Fine line electronic micro-circuitry printing pastes

Claim 2

A printing paste according to claim 1 wherein said electronically effective material comprises a glassy binder and a member selected from the group consisting of a conductor, resistor, and dielectric material.

Claim 3

A printing paste according to claim 3 which comprises by weight 10-15 percent carrier vehicle and 50-90 percent electronically effective material.

Claim 4

A printing paste according to claim 3 which comprises by weight 20-24 percent organic liquid, 0.3-0.8 percent inorganic thixotrope, 1.5-4.0 percent binder, 0.06-0.16 percent gelling agent and 70-80 percent electronically effective material.

Claim 5

A printing paste according to claim 5 wherein said electronically effective material comprises a conductor selected from Pd-Au, Pd-Ag, Au, Ag and Pt-Au and a glassy binder.

Claim 6

A printing paste according to claim 6 wherein said glassy binder consists of a pArticulate glass having the following composition by weight: 17.6% SiO2, 16.0% B2O3, 0.4% Al2O3, 60.0% PbO and 5.9% CdO.

Claim 7

A printing paste according to claim 6 wherein said glassy binder consists of particulate Bi2O3 and a particulate glass having the following composition by weight: 17.6% SiO2, 16.0% B2O3, 0.4% Al2O3, 60.0% PbO and 5.9% CdO.

Claim 8

A printing paste according to claim 3 which comprises by weight 20-24 percent organic liquid, 0.5-1.0 percent organic thixotrope, 1.5-4 percent binder and 70-80 percent electronically effective material.

Claim 9

A printing paste according to claim 9 wherein said electronically effective material comprises a conductor selected from Pd-Au, Pd-Ag, Au, Ag and Pt-Au and a glassy binder.

Claim 10

A printing paste according to claim 10 wherein said glassy binder consists of a particulate glass having the following composition by weight: 17.6% SiO2, 16.0% B2O3, 0.4% Al2O3, 60.0% PbO and 5.9% CdO.

Claim 11

A printing paste according to claim 10 wherein said glassy binder consists of particulate Bi2O3 and a particulate glass having the following composition by weight: 17.6% SiO2, 16.0% B2O3, 0.4% Al2O3, 60.0% PbO and 5.9% CdO.

Claim 12

A printing paste according to claim 4 wherein said electronically effective material comprises by weight 3-90 percent glassy binder and the remainder a particulate material selected from a conductor, resistor and dielectric.

Claim 13

A printing paste according to claim 1 in which the carrier vehicle comprises about 65-98 weight percent of a liquid organic solvent selected from the group consisting of diethylene glycol monobutyl ether acetate, isoamyl salicylate and mixtures thereof; about 0.1-10 weight percent of a thixotrope; about 0-35 weight percent of a binding agent; and about 0-0.5 weight percent of a gelling agent.

Claim 14

A printing paste according to claim 14 which also includes a binding agent.

Claim 15

A printing paste according to claim 15 wherein said binding agent is ethyl cellulose.

Claim 16

A printing paste according to claim 15 which also includes a gelling agent.

Claim 17

A printing paste according to claim 14 in which the thixotrope is selected from the group consisting of colloidal silica having an ultrafine average particle size of about 0.015 microns and a solidified hydrogenated castor oil having a particle size of less than about 50 microns.

Claim 18

A printing paste according to claim 14 in which the binding agent is an ethyl cellulose having a viscosity of N-4 to N-200.

Claim 19

A printing paste according to claim 14 in which the gelling agent is a fatty acid amine or a primary cocoanut amine.

Claim 20

A printing paste according to claim 14 in which the solvent comprises 2 parts by weight diethylene glycol monobutyl ether acetate and 1 part by weight iso-amyl salicylate.

Claim 21

A method of producing the paste of claim 1 which includes the step of admixing the electronically effective material with the carrier vehicle before said carrier vehicle gels.

Claim 22

A printing paste for forming printed lines in microelectronic circuitry comprising: a. a carrier vehicle comprising an organic liquid and a thixotrope in an amount sufficient to render a printing paste made therefrom thixotropic to the extent of being printable through a screen or mask and at the same time exhibiting sufficient recovery time and viscosity to maintain the resolution of the lines printed therefrom; and b. an electronically effective material comprising a member selected from the group consisting of a conductor; resistor and dielectric material; and a glassy binder selected from (1) a particulate glass Consisting essentially of by weight about: 17.6% SiO2, 16.0% B2O3, 0.4% Al2O3, 60.0% PbO, and 5.9% CdO and (2) the particulate glass of (1) and particulate Bi2O3; said paste having a screen viscosity index of about 60-1,000, a rest viscosity of greater than about 3,000,000 centipoise at 25* C., a printing shear viscosity of about 10,000-50,000 centipoise at 25* C. and a recovery viscosity of greater than about 2,500,000 centipoise at 25* C.