Patent GB-1439846-A (GB)
Title: Thermosetting synthetic polymer dispersions and process for production thereof
IPC: C08G81/02
Filed: 1973-06-15
Abstract: 1439846 Thermosetting polymer dispersions DAI NIPPON TORYO CO Ltd 15 June 1973 [16 June 1972 (2)] 28687/73 Headings C3P and C3B [Also in Division B2] Thermosetting synthetic polymer dispersions comprise, dispersed in an organic liquid having no polarity or low polarity, a mixture of: (I) a synthetic polymer dispersion comprising particles of a copolymer formed from (A) 98- 70% by weight of at least one ethylenically unsaturated monomer and (B) 2-30% by weight of at least one ethylenically unsaturated monomer containing a chemically reactive group, there being present around the copolymer particles, as a dispersion stabilizer, a protective layer of an alkyd resin, epoxy resin or urethane resin which is modified by a fatty oil or by an unsaturated acid derived from a fatty oil, the stabilizer being solvated in the organic liquid and the weight ratio of stabilizer: copolymer being from 80 : 20 to 20 : 80; and (II) a synthetic polymer dispersion comprising particles of a copolymer formed from (A) 98- 70% by weight of at least one ethylenically unsaturated monomer and (C) to 2-30% by weight of at least one ethylenically unsaturated monomer having a complementary chemically reactive group, with respect to the reactive group of (B) above, there being present around the copolymer particles, as a dispersion stabilizer, a protective layer of the same type as defined in dispersion I and the weight ratio of stabilizer: copolymer being from 80 : 20 to 20 : 80; dispersions I and II being mixed in a ratio such that the mol. ratio of reactive group of (B) to complementary reactive group of (C) is from 0À5 : 1 to 2À0 : 1, and said monomers (A) containing no reactive or complementary reactive group as present in monomers (B) and (C). In examples the polymer dispersions comprise (1) acrylonitrile/methyl methacrylate/ methacrylic acid/styrene copolymer and acrylonitrile/methyl methacrylate/N-n-butoxy-methyl acrylamide/styrene copolymer; (2) ethyl acrylate/methyl methacrylate/methacrylic acid/styrene copolymer and acrylonitrile/methyl methacrylate/N - n - butoxymethylacrylamide/α- methylstyrene copolymer; (3) acrylonitrile/ methyl methacrylate/2 - hydroxyethyl methacrylate/styrene copolymer and acrylonitrile/ methyl methacrylate/1 : 1 adduct of 2-hydroxyethyl methacrylate and toluene diisocyanate/ styrene copolymer; (4) acrylonitrile/methyl methacrylate/2 - hydroxypropyl methacrylate/ styrene copolymer and acrylonitrile/methyl methacrylate/adduct as in (3)/ethyl methacrylate copolymer; (5) α-methylstyrene/ methyl methacrylate/acrylic acid/styrene copolymer and acrylonitrile/methyl methacrylate/ glycidyl methacrylate/styrene copolymer; (6) acrylonitrile/methyl methacrylate/maleic anhydride/styrene copolymer and n-butyl methacrylate/methyl methacrylate/allyl alcohol/styrene copolymer; and (7) vinyl toluene/methyl methacrylate/glycidyl methacrylate/styrene copolymer and acrylonitrile/methyl methacrylate/ 2 - t - butylaminoethyl methacrylate/styrene copolymer. Also in the examples, the solvent used is mineral spirit and the stabilizer component is an alkyd, epoxy or urethane resin modified with cotton seed, soybean or coconut oil. The dispersions may contain such additives as pigments, dyestuffs, extenders and driers, and may be coated on substrates such as iron, aluminium, zinc, zinc-plated steel, plywood, wooden board, paper, cloth, fabrics and plastics.