Abstract: Provided is an adhesive that effectively utilizes bark and demonstrates superior adhesion performance. The adhesive of the present invention comprises at least one adhesive resin (A) selected from the group consisting of phenolic resin, urea resin, and melamine resin, and finely pulverized bark (B) comprising cellulose nanofibers.

Abstract: Provided is an adhesive using bark, which is advantageous not only in that the proportion of the bark is increased so as to effectively utilize the bark, and the proportion of the phenolic resin is reduced to lower the adhesive solids content, but also in that the composition of the adhesive is simple. An adhesive using bark, which comprises a resol type phenolic resin and a radiata pine bark powder, wherein the adhesive contains 30 to 40 parts by mass of the radiata pine bark powder, relative to 100 parts by mass of the total of the resol type phenolic resin solids and the radiata pine bark powder.

Abstract: Provided is an adhesive that effectively utilizes bark and demonstrates superior adhesion performance. The adhesive of the present invention comprises at least one adhesive resin (A) selected from the group consisting of phenolic resin, urea resin, and melamine resin, and finely pulverized bark (B) comprising cellulose nanofibers.

Abstract: Provided is an adhesive using bark, which is advantageous not only in that the proportion of the bark is increased so as to effectively utilize the bark, and the proportion of the phenolic resin is reduced to lower the adhesive solids content, but also in that the composition of the adhesive is simple. An adhesive using bark, which comprises a resol type phenolic resin and a radiata pine bark powder, wherein the adhesive contains 30 to 40 parts by mass of the radiata pine bark powder, relative to 100 parts by mass of the total of the resol type phenolic resin solids and the radiata pine bark powder.

Abstract: A method of producing powder with a high tannin content includes pulverizing a tannin-containing plant such as bark of radiata pine (Pinus radiata) and classifying the pulverized material into fine particles having a desired particle size, for example, fine particles having a particle diameter of 100 to 1,000 ?m or less. A powder with a high tannin content is produced by such a method. The thus obtained powder with a high tannin content exhibits excellent characteristics when used as an adhesive, a binder, etc. for wood materials.

Abstract: A method of producing powder with a high tannin content includes pulverizing a tannin-containing plant such as bark of radiata pine (Pinus radiata) and classifying the pulverized material into fine particles having a desired particle size, for example, fine particles having a particle diameter of 100 to 1,000 ?m or less. A powder with a high tannin content is produced by such a method. The thus obtained powder with a high tannin content exhibits excellent characteristics when used as an adhesive, a binder, etc. for wood materials.

Abstract: Method for obtaining tannin by extracting plant resources with mangrove, acacia, pine, eucalyptus, oak, hemlock and the like with lower alcohol or lower alcohol/water, or extracting outer bark of radiata pine (Pinus radiata) with water, lower alcohol or lower alcohol/water, and an adhesive containing said extracted substance for adhering woody materials such as veneer.

Abstract: The present invention provides a method of producing powder with a high tannin content, the method including pulverizing a tannin-containing plant such as bark of radiata pine (Pinus radiata) and classifying the pulverized material into fine particles having a desired particle size, for example, fine particles having a particle diameter of 100 to 1,000 &mgr;m or less, and powder with a high tannin content produced by such a method.

Abstract: Method for obtaining tannin by extracting plant resources with mangrove, acacia, pine, eucalyptus, oak, hemlock and the like with lower alcohol or lower alcohol/water, or extracting outer bark of radiata pine (Pinus radiata) with water, lower alcohol or lower alcohol/water, and an adhesive containing said extracted substance for adhering woody materials such as veneer.

Abstract: Adhesive compositions comprising an aqueous based adhesive and one or more hydrophilic hydrocarbon surfactant(s) or fluorochemical surfactants and methods for bonding porous materials are described which are particularly suitable for bonding high density and/or high moisture content woods. Methods for bonding timber veneer and improving bond cure rates are also disclosed.

Abstract: A method for producing a relatively low viscosity tannin extract from bark and/or wood and suitable for use in formaldehyde-condensation adhesives comprises providing tannin extract obtained from bark and/or wood, separating from the tannin extract the high molecular weight material, subjecting the high molecular weight material to treatment with one or more sulphite compounds to reduce the molecular weight and recombining the sulphited material with the tannin extract. The tannin extract may be recovered by subjecting bark and/or wood to a first stage hot aqueous tannin extraction process, thereby obtaining a first stage tannin extract, subjecting the extracted bark and/or wood to a second stage hot aqueous extraction process at a higher pH than the first stage, thereby obtaining a second stage tannin extract, and optionally recombining the first and second stage tannin extracts.

Abstract: A wood adhesive composition including an effective amount of a phenol-formaldehyde resin; and a modifying agent which agent renders the composition capable of bonding to a hard wood.