Thermoplastic vulcanizate with crosslinked olefin block copolymer

Patent metadata

Field	Value
Publication number	US-9670353-B2
Application number	US-201214651967-A
Country	US
Kind code	B2
Filing date	Dec 31, 2012
Priority date	Dec 31, 2012
Publication date	Jun 6, 2017
Grant date	Jun 6, 2017

Abstract

The present disclosure provides a composition comprising or obtained from a reaction mixture comprising a first propylene-based polymer, an olefin block copolymer, and a cure component. The cure component comprises (i) a second propylene/α-olefin copolymer, (ii) a scorch retardant, and (iii) a crosslinking agent.

First claim

The invention claimed is:

1. A thermoplastic vulcanizate composition comprising:
a polymeric composition consisting of a continuous phase, a discontinuous phase, and a compatibilizer;
the continuous phase consisting of a first propylene-based polymer consisting of propylene and ethylene;
the discontinuous phase dispersed in the continuous phase, the discontinuous phase consisting of a crosslinked ethylene/α-olefin multi-block copolymer consisting of ethylene and octene;
the compatibilzer consisting of a second propylene-based polymer different than the first propylene-based polymer and consisting of propylene and ethylene;
the polymeric composition consisting of
from 5 wt % to 50 wt % of the first propylene-based polymer;
from 15 wt % to 76 wt % of the crosslinked multi-block copolymer; and
from 1 wt % to 40 wt % of the second propylene-based polymer that has a density that is different than the density of the first propylene-based polymer; and
the thermoplastic vulcanizate composition is void of an ethylene-propylene-diene monomer rubber.

2. The thermoplastic vulcanizate composition of claim 1 having a tensile strength from 4 MPa to 20 MPa.

3. The thermoplastic vulcanizate composition of claim 1 having an elongation at break from 200% to 900%.

Assignees

• Dow Global Technologies Llc

Inventors

• Peng Shuwen
• Sun Yabin
• Soediono Mahalia
• Lai Shih-Yaw

Classifications

• C08K5/3435

  Piperidines · CPC title

• C08L2312/00

  Crosslinking · CPC title

• C08L53/00 Primary

  Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title

• C08L2205/035

  containing four or more polymers in a blend · CPC title