Patent GB-598055-A (GB)
Title: Plastic compositions
IPC: C08L7/00
Filed: 1944-07-19
Abstract: A composition of matter comprises 10 to 80 per cent by weight of a polyvinyl ester resin, 10 to 65 per cent of a wax from the group consisting of paraffin, candelilla, beeswax and carnauba, and either natural rubber or a copolymer of a major proportion of isobutylene and a minor proportion of isoprene in an amount less than that of either of the other essential constituents, and p  within the range 2 to 25 per cent, the proportions being such that the components are compatible.  The preferred resin is a polyvinyl acetate resin having a viscosity of 1 to 25 centipoises though polyvinyl butyrate, propionate, or caproate or mixtures of these resins may be used. Additional agents include up to 25 per cent of a plasticiser such as dibutyl phthalate, butyl phthalyl butyl glycollate, triethylene glycol di - 2 - ethyl - hexoate, and medicinal paraffin oil, from 6 to 37 per cent of precipitated chalk, up to 1.0 per cent of iron oxide, up to 15 per cent of conditioning agents such as glycerine and propylene glycol, and also stearic acid, pigments and dyes.  Many examples are given of chewing gum mixes, typical of which is polyvinyl acetate 55 parts by weight, No. 1 pale crepe rubber 6, liquid paraffin 2.5, dibutyl phthalate 12, paraffin wax 27, precipitated chalk 18.5.ALSO:A composition of matter suitable for a chewing gum base and for coatings and films comprises 10 to 80 per cent. by weight of a polyvinyl ester resin, 10 to 65 per cent. of a wax from the group consisting of paraffin, candelilla, beeswax and carnauba, and either natural rubber or a copolymer of a major proportion of isobutylene and a minor proportion of isoprene in an amount less than that of either of the other essential constituents, and within the range 2 to 25 per cent., the proportions being such that the components are compatible.  The preferred resin is a polyvinyl acetate resin having a viscosity of 1 to 25 centipoises through polyvinyl butyrate, propionate or caproate or mixtures of these resins may be used.  Additional agents include up to 25 per cent. of a plasticiser such as dibutyl, phthalate, butyl phthalyl butyl glycollate, triethylene glycol di-2-ethyl-hexoate, and medicinal paraffin oil, from 6 to 37 per cent. of precipitated chalk, up to 1.0 per cent. of iron oxide, up to 15 per cent. of conditioning agents such as glycerine and propylene glycol and also stearic acid, pigments and dyes.  Many examples are given of chewing gum mixes, typical of which is polyvinyl acetate 55 parts by weight, No. 1 pale crepe rubber 6, liquid paraffin 2.5, dibutyl phthalate 12, paraffin wax 27, precipitated chalk 18.5.ALSO:A chewing gum base consists of the composition which comprises 10-80 per cent by weight of a polyvinyl ester resin, 10-65 per cent of a wax from the group consisting of paraffin, candelilla, beeswax and carnauba, and either natural rubber or a copolymer of a major proportion of isobutylene and a minor proportion of isoprene in an amount less than that of either of the other essential constituents and within the range of 2 to 25 per cent, which composition is described in Group V.