US 12,325,810 B2
Water-based composition with chemical cross-linking
Steffen Maier, Wettingen (CH); Nestor Failache, Buenos Aires (AR); and Michael Schlumpf, Stallikon (CH)
Assigned to SIKA TECHNOLOGY AG, Baar (CH)
Appl. No. 17/053,164
Filed by SIKA TECHNOLOGY AG, Baar (CH)
PCT Filed Jul. 1, 2019, PCT No. PCT/EP2019/067528
§ 371(c)(1), (2) Date Nov. 5, 2020,
PCT Pub. No. WO2020/007765, PCT Pub. Date Jan. 9, 2020.
Claims priority of application No. 18181732 (EP), filed on Jul. 4, 2018.
Prior Publication US 2021/0130665 A1, May 6, 2021
Int. Cl. C09J 175/08 (2006.01); C08G 18/08 (2006.01); C08G 18/12 (2006.01); C08G 18/32 (2006.01); C08G 18/34 (2006.01); C08G 18/48 (2006.01); C08G 18/75 (2006.01); C08G 18/76 (2006.01)
CPC C09J 175/08 (2013.01) [C08G 18/0823 (2013.01); C08G 18/12 (2013.01); C08G 18/3256 (2013.01); C08G 18/348 (2013.01); C08G 18/4812 (2013.01); C08G 18/4825 (2013.01); C08G 18/4837 (2013.01); C08G 18/755 (2013.01); C08G 18/7621 (2013.01)] 13 Claims
 
1. A single-component sealant or adhesive composition, comprising:
a) an aqueous polymer dispersion comprising water and at least one water-dispersed polymer P,
b) at least one water-dispersed or water-dissolved isocyanate-functional cross-linker C with a nominal isocyanate-functionality of at least 2, and
c) an aldimine of formula (I)

OG Complex Work Unit Chemistry
where A is the rest of an amine after removal of n primary amino groups and m HX groups; n is 1 or 2 or 3 or 4; m is 0 or 1 or 2 or 3 or 4, with the provision that m+n is 2 or 3 or 4; R1 and R2 are either each independently a monovalent hydrocarbon radical with 1 to 12 C atoms or together form a divalent hydrocarbon radical with 4 to 12 C atoms that is part of an optionally substituted carbocyclic ring with 5 to 8 C atoms; R3 is a hydrogen atom or an alkyl-, cycloalkyl-, arylalkyl-, or alkoxycarbonyl radical with 1 to 12 C atoms; R4 is a hydrogen atom or a monovalent radical with 1 to 20 C atoms selected from alkyl-, cycloalkyl-, arylalkyl-, aryl-, —OR5′, —SR5′, and —NR5′R5″, wherein R5′ and R5″ either each independently are hydrocarbon radicals or together form an alkylene radical that is part of a 5-, 6-, or 7-membered ring; and X is O or S or NR6, wherein R6 is a hydrocarbon radical with 1 to 20 C atoms which is optionally substituted with a carbonic acid ester-, nitrile-, nitro-, phosphonic acid ester-, sulphone-, or sulphonic acid ester-group,
wherein the at least one water-dispersed polymer P has functional groups selected from carboxylic acid groups, amino groups, and hydroxyl groups, and
wherein the isocyanate-functional cross-linker C is a polyurethane polymer containing isocyanate groups having a number average molecular weight in a range of 2,000 to 15,000 g/mol, and
wherein the composition comprises between 0.1 and 50 parts by weight of the isocyanate-functional cross-linker C per 100 parts by weight of the at least one water-dispersed polymer P.