Ppg Industries, Inc.

Helmut Franz

Paul F Duffer

Joseph D Kelly

James H Hanlon

Lloyd G Shick

George B Goodwin

Fred A Fortunato

James C Vanek

Gary J Marietti

Glenn E Freeman

Peter T Dishart

James E Sickles

Robert T Shumaker, Jr

James F Wilson

Barry L Shadle

Frank J Pazul

Joseph V Hornyak

The present invention provides a method of forming a desired pattern with a coating on a substrate. The method includes the steps of applying a water soluble resist material in a predetermined pattern to a surface of a substrate, drying the resist material, depositing a coating on the surface of the substrate to form a coated substrate, wherein a portion of the coating overlays the resist material, and dissolving the resist material on the coated substrate with water to remove the resist material and corresponding overlaying coating and form a desired coating pattern on the substrate surface. The dissolving step preferably includes the step of directing high temperature and high pressure water sprays at the surface of the coated substrate to wash off the resist and corresponding overlaying coating. The removal of the resist material may include a prewash operation wherein the surface of the substrate is wetted with water and coating is allowed to soak. The present invention also discloses a resist material for masking selected portions of a glass sheet to form a desired coating pattern. The resist material includes 1-20 wt. % water soluble polymer film former, 0 to 3 wt. % surfactant, 0 to 5 wt. % rinse aid and a solvent. The film former, surfactant and rinse aid are preferably all soluble in the solvent. In one particular embodiment of the invention, the film former is selected from a group consisting of polyvinylpyrrolidone, polyvinylalcohol, sodium alginate, hydroxyethyl cellulose and combinations thereof, the rinse agent is selected from a group consisting of sodium bicarbonate, sodium hydrogen phosphate, sodium sulfate, inorganic salts and combinations thereof, and the solvent is water, an organic solvent or a combination thereof.

Resist material for deletion of coatings

The present invention discloses a method of reducing marking of a heat softened glass sheet which results when portions of the sheet are contacted by glass sheet handling equipment. The portions of the sheet susceptible to marking are sprayed with an inert material having a melting point and decomposition temperature of at least 1200.degree. F. to form a layer that protects the sheet portion against marking from the equipment. In one particular embodiment of the invention, the lower major surface of a glass sheet is sprayed with an aqueous solution of sodium sulfate to form a layer of sodium sulfate along the glass surface which protect against marking of the glass by conveyor rolls.

Method of reducing glass sheet marking

A method and composition are disclosed for applying an organic acid-containing aqueous composition to a glass surface to prevent staining thereof wherein a wetting agent is employed to provide uniform and complete wetting of the glass surface with a uniform continuous film of said organic acid-containing aqueous composition.

Method and composition for applying acidic interleaving material in

An organic acid anti-staining composition for glass sheets is disclosed herein whereby the corrosive effects of very low pH are eliminated by buffering the organic acid. The buffered organic acid has a less acidic pH, but is as effective as unbuffered organic acid in neutralizing alkali formed by sodium from the glass to prevent staining of the glass surface.

Buffered acid interleaving for glass sheets

The present invention provides a multiple nozzle liquid spray assembly having a longitudinally extending bar member, receivers to allow securing of nozzles along the bar, a coolant conduit extending along at least a portion of the bar, liquid and gas conduits extending along the bar in close proximity to each of the receivers, and first and second sets of passages interconnecting each of the receivers with the liquid or gas conduits. In one particular embodiment of the invention, the coolant conduit includes a first portion which extends from a coolant inlet along a first longitudinal side of the bar member and a second portion which extends from a coolant outlet along an opposing longitudinal side of the bar member. The liquid conduit and gas conduit generally parallel each other and extend along the bar member between the first and second portions of the cooling conduit.

Low profile spray assembly

A method and article are disclosed wherein a plastic substrate is provided with a more durable non-wetting surface by deposition of a silica primer layer prior to treatment with perfluoroalkylalkylsilane and optionally a fluorinated olefin telomer on the surface which comprises the silica primer layer.

Water repellent surface treatment for plastic and coated plastic

A method and article are disclosed wherein a metal, polymeric or inorganic coated substrate is provided with a durable non-wetting surface by treatment with a perfluoroalkyl alkyl silane and a fluorinated olefin telomer.

Water repellent surface treatment

A method is disclosed for providing a temporary layer of a release agent on a substrate such as glass by applying a liquid dispersion of solid particles which do not bond to the glass or form a film and evaporating the liquid to yield a layer of loosely adherent particles on the substrate surface.

Removable release agent on glass and bonding method employing same

A method is disclosed providing temporary protection of a glass surface from staining and scratches by coating the exposed surface with a soluble polymer film incorporating spacer particles of an inert material.

Soluble polymer interleaving material

A method is disclosed wherein a glass substrate is provided with a durable non-wetting surface by treatment with a perfluoroalkyl alkyl silane and a fluorinated olefin telomer.

Method of using perfluoroalkylsilanes to lower the surface energy of

A method and article are disclosed wherein a glass substrate is provided with a durable non-wetting surface by treatment with a perfluoroalkyl alkyl silane and a fluorinated olefin telomer.

Chemically reacted glass surface

A method is disclosed for applying a powdered interleaving material to a glass surface in the form of an aqueous composition comprising particulate interleaving material dispersed in atomized water.

Method of applying interleaving material to glass sheets

A method is disclosed for protecting a substrate surface from particulate contaminants in a process using a working tool in conjunction with a working fluid, by employing as the working fluid a solution of a soluble polymer such as polyvinylpyrrolidone.

Polymer solution working fluid for finishing processes

A method and composition utilizing porous particulate interleaving material treated with a strong organic acid are disclosed to reduce staining of stacked glass sheets.

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Pittsburgh, PA, United States of America

Helmut Franz