| 摘要 |
A glass fiber sizing agent comprising, as a sizing component, an oil-in-water emulsion of a saturated polyester which is formed by emulsifying in water, a saturated polyester obtained by reacting, under heating, (a) an aromatic or saturated aliphatic dicarboxylic acid or lower alkyl ester thereof, (b) a diol component containing at least 40 mole %, based on the total diol component, of an adduct of 2 to 10 moles of an alkylene oxide to 2,2-bis(4-hydroxyphenyl)propane, and (c) 5 to 30 parts by weight, per 100 parts by weight of the sum of the starting components (a) and (b), of an emulsifier selected from the group consisting of an adduct of 10 to 200 moles of ethylene oxide to castor oil, an adduct of 10 to 200 moles of ethylene oxide to hardened castor oil and a polyethylene glycol having an average molecular weight of 1000 to 6000.
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