Antistatic gloves and process for making same

Inactive Publication Date: 2008-12-11
ALLEGIANCE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]The present invention encompasses rubber elastomeric articles with desirable static resistivity or antistatic properties and methods of making same. It has been surprisingly discovered that rubber-containing elastomeric articles, e.g., gloves, can be manufactured which exhibit desirable antistatic properties without requiring the ad

Problems solved by technology

However, natural rubber does not exhibit good static resistivity.
However, a concern with such a black-colored article is shedding of the conductive black particles which can cause contamination problems.
Moreover, carbon black would darken and blacken the resulting article which is aesthetically unappealing and potentially visually distracting to the user and may interfere with the precision of handling instruments.
Nor does Bialke et al. recognize the antistatic properties of such a combination.
Sakaki et al. does not disclose latex layers consisting of a

Method used

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  • Antistatic gloves and process for making same
  • Antistatic gloves and process for making same
  • Antistatic gloves and process for making same

Examples

Experimental program
Comparison scheme
Effect test

example 1

Comparative Static Testing of Gloves

[0040]Three types of glove samples were tested for static resistance properties and compared. The gloves were composed of:

[0041]1) 100% natural rubber;

[0042]2) 100% nitrile rubber; and

[0043]3) two layers, the outermost layer comprising 80% nitrile rubber and 20% natural rubber, laminated directly to an innermost layer comprising 80% natural rubber and 20% nitrile rubber prepared using the process described below.

[0044]For the two-layered glove, one glove sample was tested for static resistance properties. For 100% nitrile rubber gloves, eight different commercially available gloves and six different lab dipped gloves were each tested for static resistance properties (see Table 1). For 100% natural rubber gloves, different gloves were tested for static resistance properties. Each glove sample was tested for surface resistivity, volume resistivity and static decay time (SDT) as set forth above. For each glove sample, three specimens (prepared from t...

examples 2-6

Detailed Preparation of Gloves

[0050]The method 100 used in preparing examples 2-7, comprises:[0051](1) preparing a latex composition composed of a majority of nitrile rubber for a first layer and a latex composition composed of a majority of natural rubber for a second layer,[0052](2) dipping and forming the gloves 200, and[0053](3) chlorinating the gloves 300 and making powder-free clean room gloves.

Preparation of Latex Compounds

[0054]Two latex compositions were prepared and blended, each comprising a nitrile rubber latex and a natural rubber latex. A first latex composition included a majority of a nitrile rubber latex and formed a first layer, the outer layer, of the antistatic glove. A second latex composition included a majority a natural rubber latex and formed a second layer, the inner donning side, of the antistatic glove.

First Latex Composition

[0055]Raw nitrile rubber latex (composed of about 39% acrylonitrile, about 58% butadiene, and about 3% carboxylic acid) was stirred ...

example 2

[0066]A multilayer nitrile / natural rubber latex laminate glove with an outer layer comprising 100% nitrile rubber latex and an inner layer comprising 100% natural rubber latex was prepared in a manner similar to the procedures described above. The first latex composition comprised 100% nitrile rubber latex (and 0% natural rubber latex) and the second latex composition comprised 100% natural rubber latex (and 0% nitrile rubber latex). This particular glove showed delamination of the two layers immediately after heat curing in the oven.

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Abstract

The present invention is directed to antistatic elastomeric articles and methods of making the same. The articles can be single layered or multilayered. The single layered articles possess desirable antistatic properties and desirable properties of comfort and feel. The multilayered articles have an outermost layer/surface that possesses desirable antistatic properties and an innermost layer/surface that exhibits desirable properties of comfort and feel. In preferred embodiments, the elastomeric articles are made form a nitrile/natural rubber blend. Articles of the present invention have antistatic properties measured as having a surface resistivity below about 1014 Ω/sq and a static decay time of less than about 60 seconds.

Description

FIELD OF THE INVENTION[0001]The invention relates to the field of elastomeric articles such as gloves. In particular, the invention pertains to elastomeric gloves that can be used in industrial and medical applications wherein the elastomeric gloves exhibit desirable static resistivity or antistatic properties while retaining desirable softness and feel properties.BACKGROUND OF THE INVENTION[0002]Elastomeric articles, such as gloves, are well known in the industrial and medical fields for their ability to form a protective chemical, microbial, and physical barrier between the external environment and the user's skin. Various physical and chemical properties of gloves, and the elastomers they are made from, are desirable for a variety of applications. In certain fields where articles such as gloves and finger cots are widely used, such as electronic assembly, desirable properties include comfort and softness of feel, maintenance of tactile sensitivity and surface static resistivity.[...

Claims

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Application Information

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IPC IPC(8): C08G71/04C08K3/22C08K3/30
CPCA41D19/015A41D31/0066B29C41/14B29C41/22B32B25/14B32B2307/21C08J5/02C08J2307/02C08J2313/02C08L7/02C08L13/02C08L2666/08A41D31/26C09D107/02C09D109/04
Inventor CHEN, SEONG FONGWONG, WEI CHEONGLOW, CHII YIH
Owner ALLEGIANCE CORP
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