Fluoroalkyl silanes are a class of compounds useful for various industrial purposes. For example, fluoroalkyl silanes which have hydrolysable groups (called hydrolysable fluoroalkyl silanes), are compounds useful as surface treatment agents which provide durable hydrophobic and oleophobic coatings. In general, hydrolysable fluoroalkyl silanes can be represented with the following formula: (RO—) 3 Si—R T wherein R is H or an alkyl; and R T is a monovalent organic compound terminated by a perfluoroalkyl group. When used to coat a surface, the (RO—) 3 moiety reacts (via hydrolysis) with various chemical groups of the surface (e.g., hydroxyl, amine, or other reactive groups) thereby bonding the fluoroalkyl silane to the surface The R T moiety comprises a divalent organic linking group which links the silicon atom to a terminal group rich in fluorine atoms whose unique electronic properties impart desirable hydrophobic and oleophobic properties in a surface coating. Modification of the R T moiety is useful in the engineering of fluoroalkyl silanes. The present invention provides for fluoroalkyl silanes having R T moieties which have not been heretofore considered.
1. A fluorosilane represented by
(L) 3 -Si—(CH 2 ) n —(Z 1 ) a —[C(X 1 )] x —(Z 2 ) l -Q 1 -R f Formula 1
wherein:
each n is independently an integer from 1 to 12;
a=1, x=1, and l=1;
L is independently chosen from a hydrolysable or non-hydrolysable monovalent group
R f is chosen from a C 2 -C 12 perfluoroalkyl provided that: i) one fluorine atom of the perfluoroalkyl can be optionally replaced by hydrogen, and/or ii) the perfluoroalkyl can be optionally interrupted by at least one oxygen, methylene, or ethylene;
Q 1 is chosen from the group consisting of a C 2 -C 12 hydrocarbylene optionally interrupted by at least one divalent organic group;
X 1 is chosen from O or S;
Z 1 is —NH— and Z 2 is from the group consisting of —NH—, —S—, —NH—S(O) 2 —, —N[C(O)H]—, —[HC(COOH)(R 1 )]CH—S—, and —(R 1 )CH—[HC(COOH)]—S—;
provided that when Z 1 is —NH— and Z 2 is —NH—, then Q 1 is chosen from the group consisting of a C 2 -C 12 hydrocarbylene interrupted by at least one divalent organic group;
each R 1 is independently chosen from hydrogen, phenyl, or a monovalent C 1 -C 8 alkyl optionally terminated by —C 6 H 5 , preferably H or CH 3 .
2. The fluorosilane of claim 1 being an isocyanate derived fluorosilane wherein:
a=1, x=1, and l=1;
Z 1 is —NH— and Z 2 is from the group consisting of —NH—, —S—, —NH—S(O) 2 —, and —N[C(O)H]—;
said isocyanate derived fluorosilane represented by the formula:
(L) 3 -Si—(CH 2 ) n —Z 1 —C(X 1 )—Z 2 -Q 1 -R f .
3. The isocyanate derived fluorosilane of claim 2 being a urea or thiourea fluorosilane wherein:
Z 1 and Z 2 are both —NH—;
said urea or thiourea fluorosilane represented by the formula:
(L) 3 Si—(CH 2 ) n —NH—C(X 1 )—NH-Q 1 -R f
wherein:
X 1 is O to form a urea fluorosilane, or X 1 is S to form a thiourea fluorosilane; and
Q 1 is independently chosen from the group consisting of a C 2 -C 12 hydrocarbylene optionally interrupted by at least one divalent moiety chosen from the group consisting of —S—, —S(O)—, —S(O) 2 —, and —O—C(O)—NH—.
4. The urea or thiourea fluorosilane of claim 3 wherein R f is chosen from a C 2 -C 12 perfluoroalkyl and Q 1 is independently chosen from the group consisting of a C 2 -C 12 hydrocarbylene interrupted by at least one divalent moiety chosen from the group consisting of —S—, —S(O)—, —S(O) 2 —, and —O—C(O)—NH—.
5. The urea or thiourea fluorosilane of claim 3 wherein R f is chosen from a C 2 -C 12 perfluoroalkyl provided that: i) one fluorine atom of the perfluoroalkyl is replaced by hydrogen, and/or ii) the perfluoroalkyl is interrupted by at least one oxygen, methylene, or ethylene; Q is chosen from the group consisting of a C 2 -C 12 hydrocarbylene optionally interrupted by at least one divalent organic group.
6. The isocyanate derived fluorosilane of claim 2 being a thiolcarbamate fluorosilane wherein:
Z 1 is —NH— and Z 2 is —S—; and
X 1 is O;
said thiolcarbamate fluorosilane represented by the formulae:
(L) 3 Si—(CH 2 ) n —NH—C(O)—S-Q 1 -R f
wherein:
Q 1 is independently chosen from the group consisting of a C 2 -C 12 hydrocarbylene optionally interrupted by at least one divalent moiety chosen from the group consisting of —S—, —S(O)—, —S(O) 2 —, —N(R 1 )—C(O)—, —C(O)—N(R 1 )—, —(R 1 )N—S(O) 2 —, and
7. The thiolcarbamate fluorosilane of claim 6 wherein R f is chosen from a C 2 -C 12 perfluoroalkyl and Q 1 is independently chosen from the group consisting of a C 2 -C 12 hydrocarbylene interrupted by at least one divalent moiety chosen from the group consisting of —S—, —S(O)—, —S(O) 2 —, and —O—C(O)—NH—.
8. The thiolcarbamate fluorosilane of claim 6 wherein R f is chosen from a C 2 -C 12 perfluoroalkyl provided that: i) one fluorine atom of the perfluoroalkyl is replaced by hydrogen, and/or ii) the perfluoroalkyl is interrupted by at least one oxygen, methylene, or ethylene; Q is chosen from the group consisting of a C 2 -C 12 hydrocarbylene optionally interrupted by at least one divalent organic group.
9. The isocyanate derived fluorosilane of claim 2 being a N-sulfone urea fluorosilane wherein:
Z 1 is —NH—, and Z 2 is —NH—S(O) 2 —; and
X 1 is O;
said N-sulfone urea represented by the formula:
(L) 3 Si—(CH 2 ) n —NH—C(O)—NH—S(O) 2 -Q 1 -R f
wherein:
Q 1 is independently chosen from the group consisting of an uninterrupted C 2 -C 12 hydrocarbylene.
10. The fluorosilane of claim 1 being a formyl urea fluorosilane wherein:
a=1, x=1, and l=1; and
Z 1 is —NH—, and Z 2 is —N[C(O)H]—;
said formyl urea represented by the formula:
(L) 3 Si—(CH 2 ) n —NH—C(X 1 )—N[C(O)H]-Q 1 -R f
wherein:
Q 1 is independently chosen from the group consisting of a C 2 -C 12 hydrocarbylene interrupted by at least one divalent moiety chosen from the group consisting of —S— and —NH—.
11. The fluorosilane of claim 1 being a thioether succinamic acid fluorosilane wherein:
a=1, x=1, and l=1;
Z 1 is —NH— and Z 2 is —[HC(COOH)(R 1 )]CH—S— or
—(R 1 )CH—[HC(COOH)]—S—;
X 1 is O; and Q 1 is —(CH 2 ) 2 —
said thioether succinamic acid represented by the formulae:
(L) 3 Si—(CH 2 ) n —NH—C(O)—[HC(COOH)(R 1 )]CR 1 —(CH 2 ) m —S—(CH 2 ) 2 —R f , or
(L) 3 Si—(CH 2 ) n —NH—C(O)—(R 1 )CH—[CR 1 (COOH)]—(CH 2 ) m —S—(CH 2 ) 2 —R f
wherein m1 or 0; wherein each R 1 is independently chosen from methyl or hydrogen preferably H.