Process for producing rubber-reinforcing aromatic polyamide multifilament yarn
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United States of America Patent
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Sep 21, 1993
Grant Date -
N/A
app pub date -
Aug 27, 1992
filing date -
Sep 5, 1991
priority date (Note) -
Expired
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Abstract
An aromatic polyamide multifilament yarn having a high bonding property to a rubber material and a high resistance to fraying of individual filaments, is produced by impregnating an aromatic polyamide multifilament yarn with a treating liquid comprising a first liquid rubber component (A) comprising at least one rubber compound provided with terminal hydroxyl or epoxy groups and having a molecular weight of 500 to 10,000, a second liquid rubber component (B) comprising at least one rubber compound provided with terminal isocyanate groups and having a molecular weight of 500 to 10,000, and an additive selected from antioxidants, antiaging agents, and epoxy compounds; heat treating the impregnated multifilament yarn at 100.degree. to 260.degree. C. for 30 to 260 seconds; twisting the heat treated multifilament yarn at a twist coefficient K satisfying the relationship (I): 1.ltoreq.K.ltoreq.5 (I) wherein K is defined by the equation (II): K=(T.times.D.sup.1/2)/2874 (II) T=twist number/m and D=denier of the multifilament yarn; applying an adhesive agent containing a resorcinol-formaldehyde resin and a rubber latex, to the twisted multifilament yarn and curing the adhesive agent on the multifilament yarn.
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