Unlock instant, AI-driven research and patent intelligence for your innovation.

Conductive polymer foams, method of manufacture, and uses thereof

A technology of polymers and foams, applied in conductive materials dispersed in non-conductive inorganic materials, transportation and packaging, thin material processing, etc., can solve problems such as difficulty in obtaining conductive foams

Inactive Publication Date: 2010-02-10
环球产权公司
View PDF3 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to obtain high quality conductive foam for EMI / RFI shielding

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Conductive polymer foams, method of manufacture, and uses thereof
  • Conductive polymer foams, method of manufacture, and uses thereof
  • Conductive polymer foams, method of manufacture, and uses thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0144] Nickel microspheres and nickel-coated ceramic microspheres were evaluated as conductive fillers in polysiloxane foams. Polysiloxane (Dow Corning Silicone 8137 and NUSIL 6033 from NusilTechnology LLC), filler microspheres and polysiloxane cure inhibitor (1-octyn-3-ol from Aldrich Chemical Co.) Mixed in a speed mixer, cast on PET film at controlled thickness and placed in an oven exposed to an adjustable magnetic field. Typically, the chemically foamed and cured foam has a thickness of 70 to 80 mils (1778 to 2032 microns).

[0145] The results in Table 1 show that no electrical conductivity was observed in the thick cured foam layer even under strong magnetic fields up to 1200 Gauss.

[0146] Table 1

[0147] Test serial number

1

2

3

4

5

6

7

magnetic field, gauss

250

250

1000

1000

1200

1200

1200

Cast thickness, mil

10

20

20

20

20

...

Embodiment 2

[0151] Table 2 shows the results of additional testing with 100% nickel microspheres. Formulations were cast to a thickness of 18 to 40 mils (457 to 1016 microns) to prepare foam samples.

[0152] Test serial number

[0153] In the tests shown in Table 2, the formation of filler columns was observed; however, the foam was not conductive. Tests 1 to 3 were cast without a top carrier, resulting in poor foam quality. Analysis of Tests 4-13 indicated that the cured foam had a thickness of 40 to 120 mils (1016 to 3038 microns) and had two or more cells (z-direction) spanning the thickness of the foam.

Embodiment 3

[0155] Thinner foams were prepared using 100% nickel spheres or silver coated nickel spheres, both with and without top support, as indicated. Chill the premix in the freezer. Results are shown in Table 3A.

[0156] Test serial number

1a

1b

2a

2b

3a

3b

4a

4b

magnetic field, gauss

500

500

250

250

250

250

250

250

Cast thickness, mil

5

5

5

5

5

5

10

10

Oven temperature, ℃

55

55

55

55

50

50

50

50

Oven residence time, minutes

5

5

5

5

5

5

5

5

top carrier

none

Have

none

Have

none

Have

none

Have

base

PET

PET

PET

PET

PET

PET

PET

PET

Si formulation, A / B, g

33 / 3.3

33 / 3.3

33 / 3.3

33 / 3.3

33 / 3.3

...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
thicknessaaaaaaaaaa
sizeaaaaaaaaaa
Login to View More

Abstract

A method of manufacturing a polymer foam composite is described, the method comprising forming an article having a first surface and an opposite second surface from a precursor composition, the precursor composition comprising a polymer foam precursor composition, and a filler composition comprising a plurality of magnetic, electrically conductive particles; foaming the precursor composition to form a plurality of cells in precursor composition; applying a magnetic field to the foamed precursor composition, wherein the magnetic field is of a strength and applied for a time effective to align the electrically conductive, magnetic particles into mutually isolated chains between the first surface and the opposite second surface of the article; and solidifying the polymer foam precursor composition to provide a polymer foam composite having a density of about 1 to about 125 pounds per cubic foot and a volume resistivity of about 10-3 ohm-cm to about 103 ohm-cm at a pressure of 60 pounds per square inch. Polymer foam composites made by this method are also described, as well as articles formed therefrom.

Description

technical field [0001] The present invention relates to conductive polymer foams and methods of making them, as well as articles comprising the polymer foams. Background technique [0002] Conductive polymer foams are used in a variety of applications including electrical contact devices, in sensors and in applications requiring electromagnetic interference (EMI) / radio frequency interference (RFI) shielding and / or static elimination. Exemplary materials capable of EMI / RFI shielding include metal foil or metalized fabric wrapped around a non-conductive foam pad, and a non-conductive pad coated with a conductive material. Materials suitable for static elimination include conductive fillers incorporated into various polymers such as polysiloxanes, polyurethanes, and polyolefins. One disadvantage of using conductive fillers is that adding conductive fillers in amounts sufficient to obtain high conductivity affects the compressibility and processability of the polymer. Furtherm...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/00C08L75/04C08L83/04H01B1/20
CPCC08J2383/04C08J2375/04C08J9/0066C08K3/08C08K2201/016Y10T428/249953C08J9/228H01B1/22
Inventor 斯科特·S·辛普森
Owner 环球产权公司