US 4,882,393 AGrant

Ionomer-Modified Polyethylene as Film Material

Issue Date:1989-11-21

•3 Claims

•1 Drawing Sheets

Abstract

An ionomer-modified polyethylene, that is, an ethylene/carboxylic acid copolymer in which at least some of the acidic groups are neutralized, is preparable by a one-stage procedure by reacting ethylene with unsaturated carboxylic acids and salts of such unsaturated carboxylic acids in the presence of a free radical polymerization initiator, under the conditions employed in the production of high pressure polyethylene (LDPE). The concentration of salt which is incorporated in the polymer is kept at no more than 1 mol %, relative to converted ethylene and other comonomers respectively. Advantageously, the unsaturated carboxylic acids and their salts are added to the copolymerization reaction as a homogeneous solution in a suitable solvent. The ionomer-modified polyethylenes based on low density polyethylene (LDPE), in which 30-95% of the carboxyl groups are neutralized and the neutralized carboxyl groups represent 0.1-0.8 mol % of the total number of moles of all monomers are suitable as a film material having high strength, good drawability and high tear propagation resistance.

Metadata

Assignee

EC Erdoelchemie GmbH

Inventors

Jens Herwig
Alois Kolwert
Hubert Sutter
Dieter Woltjes

Application Information

Application Number:US 2305593

Filing Date:1988-08-10

Priority Date:1985-11-21

Art Unit:155

Classifications

IPC:

C08F 842

Field of Search:

525330.2;330.6;366;370

Patent Drawings (1 sheets)

Description

Brief Description of Fig. 1

FIG. 1 illustrates the film properties (examples 6-13).

Detailed Description of Fig. 1

FIG. 1 illustrates the film properties (Examples 6-13)

tear propagation resistance TP (g)

relative extrudability .DELTA.1 (m) and

dart drop strength DD (g)

as a function of the zinc ion concentration Zn.sup.2+ (mol %), relative to the total number of moles of ethylene and methacrylic acid. To ensure comparability, products having the same final melt index were aimed at.

The relevant range is shaded with single lines, and the preferred range is cross-hatched.

Claims

What is claimed is:

1. A film material prepared from a low density polyethylene (LDPE) which is an ionomer-modified copolymer wherein 30-95% of the carboxyl groups present in the copolymer are neutralized, and the neutralized carboxyl groups represent 0.1-0.6 mol %, of the total number of moles of all monomers in the copolymer said copolymer being an ethylene/carboxylic acid copolymer and wherein the copolymer contains acrylic acid or methacrylic acid as comonomers and wherein the cations of the metals sodium, zinc or magnesium are present in the copolymer.

2. A film material according to claim 1, wherein the copolymer possesses a melt index in the range of 0.1-20 g/10 min (190.degree. C.; 2.16 kp).

3. A film material according to claim 1, wherein the copolymer is obtained by partial neutralization of an ethylene carboxylic acid copolymer with metal cations in the discharge extruder of the high pressure polyethylene production plant.

Patent Citations (1)

Patent	Date	Inventor	Cited By
US3264272	1966-08-01	Rees

Abstract

Description

Brief Description of Fig. 1

FIG. 1 illustrates the film properties (examples 6-13).

Detailed Description of Fig. 1

FIG. 1 illustrates the film properties (Examples 6-13)

tear propagation resistance TP (g)

relative extrudability .DELTA.1 (m) and

dart drop strength DD (g)

The relevant range is shaded with single lines, and the preferred range is cross-hatched.

Claims

What is claimed is:

2. A film material according to claim 1, wherein the copolymer possesses a melt index in the range of 0.1-20 g/10 min (190.degree. C.; 2.16 kp).

Patent

Date

Inventor

Cited By

US3264272

1966-08-01

Rees