Patent GB-1290616-A (GB)
IPC: B02C13/284
Filed: 1970-01-29
Abstract: 1290616 Impact pulverizers LUDWIG PALLMANN MASCHINENFABRIK UND MAHLWERK KG 29 Jan 1970 [4 Feb 1969 22 Feb 1969] 4226/70 Heading B2A An impact pulverizer comprises an impeller 2, Fig. 1, rotatable in a housing 1 and formed of two parallel plates 8, 9 and an impact track 5 arranged around the impeller and having a width equal to the axial distance between the plates. Sieves 18 are arrayed on each side of the impact track. Perforated partitions 19 may be arrayed adjacent the edges of the sieve remote from the impact track. Alternatively the sieves and impact track may be rotatable, Fig. 2, in the same or opposite direction to the impeller. The impact track may have a patterned or grooved surface to permit of different grades of milling. 1290707 Coating polymeric films BOSTIK Ltd 6 Nov 1969 [7 Nov 1968] 54383/69 Addition to 1236043 Heading B2E [Also in Division B5N] A surface of a body of synthetic polymeric material, the molecules of which have a least one hydrogen atom in a repeating unit of a carbon-carbon chain of the polymer molecule, is prepared to receive an adhesive or coating composition by applying photosensitizer material and organic isocyanate material to the surface and then irradiating the surface with ultra-violet radiation whilst photosensitizer material and organic isocyanate material are present on the surface. The polymers which may be treated are those having a critical surface tension of wetting of 35 dynes per centimetre or less as determined by contact angle measurements e.g. polyethylene, polypropylene, copolymers of ethylene and propylene alone or with a minor amount of a non-conjugated diene, e.g. hexadiene, and fluorine-containing polymer such as polyvinyl fluoride and polyvinylidene fluoride. The isocyanate may be triphenylmethane triisocyanate, polyarylene polyisocyanate, tolylene diisocyanate, methylene bis 4 phenyl isocyanate, phenyl isocyanate applied in organic solvent solution. The photosensitizers may be halogenated hydrocarbons, e.g. methylene chloride, trichloroethylene, chloroform, ketones, e.g. benzophenone, acetophenone, benzoin, 2-acetonaphthone, acenaphthene and fluorene. It is stated that the photosensitizers interact with the resin substrate producing groups which will react with isocyanate groups. The isocyanate and photosensitizer may be applied separately, or together, e.g. in solution in a common solvent or as a solution of the isocyanate in the photosensitizer. The isocyanate and photosensitizer may be included in the adhesive composition or a photosensitizer material may be admixed with an adhesive which includes a compound, e.g. a polyurethane having active isocyanate groups. The adhesive may be linear polyether glycol urethanes, linear polyester glycol urethanes, adhesives based on natural rubber, synthetic rubber such as neoprene and butadiene-acrylonitrile copolymers especially adhesives containing heat advancing phenolic resins and magnesium reacted heat advancing alkyl constituted phenolic resins, curing type epoxy resins and resinous polyesters. The adhesive composition must be applied in liquid form when the photo-sensitizer and -free isocyanate or an adhesive component providing -NCO groups are included, but otherwise may be applied as solution, pre-formed film, powdered, melt. The Examples relate to the bonding of two strips of polyethylene, polypropylene, ethylene-propylene-diene terpolymer, ethylenepropylene-diene terpolymer coated polyester fibre fabric, or vinyl fluoride polymer and the bonding of a rubber heel to a polyethylene heel rise element subjected to roughening.