Claims
- 1. A method of sizing carbon fibers comprising coating carbon fibers with a sizing agent comprising a compound of formula (I): ##STR8## wherein R is --OH or ##STR9## n is 10 to 50.
- 2. The method of sizing carbon fibers as claimed in claim 1, wherein the compound of formula (I) is mixed with an epoxy resin comprising a bisphenol A type diglycidyl ether.
- 3. The method of sizing carbon fibers as claimed in claim 2, wherein said epoxy resin has a viscosity of 10 to 1,000 poises at 25.degree. C.
- 4. The method of sizing carbon fibers as claimed in claim 3, wherein the weight ratio of said epoxy resin to the compound of formula (I) is not greater than 1.
- 5. The method of sizing carbon fibers as claimed in claim 4, wherein the size is used as an aqueous system wherein the size is either dissolved or dispersed in water.
- 6. The method of sizing carbon fibers as claimed in claim 5, wherein the aqueous system of the size transmits at least 10% of light having a wavelength of 560 to 570 nm.
- 7. A carbon fiber composition comprising carbon fibers coated with a sizing agent comprising a compound of formula (I): ##STR10## wherein R is --OH or ##STR11## n is 10 to 50, wherein the amount of said sizing agent coated on said carbon fibers is 0.1 to 5.0 wt %.
Priority Claims (1)
Number |
Date |
Country |
Kind |
59-98236 |
May 1984 |
JPX |
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Parent Case Info
This is a continuation of application Ser. No. 734,645, filed May 16, 1985.
US Referenced Citations (6)
Continuations (1)
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Number |
Date |
Country |
Parent |
734645 |
May 1985 |
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