# US 10,865,288 B2 · Low phosphorus low color polyamides

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- Number: US 10,865,288 B2
- Document ID: US10865288B2
- Status: Granted
- Kind: B2
- Application number: 15/314,837
- Filed: 2015-03-19
- Published: 2017-04-20
- Granted: 2020-12-15
- Earliest claimed: 2014-05-30
- Assignees: Ascend Performance Materials Operations LLC
- Applicants: Ascend Performance Materials Operations LLC
- Inventors: Steven C. Manning; Roger C. Ayotte
- Web page: https://patentgrep.com/patent/US10865288B2

## CPC

- C08K 3/32: Phosphorus-containing compounds
- C08K 5/09: Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K 5/098: Metal salts of carboxylic acids
- C08L 77/06: Polyamides derived from polyamines and polycarboxylic acids (C08L77/10 takes precedence)
- C08K 2003/329: {Phosphorus containing acids}
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

The present invention provides a low-phosphorus polyamide compound and a process for preparing such a polyamide.

## Claims

### Claim 1

A low-color polyamide comprising:
a phosphorus-containing compound, wherein the phosphorus-containing compound contains 25 to 50 ppm of phosphorus and 1,200 to 1,800 ppm of a carboxylic acid,
where the polyamide has a yellowness index (YI) of −4 to −9,
where the polyamide has a relative viscosity (RV) range of 40 to 80, and
where an amount of phosphorous greater than 50 ppm increases the probability of phosphate plate out in equipment used to prepare or process the polyamide.

### Claim 2 (depends on 1)

The polyamide according to claim 1, wherein the carboxylic acid is selected from the group consisting of acetic acid, propionic acid and benzoic acid.

### Claim 3 (depends on 1)

The polyamide according to claim 1, wherein the phosphorus-containing compound is hypophosphorus acid or a salt thereof.

### Claim 4 (depends on 1)

The polyamide according to claim 1, wherein the polyamide has a RV in a range of 40 to 50.

### Claim 5 (depends on 1)

The polyamide according to claim 1, wherein the polyamide is nylon 6,6.

### Claim 6 (depends on 1)

The polyamide according to claim 1, further comprising at least one selected from the group consisting of glass fibers, waxes, minerals, carbon fibers, chain terminators, viscosity modifiers, plasticizers, heat stabilizers, UV stabilizers, colorants, impact modifiers, flame retardants, delusterants, fillers, antimicrobial agents, antistatic agents and optical brighteners.

### Claim 7 (depends on 1)

The polyamide according to claim 1, further comprising a metal stearate present in an amount of 250 to 1500 ppm on a surface of the polyamide.

### Claim 8 (depends on 7)

The polyamide according to claim 7, wherein the metal stearate is selected from the group consisting of aluminum, iron, lead, lithium, magnesium, sodium and potassium stearates.

### Claim 9 (depends on 7)

The polyamide according to claim 7, wherein the metal stearate is aluminum distearate.

### Claim 10 (depends on 1)

An article comprising the polyamide according to claim 1.