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. 02, 1997
Filed:
Feb. 08, 1996
Applicant:
Inventors:
Lee-Ching Kuo, Hsinchu, TW;
Jinn-Shing King, Taipei, TW;
Wen-Yueh Hsu, Hsinchu, TW;
Yu-Tai Tsai, Taichung, TW;
Assignee:
Industrial Technology Research Institute, Hsinchu, TW;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08G / ; B05D / ; C08F / ; C08J / ;
U.S. Cl.
CPC ...
528350 ; 528125 ; 528126 ; 528128 ; 528171 ; 528173 ; 528174 ; 528179 ; 528183 ; 528185 ; 528220 ; 528229 ; 528353 ; 427 58 ; 427 69 ; 427487 ; 427496 ; 427497 ; 427503 ; 427504 ;
Abstract
The present method provides a method for preparing the PI varnish which has the steps of: 1) preparing a mixed solution of 60-100% by weight aprotic solvent, and 0-40% by weight aromatic solvent; 2) adding into the mixed solution in a mole ratio of 1:9 two aromatic diamines; and 3) further adding in the mixed solution in a mole ratio of 1:5 two aromatic dianhydrides. Such PI has a suitable thermal expansion coefficient and characteristics different form those of the PI currently in use.