| 摘要 |
PCT No. PCT/EP96/01670 Sec. 371 Date Oct. 27, 1997 Sec. 102(e) Date Oct. 27, 1997 PCT Filed Apr. 22, 1996 PCT Pub. No. WO96/35019 PCT Pub. Date Nov. 7, 1996Process for the production of structurally strong papers (or paper-like materials) which have a terminable strength by treatment of paper in the pulp or of finished paper in the surface with 0.0001 to 50% by weight, preferably 0.01-25% by weight (based on the pulp), of a mixture of isocyanates which contain on average at least two isocyanate groups and of which at least 20% by weight (preferably at least 50%) are those in which the NCO groups are bonded via an organic radical which contains at least one ester and/or amide group in the main chain.
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