Heterophasic copolymer and method for the preparation thereof

Patent metadata

Field	Value
Publication number	US-9102823-B2
Application number	US-201314104801-A
Country	US
Kind code	B2
Filing date	Dec 12, 2013
Priority date	Mar 26, 2009
Publication date	Aug 11, 2015
Grant date	Aug 11, 2015

Abstract

Methods for preparing an impact copolymer by selecting a continuous phase polymer having a first melt flow rate and selecting a rubber phase polymeric material such that the final melt flow rate of the impact copolymer is within 2 g/10 min of the first melt flow rate. Impact copolymers made from such methods and films and molded articles produced from such impact copolymers are also included.

First claim

What is claimed is:

1. A method comprising:
selecting a continuous phase polymer, wherein the continuous phase comprises a propylene homopolymer or a propylene random copolymer having a comonomer content ranging from 0.1 to 4 weight percent;
selecting a rubber phase polymeric material;
incorporating the rubber phase polymeric material into the continuous phase polymer to form an impact copolymer, wherein the impact copolymer has an Mn ranging from 25,000 to 80,000, an Mw ranging from 150,000 to 450,000, and an Mz ranging from 450,000 to 1,500,000; and
preparing an article from the impact copolymer, wherein the article is a film, and wherein a 2 mil. thick sample of the film exhibits a haze value of from 5 to 8%.

2. A method comprising:
selecting a continuous phase polymer, wherein the continuous phase comprises a propylene homopolymer or a propylene random copolymer having a comonomer content ranging from 0.1 to 4 weight percent;
selecting a rubber phase polymeric material;
incorporating the rubber phase polymeric material into the continuous phase polymer to form an impact copolymer, wherein the impact copolymer has an Mn ranging from 25,000 to 80,000, an Mw ranging from 150,000 to 450,000, and an Mz ranging from 450,000 to 1,500,000; and
preparing an article from the impact copolymer, wherein the article is a film, and wherein a 2 mil. thick sample of the film exhibits a gloss value at 45° of from 50 to 70%.

3. The method of claim 2 , wherein the rubber phase polymeric material comprises an ethylene-propylene rubber.

4. An article comprising:
an impact copolymer, wherein the impact copolymer comprises:
a continuous phase polymer, wherein the continuous phase comprises a propylene homopolymer or a propylene random copolymer having a comonomer content ranging from 0.1 to 4 weight percent; and
a rubber phase polymeric material;
wherein the impact copolymer has an Mn ranging from 25,000 to 80,000, an Mw ranging from 150,000 to 450,000, and an Mz ranging from 450,000 to 1,500,000;

wherein the article is a film, and wherein a 2 mil. thick sample of the film exhibits a haze value of from 5 to 8%.

5. The article of claim 4 , wherein the rubber phase polymeric material comprises an ethylene-propylene rubber.

6. The article of claim 4 , wherein the continuous phase polymer comprises the propylene homopolymer.

7. The article of claim 4 , wherein the continuous phase polymer comprises a random ethylene-propylene copolymer.

8. The article of claim 4 , wherein the rubber phase polymeric material comprises ethylene.

9. The article of claim 4 , wherein the rubber phase polymeric material comprises propylene.

10. The article of claim 4 , wherein the impact copolymer has a rubber phase particle size of from 0.7 to 2.7 μm.

11. An article comprising:
an impact copolymer, wherein the impact copolymer comprises:
a continuous phase polymer, wherein the continuous phase comprises a propylene homopolymer or a propylene random copolymer having a comonomer content ranging from 0.1 to 4 weight percent; and
a rubber phase polymeric material;
wherein the impact copolymer has an Mn ranging from 25,000 to 80,000, an Mw ranging from 150,000 to 450,000, and an Mz ranging from 450,000 to 1,500,000;

wherein the article is a film, and wherein a 2 mil. thick sample of the film exhibits a gloss value at 45° of from 50 to 70%.

12. The article of claim 11 , wherein the continuous phase polymer comprises the propylene random copolymer having the comonomer content ranging from 0.1 to 4 weight percent.

Assignees

• Fina Technology

Inventors

• Leland Mark

Classifications

• C08L23/142

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

• C08J2323/14

  Copolymers of propene (C08J2323/16 takes precedence) · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title

• C08L2308/00

  Chemical blending or stepwise polymerisation process with the same catalyst · CPC title

• C08L23/16

  Ethylene-propylene or ethylene-propylene-diene copolymers · CPC title