5  US  6,878,770  B2  6  Examples of  R  radicals are alkyl radicals, such as methyl,  ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl,  n-pentyl, isopentyl, neopentyl, tert-pentyl, hexyl, such as  n-hexyl, heptyl, such as n-heptyl, octyl, such as n-octyl and  isooctyl, such as 2,2,4-trimethylpentyl, nonyl, such as  n-nonyl, decyl, such as n-decyl, dodecyl, such as n-dodecyl,  and octadecyl, such as n-octadecyl, cycloalkyl, such as  cyclopentyl, cyclohexyl, cycloheptyl and methylcyclohexyl,  aryl, such as phenyl, naphthyl, anthryl and phenanthryl,  alkaryl, such as o-, m-, p-tolyl, xylyl and ethylphenyl, and  aralkyl, such as benzyl, a-phenylethyl and ~-phenylethyl.  Examples of substituted  R  radicals are haloalkyl, such as  3,3,3-trifluoro-n-propyl, 2,2,2,2’,2’,2’-hexafluoroisopropyl,  heptafluoroisopropyl and haloaryl, such as o-, m- and  p-chlorophenyl.  R  is preferably methyl.  Examples of  R radicals are alkyl, such as methyl, ethyl,  n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl,  isopentyl, neopentyl, tert-pentyl, hexyl, such as n-hexyl,  heptyl, such as n-heptyl, octyl, such as n-octyl and isooctyl,  such as 2,2,4-trimethylpentyl.  R $^{2 }$is preferably an organic radical selected from the group  where r is an integer from 1 to 20 and preferably from 2 to  8, and ----(N) is the bond to the nitrogen atom of the  structural unit  Y  of the formula  (I)  and alkylene radicals, such as  and  Examples of  R  2  radicals are aliphatic, cycloaliphatic and  aromatics-containing divalent organic radicals which con- tain hydroxyl functions from the epoxide ring opening such  as  (VI),  (VII)  (Si)-(R $^{5}$),---CR$^{6}$(0H)---CR$^{6}$$_{2}$-(N)  -(CH$_{2}$),,-- -(CH$_{2}$CH$_{2}$CH(CH$_{3}$ )- ---CH$_{2}$CH(CH$_{3}$)CH$_{2}$ - -(CH$_{2}$)- -(CH2),0CH2CHCH20H  I  (N)  R 7  is a trivalent hydrocarbon radical having 3 to 12 carbon  atoms per radical and t is  O  or  1.  R  $^{6 }$is a hydrogen atom or a monovalent hydrocarbon radical  having 1 to  10  carbon atoms per radical which may be  substituted by an ether oxygen atom,  R 5  is a divalent hydrocarbon radical having 1 to  10  carbon  atoms per molecule which may be substituted by an ether 55  oxygen atom,  a divalent hydrocarbon radical having 1 to  10  carbon atoms  per radical,  where  (Si)- is the bond to the silicon atom of the  siloxane unit of the formula  (IV) or (V) as the case may be 50  and ----(N) is the bond to the nitrogen atom of the structural  unit  Y  or  Y’  of the formula  (I)  or (I’) as the case may be, 