| abstract |
(57) [Abstract] [Purpose] To prevent deterioration of the strength of polyester fiber used as a rubber reinforcing material in the adhesive treatment process. [Structure] A boron compound is applied to a polyester fiber for rubber reinforcement by various methods. For example, a boron compound is mixed with a spinning oil containing a lubricant, an emulsifier, etc. to prepare a rubber-reinforcing polyester fiber treating agent composition, which is applied to the polyester fiber. Alternatively, a boron compound is added to an adhesive such as an RFL solution used in the adhesive treatment step and applied to the polyester fiber for rubber reinforcement. |