Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Reexamination Certificate
2002-06-27
2004-02-03
Le, H. Thi (Department: 1773)
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
Reexamination Certificate
active
06686047
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to reactive particles, a composition comprising the reactive particles, and the cured products. More particularly, the present invention relates to reactive particles used for a resin composition exhibiting excellent curability (the characteristics of easily forming cured coatings in a short period of time) and capable of forming coatings with high hardness, superior scratch resistance, excellent abrasion resistance, low curling properties, and superb adhesion, particularly coatings with well balanced hardness and low curling properties, on the surface of various substrates such as, for example, plastics (polycarbonate, polymethacrylate, polystyrene, polyester, polyolefin, epoxy resins, melamine resins, triacetyl cellulose resins, ABS resins, AS resins, norbornene resins, etc.), metals, woods, papers, glasses, and slates, as well as a curable composition comprising the reactive particles, and the cured products made from the curable composition. The curable composition containing the reactive particles and the cured product of the present invention are suitable for use, for example, as a protective coating material to prevent stains or scratches on plastic optical parts, touch panels, film-type liquid crystal elements, plastic containers, or flooring materials, wall materials, and artificial marbles which are used for architectural interior finish; as an adhesive for various substrates, a sealing material, and a vehicle for printing ink; and the like.
PRIOR ART
In recent years, a curable composition exhibiting excellent capability of forming cured materials and forming coatings with all of the requirements such as excellent hardness, scratch resistance, abrasion resistance, low curling properties, adhesion, and transparency, resistance to chemicals, and appearance is desired as a protective coating material to prevent stains or scratches on the surface of various substrates, an adhesive for various substrates, a sealing material, or a vehicle for printing ink.
A number of compositions satisfying these requirements have been proposed. However, no compositions which satisfactorily satisfy all of the requirements such as excellent curability as a curable composition, and high hardness, superior scratch resistance, abrasion resistance, low curling properties, superb adhesion, and excellent transparency, and chemicals resistance when made into cured coatings have not been obtained.
For example, U.S. Pat. No. 3,451,838 and U.S. Pat. No. 2,404,357 propose the use of compositions comprising a hydrolyzate of alkoxysilane and colloidal silica as major components to be used as a heat-curable coating material. However, because these heat-curable coating materials are reacted at a high temperature after application to substrates, these materials exhibit problems such as softening or deformation (shrinkage, swelling, etc.) of the substrates and poor cured material productivity when used for the above-described plastic substrates.
Japanese Patent Publication No. 21815/1987 proposed a composition for a radiation curable coating material comprising acrylate and particles of colloidal silica of which the surface is modified by methacryloxy silane. This type of radiation curable compositions are used in a number of applications in recent years due to the excellent productivity cured materials. However, because the radiation curable compositions usually form cured coatings by radical polymerization, the cure degree in the neighborhood of the surface of coatings is not sufficient due to the effect of dissolved oxygen in the polymerization system. Appearance of cured coatings may change by chemicals such as organic solvents, acids, or alkalis. Thus, the coatings made from radiation curable compositions have a problem of poor chemicals resistance.
PROBLEMS TO BE SOLVED BY THE INVENTION
The present invention has been completed in view of the above-described problems and has an object of providing reactive particles used for a curable composition exhibiting excellent productivity of cured materials and capable of forming coatings with high hardness, scratch resistance, abrasion resistance, low curling properties, and adhesion, and chemicals resistance, especially excellent chemicals resistance, on the surface of various substrates, as well as the curable composition comprising the reactive particles, and the cured products made from the curable composition.
MEANS FOR SOLVING THE PROBLEMS
As a result of extensive studies to achieve the above object, the inventors of the present invention have found that cured coatings exhibiting well balanced characteristics, particularly exhibiting excellent chemicals resistance without impairing high hardness, superior scratch resistance, low curling properties, good abrasion resistance can be obtained from a curable composition comprising reactive particles prepared by bonding: (a) particles comprising at least one oxide of an element selected from the group consisting of silicon, aluminum, zirconium, titanium, zinc, germanium, indium, tin, antimony, and cerium, (b) a first organic compound (b1) having a radically polymerizable unsaturated group and a hydrolyzable group in the molecule, and a second organic compound (b2) containing cationically polymerizable group and a hydrolyzable group in the molecule
PREFERRED EMBODIMENT OF THE INVENTION
The reactive particles, the curable composition comprising the reactive particles, and the cured products thereof of the present invention will now be described in more detail.
I. Reactive Particles (A)
The reactive particles (A) of the present invention are prepared by bonding: (a) particles comprising at least one oxide of an element selected from the group consisting of silicon, aluminum, zirconium, titanium, zinc, germanium, indium, tin, antimony, and cerium (hereinafter called “oxide particles (a) or “component (a)”), (b) an organic compound (b1) having a radically polymerizable unsaturated group and a hydrolyzable group in the molecule (hereinafter called “first organic compound (b1)”), and an organic compound (b2) containing a hydrolyzable group and a group selected from the group consisting of an oxetane group, 3,4-epoxycyclohexyl group, and epoxy group in the molecule (hereinafter called “second organic compound (b2)”) (hereinafter may be called “component (b)” or “modification component (b)”).
1. Oxide Particles (a)
For obtaining colorless cured coatings from the curable composition, the oxide particles (a) used in the present invention should be particles of at least one oxide of an element selected from the group consisting of silicon, aluminum, zirconium, titanium, zinc, germanium, indium, tin, antimony, and cerium.
Examples of suitable oxides are silica, alumina, zirconia, titanium oxide, zinc oxide, germanium oxide, indium oxide, tin oxide, indium-tin oxide (ITO), antimony oxide, and cerium oxide. Preferably, silica, alumina, zirconia, and antimony oxide are applied from the viewpoint of high hardness. These compounds may be used either individually or in combination of two or more. In addition, oxide particles of these elements are preferably in the form of a powder or a solvent dispersion sol. When the oxide particles are in the form of a dispersion, an organic solvent is preferable as a dispersion medium from the viewpoint of mutual solubility with other components and dispersibility. Examples of organic solvents are alcohols such as for example methanol, ethanol, isopropanol, butanol, and octanol; ketones such as for example acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone; esters such as for example ethyl acetate, butyl acetate, ethyl lactate, and &ggr;-butyrolactone, propylene glycol monomethyl ether acetate, and propylene glycol monoethyl ether acetate; ethers such as for example ethylene glycol monomethyl ether and diethylene glycol monobutyl ether; aromatic hydrocarbons such as for example benzene, toluene, and xylene; and amides such as for example dimethylformamide, dimethylacetamide, and N-methylpyrrolidone. Preferable organic
Nishiwaki Isao
Ukachi Takashi
Yamaguchi Yoshikazu
Yashiro Takao
DSM N.V.
Le H. Thi
LandOfFree
Reactive particles, curable composition comprising the same... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Reactive particles, curable composition comprising the same..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reactive particles, curable composition comprising the same... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3284084