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:
Oct. 15, 1985
Filed:
Jun. 08, 1984
Applicant:
Inventors:
Takuzo Kasuga, Tokyo, JP;
Takeshi Asano, Fuji, JP;
Yukio Ikenaga, Fuji, JP;
Masami Yamawaki, Fuji, JP;
Yasuyuki Takeda, Fuji, JP;
Koichi Ichimura, Fuji, JP;
Assignee:
Polyplastics Company, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528232 ; 528233 ; 528236 ; 528238 ; 528240 ; 528241 ; 528242 ; 528243 ; 528481 ;
Abstract
A trioxane copolymer is manufactured by adding to trioxane and a co-monomer, 0.0001 to 2.0 percent by weight, based on the total weight of the monomers, of one or more sterically hindered phenols, then co-polymerizing the resultant mixture in the presence of a cation-active catalyst, and then treating the resultant copolymer by heating it at a temperature which is higher than the melting point of the copolymer to melt the copolymer and decompose and remove unstable parts of the copolymer.