Azobisisobutyronitrile → Propylene glycol methyl ether acetate

Participants

Reaction Conditions

Reaction Steps

A monomer solution was prepared by placing 8000 g of MEK in a tank kept at a nitrogen atmosphere and dissolving 2080 g of (B) NLA, 2480 g of (A) EAM and 2220 g of 3-hydroxy-1-adamantyl acrylate (hereinafter inscribed as “HAA”). Also, a polymerization initiator was prepared by placing and dissolving 1000 g of MEK and 110 g of AIBN in another container kept at the nitrogen atmosphere. Into a polymerization tank kept at the nitrogen atmosphere, 5000 g of MEK was put and the temperature was raised to 80° C. with stirring. Subsequently, the monomer solution and the polymerization initiator solution kept at the temperature of 25 to 30° C. were fed into the polymerization tank kept at 80° C. over 4 hours, respectively. After the completion of feed, the polymerized solution was matured for 2 hours with keeping the polymerization temperature at 80° C., then cooled to room temperature and taken out. Polymer was precipitated from the resulting polymerized solution by dropping in 100 kg of aqueous methanol and filtrated. The resultant wet cake was washed with 100 kg of methanol, filtrated subsequently dissolved in MEK again, and passed through a filter 40QSH supplied from Cuno Incorporated to remove a trace amount of metals. Then, the solvent was replaced by PGMEA with removing MEK by heating under reduced pressure to pre-pare PGMEA solution containing 15% polymer. The features of the resultant polymer, the content of high polymer and the evaluation results of storage stability of PGMEA solution are shown in Table 1.

Provenance & Evidence