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Transparent acoustical and mechanical barrier

  • US 6,432,522 B1
  • Filed: 06/09/1999
  • Issued: 08/13/2002
  • Est. Priority Date: 02/20/1999
  • Status: Expired due to Fees
First Claim
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1. An optically transparent glass laminate, measuring about 3 to 5 mm in total thickness, and having an interlayer film, the interlayer film comprising at least two polymeric film layers:

  • a core film layer having a modulus of at least 25,000 psi (173 MPa), and a surface film layer having a maximum modulus of 15,000 (104 MPa) at 50 to 10,000 Hz and 20°

    C.; and

    the lass laminate having an acoustical barrier insulating capacity at least equivalent to that of a 3.85 mm thick monolithic pane of glass, an Articulation Index value of at least 64.2% at 50 to 10,000 Hz, a sharpness value of less than 150 at 50 to 10,000 Hz, a penetration resistance of at least 9 meters in test method ECE R43 A6 4.2, and a maximum haze of 4%.

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