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Verfahren zur Umwandlung reaktiver Gruppen an Si-C-gebundenen Resten von Silanen unter gleichzeitiger Vergrößerung von deren räumlichem Abstand zueinander

METHOD FOR CONVERTING REACTIVE GROUPS OF SI-C-BOUND GROUPS OF SILANES WHILE SIMULTANEOUSLY INCREASING THE PHYSICAL DISTANCE BETWEEN SAID GROUPS
 
: Wolter, Herbert; Nique, Somchith

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Frontpage ()

DE 102012109685 A1: 20121011
German
Patent, Electronic Publication
Fraunhofer ISC ()

Abstract
The invention relates to a method for converting reactive groups of Si-C-bound groups of silanes or siloxanes while simultaneously increasing the physical distance between said groups. The Si-C-bound groups have the grouping -AW(Z)a, where A represents a coupling group selected from -S-, -NH-, and NR3, R3 representing an unsubstituted or substituted hydrocarbon group or a (meth)acryl group; W is a substituted or unsubstituted hydrocarbon group, the chain of which can be broken by one or more groups of -S-, -O-, -NH-, -NR3-, -C(O)O-, -NHC(O)-, -C(O)NH-, -NHC(O)O-, -C(O)NHC(O)-, -NHC(O)NH-, -S(O)-, -C(S)O-, -C(S)NH-, -NHC(S)-, and -NHC(S)O-, R3 having the aforementioned meaning; Z represents a functional group which can be the same or different and is selected from OH, the carboxylic acid group -COOH, or a salt or an ester of said group; and a = 2, 3, 4, 5 or a greater number. The invention is characterized in that, in a single or a second reaction, said groups of the silanes or siloxanes are either reacted with a compound (II) Y-(W)k-(Q)b (II), where Y is NCO, epoxy, or, if the groups Z are hydroxy groups, COA', A' representing hydroxy, a halide, or -OC(O)R4,in which R4 is an unsubstituted or substituted hydrocarbon group; W has the aforementioned meaning; Q is either R1 or OH, NR7 2, NR7 3+ CO2H, SO3H, PO(OH)2, (O)PO(OH)2, (O)PO(OR4)2,or a salt or an ester of the aforementioned acids, wherein R1 is an unsaturated, organically polymerizable group, R4 has the aforementioned meaning, and R7 has either the same meaning as R4 or two groups of R7 together can represent an optionally substituted, optionally unsaturated alkylene group; k = 0 or 1, where k = 0 only in the event that Y represents COA'; and b = 1, 2, 3, 4 or a greater number; or, in the event that Z = OH, the groups of the silanes or siloxanes are reacted with P2O5 or POCI3. The invention further relates to a method for producing silanes or siloxanes with the grouping -AW(Z)a and to multiple methods which have additional method steps on the basis of the aforementioned single or second reaction, the physical distance between the groups Q being increasable and the number thereof optionally being increasable by means of said method steps. Furthermore, the invention relates to silanes and silicic acid (hetero)polycondensates which can be produced using said methods.

: http://publica.fraunhofer.de/documents/N-311053.html