# US 7,744,724 B2 · Polyareneazole/thermoplastic pulp and methods of making same

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- Number: US 7,744,724 B2
- Document ID: US7744724B2
- Status: Granted
- Kind: B2
- Application number: 11/639,932
- Filed: 2006-12-15
- Published: 2007-06-28
- Granted: 2010-06-29
- Earliest claimed: 2005-12-21
- Assignees: E.I. du Pont de Nemours and Company
- Inventors: Achim Amma; Stephen D. Maloney; Mikhail R. Levit
- Web page: https://patentgrep.com/patent/US7744724B2

## CPC

- D21H 13/20: from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B 16/0608: {Fibrilles, e.g. fibrillated films}
- C04B 26/02: Macromolecular compounds
- C09K 3/1028: {Fibres}
- F16D 69/026: {containing fibres}
- D21H 13/14: Polyalkenes, e.g. polystyrene {polyethylene}
- D21H 13/24: Polyesters
- D21H 17/35: Polyalkenes, e.g. polystyrene
- D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES

## Abstract

The present invention relates to thermoplastic and polyareneazole pulp for use as reinforcement material in products including for example fluid sealing materials, as a processing aid including its use as a thixotrope, and as a filter material. The pulp comprises (a) irregularly shaped, thermoplastic fiber fibrous structures, (b) irregularly shaped, polyareneazole fibrous structures and (c) water, whereby thermoplastic fiber fibrils and/or stalks are substantially entangled with polyareneazole fibrils and/or stalks. The invention further relates to processes for making such thermoplastic and polyareneazole pulp.

## Claims

### Claim 1

A pulp for use as reinforcement or processing material, comprising:
(a) fibrillated polyolefin fibrous structures, the structures being 60 to 97 weight percent of the total solids;
(b) fibrillated polyarenazole fibrous structures being 3 to 40 weight percent of the total solids;
the polyolefin and the polyarenazole fibrous structures having an average maximum dimension of no more than 5 mm, a length-weighted average length of 0.7 mm to 1.3 mm, and stalks and fibrils where the polyolefin fibrils and/or stalks are substantially entangled with the polyarenazole fibrils and/or stalks.

### Claim 2 (depends on 1)

The pulp of claim 1, wherein the polyolefin fibrous structures are about 60 to 75 weight percent of the total solids.

### Claim 3 (depends on 1)

The pulp of claim 1, wherein the polyarenazole fibrous structures are about 25 to 40 weight percent of the total solids.

### Claim 4 (depends on 1)

The pulp of claim 1 having a Canadian Standard Freeness (CSF) of 100 to 700 ml.

### Claim 5 (depends on 1)

The pulp of claim 1, wherein the polyolefin is polypropylene or polyethylene.

### Claim 6 (depends on 1)

The pulp of claim 1, wherein the polyarenazole is a rigid rod polybenzazole or rigid rod polypyridazole polymer.

### Claim 7 (depends on 6)

The pulp of claim 6, wherein the polybenzazole is a polybenzobisoxazole.

### Claim 8 (depends on 6)

The pulp of claim 6, wherein the polypyridazole is a polypyridobisimidazole.

### Claim 9 (depends on 1)

A filter material comprising the pulp of claim 1 and a binder.

### Claim 10 (depends on 1)

A fluid sealing material comprising the pulp of claim 1 and a binder selected from the group consisting of nitrile rubber, butadiene rubber, neoprene, styrene butadiene rubber, nitrile-butadiene rubber, and mixtures thereof.

### Claim 11 (depends on 1)

A thixotrope comprising the pulp of claim 1.

### Claim 12 (depends on 1)

A concrete or masonry material reinforced by the pulp of claim 1.