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US 5,703,144 AGranted
Solid furan binders for composite articles
AssigneeQO Chemicals, Inc.
InventorDenis W. Akerberg
Life of this patent
Estimating the term…
Abstract
Furfuryl alcohol-formaldehyde resins in solid form.
Claims24
A solid dry resin composition heat curable to a rigid set condition comprising the reaction product of formaldehyde with furfuryl alcohol in a molar ratio of at least 2:1, the composition containing not more than 10% by weight of water insoluble material and not more than about 5% by weight of furfuryl alcohol.
A process for producing a bound composition article which comprises:
- a. impregnating a porous substrate material with a liquid resin comprising the reaction product of formaldehyde with furfuryl alcohol in a molar ratio of at least 2:1, the resin containing not more than 10% by weight of water insoluble material and not more than about 5% by weight of furfuryl alcohol,
- b. removing water from the impregnated material to obtain a solid dry resin, and
- c. curing the resin in the impregnated material to a set condition.
A process for producing a solid dry resin composition heat curable to a set condition which comprises:
- a. reacting in the presence of a weak organic acid having a pKa of not less than about 4 at an elevated temperature formaldehyde with furfuryl alcohol in a molar ratio of at least about 2:1,
- b. recovering the liquid resin reaction product, the liquid resin reaction product containing not more than 10% by weight of water insoluble material,
- c. removing water from the liquid resin reaction product, and
- d. recovering the solid dry reaction product.
1 more element
Dependencies are inferred from the claim text.