Process for the production of polymethacrylimide foam materials

Details Process for the production of polymethacrylimide foam materials Process for the production of polymethacrylimide foam materials

C - Chemistry, Metallurgy

08

J

C08J 9/14 (2006.01) B32B 5/18 (2006.01) C08J 9/06 (2006.01)

Patent

CA 2235293

Polymethacrylimide foams are prepared by a method, comprising: preparing a mixture consisting of (a) a monomer mixture of 40-60 wt.-% methacrylonitrile, 60-40 wt.-% methacrylic acid, and, optionally, up to 20 wt.%, based on the sum of methacrylic acid and methacrylonitrile, of other monofunctional, vinyl- unsaturated monomers, (b) 0.5-8 wt.% of a propellant mixture of formamide or monomethyl formamide and a univalent C3-8-aliphatic alcohol, (c) a cross-linking agent system, which consists of (c.1) 0.005-5 wt.% of a vinyl-unsaturated compound which can be radically polymerized, with at least two double bonds in the molecule, and (c.2) 1-5 wt.% magnesium oxide, dissolved in the monomer mixture, and at least one radical initiators and optionally at least one additive, shaped in the form of a sheet; polymerizing the monomers in the sheet; subsequently foaming the polymerizate sheet at temperatures from 200 to 260 °C; and then heat treating the sheet in two steps, at a first step of 2-6 hours at 100-130 °C and a second step of 32-64 hours at 180-220 °C.

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