Patent GB-1011810-A (GB)
Title: Binder and process for flocking fibrous material
Inventor: CRAEMER KARL
IPC: D06M15/263
Filed: 1963-06-27
Abstract: A binder for flocking fibrous material comprises a thickened aqueous dispersion of a self-cross-linking copolymer and from 3 to 30% by weight of the total binder of an organic liquid which exerts a swelling, but no dissolving, action on the copolymer. Preferred copolymers are those made from an alkyl acrylate or methacrylate, acrylonitrile or methacrylonitrile N-methylol acrylamide or methacrylamide, an unsaturated carboxylic acid and, optionally, other monomers.  Suitable organic liquids are aliphatic halohydrocarbons, aromatic hydrocarbons, ketones, esters and amides.  Also present in the compositions may be water-dispersible aminoplast condensates, and catalysts for the cross-linking of the copolymers and condensation of the aminoplasts.  Coatings formed from the compositions are cross-linked by heating above 80 DEG  C.  The examples describe the following compositions: (1) an ammonia-neutralized aqueous dispersion of a copolymer of n-butyl acrylate, ethyl acrylate, acrylonitrile, acrylic acid and N-methylolmethacrylamide containing trichloroethylene, dimethylolurea dimethyl ether urea, a sperm oil alcohol/ethylene oxide condensate and ammonium thiocyanate; (2) an ammonia-neutralized aqueous dispersion of a copolymer of isobutyl acrylate, acrylonitrile, N-methylolacrylamide and acrylic acid containing perchloroethylene, the dimethylol compound of butanediol diurethane, a sperm oil alcohol/ethylene oxide condensate and ammonium thiocyanate; (3) an ammonia-neutralized aqueous dispersion of a copolymer of n-butyl acrylate, styrene, acrylonitrile, acrylic acid and the N-methylol ethyl ether of methacrylamide, containing cyclohexanone, a urea-formaldehyde condensate, methyl cellulose, a sperm oil alcohol/ethylene oxide condensate and diammonium phosphate; and (4) an ammonia-neutralized aqueous dispersion of a copolymer of n-butyl acrylate, methyl acrylate, acrylonitrile, divinyl benzene N-methylolmethacrylamide and acrylic acid containing a urea-formaldehyde condensate, trichloroethylene, methyl cellulose, urea, ammonium chloride and ammonium thiocyanate.  Specification 1,011,809 is referred to.ALSO:Fabrics are flocked by applying thereto an adhesive comprising a thickened aqueous dispersion of a self-crosslinking copolymer and from 3-30% by weight of the total composition of an organic liquid which exerts a swelling, but no dissolving, action on the copolymer (see Division C3), flocking the coated fabric, and then heating the assembly at a temperature greater than 80  DEG C. to cross-link the copolymer.  Also present in the compositions may be water-dispersible aminoplast condensates, and catalysts for the cross-linking of the copolymers and condensation of the aminoplasts.  The examples describe the following processes: (1) applying to jute fabric and bonded cotton non-woven fabric an ammonia-neutralized aqueous dispersion of a copolymer of n-butyl acrylate, ethyl acrylate, acrylic acid and N-methylolmethacrylamide containing trichloroethylene and dimethylolurea dimethyl ether, flocking the coated fabrics with nylon-6 flock, and heating at 130 DEG C., (2) applying to cotton cloth, which has been given a waterproof finish with paraffin emulsion, an ammonia-neutralized aqueous dispersion of a copolymer of isobutyl acrylate, acrylonitrile, N-methylolacrylamide and acrylic acid containing the dimethylol compound of butanediol diurethane and perchloroethylene, flocking the coated cloth with viscose flock, and heating at 140  DEG C., (3) applying to jute fabric, which has been coated with polyvinyl chloride paste and then gelled, an ammonia-neutralized copolymer of n-butyl acrylate, styrene, acrylonitrile, the N-methylol ethyl ether of methacrylamide and acrylic acid containing a urea-formaldehyde condensate and cyclohexanone, flocking the fabric with polyamide flock and heating at 120  DEG C., and (4) applying to a cotton fabric, which has been laminated with polyvinyl chloride foam, an ammonia-neutralized aqueous dispersion of a copolymer of n-butyl acrylate, methyl acrylate, acrylonitrile, acrylic acid, N-methylol methacrylamide and divinyl benzene containing a urea-formaldehyde condensate and trichloroethylene, flocking the fabric with polyamide flock, and heating at slightly above 80  DEG C. Specification 1,011,809 is referred to.