MALEIMIDE-TERMINAL SULPHUR-CONTAINING POLYMERS, COMPOSITIONS WITH SAME AND USE THEREOF Russian patent published in 2018 - IPC C08G75/02 C08L81/02 C09K3/10 

FIELD: chemistry.

SUBSTANCE: present invention relates to maleimide-terminated sulphur-containing polymers, such as maleimide-terminal polythioesters and to sealant compositions containing same. Sulphur-containing maleimide adduct containing a polythioester maleimide adduct of Formula (8a), a polythioester maleimide adduct of Formula (8b) or a combination thereof is described: R⁶-S-R¹-[-S-(CH₂)_p-O-(R²-O)_m-(CH₂)₂-S-R¹-]_n-S-R⁶ (8a), {R⁶-S-R¹-[-S-(CH₂)_p-O-(R²-O)_m-(CH₂)₂-S-R¹-]_n-S-V’-}_zB (8b), where each R¹ is independently C_2-10 alkanediyl, C_6-8 cycloalkanediyl, C_6-10 alkanecycloalkanediyl, C_5-8 heterocycloalkanediyl and/or -[(-CHR³-)_s-X-]_q-(-CHR³-)_r-, where s is an integer from 2 to 6; q is an integer from 1 to 5; r is an integer from 2 to 10; each R³ is independently selected from hydrogen and methyl; and each X is independently selected from -O-, -S- and -NR-, wherein R is selected from hydrogen and methyl; each R² is independently C_1-10 alkanediyl, C_6-8 cycloalkanediyl, C_6-14 alkanecycloalkanediyl and -[(-CHR³-)_s-X-]_q-(-CHR³-)_r-, where s, q, r, R³ and X correspond to the definitions given for R¹; m is an integer from 0 to 50; n is an integer from 1 to 60; p is an integer from 2 to 6; B is the core of the z-valent, vinyl-terminal polyfunctionalising agent B (-V)_z, wherein z is an integer from 3 to 6; and each V is a group containing a group capable of reacting with thiol groups; and each -V'- is formed by the reaction of -V with a thiol; and each R⁶ contains 1-(4-(4-(3-yl-2,5-dioxopyrrolidin-1-yl)benzyl)phenyl)-1H-pyrrole-2,5-dione group. Said adduct is also described, in which R⁶ contains a maleimide-terminal fragment, which is formed by the reaction of the thiol group and bismaleimide, wherein the bismaleimide comprises 1,1'-(methylenedi-4,1-phenylene)-bismaleimide, 2,4-dimaleimidotoluene, N, N'-1,3-phenylene dimaleimide, O-phenylene dimaleimide, N, N'-1,4-phenylene dimaleimide, 1,1'-(2-methyl-1,3-phenylene)bis(1H-pyrrole-2,5-dione), 1,1'-biphenyl-4,4'-diylbis(1H-pyrrole-2,5-dione), or a combination of any of the above. Also, sealing compositions containing said adducts are described.

EFFECT: technical result is the formation of cured sealants having improved tensile strength and elongation.

11 cl, 4 ex