A method for preparing cyclotetrasiloxane, aliphatic chlorides and/or acyl chlorides from a chlorosilane and an acyloxy compound is disclosed. The chlorosilane and the acyloxy compound may be present as substantially equimolar amounts of separate compounds or they may be present in the same molecule in equimolar amounts. The reactants are merely heated sufficiently, with or without a soluble halide salt catalyst, to form the products. Advantageously this method can provide cyclotetrasiloxanes having water-sensitive radicals such as silicon-bonded chlorine atoms and/or silicon-bonded acyl chloride radicals.
Don L. Kleyer - Hemlock MI John L. Speier - Midland MI
Assignee:
Dow Corning Corporation - Midland MI
International Classification:
C07F 708 C07F 710 C07F 718
US Classification:
556485
Abstract:
The present invention relates to a process for the production of mixtures of novel organofunctional alkoxysilanes by the reaction of mixtures of certain substituted organic halides and chlorosilanes with molten sodium dispersed in alkoxysilanes. In the described process, the substituted organic groups of the organic halide replace alkoxy groups of the alkoxysilanes. Also claimed, are organofunctional alkoxysilanes prepared by the claimed process.
Debora F. Bergstrom - Midland MI Binh T. Nguyen - Midland MI John L. Speier - Midland MI
Assignee:
Dow Corning Corporation - Midland MI
International Classification:
C08G 7706
US Classification:
528 12
Abstract:
The present invention relates to a novel method of preparing siloxane bonds. The method comprises reacting less than or equal to 1 equivalent of a carboxylic acid with 2 equivalents of alkoxy groups on an alkoxysilane in the presence of a strong acid.
William J. Schulz - Midland MI John L. Speier - Midland MI
Assignee:
Dow Corning Corporation - Midland MI
International Classification:
C07F 718
US Classification:
556446
Abstract:
A process for the preparation of silyl ketene acetals of the formula, R. sub. 2 C. dbd. C(OSiR. sub. n X. sub. 3-n)(OZ) or ##STR1## The process comprises contacting an alpha-ester of a carboxylic acid with an alkali metal in the presence of an excess of an organohalosilane, wherein the alpha-ester has the formula, ##STR2## and the organohalosilane has the formula, R. sub. n SiX. sub. 4-n ; and facilitating reaction among the alpha-ester, the alkali metal, and the organochlorosilane to form the silyl ketene acetal and an alkali metal halide or an alkali metal alkoxide.
Method And Apparatus For The Rapid Solidification Of Molten Material In Particulate Form
Donald T. Liles - Midland MI John L. Speier - Midland MI
Assignee:
Dow Corning Corporation - Midland MI
International Classification:
B29B 910
US Classification:
264 8
Abstract:
Described are methods and apparati for the rapid solidification of molten materials into finely divided particulate form. Molten material is atomized by a centrifugal atomizer which includes a rotating member with vanes which accelerate and atomize the molten material. The mist of atomized molten material thus produced is introduced into a mist of atomized liquid coolant or a mist of finely divided volatile solid coolant or a mixture thereof. The heat of solidification of the mist of molten material is rapidly transferred to the mist of coolant whereby the molten material solidifies into fine particles.
Mercaptans are prepared by reacting an organic chloride or bromide with a mixture of H. sub. 2 S and ammonia or an amine at a temperature of 0. degree. to 175. degree. C. under autogenous pressure. The reaction can be carried out in the presence of a polar solvent. For example, 3-chloropropyltrimethoxysilane is mixed with H. sub. 2 S and ammonia in methanol and heated in a closed container at 100. degree. C. for 18 hours.
Silylamine hydrochlorides are prepared by reacting a silane of the formula (RO). sub. n R'. sub. 3-n SiR''Cl with at least two moles of an amine and thereafter volatilizing the amine to obtain a hydrochloride of the formula (RO). sub. n R'. sub. 3-n SiR''NR'''. sub. 2. HCl.
Apparatus For Rapidly Freezing Molten Metals And Metalloids In Particulate Form
John L. Speier - Midland MI Donald T. Liles - Midland MI
Assignee:
Dow Corning Corporation - Midland MI
International Classification:
B01J 214
US Classification:
425 8
Abstract:
Described is an apparatus for freezing molten metals and metalloids in particulate or flake form at very rapid cooling rates. A volatile coolant liquid is fed to the center of a rapidly rotating disc-like member to create an outwardly flowing film of coolant across the surface of the member. The material to be processed is fed in molten form to the coolant film coaxially with the coolant, and is thrown outwardly by centrifugal forces while being cooled by vaporization of the liquid. The rotating member may include upwardly projecting vanes for collision with the outwardly flowing material to produce a higher surface area product and a cover over a portion of its top surface to confine the materials passing through the vanes.