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Ethylene acid copolymers, their ionomers, and their use in packaging films and injection molded articles

a technology of ethylene acid copolymer and ionomer, which is applied in the field of ethylene acid copolymer and ionome, and can solve problems such as optical properties being affected

Inactive Publication Date: 2015-12-31
PERFORMANCE MATERIALS NA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes an ethylene acid copolymer that has units of ethylene and two types of unsaturated carboxylic acid. These carboxylic acids are either copolymerized with the ethylene or they are added in a specific ratio to create a derivative of the ethylene acid copolymer. Optionally, some of the carboxylic acid groups can be neutralized to create carboxylate salts. The copolymer can be used to make packaging films, injection-molded articles such as containers, and other structures. The technical effect is that the copolymer provides improved properties such as high flexibility, high heat resistance, and good barrier properties.

Problems solved by technology

When ionomers are used in forming such injection molded containers, the optical properties may suffer due to the thickness of the wall.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

A. Materials

[0065]Acid copolymer resins and their ionomers were obtained from DuPont under the trademarks Nucrel®, Surlyn® or SentryGlas®. Alternatively, the polymers were synthesized by the methods described in U.S. Pat. No. 8,399,096. The first α,β-ethylenically unsaturated carboxylic acid was acrylic acid or methacrylic acid. As described above, a sufficiently high level and complementary amount of the derivative of the second α,β-ethylenically unsaturated carboxylic acid (here, i-butyl acrylate or n-butyl acrylate) was present in the reaction mixture. The compositions of the synthesized polymers, which are set forth in Table 1, were determined by nuclear magnetic resonance (NMR) spectroscopy, by titration, or by mass balance methods. The counterions of the ionomers were sodium cations.

B. Methods

[0066]The acid copolymers and ionomers were subjected to differential scanning calorimetry analysis in accordance with ASTM D3418 and as described in U.S. Pat. No. 8,399,096. The enthalpi...

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Abstract

Provided are novel ethylene acid copolymers, their ionomers and their use in various articles, including packaging films and injection molded articles. The ethylene acid copolymers comprise copolymerized units of ethylene, about 10 to about 30 wt % of copolymerized units of a first α,β-unsaturated carboxylic acid having 3 to 10 carbon atoms; and about 5 to about 15 wt % of copolymerized units of a derivative of a second α,β-unsaturated carboxylic acid having 3 to 10 carbon atoms. Preferred derivatives include esters, and in particular alkyl esters. These ethylene acid copolymers and ionomers have improved optical properties when compared to conventional ethylene acrylic or methacrylic acid copolymers and their ionomers.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS[0001]The present application claims priority under 35 U.S.C. §119 to U.S. Provisional Appln. No. 62 / 017,711, filed on Jun. 26, 2014, which is incorporated herein by reference in its entirety.FIELD OF THE INVENTION[0002]Provided are novel ethylene acid copolymers, ionomers of the ethylene acid copolymers, and the use of these copolymers and ionomers in various materials, including packaging films and injection molded articles. These copolymers and ionomers show improved optical properties when compared to conventional ethylene acrylic or methacrylic acid copolymers and their ionomers.BACKGROUND OF THE INVENTION[0003]Several patents, patent applications and publications are cited in this description in order to more fully describe the state of the art to which this invention pertains. The entire disclosure of each of these patents, patent applications and publications is incorporated by reference herein.[0004]Ionomers are copolymers produced by...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08F210/02A63B37/00C08J5/18
CPCA63B37/0003A63B37/0024C08J5/18C08J2323/08C08K5/053C08F2810/20C08F210/02A63B37/0039A63B37/0051C08K5/5435C08K5/544C08F220/06C08F220/10C08F2500/26C08F8/14C08L23/0876C08F2/44B29C49/00B65D65/02
Inventor MEERSCHEIDT, SHANNON D.PESEK, STEVEN C.SHAFFER, W ALEXANDERSMITH, CHARLES ANTHONY
Owner PERFORMANCE MATERIALS NA INC