# US 4,391,741 A · Polyoxymethylene composition

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- Number: US 4,391,741 A
- Document ID: US4391741A
- Status: Granted
- Kind: A
- Application number: 06/051,417
- Filed: 1979-06-25
- Granted: 1983-07-05
- Earliest claimed: 1977-03-10
- Assignees: Asahi Kasei Kogyo Kabushiki Kaisha
- Inventors: Junzo Masamoto; Minoru Hamada; Isamu Suzuki; Takeo Yoshida
- Web page: https://patentgrep.com/patent/US4391741A

## CPC

- C08K 3/04: Carbon
- C08L 59/02: Polyacetals containing polyoxymethylene sequences only
- C08L 23/06: Polyethylene
- Y10S 260/17: High polymeric, resinous, antistatic agents
- 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)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A polyoxymethylene composition comprising (a) 100 parts by weight of polyoxymethylene, (b) 2 to 15 parts by weight of electrically conductive carbon black, and (c) 2 to 20 parts by weight of low-density polyethylene has excellent antistatic properties. Shaped articles produced by the polyoxymethylene composition show excellent effects on preventing noise due to static electricity and adhesion of dust.

## Claims

### Claim 1

A composition comprising:
(a) 100 parts by weight of polyoxymethylene,
(b) 4 to 10 parts by weight of electrically conductive carbon black selected from the group consisting of oil furnace blacks, furnace blacks and acetylene blacks, and
(c) 10 to 18 parts by weight of low-density polyethylene, wherein said composition has a surface electrical resistance of 10.sup.13 ohms or less.

### Claim 2 (depends on 1)

A composition according to claim 1, wherein polyoxymethylene is a homopolymer of formaldehyde, trioxane or tetraoxane, having stabilized end groups.

### Claim 3 (depends on 1)

A composition according to claim 1, wherein polyoxymethylene is a copolymer or terpolymer of formaldehyde, trioxane or tetraoxane with one or more copolymerizable monomers.

### Claim 4 (depends on 1)

A composition according to claim 1, wherein polyoxymethylene has weight average molecular weight of 30,000 to 200,000.

### Claim 5 (depends on 1)

A composition according to claim 1, wherein low-density polyethylene has a melt index measured according to ASTM D-1238 of 2 g/10 min. to 400 g/10 min.

### Claim 6 (depends on 1)

A composition according to claim 1, which contains
(b) 4 to 6 parts by weight of electrically conductive carbon black, and
(c) 10 to 15 parts by weight of low-density polyethylene per 100 parts by weight of polyoxymethylene.

### Claim 7 (depends on 1)

A composition according to claim 1, wherein the amount of electrically conductive carbon black is 4 to 10 parts by weight.