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    • 3. 发明授权
    • Process for the production of polymethacrylimide foam materials
    • 聚甲基丙烯酰胺泡沫材料生产工艺
    • US5928459A
    • 1999-07-27
    • US66776
    • 1998-04-27
    • Werner GeyerHermann SeibertSabine Servaty
    • Werner GeyerHermann SeibertSabine Servaty
    • C08J5/24B32B27/30C08F8/48C08F220/06C08F220/50C08J9/04C08J9/06C08J9/14C08K3/22C08K5/20C08L33/02C08L33/22C08J4/00B05D5/00C08J101/00C08J201/00
    • C08J9/142C08J9/06C08J2201/03C08J2333/24
    • 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 C.sub.3-8 -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 200-260.degree. C.; and thenheat treating the sheet in two steps, at a first step of 2-6 hours at 100-130.degree. C. and a second step of 32-64 hours at 180-220.degree. C.
    • 聚甲基丙烯酰胺泡沫体通过以下方法制备:包括:制备由(a)40-60重量份的单体混合物组成的混合物, %甲基丙烯腈,60-40重量% %甲基丙烯酸,以及任选地至多20wt。 %,基于甲基丙烯酸和甲基丙烯腈的总和,其它单官能的乙烯基不饱和单体,(b)0.5-8wt。 %的甲酰胺或单甲基甲酰胺和一价C 3-8脂族醇的推进剂混合物,(c)交联剂体系,其由(c.1)0.005-5wt。 %的可以自由基聚合的乙烯基不饱和化合物,在分子中具有至少两个双键,和(c.2)1-5wt。 溶解在单体混合物中的%氧化镁,以及至少一种自由基引发剂和任选的至少一种成形为片状的添加剂; 聚合片中的单体; 随后在200-260℃的温度下使聚合物片发泡。 然后在100-130℃的2-6小时的第一步骤和180-220℃的第二步32-64小时的两个步骤中进行两步热处理。