Patent GB-1031484-A (GB)
Title: Copolymer dispersions
Inventor: KNAPP KARL-HEINRICH
IPC: D04H1/587
Filed: 1963-02-14
Abstract: Aqueous dispersions of copolymers are made by copolymerizing in aqueous dispersion or emulsion a mixture of (a) 1-50% of a polymer of an aliphatic conjugated diolefine, or a chlorine derivative thereof, (b) 98.8-30% of a C1-C8 alkyl acrylate, and (c) 0.2-20% of a compound of the formula <FORM:1031484/C3/1> <FORM:1031484/C3/2> in which R is hydrogen or methyl, R1 is hydrogen or C1-C8 alkyl, R2 is alkyl, alkenyl, dichloromethyl, or -R3-Z in which R3 is a C1-C3 alkylene group, Z is a -COOH, OSO3H or -SO3H group or sodium, potassium or ammonium salt thereof, or is a cyano group or a group-(CH2CH2O)nH in which n is 1-20, or represents halogen, and R4 and R5 are the same or different and may be C1-C8 alkyl, cycloalkyl or a -R3-Z group, or may together with the adjacent nitrogen atom form a heterocyclic ring, such as in a piperidine or morpholine radical, and in which up to 50% of the acrylic ester may be replaced by other copolymerizable compounds, e.g. acrylic and methacrylic acids and their amides, methacrylate ester, maleic acid and its esters, styrene, alpha-methylstyrene, vinyl and vinylidene chlorides and vinyl esters. Diolefine polymers specified are polybutadiene, polychloroprene and copolymers of butadiene with styrene and/or acrylonitrile. The polymerization may be initiated by the use of peroxy compounds, such as potassium persulphate, which may be activated by reducing agents such as sodium metabisulphite. The resulting graft copolymer dispersions are used for coating and impregnating substrates, followed by the curing of the deposited copolymer by heating. Coating compositions containing the copolymers may also contain condensation products of urea or melamine with formaldehyde.ALSO:Fibrous fleeces are strengthened by treating them with aqueous dispersions of graft polymers obtained by polymerizing an alkyl acrylate and an acrylamide methylol ether or Mannich base with a polydiolefine (see Division C3), then cross-linking the deposited polymer by heating it at 80-130 DEG C. in the presence of an acidic substance.  The Examples describe: (9) impregnating a cellulose fibre fleece with an aqueous dispersion of a graft polymer of n-butyl acrylate, styrene and methacrylamide methyl methylol ether on polybutadiene, the dispersion containing also an ethylene oxideoleyl alcohol condensate, a melamine-formaldehyde precondensate and ammonium chloride followed by cross-linking at 130 DEG , (20) impregnating a fleece of polyamide and cotton fibres with an aqueous dispersion of a graft polymer of n-butyl acrylate and methacrylamide butyl methylol ether on a butadiene-acrylonitrile copolymer, followed by cross linking, (21) as in (20) but using a graft polymer of ethel and n-butyl acrylates, styrene and a methacrylamide methylol ether containing a COOH group in the ether grouping on a butadiene-styrene copolymer, and (22) impregnating a fleece of polyamide and cellulose fibres with an aqueous dispersion of a graft polymer of n-butyl acrylate, acrylamide, acrylonitrile and a methacrylamide Mannich compound or polychloroprene, followed by cross-linking.