Abstract: The present invention relates to the preparation of heterogeneous, water-resistant polyvinyl ester dispersions having a film-forming temperature of below 10.degree. C., comprising the formation of a homo- or copolymer A, having a glass transistion temperature of more that 20.degree. C., by seed polymerization of a monomer mixture comprising 85-100% by weight of a vinyl ester of carboxylic acids having 1 to 18 carbon atoms,0-10% by weight of an .alpha.,.beta.-unsaturated carboxylic acid and/or of an N-functional compound and0-5% by weight of a polyethylenically unsaturated monomer in the presence of a seed base comprising a copolymer B having a glass transition temperature of below 20.degree. C., comprising45-98% by weight of a vinyl ester of carboxylic acids having 1 to 18 carbon atoms,2-50% by weight of an .alpha.-olefin having 1 to 4 carbon atoms and0-5% by weight of a polyethylenically unsaturated monomer.

Abstract: Polyvinyl alcohol compositions in the form of an aqueous solution are disclosed, where the aqueous polyvinyl alcohol compositions include: (i) polyvinyl alcohol; (ii) at least one polyaldehyde having at least 3 carbon atoms and being masked completely as a water-soluble hydrogen sulfite adduct; and (ii) at least one compound which is acidic in water. The aqueous polyvinyl alcohol compositions are suitable as adhesives and for use in cast films.

Abstract: A redoxcatalyst system capable of being used for free-radical emulsion polymerization of ethylenically unsaturated compounds, comprising at least one oxidizing agent and at least one reducing agent, said reducing agent comprising an at least bifunctional aldehyde having at least 3 carbon atoms which is completely masked as a bisulfite adduct.

Abstract: Heterogeneous, solvent- and plasticizer-free polyvinyl ester dispersions which are stabilized by protective colloids and which have a minimum filming temperature of below 10.degree. C. are disclosed. These dispersions are made of a mixture of(a) a homopolymer or copolymer A having a glass transition temperature of above 20.degree. C., whereby homopolymer or copolymer A includes(i) from 85 to 100% by weight of at least one vinyl ester of carboxylic acids having 1 to 18 carbon atoms;(ii) from 0 to 5% by weight of at least one .alpha., .beta.-unsaturated carboxylic acid;(iii) from 0 to 5% by weight of at least one mono-olefinically unsaturated compound (a3) having at least one amino or amido group, and(iv) from 0 to 5% by weight of at least one polyethylenically unsaturated monomer, and(b) a copolymer B having a glass transition temperature of below 20.degree. C.

Abstract: Polyvinyl ester dispersions comprising a hydrosol of a complex salt of a metal from subgroup 4 of the Periodic Table of the Elements with an organic .alpha.-hydroxy and/or .alpha.-oxo acid as seed base, which hydrosol comprises a surface-active substance, are suitable as adhesive and coating compositions.

Abstract: A redispersible dispersion powder comprising:a) a base polymer selected from the group consisting of vinyl ester homo- and copolymers,b) from 2 to 20% by weight, based on the overall mass of the base polymer a), of polyvinyl alcohol, said polyvinyl alcohol having a degree of hydrolysis of from 70 to 100 mol-% and a viscosity in a 4% aqueous solution of from 2 to 70 mPa.s,c) from 0 to 50% by weight, based on the overall mass of the components a) and b), of anticaking agent,d) from 0.

Abstract: A redoxcatalyst system capable of being used for free-radical emulsion polymerization of ethylenically unsaturated compounds, comprising at least one oxidizing agent and at least one reducing agent, said reducing agent comprising an at least bifunctional aldehyde having at least 3 carbon atoms which is completely masked as a bisulfite adduct.

Abstract: Aqueous emulsion adhesives having a pH from 2 to 6 which comprise homo- or copolymeric polyvinyl esters, polymeric protective colloids, water-soluble compounds which can be complexed with the polymeric protective colloids, and at least partially masked polyaldehydes having at least 3 carbon atoms from which aldehyde groups can be released in a controlled manner in acidic media are suitable for bonding porous and semiporous substrates.