Rubber-reinforcing glass fiber treatment agent, rubber-reinforcing cord using the fiber treatment agent, and rubber product

Abstract

There are provided a rubber-reinforcing glass fiber treatment agent capable of improving various properties, in particular the oil resistance, of a rubber product, a rubber-reinforcing cord using the fiber treatment agent, and a rubber product having high oil resistance. The rubber-reinforcing glass fiber treatment agent contains a resorcin-formaldehyde water-soluble condensate and a soap-free acrylonitrile-butadiene copolymer latex. Here, “soap-free” means that polymerization has been carried out using, instead of a conventional emulsifier or surfactant, a polymerization initiator such as potassium persulfate, a styrenesulfonate, an acrylic or allylic reactive emulsifier or water-soluble polymer, or a hydrophilic comonomer such as a water-soluble oligomer or acrylic acid.

1 . A rubber-reinforcing glass fiber treatment agent containing a resorcin-formaldehyde water-soluble condensate and a soap-free acrylonitrile-butadiene copolymer latex.  
     
     
         2 . A rubber-reinforcing glass fiber treatment agent as claimed in  claim 1 , wherein a content of the resorcin-formaldehyde water-soluble condensate is 3 to 35 wt % in terms of solids, and a content of the soap-free acrylonitrile-butadiene copolymer latex is 35 to 97 wt % in terms of solids, relative to a weight of total solids in the fiber treatment agent.  
     
     
         3 . A rubber-reinforcing glass fiber treatment agent as claimed in  claim 1 , wherein a total solid content is 15 to 35 wt %.  
     
     
         4 . A rubber-reinforcing glass fiber treatment agent as claimed in  claim 2 , wherein a total solid content is 15 to 35 wt %.  
     
     
         5 . A rubber-reinforcing cord obtained by treating glass fibers using a fiber treatment agent as claimed in  claim 1 .  
     
     
         6 . A rubber-reinforcing cord as claimed in  claim 5 , wherein an attachment rate of the fiber treatment agent in terms of total solids is 10 to 30 wt %.  
     
     
         7 . A rubber product containing a rubber-reinforcing cord as claimed in  claim 5.