| 摘要 |
<p>A tire-reinforcing dip cord composed of nylon 6 and/or nylon 66 fiber is described. The dip cord has (1) a strength at break of at least 8.2 g/d, (2) an elongation of at least 18% under a load of 8 g/d, (3) a gradient not larger than 0.75 in the load-elongation curve immediately before break, and (4) a cord diameter variation ratio (D/Do) (D=cord diameter under a load of 450 g and Do=cord diameter under no load) not larger than 0.65. The dip cord is prepared by treating a nylon 6 and/or nylon 66 cord yarn with an adhesive wherein at least one of the following processes (i) and (ii) is employed: (i) the adhesive treatment is carried out under elongation of at least 3%, and (ii) as the adhesive, a liquid mixture of a resorcinol/formaldehyde (R/F) condensate and a rubber latex is used, in which at least 20 wt. % of the condensate has a R/F molar ratio of 1/1.9-1/1.</p> |
