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Process for the preparation of tough till tough-tenacious polyurethane foams with an increased open-cell content and reduced shrinkage
Process for the preparation of tough till tough-tenacious polyurethane foams with an increased open-cell content and reduced shrinkage
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机译:具有增加的开孔含量和减少的收缩性的制备坚韧至坚韧的聚氨酯泡沫的方法
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摘要
Method for the prepn. of tough PU foams with increased open cell content and reduced shrinkage comprises reacting: (a) (modified) organic polyisocyanates; with (b) at least one high mol. wt. cpd. contg. at least two reactive hydrogen atoms; and pt. (c) lower mol. wt. chain extending- and/or crosslinking agents, comprising at least one polyol recyclate prepd. by glycolysis of (polyurea-)polyurethanes using glycide ethers; in the presence of (d) catalysts; (e) opt. propellants; and (f) opt. auxiliary agents and/or additives. No special cell openers are used in the prepn. process. The foams prepd. by this method are also claimed.
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