Patent GB-1278808-A (GB)
Title: Reinforced polypropylene and polyethylene
IPC: C03C25/40
Filed: 1969-12-04
Abstract: 1278808 Coating DOW CORNING CORP 4 Dec 1969 [3 Jan 1969] 59191/69 Heading B2E [Also in Divisions B5 C1 and C3] Composites of (a) solid siliceous materials and (b) polymers and copolymers of ethylene and propylene are produced by (1) applying to the surface of a silane X a R 3-a SiR<SP>1</SP> (c) and partial condensates thereof (in which X is the hydroxyl group or a hydrolysable radical; R is a 1-6 C alkyl; R<SP>1</SP> is an organo-functional radical selected from amino, mercapto, aryl, alkaryl and aralkyl of no more than 14C, monovalent linear aliphatic hydrocarbon containing a tertiary hydrogen atom and having no more than 18C and monovalent hydrocarbon containing a vinyl linkage and having no more than 18 C; and a has a value of 2 or 3), (2) applying to the surface of at least one of the silane treated (a) or (b) a chlorinated organic compound (d) selected from octachloro cyclopentene, chlorinated xylene, perchlorinated xylene, perchloro-4, 4-dimethylbiphenyl, chlorendic acid, chlorendic anhydride, octochloropropane, hexachloroethane and trichloromelamine; (3) contacting (a) and (b) with the treated surface or surfaces between them, and (4) applying energy, e.g. heat to the composite of (a), (c), (d) and (b) until a bond is formed between them. The chlorinated organic compound (d) may be applied to (a) or to the surface of (b). The siliceous material may be glass fibres and cloth, asbestos, mica, silica in the form of sand and glass panels. The glass fibres may be in the form of rovings, yarn, chopped fibres, strand and bundles. The silane coating can be applied from aqueous solution and the chlorinated organic compound from, e.g. toluene or acetone, by dipping, brushing or spraying. In a modification the silane and chlorinated material can be dissolved in a mutual solvent and applied from a single bath. The treated siliceous material and the resins may be bonded by contacting the material with molten resin; heating and pressing laminates of treated glass cloth and polymer film; blending the chopped coated glass fibres with resin pellets or powder to form a moulding compound which is injection moulded. Ultraviolet light or gamma radiation can also be applied to the composite. Alternatively, the silane coated siliceous material may be bonded with the chlorinated organic compound coated resins, e.g. by thermo-forming or injection moulding. Further, a blend of the resin particles and a particulate inert carrier, e.g. talc, silicas and clays which has been impregnated or coated with the chlorinated organic compound may be heated to the softening point of the polymer and bonded to the silanetreated siliceous material. In the Examples (3) chopped glass fibres which had been treated with a 2-4% by weight solution of N-(2- aminoethyl)-3-aminopropyl trimethoxy silane and then immersed in a 1.5% by weight solution of octachloro cyclopentene and polypropylene powder were blended using glass fibre loadings of 15, 25, 35 and 45% by weight and injection moulded; (4) polypropylene was blended with 35% chopped glass roving which had been treated by dipping in a toluene bath containing 2% by weight chlorinated xylene and a silane coupling agent. The silanes used were a) mercaptopropyl trimethoxy silane (0.5%), b) as (a) (1%), (c) isobutyl trimethoxy silane (1%), d) vinyltrimethoxy silane (0.8%), phenyltrimethoxy silane (1%), e) gammamethyl-4-dimethylpentyltrichlorosilane (1.2%) and injection moulded; (6) talc was impregnated with various amounts of chlorinated organic material ((a) 20% octochloro cyclopentene, (b) 10% (a), (c) 20% chlorinated xylene, (d) 20% chlorendic anhydride) and added to a blend of 65% by weight polypropylene powder and 35% by weight chopped glass fibre. The glass had been treated with 1.5% by weight solution of: The blends were injection moulded; (7) ground quartz (particle size 5 microns) was ballmilled with 10% by weight octachloro cyclopentene and the treated carrier added to the polypropylene-glass fibre blends described in 6).