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# United States Patent r19J 

# King, III et al. 

# [54] METHOD FOR MAKING POLYSII:.AZANES 

[75] Inventors: Roswell E. King, III, Pleasantville; Bernard Kanner, West Nyack; Steven P. Hopper, Carmel; Curtis L. Schilling, Jr., Croton-on-Hudson, all ofN.Y. 

[73] Assignee: Union Carbide Corporation, Danbury, Conn. 

[21] Appl. No.: 841,545 

[22] Filed: Mar. 19, 1986 

[51] Int. Cl. 4 .............................................. C07F 7/10 

[52] U.S. CI. .................................... 556/412; 556/410; 501/97; 501/154; 528/28; 528/38; 423/344 

[58] Field of Search .................. 556/410, 412; 501/97, 501/154; 423/344; 528/28, 38 

## [56] References Cited 

<img src='content_image/938224.jpg'>

Primary Examiner-Paul F. Shaver 

Attorney, Agent, or Firm-P. W. Luezzi 

## U.S. PATENT DOCUMENTS 

# [1 lJ Patent Number: 4,675,424 

# [45] Date of Patent: Jun. 23, 1987 

## [57] ABSTRACT 

A method of preparing silazane polymers, with 3 or more repeating units, of the general formula 

<img src='content_image/938229.jpg'>

and a (CH3)2NH byproduct group where R is hydro› gen, an alkyl group’ having 1-6 carbon atoms or an aryl group having 6-12 carbon atoms, a=0, or I, b=2-4, C=0-2, d=0 or I, e=0-2, f=0-2, g= 1-3 and a+c› +e+f+g=4 for the polymer units; and R’ is hydrogen or methyl, whereby the silazane polymer is substantially free of halide impurities, and wherein this method com› prises: 

transaminating an aminosilane of the general formula (R)a((CH3)2N)1,HcS; where R is defined as above and a+b+c=4 with an amine of the general formula (CHJ)dNHJ-dWhereby dis defined as above and the amine has a molecular weight lower than 45 all in the presence of an acid catalyst or the ammonium salt of the acid and thereafter condensing to form the poly› mer. 

## 37 Claims, No Drawings 

