Mixed tannin-phenolic foams
AssigneeE. I. Du Pont de Nemours and Company
InventorsMichael W Cobb, Mark Andrew Harmer, Vivek Kapur, Ann Y Liauw, Sharlene Renee Williams
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Abstract
Disclosed are foam compositions and processes to form mixed tannin-phenolic foams. The foams comprises a continuous polymeric phase defining a plurality of cells, wherein the continuous polymeric phase comprises a mixed-resin derived from a phenol, a tannin, and a first monomer, and wherein the plurality of cells comprises a plurality of open-cells and a plurality of closed-cells with an open-cell content measured according to ASTM D6226-5, of less than 50%. The foam composition also comprises a discontinuous phase disposed in at least a portion of the plurality of closed-cells, the discontinuous phase comprising one or more blowing agents.
Claims15
A foam comprising:
- (a) a continuous polymeric phase defining a plurality of cells, wherein:
- the continuous polymeric phase comprises a mixed-resin derived from a tannin, furfuryl alcohol, and a phenolic resole, wherein the phenolic resole is derived from a phenol and one or more of formaldehyde, paraformaldehyde, furfural, glyoxal, acetaldehyde, 5-hydroxymethylfurfural, 5-furandicarboxylic aldehyde, and difurfural (DFF) as a first monomer, and
- the plurality of cells comprises a plurality of open-cells and a plurality of closed-cells with an open-cell content measured according to ASTM D2856, of less than 50%;
- and
- b) one or more blowing agents disposed in at least a portion of the plurality of closed-cells.
Dependencies are inferred from the claim text.