METHOD FOR PRODUCING PHENYLSYLSESQUIOXANE BLOCK COPOLYMERS

WIPO Patent Application WO/1999/046317

A1

The present invention relates to a method for producing phenylsylsesquioxane block copolymers, wherein said method uses a dual-function oligodiorganylsiloxane (DO) of the formula: X(R?1¿R?2¿SiO)¿$i(p)?SiR?1¿R?2¿X, wherein R?1¿ and R?2¿ represent aliphatic radicals comprising from 1 to 4 carbon atoms or phenyl, $i(p) represents an integer from 10 to 300 and X represents Cl, R?3¿O or R?4¿C(O)O in which R?3¿ is CH¿3?, C¿2?H¿5? or C¿3?H¿7? while R?4¿ is CH¿3? or C¿2?H¿5?. The dual-function oligodiorganylsiloxane is mixed with a phenyltrichlorosilane (PHEN) in an organic solvent (OS) in a proportion that ranges from 10 to 100 moles of PHEN for 1 mole of DO. The solution thus obtained is then mixed with an aqueous solution having a non-organic base. The organic portion is further removed from the reaction mixture before extracting from said portion a block copolymer having a viscosity of between 10 and 300 P at 20° C.

MILESHKEVICH VLADIMIR PETROVIT (RU)
SEMENKOVA NATALIYA JURIEVNA (RU)
MAKARENKO IGOR ANATOLIEVICH (RU)
KOZODAEVA NATALIYA MIKHAILOVNA (RU)
KOZODAEVA MARINA MIKHAILOVNA (RU)
GULKO PETER (US)

PCT/RU1998/000073

September 16, 1999

March 12, 1998

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EURO ASIAN PHYSICAL SOCIETY (RU)
MILESHKEVICH VLADIMIR PETROVIT (RU)
SEMENKOVA NATALIYA JURIEVNA (RU)
MAKARENKO IGOR ANATOLIEVICH (RU)
KOZODAEVA NATALIYA MIKHAILOVNA (RU)
KOZODAEVA MARINA MIKHAILOVNA (RU)
GULKO PETER (US)

C08G77/44; (IPC1-7): C08G77/06; C08G77/42

WO1997044380A1

1997-11-27

SU1137099A1

1985-01-30

USPEKHI OBLASTI SINTEZA ELEMENTOORGANICHESKIKH POLIMEROV, Under Editorship V.V. KORSHAKA, M. NAUKA, 1988, pages 171-173.

Patent, Law Firm 'JUS' (Moscow, 9, RU)

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