09-01-2020 дата публикации
Номер: US20200010719A1
Принадлежит:
Isocyanate-terminated chain-extended polythioether prepolymers, compositions thereof, and methods of use thereof are disclosed. The isocyanate-terminated chain-extended polythioether prepolymers are useful in sprayable coatings and sealants and especially sprayable coatings and sealants having a high filler content. 1. An isocyanate-terminated chain-extended polythioether prepolymer comprising reaction products of reactants , wherein the reactants comprise:a thiol-terminated polythioether, a hydroxyl-terminated polythioether, or a combination thereof;a diisocyanate;a diisocyanate trimer; anda non-linear short chain diol.2. The prepolymer of claim 1 , wherein the thiol-terminated polythioether claim 1 , the hydroxyl-terminated polythioether claim 1 , or both the thiol-terminated polythioether and the hydroxyl-terminated polythioether comprise a moiety having the structure of Formula (2):{'br': None, 'sup': 1', '1, 'sub': 'n', '—S—R—[S-A-S—R—]—S—\u2003\u2003(2)'} n is an integer from 1 to 60;', {'sup': 1', '3', '3, 'sub': 2-10', '6-8', '6-14', '5-8', 'p', 'q', 'r, 'each Ris independently selected from Calkanediyl, Ccycloalkanediyl, Calkanecycloalkanediyl, Cheterocycloalkanediyl, and —[(CHR)—X—](CHR)—;'}, 'p 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, S—S, and NR, wherein R is selected from hydrogen and methyl; and', [{'br': None, 'sub': 2', 'm', '2, 'sup': '2', 'CH═CH—O—(R—O)—CH═CH\u2003\u2003(3)'}, {'br': None, 'sup': 2', '20, 'sub': 2', 'z, 'B(—R—CH═CH)\u2003\u2003(4)'}], 'each A is independently a moiety derived from a polyvinyl ether of Formula (3) and a moiety derived from a polyalkenyl polyfunctionalizing agent of Formula (4)], 'wherein,'} m is an integer from 0 to 50;', {'sup': 2', '3', '3', '3', '1, 'sub': 1-10', '6-8', '6-14', 'p', 'q', 'r, 'each Ris independently selected from ...
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