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Precision coating of viscous liquids and use in forming laminates

A liquid, liquid source technology, applied in the field of precision coating of viscous liquids and in the formation of laminates, can solve the problems of no complete coplanarity, LOCA overflow, etc.

Active Publication Date: 2015-07-29
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This involves an additional process step and can still result in flooding of the LOCA if a sufficiently precise amount is not dispensed and / or there is no perfect coplanarity between the two substrates where the LOCA is bonded

Method used

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  • Precision coating of viscous liquids and use in forming laminates
  • Precision coating of viscous liquids and use in forming laminates
  • Precision coating of viscous liquids and use in forming laminates

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0210] An alternative device was also built, which roughly resembles the figure 1 The apparatus shown in and discussed above differ in that the support for the substrate is cylindrical and undergoes rotational motion to create relative motion between the coating head and the substrate. More specifically, the support was a 32.4 cm diameter aluminum cylinder whose rotational motion was controlled by a motor (commercially available from Kollmorgen as model FH5732) via air bearings (commercially available as BLOCK-HEAD 10R Commercially available from Professional Instruments of Hopkins, MN) was attached to the cartridge.

[0211] Rinse the cartridge with isopropanol and allow to dry. Several sheets of flexible glass 0.1 mm thick by 300 mm long by 150 mm wide (commercially available as OA10G from Nippon Electric Glass America, Inc of Schaumburg, IL) were attached to the barrel. Pseudoplastic and thixotropic optically clear liquid adhesives were prepared commercially as 1033 STEN...

example 2

[0219] The setup for this example is roughly similar to Example 1, except for the programming provided for the controller. Table 2 summarizes the example.

[0220] Table 2

[0221]

[0222]

[0223] *This period is provided to space one patch from the adjacent patch around the barrel.

example 3

[0225] Carefully remove the sample prepared according to Example 1 from the cylinder and place it on a granite table. Sheets of similarly sized EAGLE XG display glass (commercially available from Corning, of Corning NY) were manually laminated using a motion perpendicular to the granite surface and at standard atmospheric pressure. The display glass is slightly bent during lamination to reduce the resulting air pockets of entrapped gas during lamination. The resulting samples showed pockets of gas entrapment, but lamination in a vacuum or lamination of the display glass by robotic manipulation is expected to yield better results.

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Abstract

A process including providing a coating head having an external opening in flow communication with a source of a first coating liquid, positioning the coating head relative to a substrate to define a gap between the external opening and the substrate, creating relative motion between the coating head and the substrate in a coating direction, and dispensing a predetermined quantity of the first coating liquid from the external opening onto at least a portion of at least one major surface of the substrate to form a discrete patch of the first coating liquid in a predetermined position on at least a portion of the major surface of the substrate. The first coating liquid as dispensed exhibits a viscosity of at least 1 Pascal-sec. In some exemplary embodiments, the first coating liquid is a liquid optically clear adhesive composition used in a laminate including a light emitting or reflecting device component.

Description

[0001] Cross References to Related Applications [0002] This patent application claims the benefit of US Provisional Application No. 61 / 734,221 filed December 6, 2012, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present disclosure relates generally to the application of coatings to substrates, and more particularly to the precise application of non-self-leveling viscous liquid adhesives to substrates, and the formation of laminates from such coated substrates. Background technique [0004] Optically clear liquid adhesives (LOCAs) are increasingly used in the display industry to fill gaps between optical components. For example, LOCA can fill the air gap between the cover glass and an indium tin oxide (ITO) touch sensor, between the ITO touch sensor and the liquid crystal module, or directly between the cover glass and the liquid crystal module. Recently, several coating processes have been developed for more pr...

Claims

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Application Information

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IPC IPC(8): B05D1/26B05D7/24
CPCC09D7/00B29D11/0073C09J5/00G02F2202/28C03C17/00G02F1/1303C03C17/002B05D1/02C09J133/10G02F1/13338
Inventor 乔纳森·J·奥黑尔卡尔·K·斯滕斯瓦德克里斯托夫·J·坎贝尔丹尼尔·H·卡尔森格伦·A·杰里
Owner 3M INNOVATIVE PROPERTIES CO