Sealing members and method of producing the same

• US 20050248102A1
• Filed: 02/09/2005
• Published: 11/10/2005
• Est. Priority Date: 02/10/2004
• Status: Abandoned Application

• Current Assignee: Inoac Corporation (Inoue Rubber Public Company Limited), Rogers Inoac Corporation
• Original Assignee: Inoac Corporation (Inoue Rubber Public Company Limited), Rogers Inoac Corporation
• Inventors: Sato, Tadashi
• Application Number:
  US11/054,620
• Publication Number:
  US 20050248102A1
• Time in Patent Office: Days
• US Class Current: 277/650
• CPC Class Codes: C08G 18/6674 with compounds of group C08G18/3203
• CPC Class Codes: C08G 2110/0008 flexible
• CPC Class Codes: C08G 2190/00 Compositions for sealing or packing joints
• CPC Class Codes: C09K 3/1021 Polyurethanes or derivatives thereof
• CPC Class Codes: F16J 15/102 characterised by material
• CPC Class Codes: F16J 15/108 Special methods for making a non-metallic packing

Abstract

A sealing member comprising an elastic sheet having a density in the range of 100 to 250 kg/m³. The elastic sheet is obtained by reacting and curing a polyurethane-foam raw material which is provided by mixing 100% by volume of a resin raw material and 300% by volume or more of a foam-forming gas, in which the resin raw material includes polyol and isocyanate as a main raw material and a foam stabilizer as an auxiliary material, and the like. The compression load deflection at 50% of the elastic sheet is in the range of 0.003 to 0.025 MPa, and the compression load deflection at 75% thereof is in the range of 0.02 to 0.40 MPa.

Claims

1. A sealing member comprising:

an elastic sheet having a density in a range of 100 to 250 kg/m³ in which the sheet was formed by reacting and curing a polyurethane-foam raw material having 100% by volume of a resin raw material and 300% by volume or more of a foam-forming gas mixed therewith, the elastic sheet having a compression load deflection at 50% in the range of 0.003 to 0.025 MPa, and the compression load deflection at 75% thereof being in the range of 0.02 to 0.40 MPa, wherein the resin raw material contains polyol and isocyanate as a main raw material and a foam stabilizer as an auxiliary material.

2. The sealing member according to claim 1, wherein the polyurethane-foam raw material includes a feed direction, and is reacted and cured in a state in which its thickness is restricted along the feeding direction, whereby surface roughness of the elastic sheet is prevented and smoothed.

3. The sealing member according to claim 1, wherein the relative dielectric constant of the elastic sheet at each of the frequencies of 10 kHz, 100 kHz and 1 MHz is in the range of 1 to 2.0.

4. The sealing member according to claim 1, wherein the thickness of the elastic sheet is in the range of 0.3 to 3.0 mm.

5. The sealing member according to claim 1, wherein the polyurethane-foam includes cells and the cell diameters are in a range of 20 to 500 μ

m.

6. The sealing member according to claim 5, wherein the cell diameters are in the range of 20 to 300 μ

m.

7. A method of producing a sealing member, the method comprising:

supplying a resin raw material containing polyol and isocyanate as a main raw material and a foam stabilizer as an auxiliary material;

feeding a polyurethane-foam raw material having 100% by volume of the resin raw material and 300% by volume or more of a foam-forming gas mixed, onto a substrate film;

controlling the thickness of the polyurethane-foam raw material to be within a range of 0.3 to 3.0 mm; and

promoting the reaction and curing of the fed polyurethane-foam raw material so as to produce an elastic sheet comprising a polyurethane-foam having a thickness in the range of 0.3 to 3.0 mm, a density set arrange of 100 to 250 kg/m³, a compression load deflection at 50% in a range of 0.003 to 0.025 MPa, and a compression load deflection at 75% in a range of 0.02 to 0.40 MPa.

8. The method of producing a sealing member according to claim 7, wherein the polyurethane-foam raw material comprises polyol having a EO (ethylene oxide (CH₂CH₂O)_n) unit, and the ratio of the EO (ethylene oxide (CH₂CH₂O)_n) unit in the polyol is 20% or less.

9. The method of producing a sealing member according to claim 7, wherein said promoting the reaction includes heating the fed polyurethane-foam raw material at a temperature of 150°

C. to 200°

C. so as to promote the reaction and curing of the fed polyurethane-foam raw material.

10. The method of producing a sealing member according to claim 7, wherein the thickness of the fed polyurethane-foam raw material is controlled by using a thickness-controlling means.

11. The method of producing a sealing member according to claim 10, wherein the thickness-controlling means includes a surface-protecting film.