| 摘要 |
A two component system, and method for its preparation, from which a phenol-formaldehyde resin foam may be prepared, which system comprises in a first component a phenol-formaldehyde resin, a blowing agent which is an inert, low boiling liquid, an effective amount of a nitrogenous modifier capable of permitting dispersion of the blowing agent in the resin, and a surfactant; and in a second component an acid catalyst system dispersed in a liquid polyhydroxy compound, in a weight ratio of acid catalyst to polyhydroxy compound of at least 1:1. These systems enable simpler handling and placement techniques being shelf storable, compared to the known shelf storable systems which involve three, or more, components.
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