Ionomers of ethylene acid copolymers with enhanced creep resistance

A technology of ethylene acid copolymer and ionomer, applied in the field of ionomer resin, can solve problems such as restricted use

Pending Publication Date: 2021-03-02
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although ionomers can be used in many applications, ionomers have a limited service temperature, which limits the use of ionomers in applications requiring creep resistance at temperatures above 60 °C

Method used

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  • Ionomers of ethylene acid copolymers with enhanced creep resistance
  • Ionomers of ethylene acid copolymers with enhanced creep resistance

Examples

Experimental program
Comparison scheme
Effect test

example

[0056] test program

[0057] Melt index (MI) was measured using ASTM D-1238 using a 2160 gram weight.

[0058] Melting points (Tm) were measured using Differential Scanning Calorimetry (DSC). Differential scanning calorimetry was measured on a TA Instruments Q1000DSC equipped with an RCS cooling accessory and an autosampler. The melting point (Tm) of the samples was measured according to ASTM D3418.

[0059] The composition of the ionomer was determined using a Perkin Elmer Fourier transform infrared spectrometer (FTIR). Compression molded films with a thickness of 5 mils were used for FTIR analysis.

[0060] The following examples are provided to illustrate various embodiments, but are not intended to limit the scope of the claims. All parts and percentages are by weight unless otherwise indicated. Approximate properties, characteristics, parameters, etc. regarding various working examples, comparative examples, and materials used in the working and comparative examples ...

example 1-

[0061] Example 1 - Creep Resistance of Ethylene Acid Copolymers

[0062] Creep resistance changes with time, temperature and load weight (stress). A simple test was used to differentiate the creep resistance of ionomers with and without dicarboxylic acid comonomer MAME when neutralized with various metal cations with or without MAME. Creep tests were performed by measuring the dimensional change (perpendicular) of film samples attached to an empty load in a cross-flow air furnace with racks to hold the sample holder. Creep testing was performed on 10 mil thick, 1 inch wide, 3 inch long strips of compression formed film cut from the compression formed film. The film was hung under an empty load of 100 grams, and the oven was initially set at 100°C. The deformation of the film samples was measured after 30 minutes in the oven. The furnace temperature was then raised to 120°C for testing.

[0063] The results summarized in Table 1 include data from Inventive Examples 1.1 to 1...

example 2

[0068] Example 2 - Creep Resistance of Ionomer Blends

[0069] As summarized in Table 2, the results are blends of various ionomer samples of E / MAA / MAME terpolymer and E / MAA copolymer. The blends were prepared in a 26mm twin extruder with mixing screws using a melt temperature between 220°C and 250°C. Creep temperature is defined as the deformation of the film to 25% strain under a load of 110 grams.

[0070] Examples 2.1. to 2.6 include polymeric resin blends of ethylene acid copolymer A, ethylene acid copolymer B, and ethylene acid copolymer C.

[0071] Ethylene acid copolymer A ("Polymer A") is a Mg ionomer of ethylene acid copolymer comprising the polymerization reaction product of ethylene and 15% by weight methacrylic acid, wherein 50 mole percent of the nominal total acid units are replaced by Mg Cation neutralization. The melt index (MI) of the ionomer was 0.8 g / 10 minutes as measured according to ASTM D1238 at 190°C, 2.16 kg.

[0072] Ethylene acid copolymer B ("P...

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Abstract

According to one embodiment, an ionomer includes a neutralized blend of an ethylene acid copolymer. The ethylene acid copolymer comprises the polymerized reaction product of ethylene; from 2 to 20 wt.% of monocarboxylic acid monomer based on the total wt.% of the monomers present in the ethylene acid copolymer; from 2 to 15 wt.% of unsaturated dicarboxylic acid monomer based on the total wt.% of the monomers present in the ethylene acid copolymer. In the ionomer 10 to 60% of total acid units of the ethylene acid copolymer are neutralized by a magnesium cation.

Description

[0001] Cross application of related applications [0002] This application claims priority to US Application Serial No. 62 / 712,596, filed July 31, 2018, the entire disclosure of which is incorporated herein by reference. technical field [0003] Embodiments of the present disclosure relate generally to ionomer resins, and in particular to ionomers comprising the polymerization reaction product of ethylene, monocarboxylic acid monomers, unsaturated dicarboxylic acid monomers, alkyl acrylates Monomers and combinations thereof, said ionomers being at least partially neutralized with magnesium cations. Background technique [0004] Ionomers are commonly used materials in a variety of applications because they have higher tensile strength, greater clarity, better abrasion resistance, and higher stiffness than their precursor acid copolymers. For example, ionomers of ethylene acid copolymers have found use in many applications such as food packaging, foam parts, injection molded...

Claims

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Application Information

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IPC IPC(8): C08L23/08
CPCC08L23/0876C08F210/02C08K3/08C08L23/08
InventorR·T·H·周
OwnerDOW GLOBAL TECH LLC