# US 10,870,746 B2 · Impact modified compositions for low temperature use containers

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- Number: US 10,870,746 B2
- Document ID: US10870746B2
- Status: Granted
- Kind: B2
- Application number: 16/332,543
- Filed: 2017-09-11
- Published: 2019-07-18
- Granted: 2020-12-22
- Earliest claimed: 2016-09-12
- Assignees: Dow Global Technologies LLC
- Applicants: Dow Global Technologies LLC
- Inventors: Colin Li Pi Shan; Jihean Lee; Raymond L. Laakso, Jr.; Eddy I. Garcia-Meitin; Yushan Hu
- Web page: https://patentgrep.com/patent/US10870746B2

## CPC

- C08L 23/16: Ethylene-propylene or ethylene-propylene-diene copolymers
- C08L 23/12: Polypropene
- C08L 23/14: Copolymers of propene (C08L23/16 takes precedence)
- C08L 53/00: Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L 2205/03: containing three or more polymers in a blend
- C08L 2205/035: containing four or more polymers in a blend
- C08L 2207/02: Heterophasic composition
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

Embodiments relate to compositions comprising: (a) from 60 wt % to 90 wt % of a propylene polymer base that has a melt flow rate from 2 g/10 min to 100 g/10 min according to ASTM D1238 (230° C./2.16 kg); (b) from 2 wt % to 39.5 wt % of an olefin block copolymer; and (c) from 0.5 wt % to 20 wt % of a composite component comprising a crystalline block composite or a block composite. In certain embodiments, the composition may further comprise: (d) from 1 wt % to 30 wt % a polyolefin copolymer, the polyolefin copolymer being derived from ethylene and at least one of a C3 to C10 alpha-olefin, having a melt index from 100 g/10 min to 2000 g/10 min according to ASTM D1238 (190° C./2.16 kg), and having a density from 0.860 g/cc to 0.900 g/cc. In further embodiments, the composition may further comprise: (e) from 0.1 wt % to 5 wt % of an antioxidant.

## Claims

### Claim 1

A composition for forming a sub-ambient temperature use container, the composition comprising:
(a) from 60 wt % to 90 wt % of a propylene polymer base that has a melt flow rate from 2 g/10 min to 100 g/10 min according to ASTM D1238 (230° C./2.16 kg);
(b) from 2 wt % to 39.5 wt % of an olefin block copolymer;
(c) from 0.5 wt % to 20 wt % of a composite component comprising a crystalline block composite or a block composite; and
(d) from 1 wt % to 30 wt % a polyolefin copolymer, the polyolefin copolymer being derived from ethylene and a C3 to C10 alpha-olefin, having a melt index from 100 g/10 min to 2000 g/10 min according to ASTM D1238 (190° C./2.16 kg), and having a density from 0.860 g/cc to 0.900 g/cc.

### Claim 2 (depends on 1)

The composition of claim 1, further comprising: (e) from 0.1 wt % to 5 wt % of an antioxidant.

### Claim 3 (depends on 1)

The composition of claim 1, wherein the propylene polymer base includes a random copolymer polypropylene that has an ethylene content from 0.5 wt % to 5.0 wt %, based on the total weight of the random copolymer polypropylene.

### Claim 4 (depends on 1)

The composition of claim 1, wherein the composite component comprises a crystalline block composite, and wherein the crystalline block composite has a melt flow rate from 2 g/10 min to 10 g/10 min, according to ASTM D 1238 and at 230° C./2.16 kg, and a density from 0.890 g/cc to 0.910 g/cc according to ASTM D792.

### Claim 5 (depends on 1)

The composition of claim 1, wherein the composite component comprises a block composite, and wherein the block composite has a melt flow rate from 2 g/10 min to 10 g/10 min, according to ASTM D 1238 and at 230° C./2.16 kg, and density from 0.870 g/cc to 0.890 g/cc according to ASTM D792.

### Claim 6 (depends on 1)

An article made from the composition of claim 1, wherein the article has greater than 95% clarity and an Izod impact greater than or equal to 5 kJ/m2 at −20° C., according to ASTM D256, at a thickness of less than 3.0 mm.

### Claim 7 (depends on 1)

A freezer container formed from the composition of claim 1, wherein the container has greater than 95% clarity and an Izod impact greater than or equal to 5 kJ/m2 at −20° C., according to ASTM D256, at a thickness of less than 3.0 mm.