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Polyolefin foam material and its application

A technology of polyethylene and polyethylene vinyl acetate, applied in the field of polymer foam material composition and its products, can solve the problems of poor mechanical properties tear strength and tensile strength, difficult cross-linking and the like

Active Publication Date: 2012-08-08
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] EMA foams may have poor mechanical properties such as tear strength and tensile strength and may be difficult to crosslink

Method used

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  • Polyolefin foam material and its application
  • Polyolefin foam material and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0042] testing method

[0043] Crosslinking properties were measured on an MDR-2000 Rheometer (A-Technology Co., Ohio) in accordance with ASTM-2084 under the same conditions as foaming. The maximum torque is recorded in Table 1.

[0044] Foam resilience is determined according to ASTM D 3574. The hardness of the foam material was carried out according to ASTM D2240 on a C type (spring type) hardness tester manufactured by ASKER, Japan. Compression set was measured according to ASTM D 3754, condition 50°C / 6 hours. Tear strength is determined according to ASTM D 3574. Compressive strength testing was performed on an InstronUniversal testing machine with a compression box to deform foam samples at a uniform rate of 0.05 inches / minute. The stress required to achieve 50% compressive strain was determined. Compressive stress is determined as the force per unit area of ​​the initial foam cross-section.

[0045] Sample Preparation

[0046] Polymers and chemicals were weighe...

Embodiment 1

[0059] Example 1 : E / MA, 550 g; MPE (density = 0.87 g / cc, melt index = 1.0 from DuPont Dow Elastomers), 276 g; DCP, 6.7 g; Blowing agent, 30 g; Zinc stearate, 8.0 g; ZnO, 8.0 g; Stearic acid, 4.0 g; CaCO 3 , 25 grams.

Embodiment 2

[0060] Example 2 : E / MA, 450 g; MPE, 382 g; DCP, 6.7 g; Blowing agent, 30 g; Zinc stearate, 8.0 g; ZnO, 8.0 g; Stearic acid, 4.0 g; CaCO 3 , 25 grams.

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PUM

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Abstract

A composition that can be used as foam composition is disclosed, which comprises or is produced from (1) an ethylene acrylate copolymer and a soft ethylene polymer; or (2) an ethylene acrylate copolymer, an acid copolymer, an ionomer of the acid copolymer, or combinations thereof, and optionally a soft ethylene polymer. The ethylene acrylate copolymer comprises repeat units derived from ethylene and alkyl acrylate. The acid copolymer comprises repeat units derived from ethylene and at least an unsaturated carboxylic acid, acid anhydride, or monoester of the acid, or combinations of two or more thereof. The soft ethylene polymer comprises copolymer of ethylene and a-olefin, copolymer of ethylene and vinyl acetate, or combinations thereof.

Description

[0001] The present invention relates to polymeric foam compositions (eg, cross-linked polymeric foam compositions) and articles thereof. Background of the Invention [0002] Polyolefin materials include polymers ranging from semi-rigid polypropylene (PP) to flexible ethylene polymers. They can be used to prepare a variety of foam products. Most polyolefin foams are closed cell foams that are buoyant, resilient, tough, flexible and resistant to chemicals and friction. As a result, polyolefin foams can be used in packaging, construction, thermal insulation, sports, leisure and footwear applications. [0003] Ethylene and vinyl acetate (EVA) copolymers have been widely used as base resin polymers in foam applications for many years. Cross-linked EVA foam (expanded with a chemical blowing agent) provides an attractive balance of resilience, durability, and other physical properties desirable for footwear applications. These properties are combined with the advantages of low den...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/00C08L23/08C08F255/00C08F255/02C08F265/04C08L51/00C08L51/06
CPCC08L23/0815C08F255/00C08F265/04C08L51/06C08L2203/14C08L23/0869C08F255/02C08L51/003C08L2205/02C08L2666/06C08L2666/02
Inventor 周天华金桂铉W·C·惠尔彻尔
Owner DOW GLOBAL TECH LLC