# US 5,346,985 A · Drawable high tensile strength aramids

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- Number: US 5,346,985 A
- Document ID: US5346985A
- Status: Granted
- Kind: A
- Application number: 07/772,383
- Filed: 1991-09-30
- Granted: 1994-09-13
- Earliest claimed: 1991-09-30
- Assignees: E. I. Du Pont de Nemours and Company
- Inventors: Robert S. Irwin
- Web page: https://patentgrep.com/patent/US5346985A

## CPC

- C08G 69/32: from aromatic diamines and aromatic dicarboxylic acids with both amino and carboxylic groups aromatically bound
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

Aramids, which in the drawn state have high tensile strengths tensile elongations, and tensile moduli, are made from units derived from selected 2,2'-disubstituted-4,4'-bibenzoic acids, 3,4'-oxydibenzoic acid or 3,4'-dicarboxybenzophenone, p-phenylenediamine, and optionally terephthalic acid. The aramids are useful for ropes and composites.

## Claims

### Claim 1

A drawable aramid random copolymer, consisting essentially of, of up to about 10 mole percent of a first unit of the formula ##STR7## about 30 to about 70 mole percent of a second unit of the formula ##STR8## and about 70 to about 30 mole percent of a third unit of the formula ##STR9## wherein X.sup.1 and X.sup.2 are independently selected from the group consisting of chlorine, bromine, nitro and methyl.

### Claim 2 (depends on 1)

An aramid as recited in claim 1 which contains about 35 to about 65 mole percent of said second units and about 65 to about 35 mole percent of said third units.

### Claim 3 (depends on 2)

An aramid as recited in claim 2 which contains about 45 to about 55 mole percent of said second units and about 55 to about 45 mole percent of said third units.

### Claim 4 (depends on 3)

An aramid as recited in claim 3 wherein each said X.sup.1 and said X.sup.2 are chlorine or methyl.

### Claim 5 (depends on 4)

An aramid as recited in claim 4 which is drawn.

### Claim 6 (depends on 4)

An aramid as recited in claim 4 wherein said X.sup.1 and said X.sup.2 are chlorine.

### Claim 7 (depends on 2)

An aramid as recited in claim 2 wherein said X.sup.1 and said X.sup.2 are identical.

### Claim 8 (depends on 2)

An aramid as recited in claim 2 wherein each said X.sup.1 and X.sup.2 are chlorine or methyl.

### Claim 9 (depends on 2)

An aramid as recited in claim 2 that is drawn.

### Claim 10 (depends on 1)

An aramid as recited in claim 1 wherein said X.sup.1 and said X.sup.2 are identical.

### Claim 11 (depends on 10)

An aramid as recited in claim 10 wherein each said X.sup.1 and said X.sup.2 are chlorine or nitro.

### Claim 12 (depends on 10)

An aramid as recited in claim 10 wherein said X.sup.1 and said X.sup.2 are chlorine.

### Claim 13 (depends on 1)

An aramid as recited in claim 1 that is drawn.

### Claim 14 (depends on 1)

An aramid as recited in claim 1 in the form of a fiber.

### Claim 15 (depends on 1)

An aramid as recited in claim 1 in the form of a film.

### Claim 16 (depends on 1)

An aramid as recited in claim 1 which contains up to about 5% of said first units.