Abstract: Fogging and discoloration of multi-pane windows is prevented by sealing the windows with a polymeric seal and by sorbing off-gases evolved by the seal through the use of diatomaceous earth. The diatomaceous earth can be disposed within the volume defined by the panes and the seal, preferably by being disposed within a hollow spacer, or the diatomaceous earth can be mixed with the seal itself. If the diatomaceous earth is mixed with the seal, it can constitute about 1-15 percent by volume of the seal, preferably 1-2 percent by volume. Diatomaceous earth has been found to be especially effective in preventing fogging and discoloration of low emissivity glass.

Abstract: The present invention relates generally to the re-utilization of silicone scrap material. More specifically, the process of the present invention is directed to dissolving silicone scrap in an appropriate solvent and chemically converting the scrap into dimethyl silicone cyclic trimer, tetramer, pentamer and/or the like by means of a two step acid/base catalyzed cracking process.

Abstract: A polyurethane sealant composition is made from a polyurethane prepolymer having blocked isocyanate groups. A 1,8-diaza bicyclo(5:4:0)undecene-7 (DBU) catalyst or a derivative thereof is utilized in association with an amine curing agent having at least two primary amine groups to achieve a relatively fast cure time. The catalyst is a true catalyst in that it merely aids in unblocking the isocyanate groups whereby the curing agent can react therewith.

Abstract: A dimensionally stable sealant and spacer strip comprising an elongated ribbon of deformable sealant enveloping and having embedded therein spacer means extending longitudinally of the ribbon of sealant. The thickness of the enveloping sealant extends beyond the spacer means in an amount sufficient to maintain a continuous sealing interface under applied compressive forces but insufficient to permit substantial distortion of the strip under such applied compressive forces.