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AssigneeAkzo N.V.
InventorsStephanus Willemsen, Willem E. Weening, Anne Steenbergen
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A multifilament yarn of an aromatic polyamide, in particular poly-p-phenylene terephthalamide, is provided with an adhesive coating of a cured epoxy compound, the yarn having a free epoxide content not higher than 10 mmoles/kg. The yarn is made by spinning a solution of an aromatic polyamide into a coagulation bath and subjecting the resulting filaments to the subsequent steps of washing, applying a curable epoxy compound and one or more alkaline curing agents, curing and winding the yarn thus treated into a package. The resulting yarn can be processed into a reinforcing element for, e.g., tires in a one-step dipping process. A cord made from the yarn displays an improved resorcinol-formaldehyde-latex dip pickup.
A multifilament yarn which consists of an aromatic polyamide and is provided with an adhesive coating of a cured epoxy compound, characterized in that the yarn has a free epoxide content not higher than 10 mmoles/kg, the epoxide compound having been applied to the yarn and cured while the yarn has a twist of fewer than 10 turns per meter.
A yarn package, characterized in that it contains a continuous yarn length of a multifilament yarn consisting of poly-p-phenylene terephthalamide, which yarn has a twist of fewer than 10 turns per meter, provided with an adhesive coating of a cured epoxy compound and has a free epoxide content of less than 2 mmoles/kg.
Dependencies are inferred from the claim text.