EP0314157A2
Expired / Lapsed
EP
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Method of surface treating carbon fiber with a sizing agent
Assignee: JFE Steel Corp
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Filing: 1988-10-28
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Granted: —
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Expires: 2008-10-28
Abstract
Abstract This invention provides a sizing agent for carbon fiber which contains an isocyanate regenerating compound which is an isocyanate compound -NCO group of which is stabilized with a blocking agent. Further provided are carbon fiber improved in adhesion to resins and carbon fiber reinforced composite materials improved in various properties such as tensile strength, flexural strength and Izod impact strength.
Inventors
- 👤 Motoi Marumoto
- 👤 Yojiro Hara
- 👤 Tadanori Kitamura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 21:30
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/322; D06M13/395; D01; D01F; D01F11/00; D01F11/10; D01F11/14; D06M15/00; D06M15/19; D06M15/37; D06M15/564
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
27 words
A sizing agent for carbon fiber which contains an isocyanate regenerating compound which is an isocyanate compound -NCO group of which is stabilized with a blocking agent.
Claim 2
Dependent Claim
27 words
A sizing agent for carbon fiber which contains an isocyanate regenerating compound which is an isocyanate compound -NCO group of which is stabilized with a blocking agent.
Claim 3
Dependent Claim
29 words
A sizing agent according to claim 1 wherein weight ratio of solid matter of sizing agent other than the isocyanate regenerating compound/the isocyanate regenerating compound is 0/1 - 100/1.
Claim 4
Dependent Claim
25 words
A sizing agent according to claim 1 wherein the isocyanate compound is methylene diisocyanate, hexamethylene diisocyanate, tolylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate or dicyclohexylmethane diisocyanate.
Claim 5
Dependent Claim
23 words
A sizing agent according to claim 1 wherein the blocking agent is phenol, diethyl malonate, acetoacetate, acetylacetone, ε-caprolactam, methyl ethyl ketoxime or bis-4,4-ethyleneurea.
Claim 6
Dependent Claim
30 words
A sizing agent according to claim 2 wherein the sizing agent other than the isocyanate regenerating compound is epoxy resin, polyurethane resin, acrylic resin, polystyrene resin or vinyl acetate resin.
Claim 7
Independent Claim
51 words
A method for surface treatment of carbon fiber which comprises treating carbon fiber with a sizing agent containing an isocyanate regenerating compound which is an isocyanate compound -NCO group of which is stabilized with a blocking agent to allow the sizing agent to adhere to the surface of the carbon fiber.
Claim 8
Independent Claim
51 words
A method for surface treatment of carbon fiber which comprises treating carbon fiber with a sizing agent containing an isocyanate regenerating compound which is an isocyanate compound -NCO group of which is stabilized with a blocking agent to allow the sizing agent to adhere to the surface of the carbon fiber.
Claim 9
Dependent Claim
31 words
A method according to claim 6 wherein ratio of solid matter of sizing agent other than the isocyanate regenerating compound/the isocyanate regenerating compound in the sizing agent is 0/1 - 100/1.
Claim 10
Dependent Claim
24 words
A method according to claim 6 wherein the isocyanate compound is methylene diisocyanate, hexamethylene diisocyanate, tolylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate or dicyclohexylmethane diisocyanate.
Claim 11
Dependent Claim
22 words
A method according to claim 6 wherein the blocking agent is phenol, diethyl malonate, acetoacetate, acetylacetone, ε-caprolactam, methyl ethyl ketoxime or bis-4,4-ethyleneurea.
Claim 12
Dependent Claim
29 words
A method according to claim 7 wherein the sizing agent other than the isocyanate regenerating compound is epoxy resin, polyurethane resin, acrylic resin, polystyrene resin or vinyl acetate resin.
Claim 13
Dependent Claim
27 words
A method according to claim 6 wherein amount of sizing agent adhering to the surface of the carbon fiber is 0.01-20% by weight of the carbon fiber.
Claim 14
Dependent Claim
29 words
A method according to claim 6 wherein amount of the isocyanate regenerating compound adhering to the surface of the carbon fiber is 0.01-2.0% by weight of the carbon fiber.
Claim 15
Dependent Claim
26 words
A method according to claim 6 wherein the carbon fiber is in the form of chopped strand, continuous long fiber, woven fabric, mat, sheet or felt.
Claim 16
Dependent Claim
10 words
Carbon fiber treated with the sizing agent of claim 1.
Claim 17
Dependent Claim
15 words
A composite material which comprises a resin reinforced with the carbon fiber of claim 14.
Claim 18
Dependent Claim
17 words
A composite material according to claim 15 wherein the resin is polyphenylene sulfide resin or polyacetal resin.
References Cited (Backward Citations)
No citation records indexed.
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