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Title: Transparent, optically clear poly(lactone-urethane) interlayers for laminated safety glass

Abstract: Energy-absorbing interlayers and glass laminates prepared therefrom for use as automobile windshields and other safety glass applications are disclosed. The interlayers are made from a poly(lactone-urethane) in which the molecular weight and structure of the lactone moiety is carefully controlled so as to get optimum energy-absorbing and optical properties.


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Inventors: Chang, Wen-Hsuan (Gibsonia, PA, US)
Ammons, Vernon G. (Glenshaw, PA, US)

Application Number: 728372
Filing Date: 1976-09-30
Publication_date: 1978-04-18
Assignee: PPG Industries, Inc. (Pittsburgh, PA)
Primary Class(es): 528/80 428/425.6, 525/418, 528/76, 528/77, 528/81, 528/83
Other Classes:
US Patent Ref:
B474645Mar, 1976Chang201/775.
3186971Jun, 1965Hostettler et al.260/77.
3931113Jan, 1976Seeger et al.260/77.

Other Refs:
Primary Examiner: Cockeram, H.S.
Assistant Examiner:
Attorney: Uhl; William J.