Process for making isocyanatoorganosilanes
AssigneeOSi Specialties, Inc.
InventorsJeffrey Y. P. Mui, Mark P. Bowman
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Abstract
A method is described for the preparation of an isocyanatoorganosilane by an elevated temperature thermally induced decomposition of a carbamatoorganosilane in the gas phase preferably under ambient or reduced pressure.
Claims9
A method for preparing an isocyanatoorganosilane comprising vaporizing a carbamatoorganosilane and heating said vaporized carbamatoorganosilane in a reaction zone at an elevated temperature for a time sufficient to form said isocyanatoorganosilane.
An isocyanatoorganosilane having the formula R.sub.x (R"O).sub.3-x SiR'NCO, wherein x is an integer having a value of 0, 1, 2, or 3, each R separately represents an alkyl group of 1 to 12 carbon atoms, a halogenated alkyl group of 1 to 12 carbon atoms, a cycloalkyl group or a halogenated cycloalkyl group of 5 to 8 carbon atoms, an aryl group of 6 to 14 carbon atoms, or an alkaryl or aralkyl group of 7 to 15 carbon atoms, each R" separately represents R, a silyl group R.sub.3 Si--, a siloxy group R.sub.3 Si(OSiR.sub.2).sub.m -- wherein m is an integer having a value of 1 to 4, or two R" groups together may form a divalent siloxy group of the formula --SiR.sub.2 (OSiR.sub.2).sub.n -- wherein n is an integer having a value of 3, 4, or 5, and R is as defined above, and R' is selected from the group consisting of --CH.sub.2 CH.sub.2 CMe.sub.2 --, --CH.sub.2 CH.sub.2 CHMeCH.sub.2 --, --CH.sub.2 CH.sub.2 CMe.sub.2 CH.sub.2 --, and --CH.sub.2 CHMeCH.sub.2 --, where Me is a methyl group.
Dependencies are inferred from the claim text.