Verfahren zur Herstellung eines Zurichtblattes und flächenförmiges Material für die Durchführung desselben

• Main Authors: B. GERGEN,JAMES, G. WARTMAN,THOMAS
• Format: Patent
• Language: German
• Published: 15.12.1960
• Subjects: COLOUR PRINTING; LINING MACHINES; PERFORMING OPERATIONS; PRINTING; PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; STAMPS; TRANSPORTING; TYPEWRITERS

In Example (1) a composition is described which comprises 1,200 parts by weight of a vinyl chloride-vinyl acetate copolymer, 480 parts of plasticizer, 624 parts of amyl acetate, 680 parts of volatile petroleum naphtha and 30 parts of puffing agent. The vinyl chloride-vinyl acetate copolymer contained 90 parts of vinyl chloride to 10 parts of vinyl acetate. The plasticizer was a polymeric polyester type, and the puffing agent was p, p1-oxy bis (benzene sulphonyl hydrazide). The ingredients, except the puffing agent, were added to a jar half filled with porcelain balls of about 1/2 inch diameter and the jar was rolled for about 16 hours after which the puffing agent was added and the jar rolled for a further 2 1/2 hours. Example (3) describes a composition comprising a vinyl chloride-vinyl acetate copolymer, a condensation product of epichlorhydrin and bisphenol A, adipyl dihydrazide (curing agent for the epoxy resin) amyl acetate, petroleum naphtha and a puffing agent. Example (4) describes a composition comprising a vinyl chloride-vinyl acetate copolymer, an epoxy resin as in (3), 2, 4-toluene disulphonamide (epoxy curing agent) N-(3-diethylaminopropyl) phthalimide salicylate (activator for epoxy curing agent), amyl acetate, naphtha and puffing agent (p-diphenyl diazanium fluoborate, which functions additionally as a curing agent for the epoxy resin). The compositions may also contain carbon black, aluminium powder, silica and bentonite. The compositions are formed into sheets and p exposed to radiant energy to cause expansion and, when an epoxy resin is present, curing.ALSO:In Example (1) a composition comprises 1200 parts by weight of a vinyl chloride-vinyl acetate copolymer, 480 parts of plasticiser, 624 parts of amyl acetate, 680 parts of volatile petroleum naphtha and 30 parts of puffing agent. The vinyl chloride-vinyl acetate copolymer contained 90 parts of vinyl chloride to 10 parts of vinyl acetate. The plasticiser was a polymeric polyester type, and the puffing agent was p, p1-oxy bis benzene sulphonyl hydrozide. The ingredients, except the puffing agent were added to a jar half filled with porcelain balls and the jar was rolled for about 16 hours after which the puffing agent was added and the jar rolled for a further 2 1/2 hours. The compositions (see Group IV(a)) are described. The compositions may also contain carbon black, aluminium powder, silica and bentonite. The compositions are formed into sheets and exposed to radiant energy to cause expansion.