GB714414A - Improvements in or relating to the production of thermoplastic compositions - Google Patents

Abstract

A thermoplastic composition suitable for the production of units for facing walls and floors comprises a filler and a two-phase binder therefor, in which binder one phase is continuous and comprises a fusible resin and the other phase is of ramiform structure and comprises unvulcanized rubber. The fusible resin, which preferably is plastic at a temperature between 100 and 120 DEG C., is exemplified by an ester gum, a xylenol-formaldehyde resin, a coumarone-indene resin, a coumarone-styrene resin, a naphthalene-formaldehyde resin, or a modified phenol-formaldehyde resin, e.g. a phenolformaldehyde resin modified with pentaerythritol. The rubber phase may comprise a synthetic rubber exemplified by a copolymer of butadiene with a minor amount of acrylonitrile, styrene or methyl methacrylate. A modification of the thermoplastic composition comprises a pulverulent filler, a fibrous filler, and a two-phase binder therefor, in which binder one phase is a fusible resin composition plastic at 100-120 DEG C. and the other phase is present in amount less than the fusible resin phase and comprises a copolymer of styrene with a minor amount of butadiene, e.g. such a copolymer in which the ratio of styrene to butadiene is 85:15. The fillers are exemplified by finely-divided limestone, asbestos fibre, and exfoliated vermiculite. There may also be incorporated: pigments, e.g. finely-divided red iron oxide, a plasticizer for the fusible resin, e.g. high-boiling aromatic petroleum fraction and wood rosin, and a plasticizer for the copolymer of styrene with a minor amount of butadiene, if present, e.g. high-boiling aromatic petroleum fraction with dioctyl phthalate.ALSO:A thermoplastic composition suitable for the production of units for facing walls and floors comprises a filler and a two-phase binder therefor, in which binder one phase is continuous and comprises a fusible resin and the other phase is of ramiform structure and comprises unvulcanized rubber. The fusible resin, which preferably is plastic at a temperature between 100 and 120 DEG C. is exemplified by an ester gum, a pentaerythritol-modified phenol-formaldehyde, a xylenol-formaldehyde, a coumarone-indene, a coumarone-styrene or naphthalene-formaldehyde resin. The rubber phase, preferably present in amount less than the fusible resin, comprises natural rubber, which may be incorporated as latex, and synthetic rubbers exemplified by copolymers of butadiene with minor amounts of acrylonitrile, styrene and methyl methacrylate. A modification of the thermoplastic composition comprises a pulverulent filler, a fibrous filler, and a two-phase binder therefor, in which binder one phase is a fusible resin composition plastic at 100-120 DEG C and the other phase is present in amount less than the fusible resin phase and comprises a copolymer of styrene with a minor amount of butadiene, e.g. a copolymer in which the ratio of styrene to butadiene is 85 : 15. The fillers are exemplified by finely-divided limestone, asbestos fibre, and exfoliated vermiculite. There may also be incorporated: pigments, e.g. finely divided red iron oxide, a plasticizer for the fusible resin, e.g. high-boiling aromatic petroleum fraction and wood rosin, and a plasticizer for the copolymer of styrene with a minor amount of butadiene, if present, e.g. a high-boiling aromatic petroleum fraction with dioctyl phthalate.