	US 12,152,099 B2
	Polyacrylate graft rubber copolymer and impact modified thermoplastic molding composition
Tobias Schulz, Cologne (DE); Wolfgang Fischer, Heidelberg (DE); Norbert Niessner, Friedelsheim (DE); Christian Ruthard, Mainz (DE); and Hannes Kerschbaumer, Bad Soden am Taunus (DE)
Assigned to INEOS STYROLUTION GROUP GMBH, Frankfurt am Main (DE)
Appl. No. 17/262,018
Filed by INEOS STYROLUTION GROUP GMBH, Frankfurt am Main (DE)
PCT Filed Jul. 22, 2019, PCT No. PCT/EP2019/069693 § 371(c)(1), (2) Date Jan. 21, 2021, PCT Pub. No. WO2020/020831, PCT Pub. Date Jan. 30, 2020.
Claims priority of application No. 18185186 (EP), filed on Jul. 24, 2018.
Prior Publication US 2021/0292459 A1, Sep. 23, 2021
Int. Cl. C08F 257/02 (2006.01); C08F 2/22 (2006.01); C08F 212/08 (2006.01); C08F 220/44 (2006.01); C08F 265/06 (2006.01); C08L 25/12 (2006.01); C08L 33/20 (2006.01); C08L 51/04 (2006.01)

CPC C08F 257/02 (2013.01) [C08F 2/22 (2013.01); C08F 212/08 (2013.01); C08F 220/44 (2013.01); C08F 265/06 (2013.01); C08L 25/12 (2013.01); C08L 33/20 (2013.01); C08L 51/04 (2013.01); C08L 2207/53 (2013.01)]

18 Claims

1. A graft copolymer B composed of:

B1: 50 to 70 wt.-%, based on B, of at least one graft base B1 obtained by emulsion polymerization of the following monomers:

i. b11: 70 to 99.9 wt.-%, based on B1, of at least one acrylate;

ii. b12: 0 to 29.9 wt.-%, based on B1, of at least one further comonomer selected from: styrene, α-methylstyrene, acrylonitrile, methacrylonitrile, methylmethacrylate, and N-phenylmaleimide (N-PMI); and

iii. b13:0.1 to 10 wt.-%, based on B1, of one or more bi- or polyfunctional, crosslinking monomers;

where the sum of b11, b12 and b13 adds up to 100 wt.-%; and

B2: 30 to 50 wt.-%, based on B, of a graft shell B2, which is obtained via emulsion polymerization in the presence of at least one graft base B1, which graft shell B2 comprises a first layer B21 made of at least one vinylaromatic monomer, and a second layer B22 made of a mixture comprising at least one vinylaromatic monomer B21-1 and at least one nitrile monomer B22-2;

where the sum of B1 and B2 adds up to 100 wt.-%;

wherein:

i. the weight average particle diameter d_wof the graft base B1 is in the range of from 255 to 290 nm;

ii. the fraction of B21, based on the total amount of B2, is 10 to 26 wt.-%; and

iii. the amount of B22-2, based on the total amount of B22, is 20 to 30 wt.-%.