Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Compositions to be polymerized by wave energy wherein said...
Reexamination Certificate
2000-02-25
2002-11-05
Seidleck, James J. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Compositions to be polymerized by wave energy wherein said...
C522S074000, C522S075000, C522S077000, C522S079000, C522S080000, C522S096000, C522S097000, C522S104000, C522S120000, C522S100000, C522S121000, C522S122000, C522S182000, C522S107000, C106S400000, C106S401000, C106S482000, C106S490000, C106S499000, C106S491000, C427S508000, C427S512000, C427S518000, C428S035700, C428S036920, C252S600000
Reexamination Certificate
active
06476093
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a frost-coating composition. More specifically, the present invention relates to a frost-coating composition which forms on a glass container a frosted coating having excellent alkali-washing resistance, further, relates to a frost-coating composition which forms on a glass container a frosted coating having not only excellent alkali-washing resistance but also excellent impact resistance. Herein, glass containers involve glass bottles, glassware such as cups and dishes, and vases.
BACKGROUND OF THE INVENTION
A glass container with a frostily finished surface, so-called “a frosted glass container” is extensively used as a container for foods, beverages, alcoholic liquors, cosmetics and others because it prevents UV transmission and improves a design to impart an impression of high quality to the container. Generally, in order to finish a surface of a glass container frosty, a method is used in which the surface is etched with a hydrofluoric acid solution with added salts such as ammonium fluoride, or a mixed solution of hydrofluoric acid and sulfuric acid with added salts such as ammonium fluoride. Although this method provides a fine frosted surface, the use of a strong acid, such as hydrofluoric acid as an etching agent, makes the handling of agents difficult and requires many steps of washing with an acid and water. Thus, there are problems such as treatment of acidic waste water and others in respect of safety, environments, productivity, costs and the like. As a method for finishing a surface of a glass container frosty without using such harmful agents, a method of mixing a fine silica particle as a matting agent into a thermosetting resin or a photocurable resin to form a frosted coating on the surface of the glass container is disclosed in JP-A 2518/1978 and JP-B 68418/1993.
However, when a frosted glass container is immersed into a washing solution such as an aqueous sodium hydroxide solution in a step of alkali washing, such a frosted coating obtained by the above method has significant and practical problems that the coating turns white and, sometimes, peels from the container.
In addition, when a glass container passes through an alkali washing line or a bottling line, cracking and peeling of the coating sometimes occur by collision between glass bottles. Thus, there has been desired to enhance the impact resistance of the coating.
The present invention was done to solve the above problems in such a coating composition. The first object of the present invention is to provide a coating composition that forms a frosted coating having excellent alkali resistance on a glass container.
The second object of the present invention is to provide a coating composition that forms a frosted coating having excellent impact resistance as well as excellent alkali resistance on a glass container.
Further, the object of the present invention is to provide a frosted glass container coated with such a coating composition.
DISCLOSURE OF THE INVENTION
The present inventors considered that the prior art frosted coatings were affected to be whitened and the like in a step of alkali washing due to poor alkali resistance of a fine silica particle incorporated as a matting agent. Thus, we made every effort to study on kinds and natures of matting agents. Consequently, we found that the alkali resistance of a frosted coating could be significantly improved by using a hydrophobic fine silica particle as a matting agent and that the impact resistance could be significantly improved by using, as a matting agent, a hydrophobic fine silica particle having excellent alkali resistance and at the same time by further using a fine polymer particle within the range where the alkali resistance was not deteriorated, which resulted in the completion of the present invention.
That is, in the first aspect, the present invention provides a frost-coating composition comprising 5-50 parts by weight of a hydrophobic fine silica particle based on 100 parts by weight of a photocurable compound.
In the first aspect of the present invention, a frosted coating having excellent alkali resistance can be formed by mixing a photocurable compound and a hydrophobic fine silica particle without using any strong acid as an etching agent.
In addition, in the second aspect, the present invention provides a frost-coating composition comprising 5-50 parts by weight of a hydrophobic fine silica particle and 3-30 parts by weight of a fine polymer particle based on 100 parts by weight of a photocurable compound.
In the second aspect of the present invention, the properties of excellent impact resistance due to a fine polymer particle can be manifested besides the properties of excellent alkali resistance possessed by the above frosted coating formed by mixing a photocurable compound and a hydrophobic fine silica particle. Thus, it is considered that a synergistic effect is obtained without impeding the characteristics each other.
According to the second aspect of the present invention, a coating composition can be provided, which forms a frosted coating having excellent impact resistance as well as excellent alkali resistance on a glass container.
DETAILED DESCRIPTION OF THE INVENTION
The fist aspect and the second aspect of the present invention will be successively described in details below.
[The First Aspect]
A photocurable compound used in the first aspect of the present invention is not limited to specified ones but may be any compound which is cured by irradiation of an active energy ray such as visible light or UV light to give a conventional resin used for plastic-coating of a glass container. As the above photocurable compound, there are, for example, mainly a reactive compound having two or more (meth)acryloyl groups in the molecule, and a compound containing, as needed, a monofunctional monomer containing one (meth)acryloyl group in the molecule (hereinafter, referred to as “diluting monomer”). Additionally, “(meth)acryl” means herein both “acryl” and “methacryl”.
The weight proportion of the reactive compound in the photocurable compound used in the first aspect of the present invention may be 100%, but is usually 95-5% and, preferably 90-10% from a viewpoint of the toughness of the cured resin coating and the curability of the coating.
As the above reactive compound, there are, for example, (1) polyhydric (meth)acrylates resulting from bonding of two or more (meth)acrylic acids to polyhydric alcohols, (2) polyester (meth)acrylates resulting from bonding of two or more (meth)acrylic acids to polyester polyols obtained by the reaction of polyhydric alcohols and polybasic acids, (3) epoxy-modified (meth)acrylates obtained by esterifying the epoxy groups of epoxy compounds having two or more epoxy groups in the molecule with (meth)acrylic acids to form (meth)acryloyl groups as a functional group, and (4) polyurethane (meth)acrylates obtained by reacting polyvalent isocyanate compounds with hydroxyl group-containing (meth)acrylates. Among them, polyhydric (meth)acrylates and epoxy-modified (meth)acrylates are preferably used from a viewpoint of the strength of the cured resin coating.
Examples of the above polyhydric (meth)acrylate are not limited to but include diethylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, bisphenol A di(meth)acrylate, trimethylolpropane tri(meth)acrylate, dipentaerythritol hexa(meth)acrylate, and compounds represented by the general formula (1):
(wherein R represents H, F or CH
3
).
Examples of the above epoxy-modified (meth)acrylate are not limited to but include bisphenol A epoxy-modified (meth)acrylate, glycerol diglycidyl ether-modified (meth) acrylate, neopentyl glycol diglycidyl ether-modified (meth)acrylate and ethylene glycol diglycidyl ether-modified (meth)acrylate.
As the above diluting monomer, there are, for example, 2-hydroxypropyl (meth)acrylate, dicyclopentenyloxyethyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate and isobornyl (meth)acrylate.
In order to cont
Araki Eiichi
Fukunami Motofumi
Kuroda Yoshikazu
Manabe Hiroshi
Sugihara Norihiro
Jones Tullar & Cooper PC
McClendon Sanza L.
Seidleck James J.
Sumitomo Seiki Chemicals Co., Ltd.
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