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    Preparation of linear chlorosiloxanes from cyclotrisiloxanes
    1.
    发明授权
    Preparation of linear chlorosiloxanes from cyclotrisiloxanes 失效
    由环三硅氧烷制备线性氯硅氧烷

    公开(公告)号：US3162662A

    公开(公告)日：1964-12-22

    申请号：US10397861

    申请日：1961-04-19

    Applicant: DOW CORNING

    Inventor： BROWN PAUL L ,  FRANKLIN HYDE JAMES

    IPC: C07F7/08 ,  C08G77/00 ,  C08G77/06

    CPC classification number: C07F7/0874 ,  C07F7/0861 ,  C07F7/0883 ,  C08G77/00 ,  C08G77/06

    Abstract: A linear organopolysiloxane is made by interacting (A) an organo cyclotrisiloxane of the formula (R2SiO)3, in which each R is H or a hydrocarbon (saturated or unsaturated), haloaryl, fluoroaliphatic or a cyanoalkyl radical, with (B) a silicon compound containing from 1 Si-bonded halogen atom per molecule to 4 Si-bonded halogen atoms per Si atom, any remaining Si valencies being satisfied by substituents which are Si-bonded oxygenations or R substituents as above defined, whereby the cyclotrisiloxane (A) forms a linear polymer having attached to one terminal Si atom a halogen atom from (B) and having attached to the other terminal Si atom through a siloxane linkage the Si atom of (B) from which the halogen atom separated, thus, e.g.: The process may be effected in the presence of certain catalysts, viz. amines, amine salts of monocarboxylic acids, amine salts of hydrogen halides, ammonium and quarternary ammonium halides, ammonium and quarternary ammonium carboxylates, amides, alkali metal halides and inert organic solvents having a static dielectric constant greater than 4, numerous examples of which are given. The reaction can be carried out in a solvent-free state, in non-catalytic solvents, such as benzene, hexane, toluene and xylene, or in polar solvents, and at room or elevated temperature. In typical examples (in which Me=methyl), (1) (Me2-SiO)3, SiCl4, acetonitrile and dimethyl-formamide were mixed together in a capped bottle for 1 hour at room temperature to yield Cl3Si(OSiMe2)3Cl; (15) (Me2SiO)3, MeH.SiCl, acetonitrile and dimethyl-formamide were stirred at room temperature for 68 hours to yield a mixture of Me2H.Si(OSiMe2)3 Cl and Me2HSi(OSiMe2)6Cl. Specification 597,178 is referred to.

    Preparation of linear siloxanes
    2.
    发明授权
    Preparation of linear siloxanes 失效
    线性硅氧烷的制备

    公开(公告)号：US3146251A

    公开(公告)日：1964-08-25

    申请号：US12783261

    申请日：1961-07-31

    Applicant: DOW CORNING

    Inventor： BROWN PAUL L ,  FRANKLIN HYDE JAMES

    IPC: C07F7/08 ,  C08G77/06 ,  C08G77/14

    CPC classification number: C08G77/06 ,  C07F7/0836 ,  C07F7/0859 ,  C07F7/0874 ,  C08G77/14 ,  Y10S528/901

    Abstract: Linear siloxanes are made by reacting a hexaorganocyclotrisiloxane free from active hydrogen with a hydroxylated compound selected from water, hydrocarbon alcohols containing not more than 8 C atoms, and organosilicon compounds of the formulae R(SiR2O)nH and HO(SiR2O)nH, in which each R is an organic radical free from active hydrogen and n is a positive integer, in contact with a basic amino compound having a basic dissociation constant in dilute solution in water of from 10-7 to 10-1 at 25 DEG C. The Si-bonded organic radicals may be any hydrocarbon (saturated or unsaturated) or hydrocarbon ether radical with or without halogen substituents. The alcohols used can be primary, secondary and tertiary alcohols containing one, two or more -OH groups, and the amino compound serving as catalyst (but not as a rearrangement catalyst) can be ammonia or a primary, secondary or tertiary amine, including amino-organosilicon compounds as disclosed in Specifications 684,296 and 716,536; numerous examples of alcohols and amines are given. The stable products are isolated by removing the catalyst, e.g. by heating and/or evacuation. In a typical Example (1) hexamethylcyclotrisiloxane, n-butanol and di-n-hexylamine were shaken together at room temperature to yield, after stripping at 120 DEG C. under reduced pressure, C4H9O[Si(CH3)2O]9H.

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