Stock material or miscellaneous articles – Three dimension imitation or 'treated' natural product
Patent
1997-02-13
1999-07-13
Le, Hoa T.
Stock material or miscellaneous articles
Three dimension imitation or 'treated' natural product
1061627, 428402, 428407, 428511, 428512, 4285371, 530207, 530215, 530217, B32B 516, C08L 110, C09F 104
Patent
active
059224207
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to the field of chemically modified wood or some other cellulose-containing material, and more specifically to chemically modified pieces or particles which are possible to hot press or hot form in some other fashion into articles of different form, completely without using the formaldehyde adhesives which are much discussed these days. Apart from the pieces or particles being modified in such a manner as to permit said pressing or forming, they have also been found to be so stable that they can be stored and/or transported for a long time and then be hot formed or hot pressed into the desired article by the final user, i.e. quite independently of the factory in which the modified pieces or particles have been prepared. Therefore these particles will below be called a wood granulate since basically they are the equivalent of today's plastics granulates of different kinds, which are used for compression molding of plastic components. This leads to completely new fields of application for wood products.
The invention also relates to a method for preparing these granulates, and a method for manufacturing formed articles by hot pressing or hot forming of the granulates at issue.
BACKGROUND OF THE INVENTION
The prior-art technique for manufacturing kitchen fittings and, to some extent, also furniture products is to a considerable extent based on the use of particle board. The particle board products have appeared to be competitive by the relatively low price and suitability of the material for constructing geometrically simple configurations.
However, there are drawbacks of technical rather than economic nature, which in some cases are very annoying. The liberty in designing is highly restricted by the standard particle boards being made planar only and in large dimensions, which during manufacture are made into components which are planar as well. Besides, the particle board is brittle during drilling and edge processing, and instead of gluing, a special mechanical technique must be used for joining. Moreover, the dimensional stability and the resistance to moisture are unsatisfactory. Recently, the attention paid to the content of formaldehyde in the adhesive used in the particle board has pointed to the shortcoming of the particle board when requiring increased consideration of the environment and harmony with the ever increasing preference of the market for ecologically adapted products.
A substitute for particle boards which would permit that constructions, kitchen fittings and other interior fittings could be manufactured while taking greater liberty in aesthetical and designing respects, could be manufactured in a simpler way and at lower cost than the present technique and could be environmentally adapted to the market's wishes if full freedom from formaldehyde and other environmentally questionable chemicals would be of great interest to the industry manufacturing wooden articles.
Also for the construction and manufacture of dimensionally and moisture stable building products, fittings in cars and other vehicles, appliance enclosures, returnable packages etc., an ecological cellulose-based material permitting simple compression molding would be of interest to the market and be correct in these days.
The new chemically modified cellulose-based product according to the present invention has surprisingly been found to render the above possible. This is achieved by a specific combination of esterification of the hydroxy groups included in the material with a dicarboxylic acid anhydride, and treatment with a polyol, wherein the choice of the used reactants and especially their mutual quantities and how the chemical modification is carried out have been found to result in a product having good physical and chemical properties, which, as stated above, in many respects can be resembled to a plastics granulate in the respect that the inventive product functions as an intermediate product which is stable in storage and which can be formed by the final user
REFERENCES:
patent: 4376187 (1983-03-01), Theodore et al.
patent: 4394486 (1983-07-01), Chattha et al.
patent: 5055247 (1991-10-01), Ueda et al.
"Chemical Treatment of Wood With a Maleic Acid and Glycerol Mixture", International Symposium on Chemical Modification of Wood, H. Fujimoto et al., May 17-18, 1991, Kyoto, Japan, pp. 83-91.
Dialog Information Services, File 240, Paperchem, Dialog Accession No. 445326, Paperchem No. 59-05326, Matsuda, H. et al., "Preparation and Crosslinking of Oligoesterified Woods Based on Maleic Anhydride and Ally Glycidyl Ether", Wood Science Technol. (NY) 22, No. 1: 21-32 (1988).
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Patent Abstracts of Japan, vol. 9, No. 194, M-403, Abstract of Japanese Publication No. 60-58802, "Preparation of a Modified Wood Piece", Inventors: Minoru Ueda et al., Applicant: Okura Kogyo Kabushiki Kaisha, Published: Apr. 5, 1985.
Dialog Information Services, File 351, Derwent WPI, Dialog Accession NO. 004323555, WPI Accession No. 85-150433/25, Okura Industrial KK: "Modified Wood Pieces Prepn. by Addn. Esterification of Wood Pieces to Obtain Carboxyl Gp. Contg. Esterified Wood Pieces", & JP 60083806, 850513, 8525 (Basic) and Patent Abstracts of Japan, vol. 9, No. 266, (M-412) Abstracts of Japan 60-83806, publ. May 13, 1985. Inventors: Minoru Ueda et al.
Dahlin Jorgen
Nyberg Ulf
Le Hoa T.
Stora Kopparbergs Bergslags AB
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