Process for producing structurally resistant paper
AssigneeBayer Aktiengesellschaft
InventorsHarro Traubel, Klaus Konig
Life of this patent
Estimating the term…
Abstract
Process 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.
Claims5
Process for the production of structurally strong papers having a terminable strength comprising, adding to a papermaking pulp or to the surface of a finished paper 0.0001 to 50% 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 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.
Dependencies are inferred from the claim text.