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Production of polystyrene for foaming applications using a combination of peroxide initiators

A technology of initiator and styrene, which is applied in the field of improving the preparation of polystyrene and styrene copolymers, and can solve problems such as difficult optimization and few

Inactive Publication Date: 2007-04-18
FINA TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as mentioned, the method for preparing branched polystyrene is difficult to optimize, and there are not many known commercial grade non-linear polystyrene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-9

[0048] In this study, a formulation for the production of low melt flow crystalline polystyrene was prepared. Screening of monofunctional peroxycarbonate (TAEC) and tetrafunctional peroxycarbonate (JWEB 50) combined with commonly used initiators L531 and L533. The standard initiator composition used is 200 ppm L531 and 50 ppm L533. The tetrafunctional initiator JWEB 50 appears to increase the molecular weight as expected.

[0049] The purpose is to use the rate in increasing the production rate of low melt flow crystalline polystyrene. The different initiator combinations were compared, and the polymerization rate of L531 and L533 combinations currently used in the preparation of low melt flow crystalline polystyrene (PS) was studied. Laboratory conditions used when batch polymerization is used to prepare low-melt-flow materials. The temperature rise conditions used are 70 minutes at 100°C; 180 minutes at 110°C; 75 minutes at 120°C and 80 minutes at 130°C. These heating conditions...

Embodiment 10-13

[0059] The first addition amount of the test is 500 ppm. For this addition, remove the equivalent amount of active oxygen L531 from the formula. Immediately after the addition, the z-average molecular weight and distribution were improved, although the molecular weight was not enough to meet the target value. Further increase the amount of JWEB, for example, in experiments 12 and 13, the z-average molecular weight and distribution can be increased again, and the formed material can meet the requirements for molecular weight distribution, but cannot meet the requirements for z-average molecular weight.

[0060] Table III

[0061] Example

Embodiment 14-20

[0063] In these examples, a combination of JWEB and Luperox 531 was used to prepare high Mz materials, and a small amount of Finaclear 530 was used in another experiment. Finaclear 530 is a diblock polystyrene-butadiene copolymer. In certain embodiments, the copolymer is an optional other component. Both methods are known to increase the amount of long chain branching. Use chain transfer agent NDM to improve melt flow and broaden molecular weight distribution.

[0064] Adding NDM can improve the melt flow and broaden the molecular weight distribution. After preparing with this formulation, another experiment was performed with Finaclear 530-Finaclear 530 was added to the formulation of different high molecular weight PS-based resins (Example 18). Previous studies have shown that the addition of a small amount of Finaclear 530 of less than 5% by weight increases the Mz.

[0065] The analysis of the examples and the final pellets are summarized in Table IV. Example 14 established th...

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Abstract

It has been discovered that improved polystyrene products may be obtained by polymerizing styrene in the presence of at least one multifunctional initiator that is trifunctional or tetrafunctional and at least one lower functionality initiator that is difunctional or monofunctional. These polymers may have increased Mz, increased MFI, and increased MWD. Optionally the resin may include at least one chain transfer agent, at least one cross-linking agent and / or a styrene-conjugated diene-styrene block copolymer. The presence of the multifunctional initiator tends to cause more branched structures in the polystyrene.

Description

Invention field [0001] The present invention relates to methods and compositions for improving the preparation of polystyrene and styrene copolymers. More specifically, the present invention relates to the use of multifunctional initiators and low-functionality initiators in the presence of optional crosslinking agents, chain transfer agents and / or block copolymers with styrene-conjugated diene-styrene Methods of polymerizing and copolymerizing polystyrene monomers. Background of the invention [0002] The polymerization of styrene is a very important industrial process, providing materials for forming various polystyrene-containing products. Polystyrene is widely used because of its ability to control the polymerization process. Therefore, changes in polymerization process conditions are extremely important, because these changes can control the physical properties of the polymer produced. The resulting physical properties determine the suitability of polystyrene for specific ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/00
CPCC08F12/08C08F257/02C08F297/04C08F236/06C08F2/38C08F4/36C08F4/38C08J9/00C08F12/02
Inventor D·A·伯尔蒂J·M·索萨J·赖默斯
Owner FINA TECH INC
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