US 12,378,419 B2
Aqueous polymer latex
Roelof Balk, Boehl-Iggelheim (DE); Bastiaan Lohmeijer, Ludwigshafen am Rhein (DE); and Robert Wrazidlo, Ludwigshafen am Rhein (DE)
Assigned to BASF SE, Ludwigshafen am Rhein (DE)
Appl. No. 17/608,649
Filed by BASF SE, Ludwigshafen am Rhein (DE)
PCT Filed May 7, 2020, PCT No. PCT/EP2020/062671
§ 371(c)(1), (2) Date Nov. 3, 2021,
PCT Pub. No. WO2020/225348, PCT Pub. Date Nov. 12, 2020.
Claims priority of application No. 19173298 (EP), filed on May 8, 2019.
Prior Publication US 2022/0235229 A1, Jul. 28, 2022
Int. Cl. C09D 5/02 (2006.01); C08F 220/18 (2006.01); C08K 3/22 (2006.01); C09D 7/61 (2018.01); C09D 133/06 (2006.01)
CPC C09D 5/022 (2013.01) [C08F 220/1808 (2020.02); C08K 3/22 (2013.01); C09D 7/61 (2018.01); C09D 133/064 (2013.01); C08K 2003/2241 (2013.01); C08K 2003/2296 (2013.01)] 19 Claims
 
1. An aqueous polymer latex of a film-forming copolymer obtainable by aqueous emulsion polymerisation of monomers M, which comprise at least 80% by weight, based on the monomers M, of
at least one non-ionic monomer M1, which is selected from C1-C20-alkyl esters of acrylic acid, C5-C20-cycloalkyl esters of acrylic acid, C1-C20-alkyl esters of methacrylic acid, C5-C20-cycloalkyl esters of methacrylic acid, and monovinyl aromatic monomers; and
one or more monoethylenically unsaturated monomers M2, which are selected from monoethylenically unsaturated monocarboxylic acids having 3 to 6 carbon atoms and monoethylenically unsaturated dicarboxylic acids having 4 to 6 carbon atoms;
where the polymer latex contains an emulsifier combination comprising
i. at least one first emulsifier (1), which is selected from salts of sulfated ethoxylated C8-C20-alkanols having a degree of ethoxylation in the range from 5 to 20 and sulfated ethoxylated tristyrylphenols having a degree of ethoxylation in the range from 5 to 20; and
ii. at least one second emulsifier (2), which is selected from salts of a sulfated ethoxylated C8-C20-alkanol having a degree of ethoxylation in the range from 21 to 50 and sulfated ethoxylated tristyrylphenols having a degree of ethoxylation in the range from 21 to 50;
wherein the aqueous polymer latex comprises a first phase of a film-forming copolymer, which has a glass transition temperature Tg(1) in the range from −25 to +60° C. and a second phase of a film-forming copolymer, which has a glass transition temperature Tg(2) in the range from +50 to +150° C., provided that the absolute value of |Tg(2)−Tg(1)| is at least 10° C.