Method for producing an (meth)acrylate syrup
The present invention provides a method for producing an (meth)acrylate syrup by bulk polymerization which is characterized by: a) using (meth)acrylate ester monomer; and b) using 2,4-diphenyl-4methyl-1-pentenol singly or together with a thiol chain transfer agent as a chain transfer agent, c) initiating polymerization by adding an initiator having the half-life of up to 30 minutes at 55-80° C. of initial reaction temperature, so as to maintain the peak reactor temperature below 95° C. and the reactor conversion rate as 5-50 weight %. The method for producing an (meth)acrylate syrup of the present invention has such advantages that reaction runaway does not occur, the control of molecular weight and conversion rate is possible even at low exothermic temperature without stirring failure, and a partially polymerized (meth)acrylate syrup can also be prepared therefrom.
1. A method for producing an (meth)acrylate syrup comprising the steps of:
a) providing a (meth)acrylate ester monomer for bulk polymerization;
b) providing 2,4-diphenyl-4-methyl-1-pentene together with a thiol chain transfer agent as a chain transfer agent; and
c) initiating bulk polymerization by adding an initiator having the half-life of up to 30 minutes at 55-80° C.;
wherein the initial reaction temperature is 55-80° C.;
wherein the peak reactor temperature is maintained below 85° C.;
wherein the reactor conversion rate as 5-50 weight %; and
wherein molecular weight of the bulk polymerized (meth)acrylate syrup is 220,000-1,200,000.
2. The method for producing an (meth)acrylate syrup as set forth in claim 1 , in which 0.1-100 weight part of every 100 weight part of (meth)acrylate ester monomer is acrylic acid alkyl ester monomer.
3. The method for producing an (meth)acrylate syrup as set forth in claim 1 , in which an initiator is used by 0.0001-0.5 weight part for 100 weight part of(meth)acrylate ester monomer.
4. The method for producing an (meth)acrylate syrup as set forth in claim 1 , in which 2,4-diphenyl-4-methyl-1-pentene was used by 0.001-5.0 weight part for 100 weight part of (meth)acrylate ester monomer.
5. The method for producing an (meth)acrylate syrup as set forth in claim 1 , in which a thiol chain transfer agent is used by 0.00001-5.0 weight part for 100 weight part of (meth)acrylate ester monomer.
6. The method for producing an (meth)acrylate syrup as set forth in claim 1 , in which a partially polymerized (meth)acrylate syrup having 5-98% conversion rate was prepared by adding an initiator once or more.