Method for producing (meth)acrylic resin composition

Patent metadata

Field	Value
Publication number	US-9914796-B2
Application number	US-201314411653-A
Country	US
Kind code	B2
Filing date	Jun 28, 2013
Priority date	Jun 29, 2012
Publication date	Mar 13, 2018
Grant date	Mar 13, 2018

Abstract

A method of producing a (meth)acrylic resin composition. The method comprises a step of continuously feeding a monomer mixture comprising 80 to 100% by mass of methyl methacrylate and 20 to 0% by mass of an alkyl acrylate to a tank reactor and bulk polymerizing the monomer mixture until obtaining a polymerization conversion of 40 to 70% by mass to prepare a reaction product; continuously discharging the reaction product, and heating the reaction product to 200° C. to 270° C. with a heater, and then separating the unreacted monomer with a extruder equipped with a vent; and transferring the separated unreacted monomer entrained by an inert gas flow to reuse the separated unreacted monomer as a raw material of the monomer mixture.

First claim

The invention claimed is:

1. A method of producing a (meth)acrylic resin composition, the method comprising:
continuously feeding a monomer mixture comprising 80 to 100% by mass of methyl methacrylate and 20 to 0% by mass of an alkyl acrylate to a tank reactor and bulk polymerizing the monomer mixture until obtaining a polymerization conversion of 40 to 70% by mass to obtain a reaction product;
continuously discharging the reaction product, and heating the reaction product to 200° C. to 270° C. with a heater, and then separating the unreacted monomer with a extruder equipped with a vent; and
transferring the separated unreacted monomer entrained by an inert gas flow to reuse the separated unreacted monomer as a raw material of the monomer mixture;
wherein a reaction solution in the tank reactor has a water content of 1,000 ppm or less.

2. The method according to claim 1 , wherein the separated unreacted monomer is in a gas state and is entrained by the inert gas flow.

3. The method according to claim 1 , wherein the separated unreacted monomer has a b* value within a range of −0.5 to 1.5.

4. The method according to claim 2 , wherein the separated unreacted monomer has a b* value within a range of −0.5 to 1.5.

5. A method of producing a (meth)acrylic resin composition, the method comprising:
continuously feeding a monomer mixture comprising 80 to 100% by mass of methyl methacrylate and 20 to 0% by mass of an alkyl acrylate to a tank reactor and bulk polymerizing the monomer mixture until obtaining a polymerization conversion of 40 to 70% by mass to obtain a reaction product;
continuously discharging the reaction product, and heating the reaction product to 200° C. to 270° C. with a heater, and then separating the unreacted monomer with a extruder equipped with a vent; and
transferring the separated unreacted monomer entrained by an inert gas flow to reuse the separated unreacted monomer as a raw material of the monomer mixture;
wherein the temperature in the tank reactor is 120° C. to 150° C.; and the mean residence time in the heater is 2 minutes or less.

6. The method according to claim 5 , wherein the separated unreacted monomer has a b* value within a range of −0.5 to 1.5.

7. The method according to claim 5 , wherein the reaction solution in the tank reactor has a water content of 1000 ppm or less.

8. A method of producing a (meth)acrylic resin composition, the method comprising:
continuously feeding a monomer mixture comprising 80 to 100% by mass of methyl methacrylate and 20 to 0% by mass of an alkyl acrylate to a tank reactor and bulk polymerizing the monomer mixture until obtaining a polymerization conversion of 40 to 70% by mass to obtain a reaction product;
continuously discharging the reaction product, and heating the reaction product to 200° C. to 270° C. with a heater, and then separating the unreacted monomer with a extruder equipped with a vent; and
transferring the separated unreacted monomer entrained by an inert gas flow to reuse the separated unreacted monomer as a raw material of the monomer mixture;
wherein:
the temperature in the tank reactor is 120° C. to 150° C.;
the mean residence time in the heater is 2 minutes or less; and
the separated unreacted monomer is in a gas state and is entrained by the inert gas flow.

9. The method according to claim 6 , wherein the reaction solution in the tank reactor has a water content of 1000 ppm or less.

10. The method according to claim 8 , wherein the separated unreacted monomer has a b* value within a range of −0.5 to 1.5.

11. The method according to claim 8 , wherein the reaction solution in the tank reactor has a water content of 1000 ppm or less.

12. The method according to claim 10 , wherein the reaction solution in the tank reactor has a water content of 1000 ppm or less.

Assignees

• Kuraray Co

Inventors

• Ozawa Hiroshi
• Tanaka Shouji
• Kitade Yasuhito

Classifications

• C08F220/14

  Methyl esters {, e.g. methyl (meth)acrylate} · CPC title

• C08F6/005 Primary

  from solid polymers · CPC title

• G02B1/045

  Light guides · CPC title

• C08F2/02 Primary

  Polymerisation in bulk · CPC title

• C08F120/14

  Methyl esters {, e.g. methyl (meth)acrylate} · CPC title