Patent GB-1102052-A (GB)
Title: Process for the manufacture of resin impregnated flat materials having a high filler content
IPC: C08J5/24
Filed: 1965-03-05
Abstract: Single or multilayer products comprising sheets of fibrous material such as glass fibre mats or woven fabric impregnation with curable resins are made by impregnating the layer or layers with the liquid resin, applying a powdered filler to the tacky surface(s), and curing the resin, after superposing the layers if more than one, with or without heating or pressing.  The resin may comprise an epoxy resin, for example the condensation product of epichlorohydrin and bis phenol A, or a 40:60 mixture of a diepoxidized acetal of formula: <FORM:1102052/D1-D2/1> prepared from 1, 1-bis (hydroxymethyl) cyclohexane-3 and D 3-tetrahydrobenzaldehyde), and an acetal of formula:  <FORM:1102052/D1-D2/2> prepared from D 3-tetrahydrobenzaldehyde and glycerine. Alternating an unsaturated polyolefin resin, comprising fumaric acid (1 mol), phthalic anhydride (2 mols) ethylene glycol (3 mols) and benzyl alcohol, esterified at 200 DEG C. in nitrogen and dissolved in styrene may be used. Reference is also made to polyalkylester resins, to polyesters from polyhydric alcohols and unsaturated and saturated polybasic acids, with or without copolymerizable monomers such as styrene, acrylic acid and esters. Acrylonitrile, and vinyl esters, and to polyurethanes.  Fillers usable comprise mica powder, powdered TiO2, alumina, aluminium trihydrate, silica, bolus alba, and bural clay. Polymer curing agents specified are; benzoyl peroxide, cyclohexanone peroxide, polybasic carboxylic acids and their polyamides and polyamides of unsaturated acids.  Cobalt naphthenate or octate can be used as drier.  Inorganic or organic fibres can be impregnated, e.g. mats of animal or vegetable fibres, polyamides, or glass fibres or filaments.  The products may be shaped.  Example 10 describes a glass fibre fabric impregnated with an epoxy resin containing dibutyl phthalate, bolus alba, TiO2, and boron trifluoride, sprinkled on both sides with powdered aluminium hydrate is wrapped around a fractured limb and allowed to cure.ALSO:Single or multilayer products comprising sheets of fibrous material such as glass fibre mats or woven fabric impregnation with curable resins are made by impregnating the layer or layers with the liquid resin, applying a powdered filler to the tacky surface(s), and curing the resin, after superposing the layers if more than one, with or without heating or pressing.  The resin may comprise an epoxy resin, for example the condensation product of epichlorhydrin and bis phenol A, or a 40:60 mixture of a diepoxidized acetal of formula <FORM:1102052/A5-A6/1> prepared from 1,1-bis (hydroxymethyl) cyclohexene-3 and D 3-tetrahydrobenzaldehyde), and an acetal of formula <FORM:1102052/A5-A6/2> prepared from D 3-tetrahydrobenzaldehyde and glycerin. Alternating an unsaturated polyester resin, comprising fumanic acid (1 mol), phthalicanhydride (2 mols) ethylene glycol (3 mols) and benzyl alcohol, esterified at 220 DEG C in nitrogen and dissolved in styrene may be used.  Reference is also made to polyallyl ester resins, to polyesters from polyhydric alcohols and unsaturated and saturated polybasic acids, with or without copolymerizable monomers such as styrene, acrylic acid and esters. Acrylonitrile, and vinyl esters, and to polyurethanes.  Fillers usable comprise mica powder, powdered TiO2, alumina, aluminium trihydrate, silica, bolus alba, and bural clay.  The products may be shaped.  Example 10 describes a glass film fabric impregnated with an epoxy resin containing dibutyl phobalate, bolus alba, TiO2 and boron triflouride, sprinkled on both sides with powdered aluminium hydrate is wrapped around a fractured limb and allowed to cure.