# US 10,308,740 B2 · Amorphous propylene-ethylene copolymers

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- Number: US 10,308,740 B2
- Document ID: US10308740B2
- Status: Granted
- Kind: B2
- Application number: 15/683,964
- Filed: 2017-08-23
- Published: 2018-03-01
- Granted: 2019-06-04
- Earliest claimed: 2014-02-07
- Assignees: Eastman Chemical Company
- Applicants: Eastman Chemical Company
- Inventors: Mutombo Joseph Muvundamina; Gary Robert Robe; Timothy Williams; Andrea Gail Hagood; Dhiraj Sudesh Sood; Marc Stacey Somers; Bennett H. Novak; Puthenkovilakom Rajesh Raja; Raymond Prescott Cottle
- Web page: https://patentgrep.com/patent/US10308740B2

## CPC

- C08F 210/06: Propene
- C08K 5/01: Hydrocarbons {(C08K5/0091 takes precedence)}
- C08K 5/134: Phenols containing ester groups
- C08L 23/10: Homopolymers or copolymers of propene
- C09J 11/06: organic
- C09J 123/10: Homopolymers or copolymers of propene
- C09J 123/14: Copolymers of propene (C09J123/16 takes precedence)
- C08F 2500/02: Low molecular weight, e.g. <100,000 Da.
- C08F 2500/17: Viscosity
- C08L 53/02: of vinyl-aromatic monomers and conjugated dienes
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)

## Abstract

A low molecular weight copolymer is provided comprising propylene and ethylene, wherein the low molecular weight copolymer has a softening point in the range of 90 to 140° C., wherein the low molecular weight copolymer has a needle penetration that is equal to y, wherein y is defined by the following formula: y≤−0.000000262249x6+0.000172031278x5−0.046669720165x4+6.701746779438x3−537.286013331959x2+22,802.983472587x−400,204.018086126 wherein x in the above formula is the softening point of the low molecular weight copolymer, and wherein the low molecular weight copolymer has a molecular weight polydispersity index of about 3 to about 25, a crystallinity of about 18% to about 30% measured by X-Ray diffraction, and a Brookfield viscosity in the range of about 1000 to about 4000 cp at 190° C. measured by ASTM D 3236. Adhesive compositions comprising the low molecular weight copolymer are also provided.

## Claims

### Claim 1

A low molecular weight copolymer comprising propylene and ethylene,
wherein said low molecular weight copolymer has a softening point in the range of 90 to 140° C.,
wherein said low molecular weight copolymer has a needle penetration that is equal to y,
wherein y is defined by the following formula:
y≤−0.000000262249x6+0.000172031278x5−0.046669720165x4+6.701746779438x3−537.286013331959x2+22,802.983472587x−400,204.018086126
wherein x in the above formula is the softening point of said low molecular weight copolymer,
wherein said low molecular weight copolymer has a molecular weight polydispersity index of about 3 to about 25, a crystallinity of about 18% to about 30% measured by X-Ray diffraction, and a Brookfield viscosity in the range of about 1000 to about 4000 cp at 190° C. measured by ASTM D 3236.

### Claim 2 (depends on 1)

The low molecular weight copolymer of claim 1 wherein said copolymer has a crystallinity content of about 20% to about 30%.

### Claim 3 (depends on 1)

The low molecular weight copolymer of claim 1 wherein said copolymer has a weight average molecular weight of 25,000 to 50,000.

### Claim 4 (depends on 3)

The low molecular weight copolymer of claim 3 wherein said copolymer has a weight average molecular weight of 30,000 to 45,000.

### Claim 5 (depends on 1)

The low molecular weight copolymer of claim 1 wherein said copolymer has a molecular weight polydispersity index of about 8 to about 23.

### Claim 6 (depends on 5)

The low molecular weight copolymer of claim 5 wherein said copolymer has a molecular weight polydispersity index of about 6 to about 15.

### Claim 7 (depends on 1)

The low molecular weight copolymer of claim 1 wherein said number average molecular weight ranges from about 1,000 to about 20,000.

### Claim 8 (depends on 1)

The low molecular weight copolymer of claim 1 wherein said Brookfield viscosity ranges from about 1,500 to about 3,000.

### Claim 9 (depends on 1)

The low molecular weight copolymer of claim 1 wherein the storage modulus (G′) at 25° C. of said low molecular weight copolymer ranges from about 1 MPa and 10 MPa.

### Claim 10 (depends on 1)

The low molecular weight of claim 1 wherein the tensile strength of said low molecular weight copolymer ranges from about 2.5 MPa to about 4.5 MPa.

### Claim 11

A low molecular weight copolymer comprising propylene and ethylene wherein said low molecular weight copolymer has a weight average molecular weight of about 25,000 to about 45,000, a number average molecular weight of about 1,000 to about 12,000, a z-average molecular weight of about 90,000 to about 140,000, a polydispersibility (Mw/Mn ratio) of about 3 to about 25, a crystallinity of about 20% to about 30%, and a Brookfield viscosity of 1,000 to 4,000 cp at 190° C.

### Claim 12 (depends on 11)

A low molecular weight copolymer according to claim 11 wherein said low molecular weight copolymer has a storage modulus (G′) at 25° C. of 1 to 10 MPa; a crossover temperature (for G′ and G″) of 110 to 120° C. with an associated tan δ of 0.35 to 0.50; and a glass transition of −40 to −25° C.

### Claim 13 (depends on 1)

An article comprising said low molecular weight copolymer of claim 1.

### Claim 14 (depends on 1)

An adhesive composition comprising said low molecular weight copolymer of claim 1.

### Claim 15 (depends on 14)

The adhesive composition of claim 14, wherein said adhesive composition comprises in the range of 5 to 95 weight percent of said low molecular weight copolymer.

### Claim 16 (depends on 14)

The adhesive composition of claim 14, wherein said adhesive composition comprises in the range of 5 to 95 weight percent of at least one polymer.

### Claim 17 (depends on 14)

The adhesive composition of claim 14, wherein said adhesive composition comprises in the range of 0 to 70 weight percent of at least one tackifier.

### Claim 18 (depends on 14)

The adhesive composition of claim 14, wherein said needle penetration is in the range of 0.5 to 70 dmm.

### Claim 19 (depends on 14)

The adhesive composition of claim 14, wherein said adhesive composition applied at 100-145° C. has a peel strength in the range of 1 to 200 g/mm, and wherein said adhesive composition applied at 145-180° C. has a peel strength in the range of 1 to 250 g/mm.

### Claim 20 (depends on 14)

The adhesive composition of claim 14, wherein said adhesive composition has a loop tack in the range of 0.1 to 50 lbf.