Patent GB-1088296-A (GB)
Title: Novel inter-polymers
Inventor: BEAMES ADRIAN NORTON
IPC: C08F20/62
Filed: 1965-06-04
Abstract: Novel interpolymers derived from a polymerizable mixture of 65-94.8% by weight of a C1-8 alkyl ester of an alpha, beta-olefinically unsaturated monocarboxylic acid, 5-34% by weight of vinyl chloride, 0.1-5% by weight of an alpha, beta-olefinically unsaturated carboxy ic acid and 0.1-5% by weight of an N-alkylol amide of an alpha, beta-olefinically unsaturated carboxylic acid are prepared by polymerizing said monomer mixture in an aqueous medium in the presence of a polymerization catalyst to a solids content of 35-60% W/W. The ester monomer may be derived from an acid of the formula CH2=CR-COOH, where R is H, C1-4 alkyl, halogen or CN; acrylates are preferred, e.g. n-butyl acrylate.  Acidic monomers specified are acrylic, methacrylic, ethacrylic and crotonic acids.  Suitable alkylol amides include N-methylolacrylamide, N-methylolmethacrylamide, N-ethanolacrylamide and mono - N - methylolmaleamide.  The aqueous polymerization medium preferably includes an emulsifier, e.g. aliphatic or aromatic sulphates or sulphonates, sulphonated dicarboxylic acid esters and amides, organic phosphate esters, salts of long chain alkylamines, polyether alcohols, fatty alkylolamine condensates and glycol di-esters with fatty acids. Suitable polymerization catalysts include hydrogen peroxide, benzoyl peroxide, caprylyl peroxide, cumene hydroperoxide and sodium, potassium and ammonium persulphates.  Molecular weight regulators may also be present, e.g. n-dodecyl mercaptan, t-dodecyl mercaptan, mixtures of C12-C16 mercaptans, and diisopropyl xanthogen disulphide.  Polymerization is desirably effected to more than 90% conversion of monomers and, preferably, to complete conversion.  The latexes obtained are useful for coating or impregnating fabrics, paper &c. and for binding non-woven fabrics.  For these purposes there may be added to the latex additional emulsifiers; other polymers, e.g. vinyl chloride polymers, butadienestyrene copolymers, butadiene-acrylonitrile copolymers, polyethyl acrylate and melamineformaldehyde resins; thickening or bodying agents, e.g. casein and carboxymethyl cellulose; and curing agents, e.g. 2-amino-2-methyl-propanol hydrochloride, for melamine-formaldehyde resins.ALSO:Latexes suitable for impregnation of paper and for binding nonwoven fabrics comprise novel interpolymers (see Division C3) obtained by polymerising a mixture of a C1-8 alkyl ester of an alpha, beta-olefinically unsaturated monocarboxylic acid, vinyl chloride, an alpha, betaolefinically unsaturated carboxylic acid, and an N-alkylol amide of an alpha, betaolefinically unsaturated carboxylic acid.  Additional emulsifiers, e.g. sodium lauryl sulphate, may be added after polymerisation, and the latex may also include other synthetic polymers, e.g. other addition polymers or melamine-formaldehyde resins, curing agents for such resins, and thickening or bodying agents, e.g. casein and carboxymethyl cellulose.  In an Example bonded webs are produced from nonwoven fabric composed of 95% nylon and 5% acrylic fibre (by weight) employing a latex of a butyl acrylatevinyl chloride-methacrylic acid-N-methylol acrylamide copolymer.ALSO:Latexes suitable in leather finishing and for coating textile fabrics or paper comprise novel interpolymers (see Division C3) obtained by polymerising a mixture of a C1-8 alkyl ester of an alpha, beta - olefinically unsaturated monocarboxylic acid, vinyl chloride, an alpha, betaolefinically unsaturated carboxylic acid, and an N-alkylolamide of an alpha, beta-olefinically unsaturated carboxylic acid.  Additional emulsifiers may be added after polymerisation, and the latex may also include other synthetic polymers, e.g. other addition polymers or melamine-formaldehyde resins, curing agents for such resins, and thickening or bodying agents, e.g. casein and carboxymethylcellulose.