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Moisture resistant coatings for polymeric enclosures

一种聚合物、耐湿性的技术，应用在照明装置的零部件、照明装置、信号装置等方向，能够解决灯性能影响等问题

Inactive Publication Date: 2012-03-28
GORE ENTERPRISE HLDG INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The location of these vent systems can negatively affect other aspects of lamp performance

Method used

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  • Moisture resistant coatings for polymeric enclosures
  • Moisture resistant coatings for polymeric enclosures
  • Moisture resistant coatings for polymeric enclosures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The inner surface of the polycarbonate test panel was roughened and dip-coated on both sides with a PVDC copolymer emulsion (Serfene TM 2022, Rohm & Haas Company). The calculated moisture permeability coefficient of PUDC copolymer is about 7.80E - 12 (cm2 / s-Pa). The moisture permeability coefficient of polycarbonate substrate is 1.05E - 10 (cm2 / s-Pa). The panels were allowed to dry at room temperature to form a moisture barrier. The thickness of this layer is 5-30 mils. Then connect the test board to the light-emitting package for the desiccant lifetime test. image 3 This moisture barrier was shown to increase desiccant lifetime by a factor of 2.1.

Embodiment 2

[0055] The inside surfaces of the polycarbonate test panels were coated with the barrier material Parylene C (Specialty Coating Systems Inc) by vapor deposition. The moisture permeability coefficient of Parylene C is 5.2080E - 12 (cm2 / s-Pa). The thickness of the barrier layer is about 25 microns. Connect the test board to the light-emitting package to perform the desiccant lifetime test. image 3 This moisture barrier was shown to increase desiccant lifetime by a factor of 1.6.

Embodiment 3

[0057] Using a double-sided silicone adhesive, apply 4 mil thick Aclar (Honeywell International Inc) film was bonded to the inside surface of a polycarbonate test panel. Aclar The moisture permeability coefficient of Wei 1.6E - 13 (cm2 / s-Pa). Connect the test board to the light-emitting package to perform the desiccant lifetime test. image 3 This moisture barrier was shown to increase desiccant lifetime by a factor of 2.2.

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Abstract

A moisture resistant housing assembly is provided, the housing defining an internal space and an ambient space surrounding said internal space, the housing constructed at least partially of a polymeric material and a moisture barrier layer covering a portion of the polymeric material, the moisture barrier layer having a moisture permeation coefficient that is lower than the moisture permeation coefficient of the polymeric material.

Description

Background of the invention [0001] Excessive moisture can cause damage within many electronic packages such as lighting assemblies or electronic control units. For example, electrical and electronic devices can be damaged by excessive moisture inside the package. Examples of lighting assemblies that are adversely affected by moisture include, for example, automotive headlight units and other outdoor lighting assemblies where on / off cycling of the lamp within the enclosure results in moisture accumulation. As used herein, the term "humidity" is intended to mean water, whether in liquid or vapor form, that diffuses or condenses from the ambient atmosphere. [0002] The problem of moisture accumulation within the package is particularly acute in packages with polymer components. For example, modern automobile headlights, brake lights, running lights, turn signals, fog lights, reverse lights, and parking lights (collectively referred to as "lights" or "auto lights") often have o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21V31/03
CPCF21S48/335F21S41/28F21S45/33F21S45/50F21V5/04F21V31/00
Inventor C·S·米哈韦克D·德圭塞皮
Owner GORE ENTERPRISE HLDG INC
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