| 摘要 |
1,150,829. Photo-polymerizable materials. E.I. DU PONT DE NEMOURS & CO. July 6, 1967 [July 7, 1966], No. 31268/67. Heading G2C. A copying material comprises a support carrying a photo-polymerizable layer comprising 0À2-12 parts of an inorganic thixotropic binder of 5-500 milli-microns average particle size as the sole binder, and 1-30 parts of a non-gaseous ethylenically unsaturated compound containing at least one terminal ethylenic group capable of forming a high polymer by free radical initiated, chain propagated addition polymerization. The material is imagewise exposed to actinic radiation and contacted with an image-receiving support, a high shear or pressure (as defined below) is applied to the elements to cause the unexposed parts of the layer to transfer, and the sheets are separated. The term "high shear or pressure" means a pressure exerted at room temperature which causes the unexposed binder to become sufficiently liquid to transfer and adhere to the receiving sheet. The binder may be boehmite alumina, clay mixtures of thixotropic silicate oxides, e.g. bentonite, and divided gels containing 99À5% SiO 2 with 0À5% mixed metallic oxides, and mixtures thereof. Exemplified unsaturated compounds are polyxoyethylated trimethylol propane triacrylate of Specification 1,055,198 and polyethylene glycol diacrylate. The layer may also contain the usual polymerization initiators, dyes, pigments, pigment dispersants and 0À2-0À25 parts of a thermoplastic polymer. A cover sheet may be laminated over the layer during storage and optionally during the exposure if transparent and then removed for the transfer operation. The usual supports and receiving supports are listed and conventional polymeric sheets are listed for use as cover sheets. |
