Weatherable building materials

B - Operations – Transporting – 32 – B

Patent

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Details

B32B 21/02 (2006.01) B27N 1/00 (2006.01) B27N 3/00 (2006.01) B32B 21/08 (2006.01) B32B 27/42 (2006.01) C08L 97/02 (2006.01) D04H 1/64 (2006.01) C08L 61/06 (2006.01)

Patent

CA 2279852

Weatherable building products containing consolidated partially digested lignocellulosic fibers in admixture with a primary, in situ-generated binder, a secondary phenol/formaldehyde binder preferably of the novolac type, and a post press tertiary binder comprising a water repellant but water vapor transmissive impregnating coating. The building materials exhibit only minor thickness swelling when exposed to water, and in addition maintain a significant portion of their initial strength properties after environmental cycling. The products are suitable for use as exterior building materials, particularly entry door components such as door skins, jambs, thresholds, and the like.

La présente invention concerne des matériaux de construction résistant aux intempéries, contenant des fibres lignocellulosiques partiellement digérées, consolidées, mélangées avec un liant primaire, produit in situ, avec un second liant phénol/formaldéhyde, de préférence du type novolaque, et avec un liant tertiaire de finition, comprenant un revêtement d'imprégnation hydrofuge mais laissant passer la vapeur d'eau. Les matériaux de construction selon l'invention ne présentent qu'un faible gonflement en épaisseur lorsqu'ils sont exposés à l'eau et, en outre, conservent une partie importante de leurs propriétés de résistance initiale après avoir été soumis, selon un cycle, à des conditions climatiques extrêmes. Ces produits peuvent être utilisés en tant que matériaux de construction extérieurs, en particulier en tant que composants de portes d'entrée tels que parois extérieures de portes, montants de portes, seuils et analogues.

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