# US 6,221,500 B1 · Crosslinkable polymer compounds for lead wire insulation, gaskets and liners in a refrigeration environment

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- Number: US 6,221,500 B1
- Document ID: US6221500B1
- Status: Granted
- Kind: B1
- Application number: 09/373,253
- Filed: 1999-08-12
- Granted: 2001-04-24
- Earliest claimed: 1999-08-12
- Assignees: Champlain Cable Corporation
- Inventors: Stefan Ultsch
- Web page: https://patentgrep.com/patent/US6221500B1

## CPC

- H01B 3/307: {Other macromolecular compounds}
- C08L 23/08: Copolymers of ethene (C08L23/16 takes precedence)
- C08L 23/0876: Salts thereof, i.e. ionomers
- C08L 27/16: Homopolymers or copolymers or vinylidene fluoride
- C08L 77/00: Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain (of polyhydrazides C08L79/06; of polyamideimides or polyamide acids C08L79/08); Compositions of derivatives of such polymers
- C08L 77/12: Polyester-amides
- C08L 2203/202: use in electrical wires or wirecoating
- Y10T 428/31681: Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.]
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Insulation compounds are described that have been formulated for use in a refrigeration environment. The materials consist of crosslinkable compounds made from ionomer (EAS), polyether block amide (PEBA), polybutyleneterephthalate (PBT) homo- or copolymers, and/or polyvinylidenefluoride (PVDF). The insulation compounds are intended for use as wire insulation and in the fabrication of gaskets and liners. The compounds show superior resistance to refrigerants such as HCFC-22, HCFC-123, and HFC-134a. Crosslinking provides resistance to creeping under heat and pressure.

## Claims

### Claim 1

A melt extrudable, crosslinkable polymer insulation composition for use in a refrigeration environment, comprising:
a) approximately 50 to 100 vol % of at least one ionomer, and
b) approximately 0 to 50 vol % of polyether block amides consisting of linear chain rigid polyamide segments interspaced with flexible polyether segments, and wherein (a) and (b) are cross-linked to provide a polymer insulation that withstands a harsh refrigeration environment.

### Claim 2 (depends on 1)

The polymer insulation composition in accordance with claim 1, wherein said at least one ionomer comprises 75 to 85 vol %.

### Claim 3 (depends on 1)

The polymer insulation composition in accordance with claim 1, wherein said polyether block amides comprise 15 to 30 vol %.

### Claim 4 (depends on 1)

The polymer insulation composition in accordance with claim 1, wherein said polyether block amides comprise 15 to 30 vol %.

### Claim 5 (depends on 1)

The polymer composition in accordance with claim 1, wherein said polymer composition is radiation crosslinked.

### Claim 6 (depends on 1)

Motor lead wires extrusion coated with the polymer composition in accordance with claim 1.