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A process for preparation of polyglutarimide resin using a fluid of super critical condition

A polyglutarimide and supercritical fluid technology, applied in the production of bulk chemicals, etc., can solve problems such as difficulty in removing extractant and bubbles in extruded filaments.

Inactive Publication Date: 2006-04-19
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has a disadvantage in that since a solvent having a relatively low vapor pressure solvent such as water or alcohol is used, it is difficult to remove the extractant; if the extractant cannot be sufficiently removed, the extruded strand may be Bubbles; and spent solvent needs to be safely disposed of after use as extractant

Method used

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  • A process for preparation of polyglutarimide resin using a fluid of super critical condition
  • A process for preparation of polyglutarimide resin using a fluid of super critical condition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Feed continuously to one inlet of a co-rotating complete mesh-type twin screw extruder having a diameter of 27 mm and a length of 1296 mm, having a weight average molecular weight of 160,000 and a glass transition temperature of 112°C ( Tg), and a methyl methacrylate / methyl acrylate copolymer (hereinafter referred to as methacrylic resin) comprising methyl methacrylate and methyl acrylate in a weight ratio of 96:4, and at a screw rotation speed of 200 rpm Next, methylamine as an imidization agent is added at 13 / 48 of the corresponding screw along the extrusion direction of the resin to carry out the imidization reaction.

[0057] The reverse combined screw is inserted in the range of 29 / 48~37 / 48 of the full length of the corresponding screw along the extrusion direction, so that the extraction area of ​​supercritical carbon dioxide can be formed, and under the average pressure of 4000psi, the carbon dioxide can be extracted based on the An amount of 2.1% by weight of th...

Embodiment 2～4 and comparative Embodiment 2～4

[0067] Examples 2 to 4 and Comparative Examples 2 to 4 were carried out as described in Example 1 and Comparative Example 1, respectively, except that the type of imidization reagent was changed as shown in Table 2 below.

[0068] Table 2 below describes the reaction conditions, degree of reaction, glass transition temperature and residual amine content in Examples 2-4 and Comparative Examples 2-4.

[0069]

[0070] As shown in Table 2, Examples 2-4 respectively reduced the amount of residual amine compared with Comparative Examples 2-4.

Embodiment 5～11

[0072] Example 1 was repeated except that the screw rotation speed was 250 rpm and the type of imidization reagent and the added amount of carbon dioxide were changed as shown in Table 3 below.

[0073] Amine type

[0074] As shown in Table 3, the more carbon dioxide added, the more the residual amine content in the polyglutarimide was reduced.

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Abstract

Disclosed is a method for preparing a polyglutarimide by reacting an acrylic resin with an imidizing agent. The method uses a supercritical fluid, preferably supercritical carbon dioxide' to remove unreacted materials and by-products, and thus can provide a polyglutarimide having excellent optical properties.

Description

technical field [0001] The present invention relates to a method for preparing polyglutarimide by imidizing acrylic resin. More specifically, the present invention relates to a method for producing polyglutarimide by imidizing an acrylic resin, wherein unreacted substances and by-products are efficiently removed to produce polyglutarimide having excellent optical properties imide. Background technique [0002] In general, acrylic resins have excellent optical properties and wea thering resistance, and can be produced at low cost. However, they have low heat resistance and thus limit their applications. Therefore, since the 1930s, many acrylic resin production companies, including DUPONT in the United States, have made a large number of attempts to overcome this shortcoming. [0003] For example, conventional methods for improving the heat resistance of acrylic resins include introducing into the backbone of acrylic resins highly polar functional groups capable of increasi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/00C08G73/10C08F20/00C08F8/32C08F8/00
CPCC08F8/00C08G73/10Y02P20/54C08F20/00C08G73/00
Inventor 朴相炫金东烈李喜现李敏熙
Owner LG CHEM LTD
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