Styrenic resin having improved extensional viscosity

Active Publication Date: 2014-02-13
AMERICAS STIRENICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]In another aspect, the present disclosure provides compositions incorporating the enhanced EV styrenic resin. The composition may include the enhanced EV styrenic resin having an Mz+1 molecular weight with a minimum value of approximately 745,000 and an extensional viscosity having a minimum value of 360,000 Pascal-seconds (Pa-sec). Additionally, the composition may incorporate various other resin materials, including but not limited to post-consumer recycle (PCR) polystyrenes, rubber-modified or high impact polystyrene (HIPS) resins, polyolefins, and the like. Other materials that may be incorporated into these compositions include colorants, antioxidants, mold release agents, anti-blocking agents, plasticizers, or any combination thereof.
[0010]In a further aspect, the present disclosure provides embodiments of styrenic resins produced by generating virgin styrenic resin having improved EV in the presence of PCR polystyrenes. For example, a styrenic resin may include between approximately 50 weight percent and 90 weight percent virgin styrenic resin, the virgin styrenic resin having an Mz+1 of at least approximately 745,000. The styrenic resin may also include between approximately 10 and 25 weight percent or approximately 25 and 50 weight percent PCR polystyrene. In such embodiments, when the styrenic resin includes between approximately 10 and 25 weight percent PCR polystyrene, the styrenic resin has an extensional viscosity of at least approximately 293,000 Pascal-seconds (Pa-sec), and when the styrenic resin comprises between approximately 25 and 50 weight percent PCR polystyrene, the extensional viscosity is at least approximately 245,000 Pa-sec.

Problems solved by technology

The additional shear and heat history placed on the styrenic resin as a result of this reprocessing causes a certain degree of chain scission of the styrenic polymer chains.
This lower molecular weight results in a variety of undesirable characteristics in the final part such as poor sidewall distribution in a thermoformed part; low sheet orientation and poor toughness in oriented film and sheet applications; and high open cell content, low orientation, and poor toughness in foam sheet structures and thermoformed articles.

Method used

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  • Styrenic resin having improved extensional viscosity
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Example

[0013]One or more specific embodiments will be described below. In an effort to provide a concise description of these embodiments, not all features of an actual implementation are described in the specification. It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another. Moreover, it should be appreciated that such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure.

[0014]When introducing elements of various embodiments of the present disclosure, the articles “a,”“an,”“the,” and “said” are intended to mean that there are one or more of the eleme

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Abstract

The extensional viscosity of a styrenic resin is enhanced by increasing the Z+1 average molecular weight (Mz+1) of the resin. In one embodiment, an enhanced extensional viscosity resin is provided that has an Mz+1 molecular weight of at least approximately 745,000 and an extensional viscosity having a minimum value of approximately 360,000 Pascal-seconds (Pa-sec).

Description

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Claims

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Application Information

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Owner AMERICAS STIRENICS
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