# US 8,772,411 B2 · Preparation of polyolefin-based adhesives

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- Number: US 8,772,411 B2
- Document ID: US8772411B2
- Status: Granted
- Kind: B2
- Application number: 12/454,780
- Filed: 2009-05-22
- Published: 2010-11-25
- Granted: 2014-07-08
- Earliest claimed: 2009-05-22
- Assignees: Equistar Chemicals, LP
- Applicants: Chun D. Lee; Charles S. Holland; Maged G. Botros
- Inventors: Chun D. Lee; Charles S. Holland; Maged G. Botros
- Web page: https://patentgrep.com/patent/US8772411B2

## CPC

- C08F 255/02: on to polymers of olefins having two or three carbon atoms
- B32B 1/08: Tubular products
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 15/06: of {natural rubber or synthetic} rubber
- B32B 15/08: of synthetic resin
- B32B 15/20: comprising aluminium or copper {(B32B15/016 and B32B15/017 take precedence)}
- B32B 25/08: of synthetic resin
- B32B 25/14: comprising {synthetic rubber copolymers (B32B25/18 and B32B25/20 take precedence)}
- B32B 27/08: of synthetic resin
- B32B 27/18: characterised by the use of special additives
- B32B 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- C09J 123/0815: {Copolymers of ethene with aliphatic 1-olefins}
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2307/50: having particular mechanical properties
- B32B 2307/554: Wear resistance
- B32B 2307/72: Density
- B32B 2307/7244: Oxygen barrier
- B32B 2405/00: Adhesive articles, e.g. adhesive tapes
- B32B 2553/00: Packaging equipment or accessories not otherwise provided for
- B32B 2597/00: Tubular articles, e.g. hoses, pipes
- C08L 51/06: grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
- C08L 2666/24: Graft or block copolymers according to groups C08L51/00, C08L53/00 or C08L55/02; Derivatives thereof
- Y10T 428/31938: Polymer of monoethylenically unsaturated hydrocarbon
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- 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)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Disclosed is a polyolefin-based adhesive. The adhesive comprises a maleated polyolefin. The maleated polyolefin is let-down in a linear low density polyethylene (LLDPE). The let-down LLDPE is selected from those which have a melt index MI2 within the range of 0.1 dg/min to 5 dg/min, preferably from 1 dg/min to 3 dg/min, and comprises a TREF soluble fraction having an intrinsic viscosity less than 0.9 dl/g. The adhesive composition can be used in multilayer polyolefin films and multilayer pipes.

## Claims

### Claim 1

An adhesive composition comprising:
(i) 2 to 30 wt. %, based upon the total weight of the adhesive composition, of a maleated polyolefin; and
(ii) a linear low density polyethylene (LLDPE), wherein the LLDPE comprises;
greater than 15 to less than 20 wt. %, based upon the total weight of the LLDPE, of a TREF soluble fraction in ortho-dichlorobenzene, wherein the TREF soluble fraction has an intrinsic viscosity of greater than 0.3 to less than 0.7 dl/g as measured in ortho-dichlorobenzene at 150° C., and wherein the LLDPE has a melt index MI2 from 0.1 dg/in to 3 dg/min
wherein the TREF soluble fraction is measured from the peak area of the TREF curve below 45° C.

### Claim 2 (depends on 1)

The composition of claim 1, wherein the maleated polyolefin is a maleated high density polyethylene (HDPE).

### Claim 3 (depends on 2)

The composition of claim 2, the maleated HDPE has a grafted maleic anhydride content within the range of 0.5 wt % to 3.5 wt %.

### Claim 4 (depends on 1)

The composition of claim 1, which further comprises a polyolefin elastomer.

### Claim 5 (depends on 4)

The composition of claim 4, wherein the polyolefin elastomer is an ethylene-propylene rubber.

### Claim 6 (depends on 1)

A multilayer film comprising a layer of the adhesive of claim 1.

### Claim 7 (depends on 1)

A multilayer pipe comprising a layer of the adhesive of claim 1.

### Claim 8 (depends on 1)

The composition of claim 1, wherein the TREF soluble fraction has an intrinsic viscosity of about 0.6 dl/g.

### Claim 9

A process for producing a polyolefin-based adhesive, comprising:
(i) blending 2 to 30 wt. %, based upon the total weight of the adhesive composition, of a maleated polyolefin; and
(ii) a linear low density polyethylene (LLDPE), wherein the LLDPE comprises:
greater than 15 to less than 20 wt.%, based upon the total weight of the LLDPE, of a TREF soluble fraction in ortho-dichlorobenzene, wherein the TREF soluble fraction has an intrinsic viscosity greater than 0.3 to less than 0.7 dl/g as measured in ortho-dichlorobenzene at 150° C., and wherein the LLDPE has a melt index MI2 from 0.1 dg/min to 3 dg/min
wherein the TREF soluble fraction is measured from the peak area of the TREF curve below 45° C.

### Claim 10 (depends on 9)

The process of claim 9, wherein the LLDPE is a reactor powder.

### Claim 11 (depends on 9)

The process of claim 9, the maleated polyolefin has a maleic anhydride content within the range of 0.5 wt % to 3.5 wt %.

### Claim 12 (depends on 9)

The process of claim 9, wherein the TREF soluble fraction has an intrinsic viscosity of about 0.6 dl/g.

### Claim 13 (depends on 9)

The process of claim 9, wherein the maleated polyethylene is an maleated high density polyethylene (HDPE).