| abstract |
This invention is directed to a structural core comprising a fibrous web and a matrix resin, the matrix resin comprising from 15 to 75 weight percent of the weight of web plus resin, the matrix resin contains a first resin comprising tannin in an amount of 10 to 100 weight percent and a second resin in the event tannin is not present in an amount of 100 weight percent, A preferred second resin is phenolic, benzoxazine, polyester, cyanate ester, bismaleimide, epoxy, polyimide or combination thereof. |