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A method for preparing styrene and maleimide copolymer using super critical fluid

A technology for maleimide copolymers and maleic anhydride copolymers, which is applied in the field of preparing styrene and maleimide copolymers, and can solve problems such as yield and cost are not effective

Inactive Publication Date: 2006-05-31
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, the above-mentioned supercritical technology is used in a batch reactor, so it is not efficient in terms of productivity and cost

Method used

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  • A method for preparing styrene and maleimide copolymer using super critical fluid
  • A method for preparing styrene and maleimide copolymer using super critical fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] With the rate of 2kg / h, to the feed inlet of co-rotating intermeshing twin-screw extruder, continuously add weight-average molecular weight 180,000, maleic anhydride content is 14wt%, molecular weight distribution is 2.5 and glass transition temperature (Tg) It is a styrene / maleic anhydride copolymer at 135°C. Then, isopropylamine as an imidization agent was added to the cylinder inlet of the mixing zone at a ratio of 1.2 mol of isopropylamine per mol of maleic anhydride. Combine the screws, set the barrel temperature and pressure in the mixing zone to be 220°C and 800psi respectively, so that isopropylamine can exist in a supercritical state (Tc=199°C, Tp=659psi) in the mixing zone. Furthermore, in order to complete the thermal imidization, the temperature of the zone adjacent to the mixing zone was raised to 300°C. Further, unreacted isopropylamine, moisture generated by imidization and other by-products with low molecular weight are removed from the outlet of the cy...

Embodiment 2

[0049] With the speed of 2kg / h, continuously add to the feed port of the co-rotating intermeshing twin-screw extruder, the weight average molecular weight is 180,000, the maleic anhydride content is 14wt%, the molecular weight distribution is 2.5, and the glass transition temperature (Tg) It is a styrene / maleic anhydride copolymer at 135°C. Then, aniline as imidization agent was added to the barrel inlet of the mixing zone at a rate of 1.2 moles of aniline per mole of maleic anhydride. Combine the screws, set the barrel temperature and pressure in the mixing zone to 200°C and 1300 psi, respectively. Carbon dioxide was then continuously introduced into the barrel inlet of the mixing zone while the aniline was being added. Specifically, the pump used to add aniline had a dispensing pressure of 1200 psi, and carbon dioxide was added at 4000 psi in an amount of 15% by weight of the resin by using a syringe pump. The screw rotation speed was 250 rpm. Furthermore, in order to car...

Embodiment 3

[0051] Example 2 was repeated except that the styrene / maleic anhydride had a weight average molecular weight of 180,000 and a maleic anhydride content of 30 wt%, to obtain a styrene / maleimide copolymer. The imidization ratio was 95%. The properties of imide copolymers are shown in Table 1.

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Abstract

The invention discloses a method for preparing a copolymer of styrene and maleimide by using a supercritical fluid through imidization-extrusion of a copolymer of styrene and maleic anhydride. This method can be carried out at a lower temperature than conventional methods and can easily remove residual amines and by-products, thereby providing styrene and maleimide with excellent optical, thermal and mechanical properties. Amine copolymer.

Description

technical field [0001] The present invention relates to a process for the preparation of copolymers of styrene and maleimide. More particularly, the present invention relates to a method for preparing a styrene and maleimide copolymer by imidization of a styrene and maleic anhydride copolymer using a supercritical fluid. Background technique [0002] Generally, in order to improve the heat resistance, thermal stability and processability of styrene and maleimide copolymers, it is necessary to control the maleimide content in the copolymers. However, until now, it has been difficult to control the maleimide content in the copolymer by polymerization methods known in the art. [0003] Meanwhile, it is possible to control the content of maleic anhydride in the styrene and maleic anhydride copolymer. Thus, by using a method of imidizing maleic anhydride in styrene and maleic anhydride copolymers, it is possible to obtain styrene and maleimide with a controllable maleimide cont...

Claims

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Application Information

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IPC IPC(8): C08F283/04C08F6/10C08F8/32C08F212/08C08G
CPCC08F6/10C08F8/32C08F212/08Y02P20/54C08L25/08C08L35/06C08F2/04C08F283/04
Inventor 金东烈朴相炫李喜现
Owner LG CHEM LTD