Polyether-reinforced fiber-based materials

Details Polyether-reinforced fiber-based materials Polyether-reinforced fiber-based materials

B - Operations, Transporting

32

B

B32B 27/10 (2006.01) D21H 17/52 (2006.01) D21H 17/53 (2006.01) D21H 25/06 (2006.01) D21H 27/30 (2006.01)

Patent

CA 2131893

Polyether-reinforced fiber-based materials, and methods for their manufacture, are disclosed. A representative material is a sheetlike ply having on one or both faces thereof a polyether-impregnated stratum extending depthwise into the ply thickness di- mension no greater than about one-half the ply thickness dimension so as to leave a portion of the ply thickness dimension unim- pregnated with polyether. The materials can comprise plural superposed plies wherein at least one ply has at least one polyether- impregnated stratum, such as polyether-reinforced corrugated paperboard. The polyether-reinforced materials have excellent compression strength and foldability. Each polyether-reinforced stratum is made by controllably applying a low-viscosity liquid mixture of an epoxy resin and a hardener, wherein the epoxy resin is substantially non-prepolymerized, to a fibrous web surface, then curing the resin mixture. The polyether-reinforced materials can be folded after curing and are useful for making cartons and other products.

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