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In addition, manufacturing costs increase not only due to physical loss of wax from the lignocellulosic composite article (e.g., up to 50% by weight), but also due to cleaning, safety and administrative costs of maintaining the manufacturing plant and surroundings used to make the lignocellulosic composite article
Method used
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[0042] Other graft polyols suitable for the purposes of the present invention and methods for their preparation include those described in the following U.S. Patents: 4,522,976 to Grace et al; 5,093,412 to Mente et al; 5,179,131 to Wujcik et al; 5,594,066 of Kratz et al. 5,814,699 of Kratz et al. 6,034,146 of Falke et al. 6,103,140 of Falke et al. 6,352,658 of Chang et al. 6,432,543 of Harrison et al. 7,179,882, the disclosure of which is incorporated herein by reference in its entirety.
[0043] Specific examples of graft polyols suitable for the purposes of the present invention are available under the trademark PLURACOL Commercially available from BASF Corporation of Florham Park, NJ as PLURACOL 1365. PLURACOL 4600、PLURACOL 4650、PLURACOL 4800、PLURACOL 4815、PLURACOL 4830 and PLURACOL 4850 grafted polyol. It will be appreciated that the processing aid may comprise any combination of the graft polyols described above. Detailed information on graft polyo...
Embodiment
[0076]Examples of producing wood fiber composite products, specifically, one comparative example (comparative example) and three examples of the invention (invention examples 1 to 3) were prepared. The lignocellulosic composite article formed below is particle board. The examples were prepared using a preparation method normally used for the preparation of particle board (PB) such that the preparation method did not impart a difference to the examples. The amounts and types of the various components used to form the lignocellulosic products are indicated in Table I below, with all values in parts by weight based on 100 parts by weight of all components.
[0077] Table I
[0078]
[0079] The isocyanate component was polymeric MDI having a functionality of about 2.7, an NCO content of about 31.5 wt%, and a viscosity of about 200 cps at 25°C, commercially available from BASF Corporation of Florham Park, NJ.
[0080] Processing Aid 1 is a secondary hydroxyl terminated graf...
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Abstract
A lignocellulosic product comprises a plurality of lignocellulosic pieces, and an isocyanate component and a processing aid disposed on the pieces. The processing aid is reactive with the isocyanate component, comprises a graft polyol having a continuous and discontinuous phase, and can be used to form a lignocellulosic composite article. The processing aid is useful for imparting the composite article with moisture resistance, swelling resistance, and toughness, as well as providing cold-tack during manufacture of the composite article from the product. The continuous phase comprises an isocyanate-reactive component. The discontinuous phase comprises polymeric particles. The isocyanate component and the processing aid are present in the product a combined amount of from about (1) to about (25) parts by weight based on (100) parts by weight of the product. The composite article can be various engineered lignocellulosic composites, such as oriented strand board (OSB), particleboard (PB), scrimber, or fiberboard.
Description
technical field [0001] The present invention relates generally to lignocellulosic products, and in particular, the present invention relates to lignocellulosic products comprising a plurality of lignocellulosic sheets, an isocyanate component and a processing aid, and to lignocellulosic fibers formed from said lignocellulosic products Composite articles, and methods of forming said lignocellulosic products and lignocellulosic composite articles. Background technique [0002] Wood fiber composite products - such as oriented strand board (OSB), oriented laminated lumber (OSL), particle board (PB), recombined board (scrimber), agricultural fiberboard (agrifiber board), chipboard (chipboard), compressed board ( flakeboard), and fiberboards such as medium density fiberboard (MDF)—generally prepared by mixing or spraying lignocellulosic sheets with a binder composition, such as a resin, while tumbling or agitating the lignocellulosic sheets in a blender or similar device. After t...
Claims
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