Method of producing a sealing glass composition with a uniform viscosity

Claim 1

IN A METHOD OF PRODUCING A SOLDER GLASS COMPOSITION OF UNIFORM VISCOSITY WHICH COMPRISES ADDING AND MIXING A SOLDER GLASS FRIT WITH A CARRIER VEHICLE CONSISTING ESSENTIALLY OF A BINDER FOR SAID FRIT AND A SOLVENT FOR SAID BINDER, THE IMPROVEMENT COMPRISING ADDING AT A TEMPERATURE OF ABOUT 32* TO 100*F. TWO-THIRDS BY WEIGHT OF THE SOLDER GLASS FRIT TO THE CARRIER VEHICLE AT A RATE OF FROM 1 TO 1.875 PARTS BY WEIGHT OF THE SOLDER GLASS FRIT PER MINUTE FOR EACH PART BY WEIGHT OF THE CARRIER VEHICLE WHILE CONCURRENTLY MIXING THE SAME AT A MIXING VEHICLE WEIGHT RATIO OF FROM ABOUT 7.3:1 TO ABOUT 8.7:1 AND THEN ADDING THE REMAINING ONE-THIRD OF THE SOLDER GLASS FRIT TO THE CARRIER VEHICLE AT A ARATE OF FROM 1 TO 1.875 PARTS BY WEIGHT OF THE SOLDER GLASS FRIT PER MINUTE FOR EACH PART BY WEIGHT OF THE CARRIER VEHICLE WHILE CONCURRENTLY MIXING THE SAME AT A MIXING SPEED OF 1,500 TO 1.900 REVOLUTION PER MINUTE.

Claim 19

A method of preparing a solder glass paste composition possessing properties of uniform viscosity and improved stability, said method comprising: a. providing a carrier vehicle consisting essentially of 95 parts by weight of a 1.3 by weight solution of nitrocellulose having a molecular weight of about 100,000 in amyl acetate together with 5 parts by weight of a 4% by weight solution of hydroxypropylcellulose in equal parts by weight of amyl acetate and ethyleneglycol monomethylether, b. providing a particulate solder glass frit having a composition within the compositional weight percent range of 75 to 82% PbO, 7 to 14% ZnO, 6 to 12% B2O3 and 1 to 3% SiO2 and possessing a particle size distribution such that essentially all of the particles of solder glass frit pass through a 100 mesh screen and such that about 25 to 30% of the particles of solder glass frit are retained on a 400 mesh screen, both as measured by the U.S. Standard Sieve Series of 1940, and such that the surface area of the particles varies from a minimum of about 1.5 to a maximum of about 2.0 square meters per cubic centimeter, c. stirring said carrier vehicle in a blade-type mixing vessel at a blade stirring speed of about 400 to 850 revolutions per minute while concurrently adding a sufficient amount of solder glass frit to said carrier vehicle to provide a solder glass frit to carrier vehicle ratio of from about 7.3 to about 8.7 parts by weight of solder glass frit to one part by weight of carrier vehicle, the addition of solder glass frit to carrier vehicle being a rate of addition per minute of 1 to 1.875 parts by weight of solder glass frit to one part by weight of carrier vehicle, d. thereafter increasing the stirring speed to a blade stirring speed of from about 1,500 to 1,900 revolutions per minute while concurrently adding sufficient amount of said solder glass frit at a rate of addition per minute of 1 to 1.875 parts by weight of solder glass frit to one part by weight of carrier vehicle to produce a solder glass frit to carrier vehicle ratio of from about 11 to about 13 parts by weight of solder glass frit to one part by weight of carrier vehicle.

Claim 20

A method of preparing a solder glass paste composition possessing properties of uniform viscosity and improved stability, said method comprising: a. providing a carrier vehicle consisting essentially of 95 parts by weight of a 1.3 by weight solution of nitrocellulose having a molecular weight of about 100,000 in amyl acetate together with 5 parts by weight of a 4% by weight solution of hydroxypropylcellulose in equal parts by weight of amyl acetate and ethyleneglycol monomethylether, b. providing a particulate solder glass frit having a composition within the compositional weight percent range of 75 to 82% PbO, 7 to 14% ZnO, 6 to 12% B2O3 and 1 to 3% SiO2 and possessing a particle size distribution such that essentially all of the particles of solder glass frit pass through a 100 mesh screen and such that about 25 to 30% of the particles of solder glass frit are retained on a 400 mesh screen, both as measured by the U.S. Standard Sieve Series of 1940, and such that the surface area of the particles varies from a minimum of about 1.5 to a maximum of about 2.0 square meters per cubic centimeter, c. stirring said carrier vehicle in a blade-type mixing vessel at a blade stirring speed of about 400 to 850 revolutions per minute while concurrently adding a sufficient amount of solder glass frit to said carrier vehicle to provide a solder glass frit to carrier vehicle ratio of from about 7.3 to about 8.7 parts by weight of solder glass frit to one part by weight of carrier vehicle, the addition of solder glass frit to carrier vehicle being a rate of addition per minute of 1 to 1.875 parts by weight of solder glass frit to one part by weight of carrier vehicle, d. thereafter increasing the stirring speed to a blade stirring speed of from about 1,500 to 1,900 revolutions per minute while concurrently adding sufficient amount of said solder glass frit at a rate of addition per minute of 1 to 1.875 parts by weight of solder glass frit to one part by weight of carrier vehicle to produce a solder glass frit to carrier vehicle ratio of from about 11 to about 13 parts by weight of solder glass frit to one part by weight of carrier vehicle.