Foamed and cross-linked phenolic resin and method for making same
AssigneeTransdiffusia S.A.
InventorsRoger Lamartine, Philippe Choquard
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Abstract
A phenolic foam having exceptional absorption capacities for pollutants such as hydrocarbons and other substances is described. The foam is hydrophobic and is capable of absorbing such substances in amounts up to 72 times its own weight. It is the reaction product of a resol and a cross-linking agent made of linear and/or cyclic, partially or completely sulphonated, phenolic oligomers, in the presence a surfactant and a swelling agent, and, optionally, of a coloring agent and stabilizers. A method for making the foam, an installation for implementing the method and a use of said foam are also described.
Claims12
Cellular foam on the base of a phenol-formol resin, characterized in that it is constituted of a phenol formol resol cross-linked by means of a cross-linking agent selected from completely or partially sulfonated linear and cyclic phenolic oligomers, optionally containing sulfonated phenol, the foam containing a surface active agent and optionally a stabilizer, and in that the foam has a hydrophobic nature permitting its use for absorbing, retaining and transporting oleophilic fatty liquids.
Dependencies are inferred from the claim text.