# US 2018/0022896 A1 · Stabilization Of Polyamides

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- Number: US 2018/0022896 A1
- Document ID: US20180022896A1
- Status: Published application
- Kind: A1
- Application number: 15/541,975
- Filed: 2015-12-18
- Published: 2018-01-25
- Earliest claimed: 2015-01-07
- Assignees: Clariant Plastics & Coatings Ltd
- Applicants: Clariant Plastics & Coatings Ltd
- Inventors: Christoph KROEHNKE; Matthias ZAEH
- Web page: https://patentgrep.com/patent/US20180022896A1

## CPC

- C08K 5/3435: Piperidines
- C07D 405/14: containing three or more hetero rings
- C08K 5/3462: Six-membered rings
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)

## Abstract

The invention relates to a method for stabilization of polyamides, which comprises admixing the polyamides before or during processing with an effective amount of one or more compounds of formula (1) where R1 and R2 each represent a sterically hindered cyclic amine.

## Claims

### Claim 1

A method for the stabilization of at least one polyamide, comprising the step of admixing the at least one polyamide before or during processing with an effective amount of one or more compounds of formula (1)
wherein R1 and R2 are each a sterically hindered cyclic amine.

### Claim 2 (depends on 1)

The method as claimed in claim 1, wherein the admixing step forms at least one stabilized polyamide having increased heat resistance, light resistance, chemical resistance or a combination thereof.

### Claim 3 (depends on 1)

The method as claimed in claim 1, wherein the moieties R1 and R2 to are of the formula (2a), (2b) or (2c)
wherein
R3 is H, C1-C5 alkyl or C1-C10 alkoxy,
R4 is H, C1-C4 alkyl or C6 cycloalkyl, and
R5 is H or C1-C4 alkyl.

### Claim 4 (depends on 1)

The method as claimed in claim 1, wherein R1 and R2 are the same or different and are each a moiety of formula (2d), (2e) or (2f)
wherein
R3 is H or C1-C2 alkyl, and
R5 is H or methyl.

### Claim 5 (depends on 1)

The method as claimed in claim 1, wherein the admixing step further comprises adding the compound of formula (1) to the at least one polyamide in an amount of 0.05 to 10.0 wt %, based on the overall weight (100 wt %) of the at least one stabilized polyamide.

### Claim 6 (depends on 1)

The method as claimed in claim 1, wherein the admixing step further comprises adding the compound of formula (1) to the at least one polyamide in an amount of 0.25 to 1.0 wt %, based on the overall weight (100 wt %) of the at least one stabilized polyamide.

### Claim 7 (depends on 1)

The method as claimed in claim 1, wherein the at least one polyamide is a homopolyamide, a copolyamide, a mixture of polyamides or a mixture between a polyamide and one or more other polymers.

### Claim 8 (depends on 1)

The method as claimed in claim 1, wherein the admixing step further comprises mixing the one or more compounds of formula (1) with the at least one polyamide in an extruder or kneader, before or during the melting or spinning, or before or during the polycondensation process of the at least one polyamide, with or without a subsequent pelletization, spinning or shaping process.

### Claim 9 (depends on 1)

The method as claimed in claim 1, wherein the one or more compounds of formula (1) is admixed to the at least one polyamide in the form of a masterbatch.

### Claim 10

A stabilizer masterbatch comprising from 5 to 95 wt % of one or more compounds of formula (1)
wherein R1 and R2 are each a sterically hindered cyclic amine, and from 95 to 5 wt % of a thermoplastic carrier polymer.

### Claim 11 (depends on 10)

The stabilizer masterbatch as claimed in claim 10, wherein the thermoplastic carrier polymer is a polyamide.

### Claim 12

A stabilized polyamide comprising at least one compound of formula (1)
wherein R1 and R2 are each a sterically hindered cyclic amine.