Patent ID: 6118671
Filing Date: 2000-09-12
Classification: C03C,H01L,H05K,Y10S

Abstract:
A process of manufacturing a circuit substrate, comprising the steps of:preparing a slurry by mixing glass, filler, organic binder, and solvent,forming a green sheet from said slurry,forming a conductor by forming via holes and wiring using conducting material on said green sheet, andheating said green sheet at 700.degree. to 880.degree. C. to remove the binder, followed by heating at 900.degree. to 1,050.degree. C. to sinter,wherein said glass contains SiO.sub.2, B.sub.2 O.sub.3, and R.sub.2 O (R represents alkali metal), and has a composition included in an area, in a triangular composition diagram of SiO.sub.2 --B.sub.2 O.sub.3 --R.sub.2 O, defined with five lines comprising a line connecting a point of first composition and a point of third composition, a line connecting the point of third composition and a point of tenth composition, a line connecting the point of tenth composition and a point of eleventh composition, a line connecting the point of eleventh composition and a point of fourth composition, and a line connecting the point of fourth composition and the point of first composition (the area includes the lines),wherein a total weight of SiO.sub.2, B.sub.2 O.sub.3, and R.sub.2 O is 100%,the first composition consists of 88% by weight of SiO.sub.2 and 12% by weight of B.sub.2 O.sub.3,the third composition consists of 82% by weight of SiO.sub.2 and 18% by weight of B.sub.2 O.sub.3,the tenth composition consists of 84% by weight of SiO.sub.2, 10% by weight of B.sub.2 O.sub.3, and 6% by weight of R.sub.2 O,the eleventh composition consists of 90% by weight of SiO.sub.2, 5% by weight of B.sub.2 O.sub.3, and 5% by weight of R.sub.2 O, andthe fourth composition consists of 89% by weight of SiO.sub.2, 10% by weight of B.sub.2 O.sub.3, and 1% by weight of R.sub.2 O.