Binder composition comprising condensed tannin and furfuryl...

Details Binder composition comprising condensed tannin and furfuryl... Binder composition comprising condensed tannin and furfuryl...

2007-05-01

2007-05-01

Brunsman, David M. (Department: 1755)

Compositions: coating or plastic

Coating or plastic compositions

Molds and mold coating compositions

C106S287200, C523S144000

Reexamination Certificate

active

10966342

ABSTRACT:
This invention relates to a binder composition comprising condensed tannin and furfuryl alcohol. The composition can be used to prepare foundry mixes. The foundry mixes are prepared by mixing the composition with an acid or salt of an acid. The foundry mixes are then shaped into molds or cores and cured by heating or by the no-bake process with stronger acid curing catalysts. The molds and cores are used in casting metal articles.

REFERENCES:
patent: 3513001 (1970-05-01), Worthington et al.
patent: 4357194 (1982-11-01), Stofko
patent: 5238680 (1993-08-01), Connolly
patent: 6589460 (2003-07-01), Shen
patent: 2004/0115455 (2004-06-01), Quist et al.
Natural Tannin-Based Adhesives for Wood Composite Products of Low or No Formaldhyde Emission:, FAIR, http://www.biomatnet.org/secure/Fair/F340.htm, Jan. 1999.
“Industrial Hardboard and Other Panels Binder from Tannin/Furfuryl Alcohol in Absence of Formaldehyde”, A. Trosa et al.,Holz als Roh—und Werkstoff 56,213-214 (1998), no month provided.
“Condensed Tannins: Reactions of Model Compounds with Furfuryl Alcohol and Furfuraldehyde”, Foo et al.,Journal of Wood Chemistry and Technology,5(1), 135-158 (1985), no month provided.
“Industrial hardboard and other panels binder from tannin/furfuryl alcohol in absence of formaldehyde”, Brief Originals (Holz als Roh- und Werkstoff 56 (1998) 213-214.

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