Abstract: A method of filling a cavity in a building block with aminoplast resin foam comprises locating a template (6,7) against and in sealing relation to that face of the block having said cavity opening therefrom characterized in that an aperture (5) defined in said template and at least as large as the opening in the block which communicates with the cavity is aligned and registered with said opening, followed by passing curable aminoplast resin foam into the cavity under pressure to fill said cavity and form an upstand (9) of foam relative to the face of the block in the space defined by the thickness of the template, and then removing the template to leave at least some of said upstand projecting from said face.

Abstract: A fibre and method of making the fibre. The fibre consists at least in part of a cationic amino-formaldehyde resin and may also include a carrier material which is a water-soluble fibre-forming polymer.Fibres can be made by a wet-spinning method. An aqueous solution of the resin is mixed with an aqueous solution of polyvinyl alcohol to form a spinning solution and the spinning solution is extruded into a coagulation bath to form a fibre, which is dried and cured.The cationic amino-formaldehyde resin comprises the reaction product of a triazine, optionally urea, and formaldehyde and a compound, such as di- or tri-ethanolamine to render the resin cationic. It may be mixed with another cationic amino-formaldehyde resin, e.g. a cationic urea-formaldehyde resin, in the making of the fibre.

Abstract: Here is described the manufacture of a cured urea/formaldehyde resin foam having a shrinkage on drying of less than 20% by volume, by a method which includes the step of producing a homogeneous wet foam from an aqueous resin solution and an aqueous solution of a hardener for the resin, the freshly made wet foam having a total reactive resin solids content of at least 35% by weight. Apparatus for producing the cured resin foam includes a foaming column having upstream and downstream regions constituted by different inert materials.

Abstract: An upstroking compression moulding press includes a pair of side frame members to support an upper, fixed platen which is pivotably supported between said members, said platen having locking means thereon comprising a bar extending over at least the thickness of both of said sideframe members and the distance between them, together with means for displacing said bar from a first position in which it is spaced from said members and a second position in which end portions of the bar are received in notches in said members.

Abstract: Improved resins are obtained by substituting urea for part of the melamine in known cationic water-soluble resins obtained by interaction of melamine, an aliphatic hydroxymonoamine such as triethanolamine, and formaldehyde. The new resins, which have molar ratios melamine:urea:hydroxyamine:formaldehyde in the range 1:0.25-8:0.1-2.5:4-30, have a faster curing rate and better stability in the liquid state for a given content of formaldehyde.

Abstract: A liquid coating composition comprises the following ingredients A, B and C dissolved in the following weight proportions in an organic solvent:A. A non-oxidizing oil-free cross-linking alkyl resin containing free carboxylic acid groups, 20-60%,B. An alkylated amino-formaldehyde resin, 15-60%C. A vinyl chloride/vinyl acetate copolymer which contains free primary hydroxyl groups, free carboxylic acid groups or oxirane groups, 5-50%The composition is particularly suitable for application to flexible PVC sheet, and is heat-curable to a film whose adhesion to such sheet does not seriously deteriorate on aging.

Abstract: A thermoplastic polymer composition of an aliphatic polyamide and a modifier. The modifier is a copolymer of nylon 6 and an acrylic polymer, its inclusion in the composition enabling the properties of the aliphatic polyamide (e.g. nylon 6, nylon 66, nylon 11) to be modified without need of co-condensation with the modifier.The modifier copolymer is 0.5 to 50 percent by weight of the composition. The proportion of acrylic polymer in the copolymer is not more than 25 percent by weight. The acrylic polymer comprises molecular chains derived from acrylonitrile or from a major proportion of an alkyl ester of acrylic or methacrylic acid and a minor proportion of a copolymerizable unsaturated carboxylic acid.The preferred acrylic polymer is a multi-phase polymer comprising a first, elastomeric, phase and a second, rigid thermoplastic, phase.The composition can be used for moulding articles.

Abstract: A method of making a cured foamed amino formaldehyde product utilizes an amino formaldehyde precondensate of water content below 20% by weight in order to obtain a less brittle product. A liquid foamable composition is made by dispersing a curing catalyst and a blowing agent in the precondensate and the composition is heated to cause the blowing agent to form a foam and the precondensate to cure.

Abstract: A method for the manufacture of an aminoformaldehyde resin. An amino compound is reacted with formaldehyde or paraformaldehyde in the liquid phase the latter being ensured by the presence of a reactive modifier in the reaction mixture. The reactive modifier comprises an amino-formaldehyde resin which is capable of reaction with further monomers and capable of rendering the mixture of reactants liquid at least at the temperature at which the reaction is to be carried out.

Abstract: A polyester resin composition comprising a thixotropic solution of an unsaturated polyester resin in a volatile monomer containing also a polymer which is partially incompatible with the polyester resin solution i.e. forms a hazy solution in it. The partially incompatible polymer can be a polymer of an ester of an unsaturated carboxylic acid.

Abstract: An intumescent composition comprising a polymeric binder, a mineral acid catalyst, a source of carbon, and a blowing agent in which the polymeric binder is a solution of a plasticized unsaturated polyester in an unsaturated monomer.

Abstract: Apparatus for manufacturing low density, cured urea/formaldehyde resin foams includes a centrifugal mixing head comprising a casing and an impeller rotatably mounted therein, the casing having an inlet directed generally axially with respect to the axis of rotation of the impeller and an outlet directed generally tangentially relative to said axis.

Abstract: Here is disclosed a method of manufacturing building blocks filled with a cured aminoplast resin foam by forming a curable foam, presenting the cavity to and in sealing relationship with one end of a delivery pipe for the foam and injecting the curable foam through the delivery pipe into the cavity until a back pressure is developed in the delivery pipe. Apparatus for manufacturing the building blocks is also described.

Abstract: An intumescent composition comprising a resinous binder, an inorganic acid source, a carbon source and a blowing agent, the blowing agent comprises(a) a 2-amino s-triazine of general formula ##STR1## in which R.sup.1 and R.sup.2 are the same of different and are each selected from hydrogen, halogen, hydroxyl and amino groups and alkyl, substituted alkyl, alkenyl and substituted alkenyl groups containing up to 6 carbon atoms and(b) a saturated or unsaturated polybasic carboxylic acid containing no more than 2 non-carboxyl carbon atoms per carboxyl group.

Abstract: A method of producing pigmented extrudates or mouldings from an unpigmented thermosetting moulding material, which comprises roughly blending a pigment component with an aminoplast moulding material substantially free from pigment and having an average particle size not greater than 150 microns, and completely dispersing the pigment compound through the aminoplast moulding material by progressing the rough blend through an extruder or injection moulding machine having a barrel grooved in accordance with German Offenlegungschrift No. 2514307, and extruding or injection moulding the resulting pigmented material.

Abstract: A polymeric amide which comprises:(i) from 30% to 60% by weight of units derived from .epsilon.-caprolactam or .epsilon.-aminocaproic acid(ii) from 25% to 55% by weight of units derived from equimolar quantitites of hexamethylene diamine and isophthalic acid and(iii) from 5% to 35% by weight of units derived from equimolar quantities of hexamethylene diamine and adipic acid.The polymeric amide can be used as a hot melt adhesive.

Abstract: A method of producing moulded plastics articles by a continuous moulding or extrusion operation which comprises providing in a screw machine a blend of filler and the precursors of a synthetic thermosetting material and operating the screw machine to (a) intimately mix the filler and the precursors or an uncured condensate thereof and plasticize the mixture and (b) convey the intimate mixture directly to a mould or extrusion head. The mixture is cured after being conveyed to the mould or extrusion head.

Abstract: A powder coating material comprises a copolymer of an ethylenically unsaturated ester and from 11% by weight to 15% by weight (based on the weight of the copolymer) of an .alpha., .beta.-unsaturated carboxylic acid, cross-linked with a di- or polyepoxide resin.

Abstract: A screw-housing for an extruder or injection moulding machine, having a longitudinal bore on the internal surface of which is defined grooving, preferably in the form of a number of equidistantly spaced grooves, extending longitudinally throughout substantially the whole length of the housing or alternatively throughout a major portion of the length of the housing downstream of the feed zone thereof.