Plastic transparencies having improved resistance to cracking

Details Plastic transparencies having improved resistance to cracking Plastic transparencies having improved resistance to cracking

1980-12-29

1983-03-22

Epstein, Henry F.

Stock material or miscellaneous articles

Structurally defined web or sheet

Edge feature

264291, 427164, 428520, B32B 2302

Patent

active

043776116

ABSTRACT:
A plastic transparency for particular use as an airplane window, including a transparent sheet member and a thin resinous coating overlying the peripheral edge surface of the sheet member. The sheet member is formed of a multi-axially oriented plastic material that is absorptive of moisture, the volume of the member varying in accordance with the amount of moisture absorbed. The edge coating has a moisture permeation rate substantially less than that of the underlying sheet member, so when the window is exposed to an environment of high or variable humidity, any moisture gradient adjacent the peripheral edge surface is reduced, and the resultant tensile stress and incidence of cracking in the window are correspondingly reduced.

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