Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1988-08-05
1991-05-21
Sluby, P. C.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
428518, 428913, 2168, B32B 516, A41D 1900
Patent
active
050174274
DESCRIPTION:
BRIEF SUMMARY
FIELD OF ART
The present invention relates to a laminate which includes an inner layer having the ability to change its color upon its contact with acid or alkali and which is in the form of, for example, working gloves.
BACKGROUND ART
In the manufacture of electronic parts and elements such as semi-conductor devices and so forth, a variety of chemicals such acids, alkalis, solvents and so forth are used in various treatment operations, starting with deburring of substrates and surface washing.
In carrying out such operations, conventionally it has been practice to make use of working gloves made of material of a laminate structure, comprising rubber or a resin having a rubber elasticity and a substantial resistance to chemicals. However, the treatment operations deal with strongly harmful chemicals such as strong acids and strong alkalis, so that penetration of chemical into the gloves contacted with the chemical, which can occur through any rupture in the glove material, tends to result in a serious accident. Therefore, measures are taken, for example such as to carry out an inspection to locate any breakage in the gloves by a pinhole finding test or to discard used gloves as waste after the lapse of the prescribed length of time of use of the gloves regardless of the possibility that the gloves can still be used.
In the above circumstances, it has been strongly desired in the art to develop such gloves having a laminate structure which have a high degree of safety and are economical.
The present invention has been made in order to obviate the above indicated problems in the art, and is directed in its object to provide a laminate which includes a layer capable of undergoing an internal color change in contact with an acid or an alkali (hereinafter referred to as a color indicator layer) and thereby provide the ability to detect permeation of acid or alkali into the laminate. According to the present invention, it is feasible to provide gloves having such a laminate structure containing a detecting function as above, which are relatively thin and can be used safely and, through the use of which, operations can be facilitated.
DISCLOSURE OF THE INVENTION
To attain the above object, the laminate having an indicator function according to the present invention is characterized by an inner layer and an outer layer, of which the inner layer contains a chemical acid/base indicator.
BEST MODE FOR CARRYING OUT THE INVENTION
Now, a detailed description will be given of the features constituting the present invention.
(1) Outer Layer:
Preferably, the outer layer should be transparent so that a color change of an underlying color indicator layer can be visually ascertained. In addition, the outer should have a resistance to acid and alkali. This outer layer does not necessarily comprise a single layer, but it may comprise a plurality of layers comprising different materials or having different characteristics, as need be.
Although no particular limitation is applied to the material for the outer layer, since this layer is subjected to a direct contact with an acid or an alkali, it is advantageous to make use of such materials as having a substantially resistant to acid and alkali. For example, chlorosulfonated polyethylene, chlorinated polyethylene and butyl rubber are suitably useful, but it is also feasible to use any other rubber or resin, as required.
(2) Inner Layer:
The inner layer, which lies next to the outer layer or outer layers as above, comprises a layer containing a chemical acid/base indicator, namely a color indicator layer which functions to present a color change upon its contact with any acid or an alkali which may migrate into this layer through any breakage in the outer layer or layers.
A chemical acid/base indicator of a suitable color changing characteristic (over a pH range) may be selected and employed for use, by considering the pH value of the particular acid or alkali with which the laminate is usually in contact. As examples of useful indicators phenolphthalein, methyl orange an
REFERENCES:
patent: 4079160 (1978-03-01), Phillipson
patent: 4425161 (1984-01-01), Shibahashi et al.
patent: 4740400 (1988-04-01), Lustig et al.
Isahai Tatsuo
Machida Morihisa
Nakatsumi Hideo
Shiroki Daijiro
Tajima Yoshio
Hitachi , Ltd.
Sluby P. C.
The Yokohama Rubber Co. Ltd.
LandOfFree
Laminate having indicator function does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Laminate having indicator function, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Laminate having indicator function will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-237194