Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Reexamination Certificate
2000-04-14
2003-11-04
Nolan, Sandra M. (Department: 1772)
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
C002S161700, C002S168000, C428S036800, C428S147000, C428S143000, C428S144000, C428S492000, C428S495000, C428S496000, C428S507000, C428S520000, C428S523000
Reexamination Certificate
active
06641879
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an acrylic resin glove which is superior in fitting and detaching properties, and a treating agent which is used to improve the lubricity of the interior surface of the glove.
Gloves which have hitherto been applied widely to the filed of household, working, inspection, and operation are classified roughly into a glove made of a rubber and a glove made of a vinyl chloride resin.
Among these gloves, those made of a natural rubber (NR) and a synthetic rubber such as acrylonitrile-butadiene rubber (NBR), styrene-butadiene rubber (SBR) or the like have such a problem that adhesion with hands is enhanced due to its high stickiness and a gummy feel occurs, thereby making it impossible to smoothly fit or detach the glove. In addition, a glove made of the natural rubber (NR) causes allergic conditions due to a protein contained in the natural rubber.
On the other hand, a glove made of a vinyl chloride resin having a large modulus is superior in fitting and detaching properties of the glove, but causes generation of dioxine on disposal and incineration. With the enhancement of the interest in environmental problems, use of the glove has been limited.
Therefore, it has been desired to obtain a glove having excellent fitting and detaching properties while using a material other than the vinyl chloride resin. There have been suggested various gloves, for example, glove wherein a lubricant resin layer is provided on the interior surface of a conventional rubber glove body (Japanese Unexamined Patent Publication (Kokai) No. 11-61527), glove wherein a dry film composed of a film of a modified urethane emulsion and a surface treating layer of a synthetic resin solution containing a fluorine surfactant is provided on the interior surface of a conventional rubber glove body (Japanese Unexamined Utility Model Publication (Kokai) No. 6-4014), glove whose internal surface is coated with an ionic polyurethane and a blend of said polyurethane and the other polymer to impart the lubricity (Japanese Patent No. 2677850).
However, the gloves disclosed in the above Patent Publications require a step of forming a new film by dipping or application and a laminating step by coating, thereby to cause a problem such as complicated production processes, resulting in high production cost. It is also impossible to solve such a problem that fitting and detaching properties are inferior than those of the glove made of the vinyl chloride resin.
Japanese Unexamined Patent Publication (Kokai) No. 8-283522 discloses, as a glove made of the material other than the vinyl chloride resin, a glove obtained by forming a composition comprising a latex of a copolymer of a unsaturated nitrile having a carboxyl group in a molecule and a conjugated diene, and a polyurethane resin emulsion. However, the invention described in the above Patent Publication has an object of improving the oil resistance and solvent resistance, and the fitting and detaching properties of the glove according to the present invention are insufficient as compared with the glove made of the vinyl.
As a conventional method of imparting the lubricity to the interior surface of the glove, there has been made a trial of subjecting to a dusting treatment of adhering lubricants such as talc powder, mica powder, starch, etc. to the interior surface of the glove, or treating the surface with chlorine or implanting the surface with hairs, thereby to reduce a friction coefficient of the surface (i.e. adhesion) and to enhance the lubricity of the interior surface of the glove.
However, the lubricant adhered and hair implanted on the interior surface of the glove are liable to remove from the glove body by repeated use and washing and, therefore, the effect of enhancing the lubricity can not be maintained for a long period. There is a fear that the lubricant is adhered on hands after detaching the glove, thereby to cause contamination of the environment. Therefore, it can not be used in an operation where dust must be drastically avoided, for example, production of electronic parts. There is also a fear that some lubricant causes allergic conditions by touching directly with the skin of hands.
When treating with chlorine, even if only the internal surface of the glove is treated, the external surface is also lubricated, thereby to cause problems such as low workability on fitting of the glove and discoloring of the glove and discoloration of the glove. Upon wrestling with the problems that have attracted special interest recently, persons are liable to avoid products containing chloride. Thus, the treatment with chlorine has been avoided for such a reason.
Therefore, there has recently been made an attempt of improving the lubricity of the interior surface to obtain excellent fitting and detaching properties while keeping the workability on fitting of the glove by providing a layer containing micro-particles on the interior surface of the glove, thus suggesting various interior surface treating agents and methods of treating the interior surface for formation of the above layer as well as various gloves whose internal surface is treated.
Japanese Unexamined Patent Publication (Kokai) No. 8-337910 discloses a NBR glove comprising an acrylic resin layer containing inorganic micro-particles such as silica powders on the interior surface of a glove base composed of an acrylonitrile-butadiene rubber (NBR) latex. Japanese Unexamined Patent Publication (Kokai) No. 4-119102 discloses a glove made of a vinyl chloride resin wherein a layer of a synthetic resin emulsion containing an organic filler is provided to enhance the lubricity of the interior surface.
However, the gloves thus obtained still have insufficient fitting and detaching feels.
Since the NBR glove and glove made of the vinyl chloride resin do not have good adhesion with an acrylic resin layer, there is a fear that an acrylic resin layer is peeled off during the use for a long period.
Japanese Unexamined Patent Publication (Kokai) No. 8-337910 describes that organic micro-particles of the vinyl chloride resin can be used in place of inorganic micro-particles as micro-powders to be added for improving the lubricity of the acrylic resin layer. However, when using vinyl chloride, there is a fear that dioxine is generated on disposal as described above. Furthermore, the invention described in Japanese Unexamined Patent Publication (Kokai) No. 4-119102 relates to a glove made of a vinyl chloride resin and this glove has a problem that the oil resistance and mechanical strength of the glove itself are poor and dioxine is generated on disposal.
The present inventors have found an advantage that a glove made of an acrylic resin has a large modulus and does not cause environmental pollution on disposal, like a bag made of vinyl chloride, in the present invention, thus succeeding in production of the glove. However, a conventional treating agent is not suited for use as an interior surface treating agent for the glove made of an acrylic resin. That is, a conventionally known interior surface treating agent for glove contains a latex as a base and is not suited for practical use because of its low adhesion to the glove made of the acrylic resin.
When only an acrylic resin layer disclosed in Japanese Unexamined Patent Publication (Kokai) No. 8-337910 is formed on the surface of the glove, sufficient lubricity can not be obtained and a rough feel occurs because of the addition of micro-powders. On the other hand, when a layer of a synthetic resin emulsion disclosed in Japanese Unexamined Patent Publication (Kokai) No. 4-119102 is provided on the interior surface of the acrylic resin glove, there is a problem that the layer is easily peeled off because of low adhesion between the both.
Accordingly, a practical interior surface treating agent capable of improving the lubricity of the interior surface of the acrylic resin glove has never been developed.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide an acrylic resin glove which h
Matsuura Ai
Miyamoto Yoshiaki
Ochi Atsuko
Birch & Stewart Kolasch & Birch, LLP
Nolan Sandra M.
Sumitomo Rubber Industries Ltd.
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