# US 9,752,024 B2 · Compatibilized polyolefin blends

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- Number: US 9,752,024 B2
- Document ID: US9752024B2
- Status: Granted
- Kind: B2
- Application number: 15/029,484
- Filed: 2014-10-07
- Published: 2016-09-15
- Granted: 2017-09-05
- Earliest claimed: 2013-10-15
- Assignees: Dow Global Technologies LLC
- Applicants: Dow Global Technologies LLC
- Inventors: Russell P. Barry; Yushan Hu; Kim L. Walton; Gary R. Marchand; Colin LiPiShan; Raymond L. Laakso, Jr.
- Web page: https://patentgrep.com/patent/US9752024B2

## CPC

- C08L 23/12: Polypropene
- B29C 41/003: {characterised by the choice of material}
- B29C 41/04: Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould
- C08L 23/06: Polyethylene
- B29K 2023/12: {PP, i.e. polypropylene}
- C08L 2205/03: containing three or more polymers in a blend
- C08L 2205/035: containing four or more polymers in a blend
- C08L 2205/08: containing additives to improve the compatibility between two polymers
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS

## 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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 1)

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.

### Claim 5 (depends on 1)

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.

### Claim 6 (depends on 1)

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.

### Claim 7 (depends on 1)

An article prepared using the composition of claim 1.

### Claim 8 (depends on 1)

A rotomolded article prepared using the composition of claim 1.

### Claim 9 (depends on 1)

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