Title: Process for preparing copolymer of acrylonitrile and aromatic vinyl compound

Abstract: A process for preparing a copolymer of acrylonitrile and an aromatic vinyl compound such as styrene having a well-balanced combination of color, transparency and softening point by suspension polymerization in the presence of about 0.01 to 0.5% of an azo-type catalyst and about 0.005 to 0.2% of an organic peroxide catalyst free from a benzene ring, both based on the weight of the monomers where the polymerization is carried out at a temperature of 90.degree. to 110.degree.C until a monomer conversion of about 70% is obtained, and when the monomer conversion exceeds 70%, the polymerization is carried out at a temperature of 110.degree. to 140.degree.C.

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Inventors: Takizawa, Hidehiko (Ichihara, JA)
Hisashige, Mitsuto (Ichihara, JA)

Application Number: 465655
Filing Date: 1974-04-30
Publication_date: 1976-01-06
Assignee: Denki Kagaku Kogyo Kabushiki Kaisha (Tokyo, JA)
Primary Class(es): 526/219.1 526/219, 526/219.2, 526/219.3, 526/342
Other Classes:
US Patent Ref:

2658057	Nov, 1953	Park	260/85.
3032540	May, 1962	Ross et al.	260/85.
3198775	Aug, 1965	Delacretaz	260/85.
3738972	Jun, 1973	Moriyama et al.	260/85.
3763128	Oct, 1973	Lewis et al.	260/89.

Other Refs:
Primary Examiner: Schofer, Joseph L.
Assistant Examiner: Tungol, Maria S.
Attorney: Sughrue, Rothwell, Mion, Zinn & Macpeak