Fiber cord for reinforcement and method for producing the same

Abstract

A fiber cord for reinforcement has an adhesive treatment agent attached to a surface thereof and includes, in an inner layer part thereof, two kinds of compounds each having a molecular weight of less than 1,000. The main compound is an aromatic compound or contains an α-dicarboxylic acid component, and the other compound is an aliphatic compound or an alicyclic compound. It is preferable that the adhesive treatment agent is a resorcin-formalin- latex-based adhesive, that the fiber cord includes a twisted synthetic fiber, that the aromatic compound is a heterocyclic compound, that the main compound is located only in the inner layer part of the fiber cord, that a compound having a hexamethylene diisocyanate trimer structure is present, and that no latex is present in the inner layer part of the fiber cord. This fiber cord is produced through a two-stage treatment with a pre-treatment liquid and adhesive treatment liquid.

1 . A fiber cord for reinforcement, comprising an adhesive treatment agent attached to a surface thereof, characterized in that the fiber cord includes, in an inner layer part thereof, a compound A 1  having a molecular weight of less than 1,000 and a smaller amount of a compound B 1  than the compound A 1 , the compound A 1  being an aromatic compound or a compound containing an α-dicarboxylic acid component, the compound B 1  being an aliphatic compound or an alicyclic compound. 
     
     
         2 . The fiber cord for reinforcement according to  claim 1 , wherein the adhesive treatment agent is a resorcin-formalin-latex (RFL)-based adhesive. 
     
     
         3 . The fiber cord for reinforcement according to  claim 1 , wherein the fiber cord includes a twisted multifilament fiber. 
     
     
         4 . The fiber cord for reinforcement according to  claim 1 , wherein the fiber cord includes a synthetic fiber. 
     
     
         5 . The fiber cord for reinforcement according to  claim 1 , wherein the aromatic compound is a heterocyclic compound. 
     
     
         6 . The fiber cord for reinforcement according to  claim 1 , wherein the compound A 1  is located only in the inner layer part of the fiber cord. 
     
     
         7 . The fiber cord for reinforcement according to  claim 1 , wherein a compound having a hexamethylene diisocyanate (HDI) trimer structure is present in the inner layer part of the fiber cord. 
     
     
         8 . The fiber cord for reinforcement according to  claim 1 , wherein no latex is present in the inner layer part of the fiber cord. 
     
     
         9 . A method for producing a fiber cord for reinforcement, including treating a fiber cord in two stages with a pre-treatment liquid and an adhesive treatment liquid,
 the method being characterized in that   the pre-treatment liquid contains two kinds of blocked isocyanate compounds that are a compound A 2  and a smaller amount of a compound B 2 , the compound A 2  having an isocyanate group blocked with an aromatic compound or a compound containing an α-dicarboxylic acid component, the compound B 2  having an isocyanate group blocked with an aliphatic compound or an alicyclic compound, and   a fiber cord having the pre-treatment liquid attached thereto is once subjected to a heat treatment, and then the adhesive treatment liquid is attached thereto, followed by a drying treatment.   
     
     
         10 . The method for producing a fiber cord for reinforcement according to  claim 9 , wherein the aromatic compound is a heterocyclic compound. 
     
     
         11 . The method for producing a fiber cord for reinforcement according to  claim 9 , wherein the unblocking temperature of the compound A 2  is lower than the unblocking temperature of the compound B 2 . 
     
     
         12 . The method for producing a fiber cord for reinforcement according to  claim 9 , wherein the compound A 2  has a hexamethylene diisocyanate (HDI) trimer structure. 
     
     
         13 . The method for producing a fiber cord for reinforcement according to  claim 9 , wherein the compound B 2  has an isocyanate group blocked with an aliphatic compound or an alicyclic compound. 
     
     
         14 . The fiber cord for reinforcement according to  claim 2 , wherein the fiber cord includes a twisted multifilament fiber. 
     
     
         15 . The method for producing a fiber cord for reinforcement according to  claim 10 , wherein the unblocking temperature of the compound A 2  is lower than the unblocking temperature of the compound B 2 .