SEALING COMPOSITION CONTAINING INORGANIC-ORGANIC NANOCOMPOSITE FILLER Russian patent published in 2011 - IPC C09K3/10 C08L83/04 

FIELD: construction.

SUBSTANCE: hardened sealing composition contains a) at least one diorganopolysiloxane ending with a silanol group, which has a general formula M_aD_bD'_c, where "a" has the value 2, and "b" equals or is more than 1, and "c" equals zero or a positive number; M is (HO)₃-x-yR¹xR²ySiO_1/2, where "x" has the value 0, 1 or 2, and "y" has the value of either 0, or 1, with a limiting condition that x+y is less or equal to 2, R¹ and R², each independently, are a univalent hydrocarbon group, having up to 60 atoms of carbon; D is R³R⁴SiO_2/2, where R³ and R⁴, each independently, are a univalent hydrocarbon group, having up to 60 atoms of carbon; and D' is R⁵R⁶SiO_2/2, where R⁵ and R⁶, each independently, are a univalent hydrocarbon group, having up to 60 atoms of carbon, and is charactersised with viscosity from 5000 cs to 50000 cs; b) at least one binding agent for diorganopolysiloxane (-s) ending with a silanol group, besides, the specified cross-binding agent is an alkyl silicate with a general formula (R¹⁴O)(R¹⁵O)R¹⁶O)(R¹⁷O)Si, where R¹⁴, R¹⁵, R¹⁶ and R¹⁷, each independently, are selected from univalent hydrocarbon radicals from C₁ to C₆₀; c) at least one catalyst for reaction of cross binding; d) at least one inorganic-organic nanocomposite, in amount that improves gas barrier properties, where the specified inorganic-organic nanocomposite contains at least one inorganic component, which is a material of flaky inorganic nanoparticles and at least one organic component, which is a quaternary ammonium organopolysiloxane; and, optionally, e) at least one solid polymer, having lower permeability for gas compared to permeability of cross-bound diorganopolysiloxane (-s).

EFFECT: hardened composition has low permeability for gas.

16 cl, 3 dwg, 3 tbl