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Process for producing metha crylic polymer

A technology based on methacrylic acid and methyl methacrylate, applied in chemical instruments and methods, chemical/physical processes, chemical/physical/physicochemical processes, etc., can solve economic disadvantages and increase industrial-scale capacity, etc. Achieve excellent moldability and high transparency

Inactive Publication Date: 2001-07-11
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires the use of a specific screw agitator in a plug-flow type reactor, so it is disadvantageous from an economic point of view
In addition, this method will be difficult to increase the capacity on an industrial scale

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079]Nitrogen was introduced into the monomer mixture consisting of 98% by weight of purified methyl methacrylate and 2% by weight of methyl acrylate so that its dissolved oxygen content fell to 0.5 ppm. Then, the monomer mixture was mixed with 0.157 mole % (0 / 23 weight percent) of n-octyl mercaptan and 1.0×10 per mole of monomer -5 moles of 1,1-bis(tert-butylperoxy)3,3,5-trimethylcyclohexane (0.003% by weight) as free radical initiator. This raw monomer mixture was continuously conveyed into a controlled full-mixing type reactor so that the polymerization temperature was 135° C., and polymerized therein under stirring.

[0080] At this polymerization temperature, the free radical initiator has a half-life of 230 seconds. Polymerization was carried out in such a way that the average dwell time in the reaction zone was 3.0 hours.

[0081] Then, the reaction mixture was continuously withdrawn from the first reactor. At the built-in SMX Sulzer mixer (manufactured by Sumitomo ...

Embodiment 2-6

[0088] A polymer having the properties shown in Table 3 was obtained in the same manner as in Example 1, except that the starting materials and conditions shown in Tables 1 and 2 were used. In all of Examples 2-6, no problems with polymerization control were encountered during 360 hours of continuous operation. In addition, when the inside of the reactor was observed after the operation was completed, no adhesion of deposits to equipment or formation of extraneous substances was observed.

[0089] The term "post-addition" used in Table 2 means that the initiator is further added at a position in the middle of the direction in which the reaction mixture flows through the plug-flow type reactor after adding the initiator at a position just before the inlet.

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PUM

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Abstract

A process for producing a methacrylic polymer comprising: a step in which bulk polymerization is conducted in one complete mixing type reactor at a temperature of 110 to 160 DEG C using a chain transfer agent in a specific concentration and a free-radical initiator having a specific half-life so as to result in a polymer content of 35 to 65% by weight; a step in which the reaction mixture is continuously discharged from the reactor and sent through a plug flow type reactor while pressurizing the mixture at or above a given value throughout the reactor; a step in which the reaction mixture is passed through a plug flow type reactor having a specific inner-wall temperature while polymerizing the mixture using a free-radical initiator having a specific half-life so as to result in a polymer content at the outlet of 50 to 85% by weight; and a subsequent step in which volatiles are continuously removed from the reaction mixture. By the process, a methacrylic polymer having excellent moldability can be efficiently produced.

Description

technical field [0001] The present invention relates to a method for the continuous production of methacrylic polymers by means of bulk polymerization. Background technique [0002] Compared with batch suspension polymerization, it has more excellent productivity; because it does not need dispersant or other auxiliary agents, the resulting polymer has high transparency; because it does not need to separate the reaction solvent compared with solution polymerization; Since there is no residual solvent in the polymer after removal of volatile substances, the resulting polymer has high transparency; since the amount of free radical initiator supplied to the reaction zone can be very small, excellent resistance is obtained. Thermally decomposable polymers; therefore, continuous polymerization of polymethyl methacrylate by means of bulk polymerization has long been researched and developed. [0003] On the other hand, the reason why solution polymerization...

Claims

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Application Information

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IPC IPC(8): C08F2/00B01J19/00B01J19/24C08F2/01C08F2/02C08F2/04C08F2/06C08F2/38C08F6/10C08F20/12C08F20/14
CPCC08F20/14B01J19/0053B01J2219/00779B01J19/2415C08F2/02C08F20/12
Inventor 沟田浩敏村上智成佐佐木茂明石坂浩二
Owner MITSUBISHI CHEM CORP
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