# US 10,308,796 B2 · Composition for low temperature use containers

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- Number: US 10,308,796 B2
- Document ID: US10308796B2
- Status: Granted
- Kind: B2
- Application number: 15/558,096
- Filed: 2016-03-07
- Published: 2018-02-22
- Granted: 2019-06-04
- Earliest claimed: 2015-03-13
- Assignees: Dow Global Technologies LLC
- Applicants: Dow Global Technologies LLC
- Inventors: Colin Li Pi Shan; Raymond L. Laakso, Jr.; Eddy I. Garcia-Meitin
- Web page: https://patentgrep.com/patent/US10308796B2

## CPC

- C08L 23/14: Copolymers of propene (C08L23/16 takes precedence)
- C08L 23/0815: {with aliphatic 1-olefins containing one carbon-to-carbon double bond}
- C08L 23/10: Homopolymers or copolymers of propene
- C08L 23/142: {at least partially crystalline copolymers of propene with other olefins}
- 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
- C08F 4/65908: {in combination with an ionising compound other than alumoxane, e.g. (C6F5)4B-X+}
- C08F 4/65912: {in combination with an organoaluminium compound}
- C08F 2410/01: Additive used together with the catalyst, excluding compounds containing Al or B
- C08F 2500/12: Melt flow index or melt flow ratio
- C08L 2205/035: containing four or more polymers in a blend
- C08L 2207/10: Peculiar tacticity
- G01N 25/4866: {by using a differential method}
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

A modifier for forming sub-ambient temperature use containers includes (a) from 20 wt % to 40 wt % of a block composite, the block composite including (i) an ethylene-propylene copolymer, (ii) an isotactic polypropylene polymer, and (iii) a block copolymer, (b) from 40 wt % to 60 wt % of 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 1500 g/10 min, according to ASTM D1238 and at 190° C./2.16 kg, and having a density from 0.860 g/cm3 to 0.900 g/cm3, and (c) optionally, from 0 wt % to 30 wt % of at least one of a first additional copolymer that has a refractive index from 1.490 to 1.510 and a second additional copolymer that is miscible with polypropylene.

## Claims

### Claim 1

A composition for forming a sub-ambient temperature use container, the composition comprising:
from 12 wt % to 30 wt % of a modifier including:
(a) from 20 wt % to 40 wt % of a block composite, based on a total weight of the modifier, the block composite including (i) an ethylene-propylene copolymer, (ii) an isotactic polypropylene polymer, and (iii) a block copolymer including an ethylene-propylene soft block that has a same composition as the ethylene-propylene polymer and an isotactic polypropylene hard block that has a same composition as the isotactic polypropylene polymer, the soft block comprising from 50 wt % to 80 wt % of ethylene based on a total weight of the soft block, and the block copolymer including from 20 wt % to 50 wt % of the hard block, based on the total weight of the block copolymer,
(b) from 40 wt % to 60 wt % of a polyolefin copolymer, based on a total weight of the modifier, the polyolefin copolymer being derived from ethylene and at least one of a C3 to C10 alpha-olefin, and the polyolefin copolymer having a melt index from 100 g/10 min to 1500 g/10 min, according to ASTM D1238 and at 190° C./2.16 kg, and a density from 0.860 g/cm3 to 0.900 g/cm3, and
(c) optionally, from 0 wt % to 30 wt % of at least one of a first additional copolymer that has a refractive index from 1.490 to 1.510 and a second additional copolymer that is miscible with polypropylene, which second additional copolymer is derived from propylene and at least one of ethylene and butene; and
from 70 wt % to 88 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 D 1238 and at 230° C./2.16 kg.

### Claim 2 (depends on 1)

The composition as claimed in 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 3 (depends on 1)

The composition as claimed in claim 1, wherein the block composite has a melt flow rate from 2 g/10 min to 100 g/10 min, according to ASTM D 1238 and at 230° C./2.16 kg.

### Claim 4 (depends on 1)

The composition as claimed in claim 1, wherein the block composite, the polyolefin copolymer, and optionally the additional copolymer of the modifier are provided in pre-blended form prior to blending the modifier with the propylene polymer base, the composition including the modifier finely dispersed in the polypropylene polymer.

### Claim 5 (depends on 1)

The composition as claimed in claim 1, wherein the first additional copolymer is present in an amount from 10 wt % to 30 wt %, the block composite is present in an amount from 25 wt % to 35 wt %, and the polyolefin elastomer is present in an amount from 45 wt % to 55 wt %.

### Claim 6 (depends on 5)

The composition as claimed in claim 5, wherein the first additional copolymer is a copolymer derived from at least two selected from ethylene, propylene, butylene, pentene, hexene, heptene, and octene, or the first additional copolymer is a styrene based copolymer.

### Claim 7 (depends on 1)

The composition as claimed in claim 1, wherein the polyolefin elastomer is derived from octene.

### Claim 8 (depends on 1)

The composition as claimed in claim 1, wherein the modifier is present in an amount greater than 15 wt %.

### Claim 9 (depends on 1)

A freezer container formed from the composition as claimed in claim 1, wherein a film formed from the composition has greater than 98% clarity, an Izod impact greater than 5 kJ/m2 at −20° C., according to ASTM D256, at a thickness of less than 3.0 mm.

### Claim 10

A method of manufacturing a sub-ambient temperature use container, the method comprising:
providing a modifier that is a blend of:
(a) from 20 wt % to 40 wt % of a block copolymer, based on a total weight of the modifier, the block copolymer including an isotactic polypropylene hard block and an ethylene-propylene soft block, the soft block comprising from 50 wt % to 80 wt % of ethylene based on a total weight of the soft block, and the block copolymer including from 20 wt % to 50 wt % of the hard block, based on the total weight of the hard block,
(b) from 40 wt % to 60 wt % of a polyolefin elastomer, based on a total weight of the modifier, the polyolefin elastomer having a melt index from 100 g/10 min to 1500 g/10 min, according to ASTM D1238 and at 190° C./2.16 kg, and a density from 0.860 g/cm3 to 0.900 g/cm3, the polyolefin elastomer being derived from at least one C3 to C10 alpha-olefin, and
(c) from 0 wt % to 30 wt % of an optional copolymer that as a refractive index from 1.490 to 1.510; and
blending from 12 wt % to 30 wt % of the modifier with 70 wt % to 88 wt % of a propylene polymer base, the propylene polymer base having a melt flow rate from 2 g/10 min to 100 g/10 min, according to ASTM D 1238 and at 230° C./2.16 kg.