Re-polymerisation stabiliser

文件类型：PDF文档
文件大小：420K
A process for producing a monomer comprising thermally cracking a pre-polymer, such as a cyanoacrylate compound, typically a methyl, ethyl, n-propyl, iso propyl, n-butyl, iso butyl, n-pentyl, 3-pentyl, n-hexyl, 2-hexyl, 3-hexyl, n-heptyl, 3-heptyl, 4-heptyl, n-octyl, 2-octyl, 3-octyl, methoxy ethyl, ethoxy ethyl, propoxy propyl, cyclobutyl, cycloheptyl, cyclohexyl, cyclooctyl, cyclopentyl or allyl cyanoacrylate in the presence of a stabiliser, such as a sterically hindered polyphenolic compound, typically 1, 3, 5-trimethyl-2, 4, 6-tris (3, 5-di-tert-butyl-4-hydroxybenzyl)benzene, typically Anox 330 (RTM) or Irganox 1330 (RTM), a hexaphenol, such as 1, 1-bis(2-methyl-4-tert-butylphenyl)butane, typically Lowinox 44B25 (RTM), 1, 1, 3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, typically Lowinox CA 22, a radical stabiliser, such as quinone, hydroquinone, p-tert-butyl catechol, p-methoxy phenol, 2, 6-di-tert-butyl-p-cresol, 2, 2-methylene-bis-(4-methyl-6-tert-butyl)phenol, an anionic stabiliser, such as methane sulphonic acid, p-toluene sulphonic acid, trifluoromethane sulphonic acid, hydroxypropane sulphonic acid, trifluoromethane sulphonic acid, hydroxyl propane sulphonic acid, sulphur dioxide, hydrofluoric acid, to form a monomer as a distillate, the stabiliser preventing the re-polymerisation of the monomer during cracking while not being carried over in the distillate in normally detectable amounts. The pre-polymer is made from a reaction of a cyanoacetate, paraformaldehyde and piperidine.