30-04-2015 дата публикации
Номер: US20150119549A1
Sulfur-containing polymer adducts such as polythioethers, polysulfides, and sulfur-containing polyformals having terminal maleimide groups, and in particular, sulfur-containing polymers and sulfur containing adducts having terminal 1,1′-(methylenedi-4,1-phenylene)bismaleimide groups are disclosed. The adducts provide cured sealants having improved tensile strength and elongation and are useful as aerospace sealants. 1. A sulfur-containing maleimide adduct comprising at least two terminal maleimide groups.2. The adduct of claim 1 , wherein the sulfur-containing maleimide adduct comprises a polythioether claim 1 , a polysulfide claim 1 , sulfur-containing polyformal claim 1 , or a combination of any of the foregoing.3. The adduct of claim 1 , wherein the adduct comprises a polythioether maleimide adduct of Formula (8a) claim 1 , a polythioether maleimide adduct of Formula (8b) claim 1 , or a combination thereof:{'br': None, 'sup': 6', '1', '2', '1', '6, 'sub': 2', 'p', 'm', '2', '2', 'n, 'R—S—R—[—S—(CH)—O—(R—O)—(CH)—S—R—]—S—R\u2003\u2003(8a)'}{'br': None, 'sup': 6', '1', '2', '1, 'sub': 2', 'p', 'm', '2', '2', 'n', 'z, '{R—S—R—[—S—(CH)—O—(R—O)—(CH)—S—R—]—S—V′—}B\u2003\u2003(8b)'} [{'sup': 1', '3', '3, 'sub': 2-10', '6-8', '6-10', '5-8', 's', 'q', 'r, 'claim-text': s is an integer from 2 to 6;', 'q is an integer from 1 to 5;', 'r is an integer from 2 to 10;', {'sup': '3', 'each Ris 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 Rindependently comprises Calkanediyl, Ccycloalkanediyl, Calkanecycloalkanediyl, Cheterocycloalkanediyl, and/or —[(—CHR—)—X—]—(—CHR—)—, wherein, {'sup': 2', '3', '3', '3', '1, 'sub': 1-10', '6-8', '6-14', 's', 'q', 'r, 'each Rindependently comprises Calkanediyl, Ccycloalkanediyl, Calkanecycloalkanediyl, and —[(—CHR—)—X—]—(—CHR—)—, wherein s, q, r, R, and X are as defined for R;'}, 'm is an integer from 0 to 50;', 'n is an ...
Подробнее
