Patent GB-700538-A (GB)
Title: Improvements in or relating to packaging materials
IPC: C08J7/052
Filed: 1951-10-03
Abstract: A coating composition for regenerated cellulose comprises drying oil fatty acid esters of a polymeric polyhydric alcohol, which alcohol is preparable by reacting a polyhydric phenol with a polyhaloalcohol, an epihalohydrin, or a polyepoxy compound, and a wax.  Polyhydric phenols may be resorcinol, hydroquinone, catechol, phloroglucinol, bis-phenol (p, p1 - dihydroxy - diphenyl - dimethyl - methane), p, p1 - dihydroxy - benzophenone, hematoxylin, or polyhydric anthracene; epihalohydrins may be epichlorhydrin, epibromhydrin, epihalohydrins of mannitol, sorbitol, and erythritol, glycerol dichlorhydrin, or b - methyl glycerol dichlorhydrin; and polyepoxy compounds may be bis-(2, 3-epoxypropyl) ether, butylee dioxide, and di-epoxides of mannitol and sorbitol, as disclosed in U.S.A.  Specification 2,456,408.  Drying oils may be linseed, soya or tung oils.  In an example (1) linseed oil is heated to 475 DEG C. with agitation and epichlorhydrin - bis - phenol resin having a m.pt. 95 DEG C. and an equivalent weight of 174 is added slowly, agitation is continued until a clear pill is obtained with acid number 15 \sB 1.  Tung oil is then added and the temperature raised to 475 DEG C. until the acid number is 20, and glycerol is added with the temperature 470 DEG C. until the acid number is 10. The mixture is thinned with xylene and metallic driers, e.g. cobalt and/or calcium naphthenates, are added. The mixture is heated to 60 DEG  - 90 DEG C. with stirring and 5 - 10 per cent. paraffin wax of m.pt. 125 DEG  - 140 DEG C. and 1 per cent. organic peroxide curing accelerator, e.g. mono-tertiary butyl hydroperoxide, or di-tertiary butyl or cumene peroxides are added and the mixture heated for 10 - 60 mins. at 60 DEG  - 80 DEG C.  The resulting mixture is applied hot and dried at 80 DEG  - 100 DEG C. until non-tacky.  In example (2) linseed oil is used alone.ALSO:A moisture-proof wrapping material for meat products, such as meat loaf, hams, salami, bologna, or weiners (see Group VIII) consists of regenerated cellulose sheet or tube coated with a contiuous film of a mixture comprising drying oil fatty acid esters of a polymeric polyhydric alcohol, which alcohol is preparable by reacting a polyhydric phenol with a polyhaloalcohol, an epihalohydrin, or a polyepoxy compound, and a wax, e.g. paraffin wax, and the sheet or tube is then heated to bond the mixture to the surface.  Polyhydric phenols may be resorcinol, hydroquinone, catechol, phloroglucinol, bis-phenol, p, p1-dihydroxybenzophenone, hematoxylin, or polyhydric anthracene; epihalohydrins may be epichlorhydrin, epibromhydrin, epihalohydrins of mannitol, sorbitol, and erythritol, glycerol dichlorhydrin, or b -methyl glycerol dichlorhydrin, and polyepoxy compounds may be bis-(2, 3-epoxypropyl) ether, butylene dioxide, and di-epoxides of mannitol and sorbitol as disclosed in U.S.A. Specification 2,456,408.  Drying oils may be linseed, soya, or tung oil.  The coated film may be overcoated with heat-sealing lacquers, light barrier components, or lacquers containing additional moisture-proofing waxes.