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:
Dec. 12, 2017
Filed:
May. 30, 2012
Tomoya Oshikiri, Yokohama, JP;
Atsushi Yasuda, Yokohama, JP;
Tomoya Oshikiri, Yokohama, JP;
Atsushi Yasuda, Yokohama, JP;
Mitsubishi Chemical Corporation, Tokyo, JP;
Abstract
The time when at least a monomer and a chain transfer agent are supplied in a reactor and the solution temperature in the reactor has reached a predetermined polymerization temperature is set as starting time (T), and the time when a process to terminate the polymerization is started is set as ending time (T). A polymerization initiator is supplied into the reactor between (T) and just before [(T)−(T)/2] and between [(T)−(T)/2] and (T). The total mass of the polymerization initiator supplied to the reactor between (T) and (T) is set as (I), and the total mass of the polymerization initiator supplied between [(T−T)/2] and (T) is set as (I). The (I) is set 50 to 100 mass % of the entire polymerization initiator. Using a production method in which 0.50<(I)/(I)<1.00 is satisfied, a polymer is produced at a high polymerization rate showing less variation of molecular weight and having less amount of chain transfer agent residue remaining at an end of the polymer chain.