| 摘要 |
<p>1507347 Desensitizing colour developers FUJI PHOTO FILM CO Ltd 21 March 1975 [22 March 1974] 12022/75 Heading D2B [Also in Divisions B6 and C3] A colour-developer is desensitized by contacting it with a compound containing at least one SiOSi, SiCSi or SiSi linkage and at least one alkyleneoxy or alkyleneimino group in the molecule. The desensitizing agent may be mixed with one or more polymer, wax, vegetable oil, inorganic material. anti-offset agent. solvent, or other desensitizing agent, and preferably constitutes 1-60 wt. % of the composition. 22 specific compounds are listed as desensitizing agents: they contain 1-7 polyether chains of up to 20 -CH 2 CH 2 O- units and 0-6 -CH 2 CH(CH 3 )O- units, HO-. MeO- or BuO- terminated, attached to Si in a monosilane, disilane, disilmethylene or Si 2-9 polysiloxane molecule in which the other groups are -CH 3 , directly or via -C 2 H 4 -, -C 3 H 6 -, -CH 2 CH(OH)CH 2 -, -N(Me)-C 2 H 4 -NMe-C 2 H 4 - @ or -N-C 2 H 4 -N-C 3 H 6 - groups. In the Examples desentitizing compositions are prepared from a linseed oil-alkyd resin, TiO 2 and one of the specified agents in 1:3:1 weight ratio. These are printed onto colour-developer sheets, which are then pressed into contact with colourformer sheets, or are coated onto paper, which is then written on with a ball-pen or fountain pen. The colour-developer sheets are of paper coated with acid-treated clay, a phenyl-phenolformaldehyde resin, and/or a di-t-butylsalicylic acid/ZnCl 2 product, in aqueous methoxyethylene-maleic anhydride copolymer/styrenebutadiene latex or in aqueous polyvinyl alcohol. The colour-former sheets are of paper coated with encapsulated oil solutions of crystal violet lactone and benzoyl-leucomethylene blue or of these plus amino-fluoran dyes, suspended in gelatin and gum arabic solutions.</p> |
