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Catalysts for polyimide foams from aromatic isocyanates and aromatic dianhydrides
Catalysts for polyimide foams from aromatic isocyanates and aromatic dianhydrides
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机译:芳族异氰酸酯和芳族二酐的聚酰亚胺泡沫催化剂
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摘要
Polyimide foam products having greatly improved burn-through and flame- spread resistance are prepared by the reaction of aromatic polyisocyanates with aromatic dianhydrides in the presence of metallic salts of octoic acid. The salts, for example stannous octoate, ferric octoate and aluminum octoate, favor the formation of imide linkages at the expense of other possible reactions.
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