, and can form a lightweight coat with high hiding properties.
The another present invention also concerns a paint composition, which contains hollow crosslinked cationic polymer particles and a film-forming cationic polymer, is excellent in preservation stability, and can form a lightweight coat with high hiding properties.
The another present invention also concerns a cationic electrodeposition paint composition, which contains hollow crosslinked cationic polymer particles and a film-forming cationic resin, exhibits excellent stability as an electrodeposition paint, and can form a lightweight coat with high hiding properties.
The another present invention also concerns a resin composition in which hollow crosslinked cationic polymer particles, having specific physical properties, are blended in a resin.
The another present invention also concerns filled paper, which is filled with hollow crosslinked cationic polymer particles, as well as a paper coating composition and coated paper, which contain hollow crosslinked polymer particles as the pigment and a binder component.
2. Prior Arts
Due to their characteristics of being lightweight, high in whiteness, good in dispersion properties, and the like, hollow polymer particles are used as fillers for filled paper, pigments for paper coating, additives for paints, and fillers for resins, rubbers, and the like. Hollow polymer particles that are cationic are especially anticipated for applications to paper coating pigments and fillers for resin due to the expression stability when added to a cationic paint.
Priorly with regard to cationic hollow polymer particles, the use of hollow ampholytic polymer particles at a specific pH has been proposed for example in Japanese laid-open Patent Publication No. 27963 of 1998, and particles, with which a soft polymer with amino groups are swollen by acid and thereby made hollow, have been proposed in Japanese laid-open Patent Publication No. 25315 of 1998.
However, these hollow particles had such problems as not expressing cationic properties at high pH, becoming lowered in strength when used as a filler due to the particles being soft, and the like.
Though an excellent method of producing hollow crosslinked polymer particles has been proposed in Japanese Laid-open Patent Publication No. 127336 of 1987, a method of producing cationic hollow crosslinked polymer particles in a more stable manner has been demanded.
Cationic polymers are used for example in the binder resin of the topcoat of a coat having an acrylic paint or other paint, which uses an anionic resin as the binder resin and is generally used as the interior and exterior paint for a building, as the substrate. As paint resins, cationic polymers exhibit such characteristic performance as forming a coat that is excellent in adhesion properties, forming a strong, cured film with a resin with an epoxy group, and the like.
However, since titanium oxide, calcium carbonate, and the like, which are generally used as the pigments for paints, are anionic, paints containing these pigments and yet having a cationic resin as the binder resin had the disadvantage of being poor in preservation stability.
Meanwhile, though hollow resin particles are effective for realizing lightweight coats and are used as pigments of high hiding property, such particles generally have an anionic surface, and when blended with a paint having a cationic resin as the binder resin, the preservation stability of the paint is poor as in the case where the abovementioned titanium oxide, calcium carbonate, and the like, is blended as the pigment.
Also, since prior hollow resin particles had the disadvantage of becoming dissolved in the plasticizers and organic solvents that are normally used in the paint composition or melting in the process of stoving, paints using hollow resin particles as the pigment were used only in very limited fields.
A cationic electrodeposition paint generally contains various additives, such as a film-forming cationic resin, a curing agent, a pigment component, an aqueous medium, and a surfactant, and the like. The pigment component that is usually contained in such an electrodeposition paint is an inorganic pigment, such as titanium dioxide, kaolin, clay, talc, and the like.
However, the specific gravities of such inorganic pigments are inherently higher than that of the aqueous medium. Also, since the pigment interface is anionic, a cationic electrodeposition paint that contains a cationic resin and the abovementioned pigments are generally poor in dispersion stability. When the dispersion stability of a pigment is poor, the stability of the electrodeposition paint that contains the pigment will be poor, making the control of the electrodeposition bath complex, and since the electrodeposited coat that is formed will also be non-uniform, the quality of the electrodeposited coat can be low in terms of hiding property, and the like, in some cases.
Inorganic pigments, such as calcium carbonate, titanium oxide, and the like, are added to thermoplastic resins, thermosetting resins, and other resin materials to add such performance as hardness, rigidity, whiteness, opacity, and the like.
However, the use of an inorganic pigment had the disadvantage that the lightweight property that is inherent of the resin material is lowered by the high specific gravity of the inorganic material.
The method of using hollow polymer particles has been tried as a means of improvement with regard to this disadvantage. However, since conventionally used hollow polymer particles are anionic and since many of the resin materials are anionic as well, the affinity between the two was inadequate, and these methods therefore had such problems to be solved as being insufficient in the abovementioned improvement of performance and the lowering of the excellent mechanical performance inherent to the resin materials.
Opacity and whiteness are required in many paper products. As a means of adding such performance, the loading of an inorganic pigment, such as talc, clay, calcium carbonate, titanium oxide, and the like, as a filler in the papermaking process to obtain filled paper has been known in general.
The problems of such fillers comprised of inorganic pigment include the following:
(1) The high specific gravity of the filler leads to increased weight of the filled paper.
(2) Since the filler is high in specific gravity and since the surface charges give the filler distinct ionic properties, the filler tends to sediment readily and is therefore not loaded sufficiently, making the yield of loading and uniformity of dispersion of the filler poor.
The method of using hollow polymer particles has been tried as a means of solving the above problems. However, though this method prevents the increasing of the weight of the filled paper, the heat resistance, solvent resistance, and resistance against chemicals of the filled paper are not adequate. Also, the poor affinity of the hollow polymer particles with fibers causes lowering of the strength of the filled paper.
Meanwhile, with printed paper, a paper coating composition, containing an inorganic pigment and a binder component, is generally applied to improve the printing performance. However, the use of an inorganic pigment leads to such problems as the increasing of the weight of the paper, poor dispersion of the pigment in the coating composition, and the like.
The method of using hollow polymer particles in place of an inorganic pigment has been tried as a means of s
Futami Satoshi
Tamori Kouji
Tsuruoka Katsuhiko
Harlan Robert
JSR Corporation
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