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Process for preparing organosiloxanes

  • US 5,011,962 A
  • Filed: 05/30/1990
  • Issued: 04/30/1991
  • Est. Priority Date: 06/05/1989
  • Status: Expired due to Fees
First Claim
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1. A process for preparing organosiloxanes (1) of the general formula


  • space="preserve" listing-type="equation">R.sub.4-n.sup.1 Si(OSiR.sub.3).sub.n,
in which R is selected from the group consisting of a hydrogen atom, a monovalent hydrocarbon radical having from 1 to 18 carbon atoms per radical and a substituted monovalent hydrocarbon radical having from 1 to 18 carbon atom per radical, R1 is selected from the group consisting of R and a chlorine atom, and n is 3 or 4, which comprises reacting an organodisiloxane (2) of the general formula


space="preserve" listing-type="equation">(R.sub.3 Si).sub.2 O,with a chlorosilane (3) of the general formula


space="preserve" listing-type="equation">R.sub.4-n SiCl.sub.n,in which R and n are the same as above, in the presence of phosphonitrile chlorides (4) and a cocatalyst (5), in which the cocatalyst (5) is used concomitantly with the phosphonitrile chlorides (4) and is selected from the group consisting of amides of the general formula


space="preserve" listing-type="equation">X-C(O)-R.sup.2,in which R2 is selected from the group consisting of a hydrogen atom, a monovalent hydrocarbon radical having from 1 to 8 carbon atoms per radical and a substituted monovalent hydrocarbon radical having from 1 to 8 carbon atom per radical, and X is selected from th consisting of a radical of the formula R22 N- and ##STR4## where R2 is the same as above and R3 is a divalent hydrocarbon radical having from 5 to 7 carbon atoms per radical, urea, urea derivatives of the general formula


space="preserve" listing-type="equation">X-C(O)-X,where X is the same as above and cyanuric acid.

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