	US 12,065,526 B2
	Process for the preparation of polyalkyl (meth)acrylate polymers
Katrin Schöller, Bad Soden (DE); Sarah Lippert, Darmstadt (DE); Wolfgang Tschepat, Darmstadt (DE); and Fabian Ziegler, Darmstadt (DE)
Assigned to Evonik Operations GmbH, Essen (DE)
Appl. No. 17/997,231
Filed by Evonik Operations GmbH, Essen (DE)
PCT Filed Apr. 28, 2021, PCT No. PCT/EP2021/061055 § 371(c)(1), (2) Date Oct. 26, 2022, PCT Pub. No. WO2021/219686, PCT Pub. Date Nov. 4, 2021.
Claims priority of application No. 20172360 (EP), filed on Apr. 30, 2020.
Prior Publication US 2023/0174695 A1, Jun. 8, 2023
Int. Cl. C08F 220/18 (2006.01); C10M 145/14 (2006.01); C10N 20/02 (2006.01); C10N 20/04 (2006.01); C10N 30/00 (2006.01)

CPC C08F 220/18 (2013.01) [C10M 145/14 (2013.01); C10M 2203/1025 (2013.01); C10M 2209/084 (2013.01); C10N 2020/02 (2013.01); C10N 2020/04 (2013.01); C10N 2030/68 (2020.05)]

17 Claims

1. A method for the preparation of a polyalkyl (meth)acrylate polymer having a weight-average molecular weight in a range of 100,000 to 1,000,000 g/mol and comprising the following monomers:

(a) 8 to 25% by weight of at least one ester of (meth)acrylic acid and hydroxylated hydrogenated polybutadiene;

(b1) 60% to 80% by weight of at least one C_1-4alkyl (meth)acrylate;

(b2) 10% to 20% by weight of at least one C_10-30alkyl (meth)acrylate; and

(b3) 0% to 10% by weight of styrene;

based on a total amount of the polyalkyl (meth)acrylate polymer,

the method comprising:

(i) preparing a monomer mixture 1 comprising 115 to 125% of a targeted content of monomer 1(a) and 95% to 100% of a targeted content of monomers (b1) to (b3), a concentration of the monomers (a) to (b3) in monomer mixture 1 being 30 to 40%;

(ii) adding a monomer mixture 2 comprising 115 to 125% of the targeted content of monomer (a) and 95% to 100% of the targeted content of monomers (b1) to (b3), a concentration of the monomers (a) to (b3) in monomer mixture 2 being 30 to 40%; and

(iii) adding a monomer mixture 3 comprising 110 to 120% of the targeted content of only monomers (b1) to (b3), the concentration of the monomers (b1 to (b3) in monomer mixture 3 being 2 to 6%,

wherein monomer mixture 1 comprises 38 to 45% of a total amount of monomers used in the method, monomer mixture 2 comprises 38 to 45% of the total amount of monomers used in the method, and monomer mixture 3 comprises 15 to 20% of the total amount of monomers used in the method.