Electrical insulation material

Patent metadata

Field	Value
Publication number	US-9437348-B2
Application number	US-201113069679-A
Country	US
Kind code	B2
Filing date	Mar 23, 2011
Priority date	Dec 17, 2010
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

Provided in at least one embodiment is a nonwoven paper layer directly fused on one or both sides with a nonwoven fabric layer wherein one or both of the nonwoven paper and nonwoven fabric are electrically insulating.

First claim

What is claimed is:

1. An article comprising:
a nonwoven paper layer directly fused on one or both sides with a nonwoven fabric layer wherein one or both of the nonwoven paper and nonwoven fabric are electrically insulating,
wherein the nonwoven paper comprises:
about 50 wt % to about 80 wt % of an inorganic filler selected from the group consisting of kaolin clay, talc, calcium carbonate, alumina trihydrate, montmorillonite, smectite, bentonite, illite, chlorite, sepiolite, attapulgite, halloysite, vermiculite, laponite, rectorite, perlite, aluminum nitride, silicon carbide, boron nitride, and combinations thereof, and
about 3 wt % to about 10 wt % polymer latex binder, and

wherein the nonwoven fabric comprises:
about 20 wt % to about 70 wt % binder fibers, wherein the binder fibers comprise at least one of bicomponent binder fibers and undrawn binder fibers, and
about 30 wt % to about 80 wt % staple fibers, wherein the staple fibers comprise para-aramid staple fibers.

2. The article of claim 1 having a composite part dielectric breakdown strength of greater than or equal to 150 volts/mil according to ASTM D149-09.

3. The article of claim 1 wherein the nonwoven paper further comprises aramid fibers.

4. The article of claim 3 wherein the aramid fibers of the nonwoven paper are one or both of para-aramid and meta-aramid fibers.

5. The article of claim 1 wherein the nonwoven paper further comprises about 10 to about 30 wt % aramid fibers.

6. The article of claim 1 wherein the nonwoven paper further comprises non-aramid fibers selected from the group consisting of polyphenylene sulfide, polyester, polyamides, acrylic, melamine, glass, and polyimide.

7. The article of claim 1 wherein the polymer latex binder is selected from the group consisting of acrylic latex, styrene acrylic latex, natural rubber latex, and combinations thereof.

8. The article of claim 1 wherein the binder fibers of the nonwoven fabric further comprise non-aramid fibers selected from the group consisting of polyphenylene sulfide, polyester, glycol-modified polyester, polyphenyl sulfone, polypropylene, and combinations thereof.

9. The article of claim 1 wherein of the nonwoven paper layer comprises more than one sheet of nonwoven paper.

10. The article of claiml wherein the nonwoven fabric layer comprises more than one sheet of nonwoven fabric.

11. The article of claim 1 comprising about 49 to about 95 wt % nonwoven paper and about 5 to about 51 wt % nonwoven fabric.

12. The article of claim 1 having one nonwoven paper layer and one nonwoven fabric layer, and comprising about 66 to about 95 wt % nonwoven paper and about 5 to about 34 wt % nonwoven fabric.

13. The article of claim 1 having one nonwoven paper layer between two nonwoven fabric layers, and comprising about 49 to about 93 wt % nonwoven paper and about 7 to about 51 wt % nonwoven fabric.

Assignees

• Turpin Robert H
• Stankes David S
• Fox Martin H
• Huang Mitchell T
• 3M Innovative Properties Co

Inventors

• Turpin Robert H
• Stankes David S
• Fox Martin H
• Huang Mitchell T

Classifications

• D21H21/18

  Reinforcing agents · CPC title

• Y10T442/693

  Including a paper layer · CPC title

• D21H13/10

  Organic non-cellulose fibres · CPC title

• B32B5/024

  Woven fabric · CPC title

• D21H17/67

  Water-insoluble compounds, e.g. fillers, pigments · CPC title