Lignin based polyols

Details Lignin based polyols Lignin based polyols

C - Chemistry, Metallurgy

08

L

C08L 97/00 (2006.01) C08L 75/06 (2006.01) C08L 75/08 (2006.01) C08J 9/00 (2006.01)

Patent

CA 2214013

Certain lignins which are readily available from pulping processes function as a polyol component of an isocyanate system to make foams and urethane plastics. Use of the lignin in this manner provides moisture and flame resistance and produces products having sufficient rigidity. The sodium level must be controlled so that the reaction between the hydroxyl groups and the isocyanates produces products with the optimal properties.

Certaines lignines qui sont facilement accessibles à partir des procédés de cuisson de la pâte à papier peuvent servir comme un constituant polyolique dans un système isocyanate pour fabriquer des mousses et des plastiques à base d'uréthane. L'utilisation de la lignine de cette façon confère une résistance à l'humidité et un caractère ininflammable et donne des produits ayant une rigidité suffisante. La concentration de sodium doit être contrôlée de manière que la réaction entre les groupes hydroxyle et les isocyanates donne des produits ayant des propriétés optimales.

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