US 12,247,122 B2
Polycarbonate blend having reduced disturbing noise
Kristina Pupovac, Düsseldorf (DE)
Assigned to Covestro Deutschland AG, Leverkusen (DE)
Appl. No. 17/996,636
Filed by Covestro Deutschland AG, Leverkusen (DE)
PCT Filed May 11, 2021, PCT No. PCT/EP2021/062398
§ 371(c)(1), (2) Date Oct. 20, 2022,
PCT Pub. No. WO2021/233727, PCT Pub. Date Nov. 25, 2021.
Claims priority of application No. 20175182 (EP), filed on May 18, 2020.
Prior Publication US 2023/0220196 A1, Jul. 13, 2023
Int. Cl. C08L 69/00 (2006.01); B29C 48/00 (2019.01); C08F 2/02 (2006.01); C08F 2/22 (2006.01); C08F 220/18 (2006.01); C08F 279/04 (2006.01); C08J 3/12 (2006.01); C08J 3/22 (2006.01); C08L 23/0869 (2025.01); C08L 51/04 (2006.01); C08L 55/02 (2006.01); C08L 83/04 (2006.01)
CPC C08L 69/00 (2013.01) [B29C 48/022 (2019.02); C08F 2/02 (2013.01); C08F 2/22 (2013.01); C08F 220/1804 (2020.02); C08F 279/04 (2013.01); C08J 3/12 (2013.01); C08J 3/226 (2013.01); C08L 23/0869 (2013.01); C08L 51/04 (2013.01); C08L 55/02 (2013.01); C08L 83/04 (2013.01); C08L 2203/30 (2013.01); C08L 2205/025 (2013.01); C08L 2205/035 (2013.01)] 13 Claims
 
1. A thermoplastic molding compound containing
A) at least one polymer selected from the group consisting of polycarbonate and polyester carbonate,
B) a polymer containing
B1) at least one rubber-modified vinyl (co) polymer containing
B1.1) 80% to 95% by weight, based on B.1, of at least one vinyl monomer and
B1.2) 5% to 20% by weight, based on B1, of one or more elastomeric polybutadiene-containing graft substrates,
wherein B1
contains polybutadiene-containing rubber particles grafted with the vinyl monomers B1.1
which contain inclusions of vinyl (co) polymer consisting of the vinyl monomers B1.1 and
a vinyl (co) polymer matrix consisting of the vinyl monomers B1.1 which is not bonded to these rubber particles and not included in rubber particles,
wherein component B1 is a mixture of two rubber-modified vinyl (co) polymers and wherein in the first of these rubber-modified vinyl (co) polymers the vinyl monomer B.1.1 is a mixture of styrene and acrylonitrile and wherein in the second of these rubber-modified vinyl (co) polymers, the vinyl monomer B.1.1 is a mixture of styrene, acrylonitrile and butyl acrylate, and
B2 further rubber particles grafted with vinyl monomers composed of
B2.1) 5% to 75% by weight, based on B.2, of at least one vinyl monomer and
B2.2) 25% to 95% by weight, based on B2, of one or more elastomeric graft substrates,
wherein the weight ratio of component B1) to B2) is at least 5:1,
C) a masterbatch solid at room temperature containing
C1) one or more copolymers containing structural units derived from an olefin and structural units derived from a polar comonomer,
C2) a vulcanized silicone elastomer.