Patent ID: 7699999
Filing Date: 2010-04-20
Classification: B01D,B01J,H01L

Abstract:
1. An article comprising a substrate bonded with a sintered thick film hygroscopic getter composition, said thick film hygroscopic getter composition consisting of: (a) hygroscopic bismuth silicate-based glass frit comprising more than 69 wt. % Bi (b) organic medium comprising an organic polymeric binder and a volatile organic solvent, wherein the organic polymeric binder is selected from the group consisting of ethyl cellulose, ethylhydroxyethyl cellulose, wood rosin, mixtures of ethyl cellulose and phenolic resins, polymethacrylates of lower alcohols, monobutyl ether of ethylene glycol monoacetate, and mixtures thereof; wherein the volatile organic solvent is selected from the group consisting of ethyl acetate, terpenes, kerosene, dibutylphthalate, butyl carbitol, butyl carbitol acetate, hexylene glycol, high boiling alcohols, alcohol esters, and mixtures thereof, and; wherein said thick film hygroscopic getter composition is bonded to the substrate by depositing the thick film hygroscopic getter composition onto the substrate, followed by volatilizing the organic medium and sintering the glass frit to form an essentially non-porous layer of thickness from 10 μm to 25 μm.