Cyclic phospazene compounds and use thereof as additives of perfluoropolyether oils

Abstract

Cyclic phosphazene compounds of formula (I): wherein: Q is a cyclic compound of formula: A is an end group of the —OCF 2 X, —OC 2 F 4 X, —OC 3 F 6 X type, wherein X=F, Cl, H; R f and R′ f are (per)fluoropolyoxyalkylene chains having a number average molecular weight in the range 280-5,000.

1 - 7 . (canceled)  
     
     
         8 . Compositions having lubricating anti-wear properties comprising: 
 an oil or a grease having a perfluoropolyether structure; and    from 0.05 to 10% by weight of a following phosphazene compound of formula (I) or (II) or (III) or (IIA) or (IIB) or (IIIA), or mixtures thereof:    wherein formula (I) is:                        wherein:    Q is a cyclic phosphazene structure                          wherein n′ is an integer equal to 3    or 4, ω=0 or ε=4 or 6, y=0 or 1, α and β are integers from 0 to 8. δ=0 or 1, with the proviso that: 
 when n′=3 and y=1 then ε=4, α and β are integers from 0 to 5, such that (α+β) is equal to 5; δ=1;  
 when n′=3 and y=1 then ε=4, α and β are integers from 0 to 6, such that (α+β) is equal to 6, ω and δ are equal to 0;  
 when n′=4 and y=1 then ε is equal to 6, α and β are integers from 0 to 7, such that (α+β) must be equal to 7 and δ=1;  
 when n′=4 and y=0 then ε is equal to 6, α and β are integers from 0 to 8, such that (α+β) must be equal to 8, ω and δ are equal to 0;  
   A is an end group of the —OCF 2 X, —OC 2 F 4 X, —OC 3 F 6 X type, wherein X=F, Cl, H; R f  and R′ f  are (per)fluoropolyoxyalkylene chains having a number average molecular weight in the range 280-5,000 and comprising one or more repeating units statistically distributed along the chain selected from (C 3 F 6 O); (CFYO) wherein Y is F or CF 3 ; (CF 2 F 2 O); (CF 2 ) x′ CF 2 O wherein x′ is an integer equal to 1 or 2; (CR 4 R 5 CF 2 O) wherein R 4  and R 5  are equal to or different the one from the other and selected between H, Cl and wherein one fluorine atom of the perfluoromethylene unit can optionally be substituted with H, Cl or (per)fluoroalkyl;    R f  and R′ f  are (per)fluoropolyoxyalkylene chains having a number average molecular weight in the range 280-5.000, preferably 500-2,000 and comprising one or more repeating units statistically distributed along the chain selected from (C 3 F 6 O);      wherein formulae (II) or (III) respectively are:                          wherein:    n′ is an integer equal to 3 or 4:    A is an end group of the —OCF 2 X, —OCF 2 X, —OC 2 F 4 X, —OC 3 F 6 X type wherein    X=F, Cl, H: ω is an integer equal to 0 or 1;    α and β are integers comprised between 0 and 5, such that α+β must be equal to 5; R f  and R′ f  are as above    wherein formula (IIA) is:                          wherein R′ f  has structure (a′) and a number average molecular weight between 500 and 700, Y=CF 3  and A=—OC 3 F 6 Cl    wherein formula (IIB) is:                          wherein R′ f  is as above    wherein formula (IIIA) is:                          wherein R′ f  has structure (a′) and number average molecular weight comprised between 500 and 700, Y=—CF 3  and A=—OC 3 F 6 Cl; R f  has structure (a) and a number average molecular weight in the range 1.000-2,000.    
     
     
         9 . Compositions according to  claim 8 , wherein the perfluoropolyether of the lubricating oil or grease is selected from the following classes: 
 (1) B—O-[CF(CF 3 )CF 2 O] m′ (CFXOQ) n′ -B′
 wherein X is equal to —F or —CF 3 ;  
 B and B′, equal to or different from each other, are selected from —CF 3 , —C 2 F 5  or —C 3 F 7 ;  
 m′ and n′ are integers such that the m′/n′ ratio is in the range 20-1,000 and the product viscosity is in the range 10-4,000 cSt; the various units are statistically distributed along the chain;  
   (2) C 3 F 7 O-[CF(CF 3 )CF 2 O] o′ -D 
 wherein:  
 D is equal to —C 2 F, or —C 3 F 7 ;  
 o′ is an integer such that the product viscosity is in the above range;  
   (3) {C 3 F 7 O-[CF(CF 3 )CF 2 O] p′ -CF(CF 3 )-} 2      wherein:    p′ is an integer such that the product viscosity is in the above range;    (4) B—O-[CF(CF 3 )CF 2 O] q′ (C 2 F 4 O) r′ (CFX) s′ -B′   wherein:    X is equal to —F or —CF 3 ;    B and B′, equal to or different from each other, are selected from —CF 3 , —C 2 F 5  or —C 3 F 7 ; q′, r′ and s′ are integers, the 0 also comprised, such that the product viscosity is in the above range;    (5) B—O-(C 2 F 4 O) t′ (CF 2 O) u′ -B′   wherein:    B and B′, equal to or different from each other, are selected from —CF 3 , —C 2 F 5  or —C 3 F 7 ; q′, r′ and s′ are integers, the 0 also comprised, such that the product viscosity is in the above range;    (5) B—O-(C 2 F 4 O) t′ (CF 2 O) u′ -B′   wherein:    B and B′, equal to or different from each other, are selected from —CF 3 , —C 2 F, or —C 3 F 7 ;    t′ and u′ are integers such that the t′/u′ ratio is comprised between 0.1 and 5 and the product viscosity is in the above range;    (6) B—O-(CF 2 CF 2 CF 2 O) v′ -B′   wherein:    B and B′, equal to or different from each other, are selected from —CF 3 , —C 2 F, or —C 3 F 7 ;    v′ is a number such that the product viscosity is in the above range;    (7) D—O-(CF 2 CF 2 —O) z′ -D′   wherein:    D and D′, equal to or different from each other, are selected from —C 2 F 5  or —C 3 F 7 ;    z′ is an integer such that the product viscosity is in the above range;    (8) R′″ f′″ [C(CF 3 ) 2 C(R′″ f ) 2 C(R′″ f ) 2 -O—] w′ R′″ f      wherein:    R′″ f  is a perfluoroalkyl group;    R″ f  is equal to —F or perfluoroalkyl;    w′ represents a number higher than or equal to 8.    
     
     
         10 - 14 . (canceled)  
     
     
         15 . Compositions according to  claim 8 , wherein the compositions comprise from 0.5 to 5% by weight of the phosphazene compound of formulae (I), (II), (III), (IIA), (IIB), (IIIA), or mixtures thereof.