Patent GB-1036790-A (GB)
Title: Stiffener inserts for footwear articles
IPC: D06N3/04
Filed: 1963-11-12
Abstract: A coating or impregnating composition comprises a thermosettable aminoplast resin which is a condensation product of 1.5 to 6.0 mols of an aldehyde per mol of an aminotriazine compound, and a thermoplastic styrene polymer. The thermoplastic styrene polymer and the aminoplast resin may be present in the relative weight ratio of 1:1 to 10.  The styrene polymers exemplified are latices of copolymers of styrene with 2-ethylhexyl acrylate, acrylonitrile and methacrylic acid, or, with butadiene and those listed are copolymers of styrene, containing at least 50% by weight of styrene units, with monomers having the vinylidene grouping, e.g. ethylene, propylene, isobutylene, butadiene, isoprene; unsaturated carboxylic acids and derivatives thereof, e.g. acrylic and methacrylic acids, acrylamide and methacryl amide, acrylonitrile and methacrylonitrile, and acrylic and methacrylic acid esters of C1- 18 alcohols; vinylidene aromatic compounds, e.g. a -methylstyrene, vinyltoluene, p-ethylstyrene, 2,4 - dimethylstyrene, o - chlorostyrene, 2,5-dichlorostyrene and vinyl naphthalene; a -b  unsaturated polycarboxylic acids and derivatives thereof, e.g. maleic anhydride, diethyl maleate and dibutyl fumurate. A blend of two or more styrene polymers may be employed if desired. The composition may contain as solvent a mixture of water and isopropyl alcohol.  Examples of aminotriazine compounds are melamine, ammeline, formoguanamine, N-methyl-melamine, N-phenyl melamine and methylol melamine.  Examples of aldehydes are formaldehyde, p-formaldehyde, benzaldehyde and acetoaldehyde.ALSO:A stiffener insert for footwear articles, defined as an article formed in stiff sheet material and shaped to the interior container of the whole, or the upper part only, of the interior of the toe or heel of a shoe, comprises a fibrous substrate coated with a composition comprising a thermosettable aminoplast resin which is a condensation product of 1.5 to 6.0 mols of an aldehyde per mol of an aminotriazine compound, and a thermoplastic styrene polymer.  The thermoplastic styrene polymer and the aminoplast resin may be present in the composition in the relative weight ratio of 1 : 1 to 10.  The thermoplastic styrenepolymer may be an interpolymer of styrene with one or more other polymerizable monomers, examples of which are given, which contains at least 55% by weight of styrene units e.g. a copolymerization product of styrene and 2-ethyl hexyl acrylate, or of styrene, 2-ethylhexyl acrylate, acrylonitrile and methacrylic acid. Suitable aminoplast resins are specified.  The insert may be produced by applying e.g. by spraying or dipping, a composition of the aminoplast resin and the thermoplastic styrene polymer to one or both sides of the fibrous substrate e.g. woven or nonwoven fabric, knitted or felted material, such as cotton duck, to afford a pick-up of the composition such that the dried solids pickup is 30 to 300% based on the weight of the substrate.  A shoe upper, or a shoe having an area thereof stiffened, may be produced by adhering the insert to a further layer of fibrous material constituting an outer layer of the shoe by means of the composition, and setting the composition by heating the assembly.ALSO:A stiffener insert for footwear articles, defined as an article formed in stiff sheet material and shaped to the interior container of the whole, or the upper part only, of the interior of the toe or heel of a shoe, comprises a fibrous substrate impregnated with a composition comprising a thermosettable aminoplast resin which is a condensation product of 1.5 to 6.0 mols of an aldehyde per mol of an aminotriazine compound, and a thermoplastic styrene polymer.  The thermoplastic styrene polymer and the aminoplast resin may be present in the composition in the relative weight ratio of 1 : 1 to 10.  The thermoplastic styrenepolymer may be an interpolymer of styrene with one or more other polymerizable monomers, examples of which are given, which contains at least 55% by weight of styrene units e.g. a copolymerization product of styrene and 2-ethyl hexyl acrylate, or of styrene, 2-ethylhexyl acrylate, acrylonitrile and methacrylic acid.  Suitable aminoplast resins are specified.  The insert may be produced by applying e.g. by spraying or dipping, a composition of the aminoplast resin and the thermoplastic styrene polymer to one or both sides of the fibrous substrate e.g. woven or nonwoven fabric, knitted or felted material, such as cotton duck, to afford a pick-up of the composition such that the dried solids pickup is 30 to 300% based on the weight of the substrate.  A shoe upper, or a shoe having an area thereof stiffened, may be produced by adhering the insert to a further layer of fibrous material constituting an outer layer of the shoe by means of the composition, and setting the composition by heating the assembly.