WATERPROOF VENTILATION STRUCTURE, WATERPROOF VENTILATION MEMBER, AND WATERPROOF AIR-PERMEABLE MEMBRANE

• US 20140283691A1
• Filed: 03/25/2014
• Published: 09/25/2014
• Est. Priority Date: 03/25/2013
• Status: Abandoned Application

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: FURUUCHI, Kouji
• Application Number:
  US14/224,729
• Publication Number:
  US 20140283691A1
• Time in Patent Office: Days
• US Class Current: 96/12
• CPC Class Codes: B01D 53/268 by diffusion
• CPC Class Codes: B01D 71/32 containing fluorine atoms
• CPC Class Codes: B01D 71/36 Polytetrafluoroethene
• CPC Class Codes: B29C 55/00 Shaping by stretching, e.g. drawing through a die; Apparatus therefor B29C61/08 takes precedence
• CPC Class Codes: B29C 55/005 characterised by the choice of materials
• CPC Class Codes: B29K 2027/18 PTFE, i.e. polytetrafluorethene , e.g. ePTFE, i.e. expanded polytetrafluorethene
• CPC Class Codes: B29K 2105/04 cellular or porous
• CPC Class Codes: B32B 1/00 Layered products having a non-planar shape
• CPC Class Codes: B32B 1/08 Tubular products
• CPC Class Codes: B32B 2250/02 2 layers
• CPC Class Codes: B32B 2264/0257 Polyolefin particles, e.g. polyethylene or polypropylene homopolymers or ethylene-propylene copolymers
• CPC Class Codes: B32B 2264/108 Carbon, e.g. graphite particles
• CPC Class Codes: B32B 2307/518 bi-axially
• CPC Class Codes: B32B 2307/724 Permeability to gases, adsorption
• CPC Class Codes: B32B 2307/7265 Non-permeable
• CPC Class Codes: B32B 2457/00 Electrical equipment
• CPC Class Codes: B32B 2605/00 Vehicles
• CPC Class Codes: B32B 27/00 Layered products comprising a layer of synthetic resin fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/12 next to a fibrous or filamentary layer
• CPC Class Codes: B32B 27/14 : next to a particulate layer
• CPC Class Codes: B32B 27/20 : using fillers, pigments, thixotroping agents
• CPC Class Codes: B32B 27/322 : comprising halogenated polyolefins, e.g. PTFE
• CPC Class Codes: B32B 5/022 : Non-woven fabric
• CPC Class Codes: B32B 5/024 : Woven fabric
• CPC Class Codes: B32B 5/22 : characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed layer formed of natural mineral fibres or particles next to a foam layer B32B19/047, next to a layer made of particles B32B19/048, or next to a fibrous or filamentary layer B32B19/06; paper layer or cardboard layer next to a paper layer or cardboard layer B32B29/005, next to a foam layer B32B29/007, next to a fibrous or filamentary layer B32B29/02, or next to a particulate layer B32B29/04
• CPC Class Codes: B32B 7/00 : Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
• CPC Class Codes: B32B 7/03 : with respect to the orientation of features direction of fibres or filaments B32B5/12
• CPC Class Codes: H04R 1/086 : Protective screens, e.g. all weather or wind screens
• CPC Class Codes: H04R 1/28 : Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means combinations of transducers with horns, i.e. front-loaded horns H04R1/30
• CPC Class Codes: H05K 5/0213 : Venting apertures; Constructional details thereof
• CPC Class Codes: H05K 5/0215 : with semi-permeable membranes attached to casings
• CPC Class Codes: H05K 5/0216 : Venting plugs comprising semi-permeable membranes

Abstract

A waterproof ventilation structure according to the present invention includes: a housing having an interior space and an opening communicating the interior space with an exterior space; and a waterproof air-permeable membrane covering the opening. The waterproof air-permeable membrane is a layered product including a first stretched porous polytetrafluoroethylene (PTFE) membrane containing a filler and a second stretched porous PTFE membrane not containing a filler. The waterproof air-permeable membrane is disposed so that the second stretched porous PTFE membrane is located closer to the interior space than the first stretched porous PTFE membrane. The present invention provides a waterproof ventilation structure configured such that a filler is less likely to fall in a housing.

Claims

1. A waterproof ventilation structure comprising:

a housing having an interior space and an opening communicating the interior space with an exterior space; and

a waterproof air-permeable membrane covering the opening,

wherein

the waterproof air-permeable membrane is a layered product comprising a first stretched porous polytetrafluoroethylene membrane containing a filler and a second stretched porous polytetrafluoroethylene membrane not containing a filler, and

the waterproof air-permeable membrane is disposed so that the second stretched porous polytetrafluoroethylene membrane is located closer to the interior space than the first stretched porous polytetrafluoroethylene membrane.

2. The waterproof ventilation structure according to claim 1, wherein the layered product includes a two-layer membrane in which the first stretched porous polytetrafluoroethylene membrane and the second stretched porous polytetrafluoroethylene membrane are directly laminated together.

3. The waterproof ventilation structure according to claim 2, wherein the layered product consists of the two-layer membrane.

4. A waterproof ventilation member comprising:

a waterproof air-permeable membrane; and

a fixing member bonded to a peripheral portion of the waterproof air-permeable membrane,

wherein the waterproof air-permeable membrane is a layered product comprising a first stretched porous polytetrafluoroethylene membrane containing a filler and a second stretched porous polytetrafluoroethylene membrane not containing a filler.

5. The waterproof ventilation member according to claim 4, wherein the layered product includes a two-layer membrane in which the first stretched porous polytetrafluoroethylene membrane and the second stretched porous polytetrafluoroethylene membrane are directly laminated together.

6. The waterproof ventilation member according to claim 5, wherein the layered product consists of the two-layer membrane.

7. A waterproof air-permeable membrane that is a layered product comprising:

a first stretched porous polytetrafluoroethylene membrane containing a filler; and

a second stretched porous polytetrafluoroethylene membrane not containing a filler.

8. The waterproof air-permeable membrane according to claim 7, wherein the layered product includes a two-layer membrane in which the first stretched porous polytetrafluoroethylene membrane and the second stretched porous polytetrafluoroethylene membrane are directly laminated together.

9. The waterproof air-permeable membrane according to claim 8, wherein the layered product consists of the two-layer membrane.