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    • 43. 发明授权
    • Chemical embossing
    • 化学爆破
    • US3804933A
    • 1974-04-16
    • US22374472
    • 1972-02-04
    • GAF CORP
    • ALLAN JFIELD N
    • B44C1/20C08F259/04C08J9/10D06N3/00D06N3/06D06N7/00B29H7/20
    • C08F259/04B44C1/205C08J9/10D06N3/005D06N3/06D06N7/0013Y10S264/82
    • AN IMPROVED PROCESS FOR THE CHEMICAL EMBOSSING OF A THERMOPLASTIC SHEET COMPRISING BLENDING: (1) A VINYL RESIN, E.G. POLYVINYL CHLORIDE, (2) A PLASTICIZER FOR THE VINYL RESIN, (3) A BLOWING AGENT WHICH DECOMPOSES WHEN HEATED AT A TEMPERATURE IN THE RANGE ABOVE THE GLASS TRANSITION TEMPERATURE OF THE PLASTICIZED VINYL RESIN AND BELOW THE DECOMPOSITION TEMPERATURE OF THE RESIN, (4) A MONOMER CONTAINING AT LEAST TWO OLEFINICALLY UNSATURATED SITES AND CAPABLE OF POLYMERIZATION AT ELEVATED TEMPERATURES IN THE PRESENCE OF AN ADDITION POLYMERIZATION CATALYST; AND (5) A MONOMER CONTAINING ONE OLEFINICALLY UNSATURATED SITE AND CAPABLE OF POLYMERIZATION AT ELEVATED TEMPERATURES IN THE PRESENCE OF AN ADDITION POLYMERIZATION CATALYST. SUCH A BLENDED COMPOSITION IS FORMED INTO A SHEET AND TO SUCH SHEET IS APPLIED, IN A PRE-DETERMINED PATTERN, A COMPOSITION COMPRISING (A) A CATALYST THAT WILL CAUSE POLYMERIZATION OF THE MONOMERS AND, OPTIONALLY, (B) A LIQUID THAT WILL PENETRATE THE SHEET. THE FOAMING OF THE SHEET AND CREATION OF THE EMBOSSED EFFECT IS ACCOMPLISHED BY HEATING THE RESULTING SHEET TO A TEMPERATURE SUFFICIENT TO FUSE THE PLASTICIZED RESIN, POLUMERIZE THE MONOMER AND DECOMPOSE THE BLOWING AGENT. THE UTILIZATION OF THE MONOMER CONTAINING ONE OLEFINICALLY UNSATURATED SITE ALLOWS FOR THE PRODUCTION OF AN EMBOSSED EFFECT THROUGH THE UTILIZATION OF LESS OF THE EXPENSIVE MONOMER CONTAINING AT LEAST TWO OLEFINICALLY UNSATURATED SITES.