US4391741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyoxymethylene composition
Assignee: Asahi Kasei Corp
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Filing: 1979-06-25
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Granted: 1983-07-05
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Expires: 1999-06-25
Abstract
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.
Inventors
- 👤 Junzo Masamoto
- 👤 Minoru Hamada
- 👤 Isamu Suzuki
- 👤 Takeo Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:10
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08L; C08L59/00; C08L59/02; C08L23/00; C08L23/02; C08L23/04; C08L23/06; Y; Y10; Y10S; Y10S260/00; Y10S260/15; Y10S260/17
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
61 words
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 13 ohms or less.
Claim 2
Dependent Claim
61 words
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 13 ohms or less.
Claim 3
Dependent Claim
20 words
A composition according to claim 1, wherein polyoxymethylene is a homopolymer of formaldehyde, trioxane or tetraoxane, having stabilized end groups.
Claim 4
Dependent Claim
24 words
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 5
Dependent Claim
17 words
A composition according to claim 1, wherein polyoxymethylene has weight average molecular weight of 30,000 to 200,000.
Claim 6
Dependent Claim
26 words
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 7
Dependent Claim
38 words
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 8
Dependent Claim
21 words
A composition according to claim 1, wherein the amount of electrically conductive carbon black is 4 to 10 parts by weight.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-04 | 1987-01-03 | 1987-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-04 | 1991-01-03 | 1991-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-04 | 1995-01-03 | 1995-07-05 | $7700.00 | Window Closed / Lapsed |