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:
Mar. 28, 1978
Filed:
Jul. 08, 1976
Ichiro Tokumitsu, Tokuyama, JA;
Hideo Konuma, Tokuyama, JA;
Shigeaki Mochizuki, Tokuyama, JA;
Yoshio Okada, Tokuyama, JA;
Hiroshi Yasumoto, Tokuyama, JA;
Isao Yoshihiro, Tokuyama, JA;
Idemitsu Petrochemical Co., Ltd., Tokyo, JA;
Abstract
In the method for producing a high impact polystyrene from a monomer of styrene or/and its derivative and a rubbery polymer as reactants, an improvement is provided which comprises passing said reactants through a tubular reactor having parts where the passage way of flow of said reactants is constricted, while keeping said reactants in a laminar flow as much as possible in the parts other than said parts, in a first stage polymerization to prepare a reacted mixture containing a prepolymer until the conversion of monomer to polymer becomes 10 to 60%, and subjecting the resulting reacted mixture to a second stage polymerization in the state where almost no shearing is exerted thereupon. The shearing during said first stage polymerization can be uniformly carried out. The resulting product has superior high impact properties.