Compatibilized polyolefin blends

Patent metadata

Field	Value
Publication number	US-9752024-B2
Application number	US-201415029484-A
Country	US
Kind code	B2
Filing date	Oct 7, 2014
Priority date	Oct 15, 2013
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

A comprising includes one or more polyethylene, one or more polypropylene, one or more polyolefin elastomer, and a crystalline block composite having the following three components: (i) a crystalline ethylene based polymer, (ii) a crystalline propylene based polymer, and (iii) a block copolymer having a crystalline ethylene based block and a crystalline propylene block. The composition of component (i) is the same as the crystalline ethylene based block of the block copolymer and the composition of component (ii) is the same as the crystalline propylene block of the block copolymer. The composition is useful for forming rotomolded articles.

First claim

What is claimed is:

1. A composition, comprising:
a) one or more polyethylene different from di;
b) one or more polypropylene different from dii;
c) one or more polyolefin elastomer; and
d) a crystalline block composite comprising three components:
i) a crystalline ethylene based polymer,
ii) a crystalline propylene based polymer, and
iii) a block copolymer having a crystalline ethylene based block and a crystalline propylene block,
wherein the composition of component i) is the same as the crystalline ethylene based block of the block copolymer and the composition of component ii) is the same as the crystalline propylene block of the block copolymer, and
wherein the one or more polyolefin elastomer includes an olefin block copolymer having an ethylene/α-olefin copolymer.

2. The composition as claimed in claim 1 , wherein the block copolymer comprises from 5 wt % to 95 wt % crystalline ethylene based blocks and from 95 wt % to 5 wt % crystalline propylene blocks.

3. The composition as claimed in claim 1 , wherein the block Copolymer diii comprises from 30 to 70 wt % crystalline ethylene based blocks and 70 to 30 wt % crystalline propylene blocks.

4. The composition as claimed in claim 1 , wherein the amount of the one or more polyolefin elastomer is from 1 wt % to 45 wt %, based on a total weight of the composition.

5. The composition as claimed in claim 1 , wherein the crystalline ethylene based block includes at least 85 wt % of ethylene and the propylene based polymer is isotactic polypropylene.

6. The composition as claimed in claim 1 , wherein block copolymers include from 40 wt % to 60 wt % of crystalline propylene blocks, and a remainder of crystalline ethylene based blocks based on the total weight of the block copolymers.

7. An article prepared using the composition of claim 1 .

8. A rotomolded article prepared using the composition of claim 1 .

9. A rotomolding process performed using the composition as claimed in claim 1 .

Assignees

• Dow Global Technologies Llc

Inventors

• Barry Russell P
• Hu Yushan
• Walton Kim L
• Marchand Gary R
• Lipishan Colin
• Laakso Jr Raymond L

Classifications

• C08L23/06 Primary

  Polyethylene · CPC title

• C08L2205/035

  containing four or more polymers in a blend · CPC title

• C08L23/12 Primary

  Polypropene · CPC title

• B29C41/04

  Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould · CPC title

• C08L2205/08

  containing additives to improve the compatibility between two polymers · CPC title