| 摘要 |
PURPOSE:To prepare glass fiber having alkali resistance, by using a sizing agent for glass fiber containing a specific improver for alkali resistance as an essential component of the sizing agent. CONSTITUTION:A sizing agent containing at least one improver for alkali resistance shown by the formula as an essential component. In the formula, R is H, or methyl group; X is Y, alkali metal, NH4 or lower organic ammonium group; m is arbitrary integer; n is O, or arbitrary integer. Namely, the improver shown by the formula is a polymer of (meth)acrylate or its derivative. The polymer can be obtained by a well-known method such as radical polymerization from (meth)acrylate or its derivative. When X is other than H atom, H atom of carboxyl group of poly(meth)acrylate obtained by polymerization is replaced with an alkali metal, NH4 or lower organic ammonium group.
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