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Polyvinyl alcohol cross-linked with two aldehydesA film forming polyvinyl alcohol resin is admixed, in aqueous solution, with a dialdehyde crosslinking agent which is capable of crosslinking the polyvinyl alcohol resin and a water soluble acid aldehyde containing a reactive aldehyde group capable of reacting with hydroxyl groups in the polyvinyl alcohol resin and an ionizable acid hydrogen atom. The dialdehyde is present in an amount sufficient to react with from 1 to 20% by weight of the theoretical amount required to react with all of the hydroxyl groups of the polyvinyl alcohol. The amount of acid aldehyde is from 1 to 50% by weight, same basis, and is sufficient to reduce the pH of the aqueous admixture to 5 or less. The admixture is then formed into a desired physical shape, such as by casting a sheet or film, and the shaped material is then heated to simultaneously dry and crosslink the article.
Document ID
19830004917
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Sheibley, D. W. (NASA Lewis Research Center Cleveland, OH, United States)
Rieker, L. L. (NASA Lewis Research Center Cleveland, OH, United States)
Hsu, L. C. (NASA Lewis Research Center Cleveland, OH, United States)
Manzo, M. A. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 4, 2013
Publication Date
November 2, 1982
Subject Category
Inorganic And Physical Chemistry
Accession Number
83N13188
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
NASA-CASE-LEW-13504-1|US-PATENT-4,357,402
Patent Application
US-PATENT-APPL-SN-272234

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