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Methods to control swell index in high impact polystyrene

A polystyrene, high impact technology, applied in the HIPS system, the swelling index system field, can solve problems such as changing the elasticity of the elastomer phase, which is not conducive to the final characteristics of HIPS

Active Publication Date: 2019-07-26
FINA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, excessive crosslinking can alter the elasticity of the elastomeric phase and is detrimental to the final properties of HIPS, such as impact strength and environmental stress cracking resistance

Method used

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  • Methods to control swell index in high impact polystyrene
  • Methods to control swell index in high impact polystyrene
  • Methods to control swell index in high impact polystyrene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1: Antioxidant added just before devolatilization (20 minutes before target conversion)

[0051] A HIPS batch polymerization was run to test the effectiveness of antioxidants according to the present disclosure to control crosslinking and maintain the elastic properties of the rubber phase. The HIPS batch polymerization was run according to the recipe and conditions listed in Table 1. To better simulate the plant production process, recycle (70% ethylbenzene and 30% styrene monomer) was collected and used in each reaction. Pre-dissolve potential cross-linking retardants / antioxidants in approximately 2 mL of ethylbenzene and add either to the feed prior to the reaction or 20 min prior to the target conversion (70% target conversion) . After the batch reaction was complete, the polymer was devolatilized (to remove residual monomer and other volatile components) in a vacuum oven at 225°C and a pressure of less than 10 Torr for 60 minutes. Swell index measurement...

Embodiment 2

[0059] Example 2: Addition of Antioxidant to Polymerization Feed

[0060] Experiments have shown that AO1 is effective when added at a later stage of polymerization. However, as mentioned above, it would be advantageous and more cost effective if a scorch retarder could be added to the polymerization feed. A HIPS batch reaction / experiment similar to Example 1 was run (using the Table 1 recipe) to test the effectiveness of adding antioxidants to the polymerization feed. The swell index was again determined and used as an indirect measure of the crosslink density of the rubber. Table 3 presents the analytical results for the reaction where AO1 was added to the polymerization feed.

[0061]

[0062] From the results in Table 3, it can be concluded that the efficiency of the additive remains the same regardless of whether the additive is added at the end of the polymerization or at the beginning of the polymerization. Again, polydispersity and molecular weight do not appear ...

Embodiment 3

[0063] Example 3: Color and Recycled Material Contamination Results of HIPS Samples Prepared Using AO1 and Zinc Stearate

[0064] As noted above, the addition of zinc stearate as a mold release additive is known in the art to alter the color of the resulting HIPS, which may be undesirable for certain end applications. Also as noted above, certain reagents, such as polyisobutylene (PIB), added in undesired amounts (eg, 10 to 15%) to improve ESCR can be undesirably lost in the devolatilization section. Experiments were conducted to investigate the effect, if any, of the addition of the antioxidant antiscorch additives disclosed herein on the color, and to determine the amount, if any, of recycled material contamination during the polymerization of HIPS. As indicated below, experiments were performed with the antioxidant added 20 minutes before the target conversion was reached (70% target conversion) or with the antioxidant added in the feed. Table 4 summarizes some of the resu...

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Abstract

A method includes operating a high impact polystyrene (HIPS) reaction system having a devolatilizer downstream of a polymerization reactor, and from which a HIPS product is obtained, and injecting anantioxidant into the HIPS reaction system prior to the devolatilizer, with the antioxidant being one or more aromatic antioxidants. A HIPS product produced by operating a HIPS reaction system to produce a HIPS product, with the HIPS reaction system including a devolatilizer downstream of a polymerization reactor, and including injecting an antioxidant into the HIPS reaction system prior to the devolatilizer, with the antioxidant being comprising one or more aromatic antioxidants. The antioxidant may comprise at least one thiol group, at least one cresol group, or both. A system for producing the HIPS product is also provided.

Description

[0001] Cross References to Related Applications [0002] This application claims under 35 U.S.C. § 119(e) a document entitled "Method of Controlling Swell Index of High Impact Polystyrene," filed December 8, 2016, by Fina Technology, Inc. Priority to US Provisional Patent Application No. 62 / 431,706, the disclosure of which is incorporated herein by reference in its entirety. [0003] Statement Regarding Federal Funding for Research and Development [0004] Not applicable. [0005] Reference to Microfiche Addendum [0006] Not applicable. technical field [0007] The present disclosure relates to the production of high impact polystyrene and other elastomer reinforced polymers of vinyl aromatics (collectively referred to herein as 'HIPS'). More specifically, the present disclosure provides systems and methods for controlling the swell index of HIPS. Still more specifically, the present disclosure provides systems and methods for producing HIPS with a desired degree of cros...

Claims

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Application Information

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IPC IPC(8): C08F2/38C08F2/40C08F6/00C08F279/02C08K5/13C08K5/375
CPCC08F6/001C08F279/02C08K5/375C08K5/13C08L51/04C08F2/40C08F212/08C08F2/01C08K5/005C08F2/38C08K5/372C08J3/24
Inventor C·德安达G·特里米诺B·斯泰尔斯
Owner FINA TECH
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