# US 4,391,952 A · Anti-static material and method of making the material

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 4,391,952 A
- Document ID: US4391952A
- Status: Granted
- Kind: A
- Application number: 06/327,485
- Filed: 1981-12-04
- Granted: 1983-07-05
- Earliest claimed: 1981-12-04
- Assignees: Bengal, Inc.
- Inventors: William Lybrand
- Web page: https://patentgrep.com/patent/US4391952A

## CPC

- C09K 3/16: Anti-static materials
- C08K 5/0075: {Antistatics}
- C08K 5/098: Metal salts of carboxylic acids
- C08K 5/17: Amines; Quaternary ammonium compounds
- Y10S 260/16: Antistatic agents containing a metal, silicon, boron or phosphorus
- Y10S 260/19: Non-high polymeric antistatic agents/n
- Y10S 260/21: Polymer chemically or physically modified to impart antistatic properties and methods of antistatic agent addition
- Y10S 524/91: Antistatic compositions
- Y10S 524/912: Contains metal, boron, phosphorus, or silicon
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

Polyethylene having a relatively high specific gravity is modified to inhibit the production of static charges. A weak salt having properties of ionizing and having its positive ions bond chemically to the polyethylene is mixed in the polyethylene. A chemical agent is also dispersed in the polyethylene and is provided with properties of facilitating the dispersion of the positive ions of the weak salt throughout the polyethylene of high specific gravity for chemical bonding to the polyethylene. The weak salt may be cupric acetate and the chemical agent may be an amine. The amine is preferably ethoxylated. The material of this invention may be formed as non-transparent bags or as sheets. The material may be formed by mixing the different chemicals and extruding the mixture under conditions of controlled temperatures and pressures and for controlled dwell times.

## Claims

### Claim 1

In combination for eliminating static charges by providing a resistivity of approximately 10.sup.6 to 10.sup.9 ohms,
a polyethylene of high specific gravity,
copper acetate dispersed in the polyethylene in a weight of approximately 24 grams per 100 pounds of polyethylene, and
an ethoxylated amine dispersed in the polyethylene in a weight of approximately 1,044 grams per 100 pounds of polyethylene.

### Claim 2 (depends on 1)

The combination set forth in claim 1 wherein
the specific gravity of the polyethylene is between approximately 0.055 and 0.985.

### Claim 3

A method of making anti-static material by providing a resistivity in the range of approximately 10.sup.6 to 10.sup.9 ohms, including the following steps:
mixing polyethylene of a high specific gravity, copper acetate in a weight of approximately 24 grams per 100 pounds of polyethylene and an ethoxylated amine in a weight of approximately 1,044 grams per 100 pounds of polyethylene, and
extruding the mixture of the polyethylene, the copper acetate and the ethoxylated amine at a controlled temperature less than approximately 420.degree. F. and a controlled pressure less than 2,000 psi and with a controlled dwell time less than approximately 90 seconds.

### Claim 4 (depends on 3)

The method set forth in claim 3 wherein
the controlled pressure is less than approximately 1,000 psi for a non-vented extrusion and is less than approximately 2,000 psi for a vented extrusion.

### Claim 5 (depends on 3)

The method set forth in claim 3 wherein
the polyethylene has a specific gravity between approximately 0.955 and 0.985.

### Claim 6 (depends on 5)

The method set forth in claim 5 wherein
the temperature is approximately 400.degree. F.

### Claim 7 (depends on 6)

The method set forth in claim 6 wherein
the controlled pressure is less than approximately 1,000 psi for a non-vented extrusion and is less than approximately 2,000 psi for a vented extrusion.