Ostrolenk, Faber, Gerb & Soffen, LLP
Crystalline glass composition for use in circuit board, sintered crystalline glass, insulator composition insulating paste and thick film circuit board
 Provided is a crystalline glass composition for use in a circuit board that can be sintered at a temperature of 1100.degree. C. and is endowed with favorable characteristics such as a relative dielectric constant of as low as 1/2 and a thermal expansion coefficient of as high as 12 ppm/.degree. C. as an electrical insulating insulator for use in a circuit board. The crystalline glass composition contains SiO.sub.2, MgO and CaO, the composition ratio of SiO.sub.2, MgO and CaO in % by weight falling within an area surrounded by the lines connecting the points A (25, 45, 30), B (25, 0, 75), C (44, 0, 56), D (44, 22, 34), E (40, 19, 41) and F (29, 40, 31) in a ternary phase diagram wherein at least one melwinite, monticellite or calcium silicate crystalline phase is deposited by heat-treating the composition. A ceramic powder having a thermal expansion coefficient of about 6.0 ppm/C or more is sometimes added in the powder comprising the glass composition. 
Murata Manufacturing Co., Ltd.
H H Y H H C H H
H01L H01L Y10T H01L H01L C03C H05K H01L
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Hirofumi Hiromichi Shizuharu Toshiki Hiroshi
Sunahara Kawakami Watanabe Tanaka Takagi