Patent GB-590167-A (GB)
Title: Improvements in or relating to moulded products with reinforcement of filamentary material
IPC: C08L61/10
Filed: 1944-01-10
Abstract: A shock-resistant moulded product having a reinforcement of randomly arranged portions of textile material comprising regenerated cellulose filaments of tenacity at least 3 grams per denier.  The material may be in the form of fabric torn into pieces of from 1/4 -\ba1/2 inch square, the fabric being either woven, knitted or netted of high tenacity regenerated cellulose with or without other yarns present, e.g. cotton, linen or artificial silk, or it may be in the form of filaments, e.g. unspun fibres, yarns or cords coated with the moulding plastic. The regenerated cellulose filamentary materials are obtained by the saponification of high-tenacity cellulose acetate or by spinning unstable cellulose derivatives into regenerating baths, whilst the materials are stretched.  The cut fabric may be mixed into a composition containing the partly condensed synthetic resin together with a catalyst and a mould lubricant, and is then subjected to compression moulding.  The fabric may, however, first be coated with the composition and after evaporation of the solvent cut into pieces and moulded.  The coating impregnation is carried out in a bath followed by mangling; or by spreading or skim coating in a calender.  In an example, the reinforcement is plain woven fabric made from regenerated cellulose of dry tenacity 6 grams per denier and of warp 42 ends and weft 35 picks per inch. A partly condensed synthetic resin formed by adding 250 parts paraldehyde to 500 parts phenol containing hydrochloric acid as catalyst and heating, is dissolved in alcohol with hexamethylene tetramine and aluminium stearate and padded on to the fabric which after drying is cut up and moulded at 170 DEG  C.  The paraldehyde may be replaced by formaldehyde.  Fillers for the plastic include wood flour or other cellulose filler or a mineral filler, e.g. asbestos.  White or coloured pigments may also be included.  The mouldings are preferably made from thermosetting synthetic resins which are condensation polymers, but heat hardening addition polymers may also be used, e.g. diallyl phthalate, diallyl ketone and allyl methacrylate. Thermoplastic substances may also be used, e.g. polymerized vinyl compounds, polyvinylidene compounds, polymerized acrylic acid derivatives and polymerized mono-olefines as well as copolymers of these unsaturated compounds.  Cellulose derivatives, materials having a proteinaceous basis, e.g. casein and soya bean protein, and condensation polymers of aliphatic diamines with aliphatic dicarboxylic acids may be used.  The products include radio cabinets, clockcases, wheels, pulleys, shuttles and loom components, golf-club heads, rifle butts and protective helmets. Specifications 545,628 and 590,205 are referred to.ALSO:A shock resistant moulded product having a re-inforcement of randomly arranged portions of textile material comprising regenerated cellulose filaments of tenacity at least 3 grams per denier.  The material may be in the form of fabric torn into pieces of from 1/4 -\ba1/2 inch square, the fabric being either woven, knitted or netted of high tenacity regenerated cellulose with or without other yarns present, e.g., cotton linen or artificial silk, or it may be in the form of filaments, e.g., unspun fibres, yarns or cords coated with the moulding plastic. The regenerated cellulose filamentary materials are obtained by the saponification of high tenacity cellulose acetate or by spinning unstable cellulose derivatives into regenerating baths, whilst the materials are stretched.  The cut fabric may be mixed into a composition containing the partly condensed synthetic resin together with a catalyst and a mould lubricant, and is then subjected to compression moulding.  The fabric may, however, first be coated with the composition and after evaporation of the solvent cut into pieces and moulded.  The coating impregnation is carried out in a bath followed by mangling; or by spreading or skim coating in a calender.  In an example, the reinforcement is plain woven fabric made from regenerated cellulose of dry tenacity 6 grams per denier and of warps 42 ends and weft 35 picks per inch.  A partly condensed synthetic resin formed by adding 250 parts paraldehyde to 500 parts phenol containing hydrochloric acid as catalyst and heating, is dissolved in alcohol with hexamethylene tetramine and aluminium stearate and padded on to the fabric which after drying is cut and moulded at 170 DEG C.  The paraldehyde may be replaced by formaldehyde.  Fillers for the plastic include wood flour or other cellulose filler or a mineral filler, e.g., asbestos.  White or colour pigments may also be included.  The mouldings are preferably made from thermo-setting synthetic resins which are condensation polymers but heat hardening addition polymers may also be used, e.g., diallyl phthalate, diallyl ketone and allyl methacrylate.  Thermoplastic substances may also be used, e.g., polymerized vinyl compounds, polyvinylidene compounds, polymerized acrylic acid derivatives and polymerized mono olefines as well as copolymers of these unsaturated compounds.  Cellulose derivatives, materials having proteinaceous basic, e.g., casein and soya bean protein, and condensation polymers of aliphatic diamines with aliphatic dicarboxylic acids may be used.  The products include radio cabinets, clockcases, wheels, pulleys, shuttles and loom components, golf club heads, rifle butts and protective helmets. Specifications 545,628 and 509,205, [both in Group IV], are referred to.