Patent ID: 11952481
Assignee: BOREALIS AG
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A heterophasic polypropylene composition comprising a polymer base resin which comprises a matrix phase and an elastomeric phase dispersed therein, wherein the matrix phase and the elastomeric phase are polymerized in the presence of a single-site catalyst; and
wherein the polymer base resin comprises:
(A) from 20 to 55 wt % of a crystalline fraction (CF), measured by Crystex QC in trichlorobenzene, which is a propylene homopolymer fraction or a copolymer fraction of propylene monomer units and comonomer units of ethylene or alpha-olefins with 4 to 12 carbon atoms with an amount of comonomer units of up to 6.0 wt %; and
(B) from 45 to 80 wt % of a soluble fraction (SF), measured by Crystex QC in trichlorobenzene, which is a copolymer of propylene monomer units and comonomer units of ethylene or alpha-olefins with 4-12 carbon atoms, with an amount of comonomer units of from 17 to 55 wt % and an intrinsic viscosity iV of from 1.2 to 7.0 dl/g,
wherein the heterophasic polypropylene composition has a tensile modulus of not more than 700 MPa and a total viscosity iV of from 1.2 to 7.0 dl/g.