Crack propagation resistant acrylic sheet

Details Crack propagation resistant acrylic sheet Crack propagation resistant acrylic sheet

C - Chemistry, Metallurgy

08

F

402/513, 400/657

C08F 220/14 (2006.01) B32B 17/10 (2006.01)

Patent

CA 1223699

- i - PATENT APPLICATION of THOMAS STEVEN MOORE and DELMAS BRYSON PENNINGTON for IMPROVED CRACK PROPAGATION RESISTANT ACRYLIC SHEET DN 83-17A MSA:plb ABSTRACT OF THE INVENTION Improved crack propagation resistant acrylic sheets are provided: These sheets are prepared by copolymerizing methyl methacrylate with minor amounts of lower alkyl (C2-C4) methacrylates. One and one quarter inch thick sheets polymerized from a monomer mixture of about 88 weight percent methyl methacrylate and about 12 weight percent butyl methacrylate or from about 76 weight percent methyl methacrylate and about 24 weight percent ethyl methacrylate are useful as indoor and outdoor ballistic glazing materials.

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