摘要:
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:
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.
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:
The invention relates to novel cross-linkable monomers that may be polymerized with ethylenically unsaturated comonomers to form cross-linkable copolymers. Said copolymers may particularly be used in the form of aqueous dispersions as formaldehyde-free adhesives or as coatings with good water resistance. The cross-linkable monomer is a compound in acid or salt form comprising an anion of the formula (I) and one or more cations for producing electrical neutrality, where R1 and R2 represent, independently of one another, hydrogen alkyl, cycloalkyl, aryl, aralkyl, —COOR5, —COO− cat+ or —CON(R6R7), R6 and R7 represent, independently of one another, hydrogen, alkyl, or aryl, cat+ represents a monovalent cation, and one of the groups R1 or R2 may also represent a group —X—R4—CR5(OH)SO3−), wherein X, R4, and R5 assume one of the meanings listed below, R3 represents hydrogen, alkyl, or aryl, X is selected from the group of direct C—C bond, —O—, —CH2—O—, —CH2—NR8—, —COO— or —CONR8—, R8 represents hydrogen, alkyl, or aryl, R4 represents alkylene, polyoxyalkylene, cycloalkylene, or arylene, and R5 represents hydrogen, alkyl, cycloalkyl, or aryl.
摘要:
The invention relates to mineral wool fiber mats, which are stabilized by means of a binder made of polymers funtionalized with epoxy groups and/or with carboxyl groups and selected cross-linking agents. Said mats can be used as an insulating material and are characterized by low or no formaldehyde emissions.
摘要:
The invention relates to a writing, drawing, decorating or cosmetic pencil comprising a colour-delivering, polymer-bonded lead and a polymer-bonded wood substitute material, the wood substitute material at least partly covering or surrounding the lead along its length, there being disposed, between the lead and the wood substitute material, at least one adhesion promoter layer, the lead and the wood substitute material each comprising at least one polymer, the at least one polymer in the lead being incompatible with the at least one further polymer in the wood substitute material, and the at least one adhesion promoter layer coupling on the one hand to the at least one polymer in the lead and on the other hand to the at least one further polymer in the wood substitute material.
摘要:
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.
摘要:
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.
摘要:
This invention relates to mineral wool fiber batting that is stabilized or bonded by a binder including polymers containing carboxyl groups and selected cross-linking agents. Said mats can be used as insulating material and are characterized by low formaldehyde emissions or the absence thereof.
摘要:
What are described are alkalified compositions comprising an aqueous dispersion of selected polymers, and comprising selected polyaldehydes as crosslinking agents.From these formulations it is possible to produce coating compositions having a very high blocking resistance and having excellent mechanical properties.