US2007259792A1PendingUtilityA1

Functional fluid compositions

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Individually held — no corporate assignee on recordPriority: Mar 22, 2006Filed: Mar 20, 2007Published: Nov 8, 2007
Est. expiryMar 22, 2026(expired)· nominal 20-yr term from priority
Inventors:Volker Klaus Null
C10N 2030/08C10M 169/041C10N 2020/02C10M 2203/1025C10M 2205/173C10N 2040/08C10N 2030/02C10N 2020/071C10M 2207/2835C10M 2209/084C10N 2020/065C10M 105/04C10N 2020/081F15B 21/00C10M 105/02C10M 169/02
36
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Claims

Abstract

The present invention provides a fluid composition comprising (a) from 70 to 99.99% by weight, based on the total hydraulic fluid composition, of a readily biodegradable base oil composition comprising (i) from 80 to 100% by weight of a base oil or base stock having a paraffin content of greater than 80% by weight paraffins and a saturates content of greater than 98% by weight and comprising a series of iso-paraffins having n, n+1, n+2, n+3 and n+4 carbon atoms and wherein n is between 15 and 35, and having a kinematic viscosity at 100° C. of at most 5.5 mm 2 /sec; and (ii) of from 0 to 20% by weight of an ester of a polyhydroxy compound, calculated on the base oil composition; and (b) a viscosity index improver in an amount of from 0.01 to 30% by weight, based on the total hydraulic fluid composition, wherein the hydraulic fluid composition has a viscosity index in the range of from 50 to 1000, and a pour point of −30° C. or below.

Claims

exact text as granted — not AI-modified
1 . A fluid composition comprising 
 (a) from 70 to 99.99% by weight, based on the total hydraulic fluid composition, of a readily biodegradable base oil composition comprising    (i) from 80 to 100% by weight of a base oil or base stock having a paraffin content of greater than 80% by weight paraffins and a saturates content of greater than 98% by weight and comprising a series of iso-paraffins having n, n+1, n+2, n+3 and n+4 carbon atoms and wherein n is between 15 and 35, and having a kinematic viscosity at 100° C. of at most 5.5 mm 2 /sec; and    (ii) of from 0 to 20% by weight of an ester of a polyhydroxy compound, calculated on the base oil composition; and    (b) a viscosity index improver in an amount of from 0.01 to 30% by weight, based on the total hydraulic fluid composition,    wherein the hydraulic fluid composition has a viscosity index in the range of from 50 to 1000, and a pour point of −30° C. or below.    
   
   
       2 . A fluid composition according to  claim 1 , wherein viscosity index is in the range of from 100 to 600.  
   
   
       3 . A fluid composition according to  claim 1 , having a flashpoint of at least 80° C.  
   
   
       4 . A fluid composition according to  claim 1 , having a kinematic viscosity at 40° C. of at least 7 mm 2 /sec.  
   
   
       5 . A fluid composition according to  claim 1 , wherein the viscosity improver is present in an amount of from 5 to 15% by weight.  
   
   
       6 . A fluid composition according to  claim 1 , wherein the viscosity improver comprises a polymethylmethacrylate polymer.  
   
   
       7 . A fluid composition according to  claim 1 , further comprising saturated cyclic hydrocarbons in an amount of from 5 to 10% by weight.  
   
   
       8 . A fluid composition according to  claim 1 , wherein the ester component is a pentaerythritol ester of pentaerythritol with from 1 to 4 branched or linear fatty acids having up to 10 carbon atoms.  
   
   
       9 . A shock absorber comprising the fluid according to  claim 1 .  
   
   
       10 . A hydraulic system comprising the fluid according to  claim 1 .  
   
   
       11 . A vehicle comprising a shock absorber according to  claim 9 .  
   
   
       12 . A vehicle comprising a hydraulic system according to  claim 10.

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