Swedlow, Inc.

William F Fischer

William C Harbison

Charles A Bailey, Ii

Donald P LeMasters

An impact resistant transparent laminate that includes as one ply a special urethane-modified acrylic sheet containing a vinyl-functional polyurethane elastomer that is a polymerization product of an aliphatic diisocyanate, one or more hydroxyl-functional polyether or polyester prepolymers, and a hydroxyl or amine-functional vinyl monomer. In a three-ply embodiment of the invention, the urethane modified acrylic sheet serves as the back ply, a hard plastic sheet formed of a material like cast acrylic serves as the front ply, and a thin sheet having high elongation such as polyurethane serves as an intermediate ply. In a five-ply embodiment of the invention, the laminate further includes a second thin sheet having high elongation disposed immediately behind the urethane-modified acrylic ply and a ductile plastic sheet formed of a material like polycarbonate to serve as its back ply.

Impact resistant laminate

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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Orange, CA, United States of America

William F Fischer