Oxazolidine-based hardeners for the room temperature cure of res

Details Oxazolidine-based hardeners for the room temperature cure of res Oxazolidine-based hardeners for the room temperature cure of res

1997-04-02

1999-01-12

Acquah, Samuel A.

Stock material or miscellaneous articles

Composite

Of aldehyde or ketone condensation product

528403, 528406, 528422, 525486, 525534, 525540, 428526, B32B 2742, C08F28300

Patent

active

058585532

ABSTRACT:
An improved oxazolidine-based hardener to be used with a resorcinol resin or a tannin resin as the adhesive for the bonding of wood articles. Preferably, an oxazolidine is combined with a base such as NaOH and a powdered absorbent such as wheat flour. The adhesive based on the improved hardener can be used to glue wood particles to pass wet strength requirements after the glue is cured at room temperature for under 24 hours. The improved hardener composition is storage stable; it can be prepared anytime before its use, thus eliminating the need to prepare a hardener immediately prior to the glue use. Since it is formaldehyde-free; it eliminates the safety issues associated with handling formaldehyde or paraformaldehyde. Also, the hardener provides flexible gel time or working time. Since the resins can be cured at room temperature, heating in an oven is not needed but could be used to reduce curing time. If radio frequencies are used to cure the resins, the exposure time can be reduced.

REFERENCES:
patent: 3600353 (1971-08-01), Baker
patent: 3705832 (1972-12-01), Stephan et al.
patent: 4034012 (1977-07-01), Gillern
patent: 4175065 (1979-11-01), Andersson
patent: 4373062 (1983-02-01), Brown
patent: 4942191 (1990-07-01), Rogers
patent: 5532330 (1996-07-01), Pizzi et al.
Herfindal, Larry, Radio Frequency Wood Gluing, HB Fuller Company, Aug. 1990 .

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