EP0339910A1
Expired / Lapsed
EP
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Polyoxymethylene resin composition and process for the preparation thereof
Assignee: Polyplastics Co Ltd
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Filing: 1989-04-24
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Granted: —
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Expires: 2009-04-24
Abstract
Abstract A polyoxymethylene composition comprises (A) polyoxymethylene,(B-1) 1 to 60 percent by weight of carbon fiber and (B-2) 0.1 to 15 percent by weight, based on the carbon fiber, of a polyurethane, optionally comprising (C) up to 50 percent by weight of an inorganic filler other than carbon fiber, the total amount of (B-1), (B-2) and (C) being not more than 70 percent by weight. Before mixing the components, the carbon fiber may be treated with a polyurethane to attach the polyurethane to the surface of the carbon fiber.
Inventors
- 👤 Tsuyoshi Minamisawa
- 👤 Masamichi Mitsuuchi
- 👤 Hiroshi Kitamura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 15:00
CPC Classifications
C; C08; C08L; C08L59/00; C08L59/02; C08K; C08K7/00; C08K7/02; C08K7/04; C08K7/06; C08K9/00; C08K9/08; C08L75/00; C08L75/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
58 words
A polyoxymethylene composition which comprises (A) polyoxymethylene, (B-1) 1 to 60% by weight, based on the total weight of the composition, of carbon fiber, and (B-2) 0.1 to 15% by weight, based on the carbon fiber, of a polyurethane, the total weight of (B-1) and (B-2) being not more than 70% of the total weight of the composition.
Claim 2
Dependent Claim
58 words
A polyoxymethylene composition which comprises (A) polyoxymethylene, (B-1) 1 to 60% by weight, based on the total weight of the composition, of carbon fiber, and (B-2) 0.1 to 15% by weight, based on the carbon fiber, of a polyurethane, the total weight of (B-1) and (B-2) being not more than 70% of the total weight of the composition.
Claim 3
Dependent Claim
53 words
A polyoxymethylene composition as claimed in claim 1, which further comprises (C) up to 50% by weight, based on the total weight of the composition, of an inorganic filler other than carbon fiber, the total weight of (B-1), (B-2) and (C) being not more than 70% of the total weight of the composition.
Claim 4
Dependent Claim
32 words
A polyoxymethylene composition as claimed in claim 1 or claim 2, in which the carbon fiber(B-1) is of a type prepared by firing an acrylic fiber or a fiber made from pitch.
Claim 5
Dependent Claim
32 words
A polyoxymethylene composition as claimed in any preceding claim, in which the carbon fiber(B-1) has a diameter of about 4 to 20 µm and an average fiber length of 0.03 to 10mm.
Claim 6
Dependent Claim
31 words
A polyoxymethylene composition as claimed in claim 4, in which the carbon fiber(B-1) has a diameter of about 5 to 15 µm and an average fiber length of 0.1 to 10mm.
Claim 7
Dependent Claim
27 words
A polyoxymethylene composition as claimed in any preceding claim, in which the weight of carbon fiber(B-1) is 5 to 50% of the total weight of the composition.
Claim 8
Dependent Claim
33 words
A polyoxymethylene composition as claimed in any preceding claim, in which the carbon fiber(B-1) has the polyurethane(B-2) adhering to its surface or is in the form of a strand impregnated with the polyurethane(B-2).
Claim 9
Dependent Claim
27 words
A polyoxymethylene composition as claimed in any preceding claim, in which the weight of the polyurethane(B-2) is 0.5 to 10%, based on the weight of carbon fiber(B-1).
Claim 10
Dependent Claim
45 words
A process for preparing a polyoxymethylene composition, which comprises the steps of treating carbon fiber with a polyurethane so as to attach the polyurethane to the surface of the carbon fiber, mixing the polyurethane-treated carbon fiber with a polyoxymethylene and melting and kneading the mixture.
Claim 11
Dependent Claim
45 words
A process for preparing a polyoxymethylene composition, which comprises the steps of treating carbon fiber with a polyurethane so as to attach the polyurethane to the surface of the carbon fiber, mixing the polyurethane-treated carbon fiber with a polyoxymethylene and melting and kneading the mixture.
Claim 12
Dependent Claim
24 words
A process as claimed in claim 9, which further comprises a step of mixing an organic filler other than carbon fiber with the mixture.
References Cited (Backward Citations)
DE3302012A1
Cited
EP0247765A2
Cited
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