摘要:
Compositions containing an aqueous dispersion of selected polymers and selected polyaldehydes as crosslinking agents are described.Adhesives having very high resistance to boiling water can be produced from these formulations.
摘要:
A description is given of an aqueous polymer dispersion which is set to a pH range of 4 to 6 and comprises A) 100 parts by weight of a homopolymer or copolymer produced by emulsion polymerization, B) 0.1 to 15 parts by weight, based on the total amount of the monomers used, of at least one protective colloid, C) 0.1 to 10 parts by weight, based on the total amount of the monomers used, of at least one nonionic emulsifier, D) 10 to 990 ppm by weight, based on the mass of the total dispersion of at least one antioxidant, and E) at least one polyene fungicide. A second variant of the aqueous polymer dispersions is set to a pH range of 4.5 to 5.5 and has components A) to C) and E) but no antioxidant. The protective colloid of the aqueous polymer dispersions has no cellulose ether, or up to 0.45 part by weight of cellulose ether, based on the total amount of the monomers used. The polymer dispersions described are distinguished by excellent polyene-fungicide tolerance and may be used for coating foods.
摘要:
Water-resistant adhesives, their preparation and use A description is given of an aqueous dispersion adhesive based on an aqueous polymer dispersion comprising at least one emulsion polymer with small amounts of crosslinkable N-methylol groups, at least one protective colloid, and at least one crosslinking agent containing N-methylol groups, of which at least one is etherified with an alkanol, said crosslinking agent being selected from the group consisting of hydroxymethylated cyclic ethyleneureas, hydroxymethylated cyclic propyleneureas, hydroxymethylated bicyclic glyoxal diureas, hydroxymethylated bicyclic malonaldehyde diureas or combinations thereof. The aqueous dispersion adhesive can be employed in particular for adhesively bonding porous and semiporous substrates.
摘要:
A description is given of food coating compositions comprising a) a plastics dispersion or a mixture of plastics dispersions comprising at least one homo- or copolymer poly(meth)acrylate having at least 55% by weight (meth)acrylate monomer units and also 0.1 to 30% by weight of at least one protective colloid, and also b) aids and/or additives used for producing food coatings. The coatings are distinguished by sufficiently high water vapor transmission rates, low water absorption capacity and also low reemulsification capacity and have good mechanical properties in the moist state.
摘要:
A decsription is given of an aqueous copolymer poly(vinyl ester) dispersion comprising A) 100 parts by weight of a copolymer derived from A1) from 34.9 to 95% by weight of vinyl esters of aliphatic, saturated carboxylic acids, A2) from 4.9 to 65% by weight of maleic esters and/or fumaric esters of monohydric aliphatic alcohols having a chain length of C1-C18 and/or alpha-olefins having from 2 to 8 carbon atoms, A3) from 0.1 to 10% of at least one comonomer having at least one stabilizing nonionic or ionic group, and also A4) if appropriate, other comonomers, the sum of components A1, A2 and A3 and if appropriate A4 giving 100% by weight, B) from 0.1 to 4.5 parts by weight, based on the total amount of the monomers used, preferably from 0.5 to 3.5 parts by weight of at least one protecting colloid, preferably poly(vinyl alcohol), C) from 0.1 to 10 parts by weight, based on the total amount of the monomers used, preferably from 0.5 to 5.0 parts by weight, of a nonionic emulsifier, and D) if appropriate, further additives suitable for coating foods. The dispersion is produced by free-radical emulsion polymerization and is suitable for coating foods. The films formed from these dispersions are distinguished by a low water-vapor transmission rate.
摘要:
A description is given of an aqueous polymer dispersion comprising A) a polymer dispersion produced by free-radical polymerization of ethylenically unsaturated monomers, B) stabilizers suitable for carrying out the free-radical polymerization, and also C) 0.01 to 20 000 ppm by weight, based on the mass of the total dispersion, of at least one compound of the formula Ia and/or Ib where R1, R2, R13 and R14 independently of one another are hydrogen, C1-C6-alkyl, C1-C6-alkoxy, carboxyl, nitrile, isonitrile, cyano or halogen, R3 to R12 and R15 to R24 independently of one another are hydrogen and selected organic radicals, and at least one of the substituents R3 to R12, or R15 to R24, being hydroxyl and/or alkoxy and/or alkanoyloxy. The aqueous polymer dispersion may be used for coating foods, as color, or as adhesive, and the resultant films are distinguished by high fungicidal resistance.
摘要:
Food coating composition comprising protective-colloid-stabilized polyacrylate dispersions, use thereof and coated foods produced therewith A description is given of food coating compositions comprising a) a plastics dispersion or a mixture of plastics dispersions comprising at least one homo- or copolymer poly(meth)acrylate having at least 55% by weight (meth)acrylate monomer units and also 0.1 to 30% by weight of at least one protective colloid, and also b) aids and/or additives used for producing food coatings. The coatings are distinguished by sufficiently high water vapor transmission rates, low water absorption capacity and also low reemulsification capacity and have good mechanical properties in the moist state.
摘要:
A description is given of an aqueous copolymer poly(vinyl ester) dispersion comprising A) 100 parts by weight of a copolymer derived from A1) from 34.9 to 95% by weight of vinyl esters of aliphatic, saturated carboxylic acids, A2) from 4.9 to 65% by weight of maleic esters and/or fumaric esters of monohydric aliphatic alcohols having a chain length of C1-C18 and/or alpha-olefins having from 2 to 8 carbon atoms, A3) from 0.1 to 10% of at least one comonomer having at least one stabilizing nonionic or ionic group, and also A4) if appropriate, other comonomers, the sum of components A1, A2 and A3 and if appropriate A4 giving 100% by weight, B) from 0.1 to 4.5 parts by weight, based on the total amount of the monomers used, preferably from 0.5 to 3.5 parts by weight of at least one protecting colloid, preferably poly(vinyl alcohol), C) from 0.1 to 10 parts by weight, based on the total amount of the monomers used, preferably from 0.5 to 5.0 parts by weight, of a nonionic emulsifier, and D) if appropriate, further additives suitable for coating foods. The dispersion is produced by free-radical emulsion polymerization and is suitable for coating foods. The films formed from these dispersions are distinguished by a low water-vapor transmission rate.
摘要:
A novel food coating substance comprising a plasticizer-free aqueous copolymer poly(vinyl ester) dispersion of emulsion polymer, emulsifier, protective colloid and optionally other stabilizers is outstandingly suitable for the surface treatment or surface coating of hard cheese or semi-hard cheese, but also of meat products, fruits, nuts or seed material.
摘要:
The present invention relates to water-resistant aqueous dispersion adhesives with prolonged pot life and good color constancy of their bonds, comprising homopolymeric and/or copolymers polyvinyl esters, polymeric protective colloids, water-soluble compounds which can be complexed with the polymeric protective colloids, and derivatives of glyoxal and polyaldehydes having at least 3 carbon atoms, from which aldehyde groups can be controllably released in acidic media. The inventive dispersion adhesives are suitable for adhesively bonding porous and semiporous substrates.