Preparation of differential thickness coatings by dip coating where the substrate is pivoted
First Claim
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1. A process for differentially coating a substrate, comprising the steps of:
- A) immersing at least a portion of the substrate into a coating medium; and
B) simultaneously performing the steps of;
(i) withdrawing the substrate from the coating medium in a predetermined direction at a predetermined rate; and
(ii) pivoting the substrate at a predetermined angular velocity about an axis orthogonal to the direction of withdrawal at a predetermined angular velocity selected to effect a differential coating of the coating medium on the substrate.
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Abstract
A substrate, bearing a coating having a thickness which varies in more than one direction across the surface of the substance, is prepared by a process wherein the substrate is immersed into a coating medium bath, then withdrawn in a predetermined direction and at a predetermined rate, and simultaneously pivoted at a predetermined angular velocity about an axis which is orthogonal to the direction of withdrawal.
68 Citations
12 Claims
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1. A process for differentially coating a substrate, comprising the steps of:
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A) immersing at least a portion of the substrate into a coating medium; and B) simultaneously performing the steps of; (i) withdrawing the substrate from the coating medium in a predetermined direction at a predetermined rate; and (ii) pivoting the substrate at a predetermined angular velocity about an axis orthogonal to the direction of withdrawal at a predetermined angular velocity selected to effect a differential coating of the coating medium on the substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A process for differentially coating an automotive glazing, comprising the steps of:
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A) immersing at least a portion of the glazing into a coating medium; and B) simultaneously performing the steps of; i) withdrawing the glazing from the coating medium in a direction normal to the surface of the coating medium at a predetermined rate from about 1 to about 75 centimeters per minute; and ii) pivoting the glazing about an axis orthogonal to the direction of withdrawal at a predetermined angular velocity from about 1 to about 75 centimeters per minute selected to effect a differential coating of the coating medium on the substrate. - View Dependent Claims (10, 11)
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12. A process for applying a differential thickness anti-reflection coating to a glazing to be used as an automotive windshield, comprising the steps of:
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A) immersing the glazing, comprising a rigid, transparent glazing material selected from the group consisting of glass, plastic, and multi-layered laminates thereof, into a coating medium, comprising a sol-gel solution including a metal-containing compound selected from the group consisting of silicon- and titantium-containing compounds; and B) simultaneously performing the steps of; i) withdrawing the glazing from the coating medium in a direction normal to the surface of the coating medium at a predetermined, optionally variable, rate from about 1 to about 75 centimeters per minute; and ii) pivoting the glazing about an axis orthogonal to the direction of withdrawal at a predetermined, optionally variable, angular velocity from about 1 to about 75 centimeters per minute selected to effect a differential coating of the coating medium on the substrate.
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Specification