# US 8,465,186 B2 · Moisture resistant coatings for polymeric enclosures

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- Number: US 8,465,186 B2
- Document ID: US8465186B2
- Status: Granted
- Kind: B2
- Application number: 12/403,696
- Filed: 2009-03-13
- Published: 2010-09-16
- Granted: 2013-06-18
- Earliest claimed: 2009-03-13
- Assignees: Gore Enterprise Holdings, Inc.
- Applicants: Chris S. Michalak; Dave DeGuiseppi
- Inventors: Chris S. Michalak; Dave DeGuiseppi
- Web page: https://patentgrep.com/patent/US8465186B2

## CPC

- F21S 45/33: specially adapted for headlamps
- F21S 41/28: {Cover glass}
- F21S 45/50: Waterproofing
- F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS

## 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.

## Claims

### Claim 1

A lighting assembly comprising:
a) a lamp housing defining an internal space and an ambient space surrounding said internal space, said lamp housing comprises at least one polymeric lens and a polymeric case, the lens having a first moisture permeation coefficient;
b) light source positioned within said internal space;
c) desiccant disposed within the internal space;
d) diffusion tube having a first opening proximate to the internal space and a second opening proximate to the ambient space, said diffusion tube providing fluid communication between the internal space and the ambient space; and
e) moisture barrier layer disposed upon said lens, the moisture barrier having a second moisture barrier coefficient, wherein the second moisture barrier coefficient is less than the first moisture barrier coefficient.

### Claim 2 (depends on 1)

The lighting system of claim 1 in which said moisture barrier layer is a coating.

### Claim 3 (depends on 1)

The lighting system of claim 1 in which said moisture barrier layer is a film.

### Claim 4 (depends on 1)

The lighting system of claim 1 in which said moisture barrier layer is optically clear.

### Claim 5 (depends on 1)

The lighting system of claim 1 in which, said desiccant is a high capacity desiccant disposed within the internal space, said desiccant being nonregenerating at temperatures up to about 50C and about 11% RH.

### Claim 6

A lighting assembly comprising:
a) a lamp housing defining an internal space and an ambient space surrounding said internal space, said lamp housing comprising at least one polymeric lens and a polymeric case, the lens having a first moisture permeation coefficient;
b) light source positioned within said internal space; and
c) moisture barrier layer disposed upon at least the polymeric lens of said lamp housing, the moisture barrier having a second moisture permeation coefficient, wherein the second moisture permeation coefficient is less than the first moisture permeation coefficient.

### Claim 7 (depends on 6)

The lighting assembly of claim 6, wherein said polymeric lens comprises polycarbonate.

### Claim 8 (depends on 6)

The lighting assembly of claim 6, wherein said moisture barrier layer is in the form of a coating or a film disposed on said lens.

### Claim 9 (depends on 6)

The lighting assembly of claim 6, wherein said moisture barrier layer is adjacent to said polymeric lens.

### Claim 10 (depends on 6)

The lighting assembly of claim 6, wherein said moisture barrier layer comprises Aluminum dioxide.

### Claim 11 (depends on 6)

The lighting assembly of claim 6, wherein said moisture barrier layer comprises PVDC.

### Claim 12

A lens for use in a housing that defines an internal space, the lens comprising a polymeric lens material and a moisture barrier layer covering the lens, the moisture barrier layer being in the form of a coating or a film disposed on the lens, and the lens material having a first moisture vapor permeation coefficient that is greater than a second moisture vapor permeation coefficient of the moisture barrier layer.

### Claim 13 (depends on 12)

The lens of claim 12 in which the moisture barrier layer comprises Aluminum Oxide.

### Claim 14 (depends on 12)

The lens of claim 12 in which the moisture barrier layer comprises PVDC.

### Claim 15 (depends on 6)

The lighting assembly of claim 6, wherein said second moister permeation coefficient is less than the first moisture permeable coefficient by at least a factor of 1.5.

### Claim 16 (depends on 12)

The lens of claim 12, wherein said second moister permeation coefficient is less than the first moisture permeable coefficient by at least a factor of 1.5.