Polysilazane-derived coating for glass containers

A process for forming an inorganic silica coating on a glass container to improve one or more surface characteristics of the glass container, the process including:

• (a) providing a glass container that includes a glass substrate having an exterior surface, the glass substrate providing the glass container with a closed base, a circumferentially-closed body extending in an axial direction from the closed base, and an open mouth, and wherein a hot-end coating that comprises oxides of tin, titanium, vanadium, or zirconium is applied directly to and over the exterior surface of the glass substrate;
• (b) applying a sol-gel solution including a perhydropolysilazane and a solvent to the glass substrate over the hot-end coating to form a sol-gel coating thereon, wherein the sol-gel solution has a viscosity of less than 20 cP;
• and
• (c) heating the glass container and the sol-gel coating in a water vapor-containing environment having a temperature between 150 degrees Celsius and 600 degrees Celsius to form an inorganic silica coating on the hot-end coating applied to the exterior surface of the glass substrate, wherein the silica coating is more hydrophilic than the glass substrate and has a hardness greater than 8.5 GPa.

A process for forming an inorganic silica coating on a glass container to improve one or more surface characteristics of the glass container, the process including:

• (a) providing a glass container that includes a glass substrate having an exterior surface, the glass substrate providing the glass container with a closed base, a circumferentially-closed body extending in an axial direction from the closed base, and an open mouth;
• (b) applying a sol-gel solution including a perhydropolysilazane and a solvent over the exterior surface of the glass substrate to form a sol-gel coating thereon, wherein the sol-gel solution has a viscosity of less than 20 cP;
• and
• (c) heating the glass container and the sol-gel coating in a water vapor-containing environment having a temperature between 150 degrees Celsius and 600 degrees Celsius to form an inorganic silica coating over the exterior surface of the glass substrate, wherein the silica coating is more hydrophilic than the glass substrate and has a hardness greater than 8.5 GPa.