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. 21, 1997
Filed:
Jul. 28, 1995
Tamotsu Ishida, Fujieda, JP;
Eiji Funatsu, Fujieda, JP;
Sumitomo Bakelite Company Limited, Tokyo, JP;
Abstract
The present invention provides a process for injection molding a phenolic resin molding material which includes injection molding a phenolic resin molding material having a melt viscosity of 10.sup.4 Pa.cndot.s or lower, preferably 10.sup.3 Pa.cndot.s or lower at 100.degree. C. by an injection molding machine having a screw of 1.5 or higher in compression ratio and/or provided with a back-flow stopping ring at the tip portion of the screw. According to the present invention, it is possible to carry out injection molding of phenolic resin molding materials with injection molding machines generally used for molding of thermoplastic resins by employing phenolic resin molding materials which are low in viscosity in molten state. Furthermore, the injection molding can be carried out under relatively low pressure and thus, occurrence of flash can be inhibited.