Patent GB-842466-A (GB)
Title: Continuous method for production of glass fibre reinforced unsaturated alkyd moulding compound
IPC: C08J5/24
Filed: 1957-07-22
Abstract: A method of producing a stable flowable alkyd moulding composition comprises (a) continuously moving a multiplicity of strands of substantially unexcoriated glass fibres longitudinally through a slurry comprising (i) an unsaturated alkyd resin, (ii) a polymerization catalyst, (iii) an inorganic filter other than glass fibre, and (iv) an organic solvent capable of dissolving the alkyd resin and having a boiling point less than the decomposition temperature of the catalyst, whereby a coating of the slurry adheres to the strands, (b) directing the strands through a heating zone to remove the solvent and render the coating substantially non-tacky, (c) cutting the strands into lenghhs of 1/4 -2 inches and (d) collecting the severed strands to form an air permeable mass.  The slurry may also contain (i) a liquid monomer containing a CH2=CH-group which is miscible with resin (i) and has a boiling point of at least 80 DEG C.; in which case the solvent (iv) must also be a solvent for the monomer and must also be volatile at a temperature less than the boiling point of the monomer, and the heating zone (b) must also be at a temperature below the boiling point of the monomer. The Specification incorporates by reference many materials used in the parent Specification but the following materials are specified:-(i) resins prepared from ethylene glycol, propylene glycol, maleic anhydride and either phthalic or tetrachlorophthalic anhydrides, in the presence of hydroquinone, (ii) benzoyl peroxide with or without tricresyl phosphate, (iii) clay, talc, mica, antho-phyllite barium carbonate, antimony oxide kaolin and pigments, (iv) methylene chloride chloroform, acetone, benzene, methyl ethyl ketone and methyl propyl ketone, and (v) dialkyl phthalate.  Other additives mentioned are a Lignocol beechwood fraction boiling at 180-200 DEG C. and zinc stearate.  It is also stated that the glass fibres may have been sized with aqueous solutions of polyvinyl acetate and softener together with either a methacrylato -chromic chloride complex or a silicone resin (or precursors thereof) especially those derived from unsaturated silanols, e.g. vinyl, allyl or diallyl silanol.ALSO:A multiplicity of strands of substantially unexcoriated glass fibres is moved continuously and longitudinally through a slurry comprising (i) an unsaturated alkyd resin, (ii) a polymerization catalyst, (iii) an inorganic filler other than glass fibre, and (iv) an organic solvent capable of dissolving the alkyd resin and having a boiling point less than the decomposition temperature of the catalyst, whereby a coating of the slurry adheres to the strands; the strands are then directed through a heating zone to remove the solvent and render the coating substantially nontacky, cut into lengths of 1/4 -2 inches, and collected to form an air-permeable mass.  The slurry may also contain (v) a liquid monomer containing a CH2=CH- group which is miscible with resin (i) and has a boiling point of at least 80 DEG C; in which case the solvent (iv) must also be a solvent for the monomer and must also be volatile at a temperature less than the boiling point of the monomer and the heating zone must also be at a temperature below the boiling point of the monomer.  The Specification incorporates by reference many materials used in the parent Specification but the following materials are specified:-(i) resins prepared from ethylene glycol, propylene glycol, maleic anhydride and either phthalic or tetrachlorophthalic anhydrides, in the presence of hydroquinone, (ii) benzoyl peroxide with or without tricresyl phosphate, (iii) clay, talc, mica, anthophyliite, barium carbonate, antimony oxide, kaolin and pigments, (iv) methylene chloride, chloroform, acetone, benzene, methyl ethyl ketone, and methyl propyl ketone and (v) diallyl phthalate.  Other additives mentioned are a Lignocol beechwood fraction boiling at 180-200 DEG C. and zinc stearate.  It is also stated that the glass fibres may have been sized with aqueous solutions of polyvinyl acetate and softener together with either a methacrylato chromic chloride complex or a silicone resin (or precursors thereof) especially those derived from unsaturated silanols, e.g. vinyl, allyl, or diallyl silanol.  The final airpermeable mass of separate flowable coated strands is eventually used as a moulding composition.