| 摘要 |
Polysiloxane sols preparable by subjecting (1) in a first stage (A) a silicon compound of the general formula I: <?in-line-formulae description="In-line Formulae" end="lead"?>(Z<SUB>o</SUB>L-)<SUB>m</SUB>Si(H)<SUB>n</SUB>(R)<SUB>p</SUB> (I), <?in-line-formulae description="In-line Formulae" end="tail"?> which is free of carbamate groups and where o is an integer from 1 to 5; m is 0, 1, 2 or 3; n is an integer from 1 to 4; p is 0, 1 , 2 or 3; Z is a reactive functional group, excluding carbamate group; L is an at least divalent, linking, organic group; H is a hydrolyzable, monovalent, organic group or hydrolyzable atom; R is a nonhydrolyzable, monovalent, organic group; to partial hydrolysis and condensation in the presence (B) of at least one crosslinking agent, and then subjecting (2) in a further stage, the reaction mixture (1) to complete hydrolysis and condensation with (C) a hydrolyzable, carbamate-functional silicon compound of the general formula II: <?in-line-formulae description="In-line Formulae" end="lead"?>{[HR<SUP>1</SUP>N-(O)C-O-]<SUB>r</SUB>L-}<SUB>s</SUB>Si(H)<SUB>t</SUB>(R)<SUB>u</SUB> (II) <?in-line-formulae description="In-line Formulae" end="tail"?> where R<SUP>1 </SUP>is a hydrogen atom or group R; r is an integer from 1 to 5; s is 1, 2 or 3; t is 1, 2 or 3; u 0, 1 or 2; and their use as coating materials, adhesives, and sealing compounds and also for producing optical moldings and self-supporting films.
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