Moisture sensor including, as a moisture-absorbing layer, a polymer layer including a mixture of polyamides

• US 9,134,281 B2
• Filed: 03/02/2012
• Issued: 09/15/2015
• Est. Priority Date: 03/03/2011
• Status: Active Grant

• Current Assignee: Commissariat a L'Energie Atomique (AES Corporation)
• Original Assignee: Commissariat a L'Energie Atomique (AES Corporation)
• Inventors: Grange, Hubert
• Primary Examiner(s): Wecker, Jennifer
• Application Number:
  US14/001,917
• Publication Number:
  US 20130336842A1
• Time in Patent Office: 1,292 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: B01D 2253/202 Polymeric adsorbents
• CPC Class Codes: B01D 2253/25 Coated, impregnated or composite adsorbents
• CPC Class Codes: B01J 20/3204 Inorganic carriers, supports or substrates
• CPC Class Codes: B01J 20/3272 Polymers obtained by reactions otherwise than involving only carbon to carbon unsaturated bonds
• CPC Class Codes: B01J 2220/445 comprising a mixture of polymers
• CPC Class Codes: G01N 2291/02845 Humidity, wetness
• CPC Class Codes: G01N 27/12 of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid , for detecting components in the fluid
• CPC Class Codes: G01N 27/121 for determining moisture content, e.g. humidity, of the fluid moisture content of the tested material G01N27/048
• CPC Class Codes: G01N 27/126 comprising organic polymers
• CPC Class Codes: G01N 27/22 by investigating capacitance
• CPC Class Codes: G01N 27/223 for determining moisture content, e.g. humidity rain detectors on vehicle windows B60S1/0825
• CPC Class Codes: G01N 30/00 Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation G01N3/00, G01N5/00, G01N7/00, G01N9/00, G01N11/00, G01N13/00, G01N15/00, G01N17/00, G01N19/00, G01N21/00, G01N22/00, G01N23/00, G01N24/00, G01N25/00, G01N27/00, G01N29/00 take precedence

Abstract

The invention relates to a humidity sensor including, as a humidity absorbent layer, a polymer layer including a blend including a first polyamide and a second polyamide, where the said second polyamide includes, in its repetitive units, a number of carbon atoms greater than that of the repetitive units of the first polyamide.

Claims

1. A humidity sensor including, as a humidity absorbent layer, a single polymer layer consisting solely of polyamides comprising a blend including a first polyamide and a second polyamide, where the said second polyamide includes, in its repetitive units, a number of carbon atoms greater than that of the repetitive units of the first polyamide, and wherein the first polyamide is chosen from among polyamide 6, polyamide 6-6 and polyamide 11, and the second polyamide is chosen from among polyamide 6-6, polyamide 6-10 and polyamide 12.

2. A humidity sensor according to claim 1, wherein the polymer layer includes a blend chosen from among the following blends:

a blend of polyamide 6 and polyamide 6-6;

a blend of polyamide 6 and polyamide 6-10;

a blend of polyamide 6-6 and polyamide 6-10;

a blend of polyamide 11 and polyamide 12.

3. A humidity sensor according to claim 1, wherein the polymer layer includes a blend of polyamide 6 and polyamide 6-6.

4. A humidity sensor according to claim 1, wherein, in the blend, the first polyamide is present relative to the second polyamide in a mass proportion of between 95/5 and 5/95.

5. A humidity sensor according to claim 1, including at least one said polymer layer positioned between a first electrode and a second electrode.

6. A humidity sensor according to claim 5, in which the first electrode and the second electrode are in contact with a same substrate.

7. A humidity sensor according to claim 1, including a beam or a membrane covered, wholly or partly, by said polymer layer.

8. A humidity sensor according to claim 5, wherein the polymer layer includes a blend chosen from among the following blends:

a blend of polyamide 6 and polyamide 6-6;

a blend of polyamide 6 and polyamide 6-10;

a blend of polyamide 6-6 and polyamide 6-10;

a blend of polyamide 11 and polyamide 12.

9. A humidity sensor according to claim 5, wherein the polymer layer includes a blend of polyamide 6 and polyamide 6-6.

10. A humidity sensor according to claim 5, wherein, in the blend, the first polyamide is present relative to the second polyamide in a mass proportion of between 95/5 and 5/95.

11. A humidity sensor according to claim 7, wherein the polymer layer includes a blend chosen from among the following blends:

a blend of polyamide 6 and polyamide 6-6;

a blend of polyamide 6 and polyamide 6-10;

a blend of polyamide 6-6 and polyamide 6-10;

a blend of polyamide 11 and polyamide 12.

12. A humidity sensor according to claim 7, wherein the polymer layer includes a blend of polyamide 6 and polyamide 6-6.

13. A humidity sensor according to claim 7, wherein, in the blend, the first polyamide is present relative to the second polyamide in a mass proportion of between 95/5 and 5/95.