This invention is directed to improved coated products comprising essentially a substrate having a dried, continuous adherent coating of certain colloidally stable polymer latexes thereon which latexes are essentially devoid of conventional wetting agents or surfactants. More particularly, the invention concerns the use as coating materials of polymer latexes containing as the essential ingredient therein, an interpolymer prepared by the essentially continuous addition polymerization in aqueous dispersion of major proportions of an essentially hydrophobic monomer, specified minor proportions of a second relatively hydrophilic ethylenically unsaturated "go-between" comonomer and specified minor proportions of certain copolymerizable ionic water-soluble materials. These latexes are particularly useful for preparing coated products comprising a substrate having a continuous, adherent, dried coating of the latex thereon, which coating has excellent barrier, flexiblity, heat-seal and binding capacity properties.
There is provided a process for preparing a stable polymer emulsion characterized by polymerizing a radical-polymerizable monomer having unsaturated bond by using a water-soluble catalyst in an aqueous medium and in the presence of a water-soluble polymer containing chemically bonded monomeric units of methacrylic acid or its salt and monomeric units of ethylenically unsaturated sulfonic acid or its salt, said polymerization being conducted at a pH of 4 or lower.
A process for reducing the heat-seal temperature requirements of films and coatings produced from high vinylidene chloride polymer latexes comprising having present in films or coatings formed from such latexes, prior to fusion thereof, from about 0.5 to about 5 percent by weight of latex polymer solids of an adduct of an aliphatic alcohol or aliphatic acid and ethylene oxide, such adduct having the formula R-Y CH.sub.2 CH.sub.2 --O .sub.n Z where R is alkyl having from four to about 18 carbon atoms, Y is ##SPC1## n is an integer of from 4 to 25 and Z is hydrogen.
A process for reducing the heat-seal temperature requirements of films and coatings produced from high vinylidene chloride polymer latexes comprising having present in films or coatings formed from such latexes, prior to fusion thereof, from about 0.5 to about 5 percent by weight of latex polymer solids of a polyoxyethylene sorbitan fatty acid monoester containing from about 10 to 20 moles of ethylene oxide and wherein said fatty acid contains from about 12 to 18 carbon atoms.
A process for reducing the heat-seal temperature requirements of films and coatings produced from high vinylidene chloride polymer latexes comprising having present in films or coatings formed from such latexes, prior to fusion thereof, from about 0.5 to about 5 percent by weight of latex polymer solids of an alkyl phenol olefin oxide adduct of the formula ##SPC1## Wherein R.sub.1 is hydrogen or alkyl and R.sub.2 is alkyl wherein the sum of R.sub.1 and R.sub.2 equals from eight to 20 carbon atoms; where Y is hydrogen or methyl; where n is an integer from 6 to 40; and where R.sub.3 is hydrogen or methyl.
Heat-sealable vinylidene chloride polymer coatings having improved anti-blocking tendencies while unexpectedly retaining resistance to oxygen transmission are obtainable by overcoating a preformed normally crystalline vinylidene chloride polymer coating with an aqueous dispersion of the sodium salt of lauryl alcohol sulfate.
