Crack propagation resistant acrylic sheet

Details Crack propagation resistant acrylic sheet Crack propagation resistant acrylic sheet

1983-11-14

1985-03-19

Cannon, James C.

Stock material or miscellaneous articles

Structurally defined web or sheet

Physical dimension specified

49171, 109 495, 109 585, 264216, 273410, 428522, 428911, 525228, 5263285, 5263297, E06B 510, F41H 526

Patent

active

045059721

ABSTRACT:
Improved crack propagation resistant acrylic sheets are provided: These sheets are prepared by copolymerizing methyl methacrylate with minor amounts of lower alkyl (C.sub.2 -C.sub.4) 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.

REFERENCES:
patent: 3865619 (1975-02-01), Pennewiss et al.
patent: 4368235 (1983-01-01), Vaughn
Chemical Abstracts, 78:138011k, (1973).
Chemical Abstracts, 80:135067z, (1974).
Chemical Abstracts, 81:121265w, (1974).
Chemical Abstracts, 84:18343h, (1976).
Chemical Abstracts, 87:23886d, (1977).
Chemical Abstracts, 93:74004w, (1980).
Chemical Abstracts, 94:165703k, (1981).
Chemical Abstracts, 97:73205h, 145365k, (1982).

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