# US 11,299,609 B2 · Blends of linear low density polyethylenes

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- Number: US 11,299,609 B2
- Document ID: US11299609B2
- Status: Granted
- Kind: B2
- Application number: 16/612,072
- Filed: 2018-05-29
- Published: 2020-05-07
- Granted: 2022-04-12
- Earliest claimed: 2017-05-31
- Assignees: Univation Technologies, LLC
- Applicants: Univation Technologies, LLC
- Inventors: Swapnil B. Chandak; Nitin Borse
- Web page: https://patentgrep.com/patent/US11299609B2

## CPC

- C08L 23/0815: {with aliphatic 1-olefins containing one carbon-to-carbon double bond}
- C08J 3/203: {Solid polymers with solid and/or liquid additives}
- C08J 5/18: Manufacture of films or sheets
- C08J 2323/06: Polyethene
- C08J 2423/06: Polyethene
- C08L 2203/16: used for films
- C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
- C08L 2207/066: LDPE (radical process)
- C08L 2207/07: Long chain branching
- C08L 2314/02: Ziegler natta catalyst
- C08L 2314/06: Metallocene or single site catalysts
- Y02P 20/52: using catalysts, e.g. selective catalysts
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A polyethylene blend comprising a uniform dispersion of constituents (A) and (B): (A) a Ziegler-Natta catalyst-made linear low density polyethylene and (B) a metallocene catalyst-made linear low density polyethylene, a composition comprising the polyethylene blend and at least one additive, methods of making and using same, and manufactured articles and films comprising or made from same.

## Claims

### Claim 1

A polyethylene blend comprising a uniform dispersion of constituents (A) and (B): (A) a Ziegler-Natta catalyst-made linear low density polyethylene (ZN-LLDPE) and (B) a metallocene catalyst-made linear low density polyethylene (MCN-LLDPE); wherein the (A) ZN-LLDPE is from 25 to 50 weight percent (wt %) of the total weight of (A) and (B) and the (B) MCN-LLDPE is from 75 to 50 wt % of the total weight of (A) and (B); wherein by itself (A) independently has each of properties (i) to (iii): (i) a melt index (“I2”, 190° C., 2.16 kg) of 0.9 to 1.1 gram per 10 minutes (g/10 min.) measured according to ASTM D1238-04; (ii) a density of 0.918±0.003 gram per cubic centimeter (g/cm3), measured according to ASTM D792-13; and (iii) no detectable amount of long chain branching per 1,000 carbon atoms (“LCB Index”), measured according to LCB Test Method; and wherein by itself (B) independently has each of properties (i) to (iii): (i) a melt index (“I2”, 190° C., 2.16 kg) of 0.9 to 1.1 g/10 min. measured according to ASTM D1238-04; (ii) a density of 0.918±0.003 g/cm3, measured according to ASTM D792-13; and (iii) no detectable amount of long chain branching per 1,000 carbon atoms (“LCB Index”), measured according to LCB Test Method; and with the proviso that the density of constituent (B) is within ±0.001 g/cm3 of the density of constituent (A); wherein the (A) ZN-LLDPE is made by copolymerizing ethylene and 1-hexene in the presence of the Ziegler-Natta catalyst and the (B) MCN-LLDPE is made by copolymerizing ethylene and 1-hexene in the presence of the metallocene catalyst; and
wherein the melt index (“I2”, 190° C., 2.16 kg) of constituent (B) is within ±0.1 g/10 min. of the melt index (“I2”, 190° C., 2.16 kg) of constituent (A); and
wherein when formed as a film having a thickness of 0.0127 millimeter the film has a puncture resistance, measured according to ASTM D5748-95(2012), of at least 24.8 Joules per cubic centimeter (J/cm3).

### Claim 2 (depends on 1)

The polyethylene blend of claim 1, when formed as the film having a thickness of 0.0127 millimeter (0.500 mil), has an increase in film puncture resistance, relative to film puncture resistance of (A) or (B) alone, of from 0.50% to 50%, all when tested according to ASTM D5748-95(2012).

### Claim 3 (depends on 1)

A method of making the polyethylene blend of claim 1, the method comprising: (a) contacting discrete solid particles and/or a discrete melt of constituent (A) with discrete solid particles and/or a discrete melt of constituent (B) to give an initial mixture of (A) and (B); (b) heating any solid particles of (A) and any solid particles of (B) in the initial mixture above their melting temperature to give a complete melt of constituents (A) and (B); (c) blending the complete melt to an even extent to give the polyethylene blend as a uniform melt blend of constant composition of (A) and (B) throughout.

### Claim 4 (depends on 3)

The method of claim 3, further comprising (d) cooling the uniform melt blend to a temperature below its solidification temperature, thereby giving the polyethylene blend as a solid of constant composition of (A) and (B) throughout.

### Claim 5 (depends on 1)

A polyolefin composition comprising the polyethylene blend of claim 1 and at least one additive (constituent) (C) to (M): (C) a lubricant; (D) a polymer processing aid; (E) an antioxidant; (F) a metal deactivator; (G) an ultraviolet light-promoted degradation inhibitor (“UV stabilizer”); (H) a slip agent; (I) a hindered amine stabilizer; (J) an antiblock agent; (K) a colorant; (L) an antifog agent; and (M) an antistatic agent; with the proviso that the total amount of the at least one additive is from >0 to 5 wt % of the polyolefin composition and the polyethylene blend is from <100 to 80 wt % of the polyolefin composition.

### Claim 6 (depends on 5)

A method of making the polyolefin composition of claim 5, the method comprising contacting the polyethylene blend with the at least one additive (C) to (M) to give the polyolefin composition.

### Claim 7 (depends on 1)

A manufactured article comprising a shaped form of the polyethylene blend of claim 1.

### Claim 8 (depends on 1)

A polyethylene film of the polyethylene blend of claim 1, wherein when the film has a thickness of 0.0127 millimeter the film has the puncture resistance, measured according to ASTM D5748-95(2012), of at least 24.8 J/cm3.

### Claim 9 (depends on 1)

A method of making a polyethylene film, the method comprising restricting in one dimension a melt of the polyethylene blend of claim 1, thereby giving the polyethylene film, wherein when the film has a thickness of 0.0127 millimeter the film has the puncture resistance, measured according to ASTM D5748-95(2012), of at least 24.8 J/cm3.