Osp-containing composition for automotive brake fluid

Abstract

Disclosed is a composition of brake fluid for a vehicle. The composition includes an amount of about 30 to 60 wt % of a boric ester compound; an amount of about 30 to 60 wt % of alkylene glycol alkyl ether; and an amount of about 0.05 to 10 wt % of oil soluble polyalkylene glycol (OSP), based on the total weight of the composition. Accordingly, the OSP-containing composition for brake fluid may decreases a moisture absorption amount of the brake fluid in the air and maintain a high boiling point of the brake fluid for a long period of time, thereby extending a period for changing brake fluid and improving corrosion prevention performance, metal wear prevention performance, and an operation of a master cylinder.

What is claimed is: 
     
         1 . A composition for automotive brake fluid, comprising:
 an amount of about 30 to 60 wt % of a boric ester compound;   an amount of about 30 to 60 wt % of alkylene glycol alkyl ether; and   an amount of about 0.05 to 10 wt % of oil soluble polyalkylene glycol (OSP),   all the wt % based on the total weight of the composition.   
     
     
         2 . The composition of  claim 1 , wherein the oil soluble polyalkylene glycol (OSP) is a polymer including a repeating structure represented by the following Chemical Formula: 
       
         
           
           
               
               
           
         
         wherein R 1  and R 2  are same or different, and each is independently a linear or cyclic alkyl group having at least two carbon atoms; and m and n are each independently an integer of 10 or greater. 
       
     
     
         3 . The composition of  claim 1 , wherein the alkylene glycol alkyl ether is at least one selected from the group consisting of triethylene glycol monomethyl ether, triethylene glycol monobutyl ether, polyethylene glycol monomethyl ether, polyethylene glycol monobutyl ether, and diethylene glycol monobutyl ether. 
     
     
         4 . The composition of  claim 1 , further comprising:
 an amount of about 0.1 to 2.0 parts by weight of a metal corrosion inhibitor and an amount of about 0.1 to 2.0 parts by weight of an antioxidant, based on 100 parts by weight of the composition.   
     
     
         5 . The composition of  claim 4 , wherein the metal corrosion inhibitor comprises an amount of about 0.05 to 1.5 parts by weight of an alkylamine based metal corrosion inhibitor and an amount of about 0.05 to 0.5 parts by weight of a triazole based metal corrosion inhibitor, based on 100 parts by weight of the composition. 
     
     
         6 . The composition of  claim 5 , wherein the alkylamine based metal corrosion inhibitor is at least one selected from the group consisting of methylamine, dibutylamine, triethylamine, triethanolamine, and cyclohexylamine. 
     
     
         7 . The composition of  claim 5 , wherein the triazole based metal corrosion inhibitor is at least one selected from the group consisting of benzotriazole, mercaptobenzotriazole, and tolyltriazole. 
     
     
         8 . The composition of  claim 4 , wherein the antioxidant is 3,5-di(tert-butyl)-4-hydroxytoluene (BHT). 
     
     
         9 . A vehicle that comprise a composition of  claim 1 . 
     
     
         10 . The vehicle of  claim 9 , wherein the composition is used as a brake fluid.