C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
400/2005, 402/9
C08G 77/42 (2006.01) C08G 77/442 (2006.01)
Patent
CA 1146294
ABSTRACT OF THE DISCLOSURE Vinyltrialkylsilane - hexaorganocyclotrisiloxane block- copolymers of the formula: Image wherein R and R' are the same or different and each repre- sents methyl or phonyl; each of R1, R2, R3 is an aliphatic radical containing 1 to 4 carbon atoms; Z is a residue of a dilithium initiator of polymerization of a vinyltrialkyl- silane, K is a residue of a monolithium initiator, which is a hydrocarbon radical selected from normal and an iso-alkyl radical; K' is hydrogen; a hydrocarbon radical or (R?) Si silcarbonic group wherein R" is a C1-C4 alkyl radical; a = 0 to 104; b - 0 to 104; c = 10 to 104; d = 10 to 104; f = 0 to 1; g = 0 to 1, x ? 1, with a molecular mass of from 103 to 106. A method for preparing said block-copolymers com- prises polymerization of vinyltrialkylsilanes in the pre- sence of mono- or dilithlumorganic initiators, whereafter a solution of a hexaorganocyclotrisiloxane is added to the reaction mixture and polymerization is effected to give in- termediate block-copolymers whereafter the polymerization is stopped or said intermediate block-copolymers are com- bined by means of a cross-linking agent, followed by recov- ery of the desired product. The block-copolymers according to the present invention feature a high selectivity of per- meation for certain gases. Thus, the ratio of permeability constants for oxygen and nitrogen (Po2/PN2) is as high as 3.5. At the same time, the absolute value of gas-permeabil- ity constants is also high, i.e. PO2 is as high as 1.4 x 10-8 cm3. cm/cm2.cm Hg.sec.
321786
Durgarian Sergei G.
Filippova Valentina G.
Gladkova Natalya K.
Nametkin Nikolai S.
Novitsky Eduard G.
Institut Neftekhimicheskogo Sinteza Imeni A.v. Topchieva Akademi
Marks & Clerk
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