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Foams made from interpolymers of ethylene/alpha-olefins

An olefin copolymer and olefin copolymerization technology, applied in the field of foam prepared by ethylene/α-olefin copolymer, can solve the problems of impact foam rupture, tearing and shrinkage properties

Active Publication Date: 2012-01-04
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as previously mentioned, high cure levels (i.e., high crosslink density) can negatively impact the burst tear and shrinkage properties of the foam

Method used

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  • Foams made from interpolymers of ethylene/alpha-olefins
  • Foams made from interpolymers of ethylene/alpha-olefins
  • Foams made from interpolymers of ethylene/alpha-olefins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0289] Examples 1-4, Comparative Examples A-C

[0290] Typical high throughput parallel polymerization conditions

[0291] Polymerization was performed using a high throughput parallel polymerization reactor (PPR) available from Symyx technologies, Inc. and operated substantially in accordance with U.S. Patent Nos. 6,248,540, 6,030,917, 6,362,309, 6,306,658, and 6,316,663. Ethylene copolymerization was carried out at 130°C at 200 psi (1.4 MPa) with ethylene on demand and using 1.2 equivalents of Cocatalyst 1 (based on total catalyst used) (1.1 equivalents when MMAO was present). A series of polymerization reactions were carried out in a parallel pressure reactor (PPR) containing 48 individual reactor units in 6x8 arrays fitted with pre-weighed glass tubes. The operating volume within each reactor unit was 6000 μL. Each unit controls temperature and pressure, and provides stirring through individual stirring paddles. Monomer gas and quenching gas are directly sent into the...

Embodiment 1

[0299] The DSC curve for the polymer of Example 1 showed a melting point (Tm) of 115.7°C with a heat of fusion of 158.1 J / g. The corresponding CRYSTAF curve shows the highest peak at 34.5°C with a peak area of ​​52.9%. The difference between DSC Tm and Tcrystaf was 81.2°C.

Embodiment 2

[0300] The DSC curve for the polymer of Example 2 showed a peak with a melting point (Tm) of 109.7°C with a heat of fusion of 214.0 J / g. The corresponding CRYSTAF curve shows the highest peak at 46.2°C with a peak area of ​​57.0%. The difference between DSC Tm and Tcrystaf was 63.5°C.

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Abstract

The invention provides a foamable composition and foam containing at least one ethylene / alpha-olefin copolymer. The foam has a density of more than 150 to 500 kg / m<3>. The foamable composition further contains a foaming agent and a crosslinking agent. The ethylene / alpha-olefin copolymer is a multi-block copolymer containing at least one soft block and at least one hard block. The invention further provides a method for manufacturing the foamable composition and the foam, furthermore describes a foamed product made from the foam.

Description

technical field [0001] The present invention relates to foams comprising at least one ethylene / alpha-olefin interpolymer, methods of making the same, and methods of use in various applications, particularly shoe applications. Background technique [0002] Vulcanized rubbers (e.g., vulcanized styrene-butadiene rubber (SBR), butadiene rubber (BR), and natural rubber (NR)) are popular shoe sole materials because they possess desirable properties (e.g., abrasion resistance, Good balance of tensile strength, tear strength, and flexibility). However, vulcanizates can be difficult to handle and lose desirable properties when foamed. [0003] Ethylene vinyl acetate copolymer (EVA), polyolefin (PO), and blends thereof are used in the manufacture of foam products for shoe applications such as insoles, midsoles, outsoles, soles, and sole inserts. pieces. Formulating these foams generally requires trade-offs among desired properties, for example, resistance to compression set, resili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/00C08L23/00C08F2/38C08F295/00C08F297/08C08F4/659C08F4/6592C08F10/00C08F110/02C08F210/16
CPCC08F297/08C08F297/083C08F295/00C08F10/00C08F297/086C08F4/659C08L23/10C08L23/0815C08F4/65908C08F2410/01C08F110/02C08F210/16C08F4/65912C08F10/14C08L53/00C08L53/005C08F297/00C08L23/0853C08L2203/14C08L2312/00C08F4/65904C08L2666/02C08L2666/06C08L2666/04C08F2500/09C08F2500/03C08F2500/12C08F2500/20C08F210/08C08F210/14C08F2500/11C08F2500/21C08L2666/24C08F2500/17C08J9/228
Inventor M·A·普瑞多R·D·考克尔J·H·J·M·戴门Y·W·张
Owner DOW GLOBAL TECH LLC