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Molded polymeric article with low haze and high clarity

A technology for polymers and injection molding products, which is applied in the field of manufacturing molded products, and can solve problems such as turbidity, unclearness, and unsuitability for final applications with low haze and/or high clarity of blend compositions

Active Publication Date: 2014-11-19
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such blends also have disadvantages
Blending polymeric materials with different refractive indices, for example, resulting in cloudy and / or unclear final blend compositions
Such blends are not suitable for end applications requiring low haze and / or high clarity

Method used

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  • Molded polymeric article with low haze and high clarity
  • Molded polymeric article with low haze and high clarity
  • Molded polymeric article with low haze and high clarity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0134] A. Preparation of Molded Articles

[0135] The propylene-based polymer and elastomer were dry blended and injection molded into molded articles using an 85 ton Cincinnati Milacron Elektra injection molding machine under the conditions given in Table 1 below.

[0136] Table 1

[0137]

[0138] Comparative samples 4-8 and each example were injection molded into 0.5 mm test pieces to simulate injection molding into thin-walled containers. The examples are surprisingly clarifying. The propylene based polymers (matrix) were Dow 6D83K, Dow 751-12, and Dow 7021-50RNA. All three propylene-based polymers are random propylene copolymers (RCP) with 3% (wt.) ethylene comonomer.

[0139] comparison sample

[0140] Compare samples 1 to 3. Comparative samples were fabricated by conventional extrusion methods using similar materials to those of Examples 2 and 3. These samples were very cloudy and not clear at all. This is because the particles scatter light due to a mismatch ...

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Abstract

The present disclosure provides a molded article composed of a polymeric composition and processes for producing the same. The polymeric composition includes from about 60 wt % to about 99 wt % of a matrix of a propylene-based polymer. The propylene-based polymer has a refractive index (n1). The polymeric composition also includes from about 40 wt % to about 1 wt % of elongated elastomer particles dispersed in the propylene-based polymer. The elongated elastomer particles have a refractive index (n2). The propylene-based polymer and the elongated elastomer particles exhibit a refractive index mismatch whereby |n1-n2|>0.002. The molded article has a haze value less than about 20% and optionally a viscosity ratio (VR) greater than 0.28.

Description

Background technique [0001] Blending of incompatible polymeric materials is known. Polymer blends are used to achieve performance criteria not unique to the individual polymer components. However, such blending also has disadvantages. Blending polymeric materials with different refractive indices, for example, results in hazy and / or unclear final blend compositions. Such blends are not suitable for end applications requiring low haze and / or high clarity. [0002] Accordingly, there is a need for polymer blends having high clarity and / or low haze that do not require refractive index matching between the individual polymer components. Contents of the invention [0003] The present disclosure relates to polymer blends and molded articles having low haze and / or high clarity, and methods of making the same. Molded articles comprising the polymer blends of the present invention exhibit low haze, high clarity, and improved impact strength. [0004] The present disclosure provi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/10
CPCC08L23/10C08L23/0815C08L23/16C08K5/0083C08L2207/02C08L2666/06
Inventor P.S.迪亚斯D.R.威尔逊D.奥纳-德利奥曼利A.S.摩根T.W.格拉斯
Owner DOW GLOBAL TECH LLC