The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 23, 1978
Filed:
Jul. 17, 1975
Fumio Saito, Tsurunosato Ohtsu, JA;
Fumito Yamai, Kusatsu, JA;
Yositugu Beppu, Shiga, JA;
Shinpei Nakayama, Kusatsu, JA;
Sekisui Kagaku Kogyo Kabushiki Kaisha, Osaka, JA;
Sekisui Kaseihin Kogyo Kabushiki Kaisha, Nara, JA;
Abstract
In a suspension polymerization process of preparing styrenic polymer particles from a styrenic monomer and small particles of a styrenic polymer in a definite particle size range, styrenic polymer particles having a uniform particle size are obtained without the formation of fine polymer powders by simultaneously but separately dropwise adding to an aqueous suspension of the small particles of the styrenic polymer (1) a solution of 100 - 60% by weight of a suspension polymerization catalyst and 1 - 10% by weight of the styrenic monomer and (2) a solution of 0 - 40% by weight of the catalyst and 99 - 90% by weight of the styrenic monomer simultaneously but separately from each other.