Fibers made from soluble polymers

Patent metadata

Field	Value
Publication number	US-2016333501-A1
Application number	US-201615219455-A
Country	US
Kind code	A1
Filing date	Jul 26, 2016
Priority date	Sep 21, 2011
Publication date	Nov 17, 2016
Grant date	—

Abstract

A fiber can be made having a structure with an axial core and a coating layer. The fiber can have a polymer core and one or two layers surrounding the core. The fine fiber can be made from a polymer material and a resinous aldehyde composition such that the general structure of the fiber has a polymer core surrounded by at least a layer of the resinous aldehyde composition.

First claim

1 . A fiber comprising a nonreactive polymer and a self-crosslinked resinous aldehyde composition.

2 . The fiber of claim 1 wherein the nonreactive polymer and self-crosslinked resinous aldehyde composition forms a uniform mixture in a semi-interpenetrating network morphology.

3 . The fiber of claim 1 wherein the fiber comprises a core phase and a coating phase; wherein the core phase comprises a nonreactive polymer and the coating phase comprises a self-crosslinked resinous aldehyde composition.

4 . The fiber of claim 3 comprising two phases, wherein the core phase comprises a mixture of the polymer and the resinous aldehyde composition.

5 . The fiber of claim 3 comprising three phases, wherein the core phase comprises the polymer, the coating phase comprises the resinous aldehyde composition, and a transition phase comprises a mixture of the polymer and the resinous aldehyde composition.

6 . The fiber of claim 3 which is prepared from a resinous aldehyde composition comprising reactive alkoxy groups and a nonreactive polymer.

7 . The fiber of claim 3 wherein the resinous aldehyde composition is present in an amount of greater than 20 parts by weight per 100 parts by weight of the polymer.

8 . The fiber of claim 1 which is a fine fiber.

9 . The fiber of claim 1 wherein the resinous aldehyde composition comprises a resinous formaldehyde composition.

10 . The fiber of claim 9 wherein the resinous formaldehyde composition comprises a resinous melamine-formaldehyde composition.

11 . The fiber of claim 1 wherein the resinous aldehyde composition comprises a melamine-aldehyde composition; and wherein the aldehyde comprises formaldehyde, acetaldehyde, butyraldehyde, isobutyraldehyde, or mixtures thereof.

12 . The fiber of claim 1 wherein the resinous aldehyde composition comprises a condensation product of urea and an aldehyde, a condensation product of phenol and an aldehyde, a condensation product of melamine and an aldehyde, or a mixture thereof.

13 . The fiber of claim 1 wherein the resinous aldehyde composition comprises a Condensation product of benzoguanamine and an aldehyde, a condensation product of glycoluril and an aldehyde, or a mixture thereof.

14 . A fine fiber comprising a core phase and a coating phase; wherein the core phase comprises nonreactive polymer and the coating phase comprises a self-crosslinked resinous melamine-aldehyde composition; wherein the fine fiber is prepared from a resinous melamine-aldehyde composition in an amount of greater than 20 parts by weight per 100 parts by weight of the nonreactive polymer.

15 . A filter media comprising a filtration substrate and a layer comprising a plurality of fine fibers of claim 1 disposed on the substrate.

16 . The filter media of claim 15 wherein the fine fiber layer has a thickness of 0.05 μ to 30 μ.

17 . The filter media of claim 15 wherein the filtration substrate is a non-woven substrate.

18 . The filter media of claim 15 wherein the fine fiber layer is an electrospun layer and the filtration substrate comprises a cellulosic or synthetic nonwoven.

19 . The fine fiber media of claim 15 wherein the filtration substrates comprises a polyester nonwoven, a polyolefin nonwoven, or a blended nonwoven thereof.

20 . The fine fiber media of claim 15 wherein the filtration substrate comprises polypropylene nonwoven.

21 . The fine fiber media of claim 15 wherein the filtration substrate comprises a spunbonded or melt-blown support.

22 . A filter element comprising a fine fiber media of claim 15 .

Assignees

• Donaldson Co Inc

Inventors

• Shenoy Suresh L
• Weik Thomas M

Classifications

• D01D5/0007

  Electro-spinning (non-woven fabrics produced by electro-spinning D04H1/728) · CPC title

• B01D39/1623 Primary

  of synthetic origin · CPC title

• Y10T428/2967

  Synthetic resin or polymer · CPC title

• D04H1/728

  by electro-spinning {(electro-spinning methods and apparatus D01D5/0007)} · CPC title

• C08L2312/00

  Crosslinking · CPC title