Moisture sensor comprising conductive particles and a hygroscopic polymer of polyvinyl alcohol
First Claim
1. A moisture sensor comprising a moisture sensitive film having conductive particles dispersed in a hygroscopic polymer between a pair of electrodes, the hygroscopic polymer being a modified polyvinyl alcohol which is obtained by saponifying a polymer comprising vinyl ester units and 0.1 to 15 mol % of ethylenically unsaturated carboxylic acid units such that the vinyl ester units is saponified to a degree of at least 30 mol %.
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Accused Products
Abstract
A moisture sensitive film having conductive particles dispersed in a hygroscopic polymer is disposed between a pair of electrodes to construct a moisture sensor. The hygroscopic polymer is a modified polyvinyl alcohol which is obtained by saponifying a polymer comprising vinyl ester units and 0.1 to 15 mol % of ethylenically unsaturated carboxylic acid units such that the vinyl ester units are saponified to a degree of at least 30 mol %. The moisture sensor has improved condensing/drying cycle performance and moisture resistance.
28 Citations
3 Claims
- 1. A moisture sensor comprising a moisture sensitive film having conductive particles dispersed in a hygroscopic polymer between a pair of electrodes, the hygroscopic polymer being a modified polyvinyl alcohol which is obtained by saponifying a polymer comprising vinyl ester units and 0.1 to 15 mol % of ethylenically unsaturated carboxylic acid units such that the vinyl ester units is saponified to a degree of at least 30 mol %.
Specification
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- Resources
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Current AssigneeTDK Corporation
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Original AssigneeTDK Corporation
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InventorsKobayashi, Nobuo
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Primary Examiner(s)Le, Hoa T.
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Application NumberUS08/982,890Time in Patent Office896 DaysField of Search338/34, 338/35, 34/528, 428/323, 428/913US Class Current428/323CPC Class CodesG01N 27/121 for determining moisture co...G01N 27/126 comprising organic polymersY10T 428/25 Web or sheet containing str...
