Process for the production of nonflammable laminated materials

Details Process for the production of nonflammable laminated materials Process for the production of nonflammable laminated materials

1975-06-04

1978-02-14

Van Horn, Charles E.

Stock material or miscellaneous articles

Composite

Of aldehyde or ketone condensation product

106 15FP, 156335, 252 81, 260 293, 427391, 427439, 428531, 428537, 428535, 428921, B32B 2710

Patent

active

040740153

ABSTRACT:
A process for producing nonflammable laminated materials which includes the steps of impregnating a cellulose-containing material with an impregnating solution containing a phenolic-resol resin solution, at least one plasticizer for the resin and optionally flameproofing agents, subsequently drying the impregnated material to effect preliminary condensation of the resin and thereafter curing superimposed layers of the impregnated and preliminary condensed material by the application of heat and pressure. The phenol-resol resin solution used contains 50-80% by weight of an ammonia alkaline-condensed phenol-resol resin with a solids content of 65-80% by weight and with a molecular weight distribution determined by gel chromatography of: dimers 20-26%; tri- and tetramers 6-12%; penta- and oligomers 24-36%; expressed in percent per unit area and hexamethylenetetramine in amounts of 1-15% by weight based on the weight of the impregnating solution.

REFERENCES:
patent: 2193941 (1940-03-01), Seebach
patent: 2801672 (1957-08-01), Baldwin et al.
patent: 2817386 (1957-12-01), Counos
patent: 2937159 (1960-05-01), McKay et al.
patent: 2941918 (1960-06-01), West et al.
patent: 2956037 (1960-10-01), Venable
patent: 3133034 (1964-05-01), St. Clair et al.
patent: 3377317 (1968-04-01), Hoxie
patent: 3715310 (1973-02-01), Butcher
patent: 3843575 (1974-10-01), Dijkstra
patent: 3922459 (1975-11-01), Franz et al.

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