| 摘要 |
<p>A heat-resistant phenolic resin foam contains a hydrate of an inorganic compound which generates a water vapor at a temperature below the decomposition temperature of the phenolic resin foam. The hydrate is chosen such that a saturated aqueous solution thereof has a pH of not more than 8, e.g., MgSO<Sub>4</Sub>.4H<Sub>2</Sub>O, Na<Sub>2</Sub>SO<Sub>4</Sub>.10H<Sub>2</Sub>O, ZnSO<Sub>4</Sub>.7H<Sub>2</Sub>O, N-aAl(SO<Sub>4</Sub>)<Sub>2</Sub>.12H<Sub>2</Sub>O, Mg<Sub>3</Sub>(PO<Sub>4</Sub>)<Sub>2</Sub>.8H<Sub>2</Sub>O, Al<Sub>2</Sub>.9SiO<Sub>2</Sub>.13H<Sub>2</Sub>O, KAl(SO<Sub>4</Sub>)<Sub>2</Sub>.12H<Sub>2</Sub>O and Al<Sub>2</Sub>(SO<Sub>4</Sub>)<Sub>3</Sub>.14-18H<Sub>2</Sub>O; and is contained in the foam in an amount of 2 to 30% by weight.</p> |
