Patent ID: 8734687

Claim:
A composition comprising: a) 45 to 99% by weight of quaternary chalcogenide with particle size as measured by D 50% between about 0.1 to about 100 microns and of general formula: (E1) x (E2) y (E3) z (Ch) m , wherein: 1.80≦x≦2.2, and E1 is selected from Cu, Ag, and Au; 0.90≦y≦1.10, and E2 is selected from Zn, Cd, and Hg; 0.90≦z≦1.10, and E3 is selected from Si, Ge, and Sn; and m=4, and Ch is selected from S, Se, Te, and mixtures thereof; b) 0.1 to 5% by weight of a surfactant selected from the group consisting of long-chain sulfonic, phosphonic and carboxylic acid derivatives; c) 0.1 to 55% by weight of a medium selected from wood rosin, mixtures of ethyl cellulose and phenolic resins, polymethacrylates of lower alcohols, and monobutyl ether of ethylene glycol monoacetate; d) 0.0 to 5% by weight of a crosslinker selected from the group consisting of polyalcohols, polyacids and combinations thereof; e) 0.1 to 10% by weight of a rheological additive selected from the group consisting of esters, alcohols, ester alcohols, carbonates, sulfonates, terpenes and phosphates; f) 0.0 to 10% by weight of an elemental chalcogen or source of chalcogen; and wherein the viscosity of the composition is between about 180 and about 250 Pa·s.