Adhesive compositions comprising type-II cellulose
Inventors
Capanema, Ewellyn A. • BALAKSHIN, Mikhail Y.
Assignees
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Publication Number
US-10793646-B2
Publication Date
2020-10-06
Expiration Date
Abstract
Admixtures comprising an adhesive resin and cellulose are disclosed, in which at least a portion of the cellulose is type-II cellulose. Also disclosed are compositions comprising adhesive resins, in which the adhesive resins comprise a condensation product of formaldehyde and at least one phenolic compound, and the condensation product is formed in the presence of cellulose, wherein at least a portion of the cellulose is type-II cellulose. Articles of manufacture containing the admixtures and compositions, such as plywood and oriented strand board, are also disclosed. In addition, methods of preparing the compositions and articles of manufacture are disclosed.
Core Innovation
The document describes a wood adhesive comprising an adhesive resin, cellulose, and lignin, where at least about 20 wt. % of the cellulose is type-II cellulose. It also describes an adhesive-resin composition in which a formaldehyde and at least one phenolic compound condensation product is formed in the presence of cellulose and lignin, with at least about 20 wt. % of the cellulose being type-II cellulose.
In these formulations, cellulose and lignin are provided as part of a cellulose/lignin-containing residue associated with biomass processing and are involved during formation and/or incorporation of the adhesive resin system. The disclosure emphasizes that the cellulose type and its loading relative to the total composition, together with the presence of lignin, define the adhesive formulation.
The document characterizes cellulose structure and type-II content using XRD and solid-state 13C CP-MAS NMR, and it defines different residue preparations from lignocellulosic biomass processed under described hydrothermal or supercritical hydrolysis pathways to obtain lignin-and-cellulose-containing residues. It further describes quantitative composition constraints and relates these constraints to adhesive performance measures reported in the examples.
Claims Coverage
The independent claims are clm-00001, clm-00005, clm-00015, and clm-00016, and each centers on inventive features tied to type-II cellulose content thresholds, inclusion of lignin and/or the presence and formation context of a formaldehyde/phenolic condensation product, and formulation scope.
Wood adhesive with adhesive resin, cellulose, and lignin using type-II cellulose
A wood adhesive comprising an adhesive resin; cellulose; wherein at least about 20 wt. % of the cellulose is type-II cellulose; and further comprising lignin.
Formaldehyde/phenolic condensation product formed in presence of cellulose and lignin with type-II cellulose
A composition comprising an adhesive resin, wherein the adhesive resin comprises a condensation product of formaldehyde and at least one phenolic compound, wherein the condensation product is formed in the presence of cellulose and lignin, wherein at least about 20 wt. % of the cellulose is type-II cellulose.
Wood adhesive with defined cellulose loading and at least about 20 wt. % type-II cellulose
A wood adhesive comprising an adhesive resin; and cellulose; wherein at least about 20 wt. % of the cellulose is type-II cellulose; and wherein the cellulose is present in an amount of about 5 wt. % to about 50 wt. % of the total composition, on a dry basis.
Cured wood panel using a cured wood adhesive with type-II cellulose
Plywood or oriented strand wood comprising a cured wood adhesive comprising an adhesive resin; and cellulose; wherein at least about 20 wt. % of the cellulose is type-II cellulose.
Across the independent claims, the central claim coverage is directed to adhesive formulations in which type-II cellulose is present at a threshold level and, depending on the claim, lignin is included and/or a formaldehyde and phenolic condensation product is formed in the presence of cellulose and lignin. Additional coverage constrains the cellulose amount on a dry basis and extends the composition to plywood or oriented strand wood incorporating the cured adhesive.
Stated Advantages
Not explicitly described in patent.
Documented Applications
Not explicitly described in patent.
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