Abstract:
This invention discloses adhesive compositions useful for providing cohesive strength to particles, for example a mat of wood particles produced while making particleboard prior to curing. The adhesive compositions has a) one or more biopolymers and b) one or more monomers or oligomers. An oligomer may have a degree of polymerization of 4 or less. The weight ratio of the monomer/oligomer to the biopolymer is optionally between 30:70 and 80:20. Optionally, the adhesive compositions may be combined with an isocyanate. The adhesive composition may be used to make no added formaldehyde wood composites such as particleboard.
Abstract:
The invention relates to an application system for water-based adhesives to produce corrugated and laminated board products using less adhesive than traditionally possible. The water based colloidal adhesive is selected from the group consisting of biopolymer nanoparticles and formulations based thereon, polyvinyl acetate and formulations based thereon, polyvinyl alcohol blends and formulations based thereon, dextrins and formulations based thereon, polyacrylics and formulations based thereon, vinyl acetate-acrylic copolymers and formulations based thereon, ethylene-vinyl acetate copolymers and formulations based thereon, vinyl acetate-ethylene copolymers and formulations based thereon, and other adhesives of similar characteristics, and blends of any of the former.
Abstract:
The present invention provides novel biolatex conjugate compositions and methods of production and use thereof. The novel biolatex conjugate compositions comprise a biopolymer-additive complex (prepared by co-extruding a biopolymer feedstock, at least one performance-enhancing additive, and at least one plasticizer under shear forces) reacted with a crosslinking agent under shear forces. The biolatex conjugate compositions exhibit enhanced performance properties for coated paper, paperboard, and other applications using extremely low levels of performance-enhancing additives.
Abstract:
The invention relates to an application system for water-based adhesives to produce corrugated and laminated board products using less adhesive than traditionally possible. The water based colloidal adhesive is selected from the group consisting of biopolymer nanoparticles and formulations based thereon, polyvinyl acetate and formulations based thereon, polyvinyl alcohol blends and formulations based thereon, dextrins and formulations based thereon, polyacrylics and formulations based thereon, vinyl acetate-acrylic copolymers and formulations based thereon, ethylene-vinyl acetate copolymers and formulations based thereon, vinyl acetate-ethylene copolymers and formulations based thereon, and other adhesives of similar characteristics, and blends of any of the former.
Abstract:
The invention concerns a process for producing corrugated board, wherein a biopolymer latex adhesive is used as the corrugating adhesive. The biopolymer latex adhesive can be obtained by extruding a plasticized biopolymer, especially starch, in the presence of a crosslinking agent such as glyoxal. The preparation of the latex adhesive and its application in corrugating operation do not require a gelatinization step, nor the use of caustic soda or borax.
Abstract:
A process for producing a biopolymer nanoparticles product is disclosed. In this process, biopolymer feedstock and a plasticizer are fed to a feed zone of an extruder having a screw configuration in which the feedstock is process using shear forces in the extruder, and a crosslinking agent is added to the extruder downstream of the feed zone. The biopolymer feedstock and plasticizer are preferably added separately to the feed zone. The screw configuration may include two or more steam seal sections. Shear forces in a first section of the extruder may be greater than shear forces in an adjacent second section of the extruder downstream of the first section. In a post reaction section located after a point in which the crosslinking reaction has been completed, water may be added to improve die performance.
Abstract:
A binder comprising isocyanate droplets in water, wherein the isocyanate droplets have an average droplet size of 500 microns or less, and the isocyanate droplets have shells comprising a biopolymer or a reaction product of a biopolymer and isocyanate. The biopolymer may be a biopolymer nanoparticle or cooked and chemically modified starch. Optionally, the binder may also include urea. The substrate for the binder may be wood, another lignocellulosic material, or synthetic or natural fibers. In particular examples, the binder is used to make no added formaldehyde wood composites including particle board and MDF.
Abstract:
Environmentally friendly biopolymer adhesives are described, wherein the adhesives comprise biopolymer particles, more preferably starch microparticles, and most preferably starch nanoparticles, and their aqueous dispersions. Applications for the biopolymer particle adhesives are described, that are environmentally friendly alternatives to petroleum based synthetic adhesives. The biopolymer particle adhesives provide are biodegradable as well as repulpable, and thus provide bio-based recycling-friendly alternatives to synthetic adhesives derived from petroleum resources.
Abstract:
This specification relates to cold-set biobased adhesive compositions, comprising aqueous formulations of biopolymers, optionally with alkaline additives, optionally fortified with high-aspect-ratio inorganic and organic fillers, fibers and nanofibers, optionally with barrier-inducing additives. The adhesive may be used, for example, as a cold-set, preferably biobased, laminating adhesive. In particular, the laminating adhesive may be used to create liner and/or medium paperboard products for light-weight paperboard and corrugated boxboard materials that, in some examples, have enhanced strength and/or barrier properties as compared with similar weight paperboard products. These laminated paperboard and corrugated boxboard materials are used, for example, as light weight packaging materials that are compatible with paper recycling and composting operations. In the context of this abstract, the term "lamination" or "laminating" relates to the adhesion of two flat (rather than pre- corrugated) paper surfaces, i.e. the gluing together of two continuous sheets of paper or liner or medium paperboard.
Abstract:
This specification describes a composition for coating on a substrate, such as paper, useful for inkjet printing with ink having an anionic dye. The coating comprises a cationic binder and preferably pigment. The binder may be made of latex forming cationic biopolymer particles, for example made from cationic starch. Cationic biopolymer polymers are used as a cationic fixative. Optionally, a salt with a polyvalent metal ion may be added to the composition. With this addition, the substrate is also suitable for printing with dispersed pigment based inkjet ink.