| 摘要 |
A composition having excellent water-repellent properties and stability in an emulsified state is provided. The composition contains a wax having a melting point of 50 DEG to 90 DEG C., a hydrocarbon resin, an alkali metal salt of a condensation product of beta -naphthalene sulfonic acid with formalin and an alkali salt of polyacrylic acid. These components are emulsified in water. The composition is especially useful as a waterproof agent fo gypsum boards and gypsum plaster.
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