Patent GB-1088105-A (GB)
Title: Preparation of polymer latices
IPC: C09D157/00
Filed: 1964-02-11
Abstract: Latices of aminoester polymers are prepared by reacting a latex of a polymer containing pendant carboxylic acid groups (or the salt form thereof) with an aziridine of the formula <FORM:1088105/C3/1> where R1 is hydrogen, C1- 10 alkyl or benzyl, R2 and R3 which may be the same or different are hydrogen, C1- 10 alkyl, benzyl or aryl, and R4 i hydrogen or C1- 5 alkyl, until at least some of the pendant carboxylic groups have reacted with the aziridine to form pendant aminoester groups. The carboxylic groups may be attached directly to the polymer chain or through a linking group such as -CO.O.A- where A is alkylene. Aziridines specified are ethyleneimine, 1,2-propyleneimine, N - butylaziridine, 2,2 - dimethylaziridine and 2-ethylaziridine.  The carboxylic polymer latex can be prepared by emulsion polymerization of a monomer mixture comprising a carboxylic acid monomer and at least one copolymerizable compound such as an alkyl acrylate or methacrylate, a conjugated diene, acrylonitrile, styrene, an alkylstyrene, vinyl chloride or vinyl acetate.  The acid monomer preferably is one which has a double bond in alpha, beta-position to the carboxyl group or has a terminal CH2=C grouping; most preferred are acrylic and methacrylic acids and mixtures thereof, although many examples of other acids are also listed.  The acid groups can alternatively be introduced after formation of the polymer.  Examples illustrate the imination of latices prepared by polymerizing (1) ethyl acrylate, methyl methacrylate and methacrylic acid, (2) ethyl acrylate, methyl methacrylate and acrylic acid, (3) ethyl acrylate, methyl methacrylate and itaconic acid, (4) butyl methacrylate and methacrylic acid, (5) butadiene, methyl methacrylate and methacrylic acid in aqueous emulsion employing sodium lauryl sulphate as emulsifier and potassium persulphate as catalyst; and also (6) 2-ethylhexyl acrylate, methyl methacrylate and methacrylic acid using octylphenol polyglycol ether and sodium metabisulphite as additional emulsifier and catalyst components respectively.  The treated latices are useful in adhesive and coating applications for which purposes they may include additives such as talc, mica, titanium dioxide, potassium tripolyphosphate, antifoam agent based on partly sulphonated fatty acids, phenyl mercury oleate, ethylene glycol, methyl cellulose, polyacrylic acid, polyethoxylated alcohol surfactant, and anthraquinone vat dyes.ALSO:Latices of amino-ester polymers, obtained by iminating carboxylic group-containing polymers in latex form (see Division C3) are suitable for coating a variety of substrates, e.g. wood, plastics, fabrics, paper, man-made leather, treated or untreated walls and ceilings, metals, masonry and cement-asbestos sheet materials.  Metal articles are preferably first passivated, e.g. in a chromate, phosphate or anodizing bath.  The latices may include optional ingredients such as talc, mica, titanium dioxide, potassium tripolyphosphate, antifoam agent based on partly sulphonated fatty acids, phenyl mercury oleate, ethylene glycol, methyl cellulose, polyacrylic acid, surfactants and anthraquinone vat dyes.  Examples illustrate a paint suitable for a house exterior, and a composition for coating man-made leather by spraying followed by a clear pyroxylin lacquer coating.  In the Examples, the amino-ester polymers are the reaction products of copolymers of acrylic, methacrylic or itaconic acid with ethyleneimine, 1,2-propyleneimine, N-butylaziridine, 2,2-di-methyl-aziridine or 2-ethylaziridine.