Propylene-alpha olefin copolymers and methods for making the same

Patent metadata

Field	Value
Publication number	US-10633526-B2
Application number	US-201715651547-A
Country	US
Kind code	B2
Filing date	Jul 17, 2017
Priority date	Aug 15, 2016
Publication date	Apr 28, 2020
Grant date	Apr 28, 2020

Abstract

Provided is a composition having 60 wt % to 95 wt % of a first propylene alpha-olefin copolymer component having a reactivity ratio product of less than 0.75 and a weight average molecular weight of greater than about 450,000 g/mol; and 5 wt % to 40 wt % of a second propylene alpha-olefin copolymer component having a reactivity ratio of greater than 1.5 and a weight average molecular weight of less than about 215,000 g/mol.

First claim

What is claimed is:

1. A composition comprising
(a) from about 60 wt % to about 95 wt % of a first propylene alpha-olefin copolymer component having a reactivity ratio product of less than 0.75 and a weight average molecular weight of greater than about 450,000 g/mol; and
(b) from about 5 wt % to about 40 wt % of a second propylene-alpha olefin copolymer component having a reactivity ratio product of greater than 1.5 and a weight average molecular weight of less than about 215,000 g/mol;

wherein the composition has at least one of the following properties:
(i) a tension set of less than about 12%;
(ii) a top load of less than about 7 N; or
(iii) a hysteresis of less than about 30%.

2. The composition of claim 1 , having:
(i) a tension set of less than about 12%;
(ii) a top load of less than about 7 N; and
(iii) a hysteresis of less than about 30%.

3. The composition of claim 1 , wherein the alpha-olefin of the first component is ethylene and the alpha-olefin of the second component is ethylene.

4. A personal hygiene material, packaging material, or film, comprising the composition according to claim 1 .

Assignees

• Exxonmobil Chemical Patents Inc

Inventors

• Tsou Andy H
• Norman Alexander I
• Hagadorn John R
• Kiss Gabor
• Jiang Peijun
• Mattler Sarah J

Classifications

• 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

• C08L2207/066

  LDPE (radical process) · CPC title

• C08L23/142 Primary

  at least partially crystalline copolymers of propene with other olefins · CPC title

• C08F4/65908

  in combination with an ionising compound other than alumoxane, e.g. (C6F5)4B-X+ · CPC title

• C08L2314/06

  Metallocene or single site catalysts · CPC title