Propylene-olefin copolymers and methods for making the same

Patent metadata

Field	Value
Publication number	US-10633527-B2
Application number	US-201715651323-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 70 wt % to 90 wt % of a first propylene-olefin copolymer component having an ethylene content of 15 to 21 wt %; and 10 wt % to 30 wt % of a second propylene-olefin copolymer component having an ethylene content of 6 to 10 wt %; wherein the weight average molecular weight of the first component is 250,000 to 1,780,000 g/mol higher than the weight average molecular weight of the second component; wherein the reactivity ratio product of the first component is less than 0.75; wherein the reactivity ratio product of the second component is greater than or equal to 0.75.

First claim

What is claimed is:

1. A composition comprising
(a) from about 70 wt % to about 90 wt % of a first propylene alpha-olefin copolymer component based on the weight of the composition, wherein the first component has an ethylene content of about 15 wt % to about 21 wt %; and
(b) from about 10 wt % to about 30 wt % of a second propylene alpha-olefin copolymer component based on the weight of the composition, wherein the second component has an ethylene content of about 6 wt % to about 10 wt %;
wherein the weight average molecular weight of the first component is about 250,000 to about 1,780,000 g/mol higher than the weight average molecular weight of the second component;
wherein the reactivity ratio product of the first component is less than 0.75;
wherein the reactivity ratio product of the second component is greater than or equal to 0.75; and
wherein the composition has at least one of the following properties:
(i) a tension set of less than about 15%;
(ii) a top load of less than about 8 N;
(iii) a retractive force of greater than about 3.5 N; or
(iv) a hysteresis of less than about 35%.

2. The composition of claim 1 , having:
(i) a tension set of less than about 15%;
(ii) a top load of less than about 8 N;
(iii) a retractive force of greater than about 3.5 N; and
(iv) a hysteresis of less than about 35%.

3. The composition of claim 1 , wherein the first component has a weight average molecular weight of about 400,000 to about 1,800,000 g/mol and the second component has a weight average molecular weight of about 20,000 to about 150,000 g/mol.

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

Assignees

• Exxonmobil Chemical Patents Inc

Inventors

• Norman Alexander I
• Hall Gregory K
• Hagadorn John R
• Tsou Andy H
• Jiang Peijun
• Sun ying ying
• Mattler Sarah J
• Leyva Arturo

Classifications

• C08F210/16

  Copolymers of ethene with alpha-alkenes, e.g. EP rubbers · CPC title

• C08F2500/02

  Low molecular weight, e.g. <100,000 Da. · CPC title

• C08L23/16 Primary

  Ethylene-propylene or ethylene-propylene-diene copolymers · 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

• C08F2500/01

  High molecular weight, e.g. >800,000 Da. · CPC title