Coating processes – Coating by vapor – gas – or smoke – Wood base
Patent
1993-04-20
1994-06-07
Beck, Shrive
Coating processes
Coating by vapor, gas, or smoke
Wood base
427397, 427341, 427342, 427351, 427393, 427440, B05D 706
Patent
active
053188020
ABSTRACT:
In a method of treating a raw wood material with a formaldehyde polymer in the presence of sulfur dioxide at a reaction temperature within a reaction vessel to obtain a modified wood material, sulfur dioxide is supplied into the reaction vessel when a gas pressure of the formaldehyde polymer within the reaction vessel is 4.00.times.10.sup.4 Pa or more. In addition, a concentration of the formaldehyde polymer is in a range of 30 to 350 mol/m.sup.3 of formaldehyde monomer, and a molar ratio of the formaldehyde polymer to sulfur dioxide is in a range of 10 to 350. As the formaldehyde polymer, for example, trioxane, tetraoxane, or paraformaldehyde is used. The modified wood material manufactured by the method including the above conditions shows excellent dimensional stability while a discoloration thereof is effectively prevented. Therefore, the modified wood material is particularly fit to use for an interior furniture, musical instrument and a bath tub, etc.
REFERENCES:
patent: 2870041 (1959-01-01), Waddle et al.
patent: 3524763 (1970-08-01), Tarauella et al.
Adachi Arihiro
Ishikawa Hiroyuki
Usui Hiroaki
Beck Shrive
Matsushita Electric & Works Ltd.
Talbot Brain K.
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