Abstract:
The invention relates to an aqueous polymer dispersion containing at least one polyurethane dispersed in an aqueous phase, with at least one uretdione group and at least one solid polyamine with a deactivated surface. The polymer dispersion can be used as an adhesive, a coating agent or a sealant or for producing adhesive, coating or sealing compositions. The compositions can be activated thermally or by electromagnetic radiation.
Abstract:
Cuerpo moldeado de múltiples capas que contiene lignocelulosa, compuesto porA) una capa intermedia o una pluralidad de capas intermedias, que contienen partículas con lignocelulosa, que sepueden obtener utilizando una sustancia aglutinante (a), yB) una capa superficial o una pluralidad de capas superficiales, que contienen partículas con lignocelulosa, 5 que sepueden obtener utilizando una sustancia aglutinante (b),en donde la sustancia aglutinante (a) se selecciona del grupo compuesto por (a1) resinas de formaldehído y (a2) unisocianato orgánico con, al menos, dos grupos de isocianatos;caracterizado porque la sustancia aglutinante (b) contiene los siguientes componentes:un componente acuoso (I) que contiene(i) un polímero A compuesto por los siguientes monómeros:a) 70 a 100 % en peso de, al menos, un ácido monocarboxílico y/o dicarboxílico etilénicamente insaturado(monómero/s A1), yb) 0 a 30 % en peso de, al menos, otro monómero etilénicamente insaturado, que se diferencia del monómero A1(monómero/s A2),y eventualmente(ii) un agente reticulador de bajo peso molecular con, al menos, dos grupos funcionales que se seleccionan delgrupo hidroxi, ácido carboxílico y sus derivados, amina primaria, secundaria y terciaria, epoxi, aldehído,y eventualmente un componente (II) como una dispersión acuosa, que contiene uno o una pluralidad de polímerosM, compuesto por los siguientes monómeros:a) 0 a 50 % en peso de, al menos, un monómero etilénicamente insaturado que contiene, al menos, un grupo epoxiy/o, al menos, un grupo hidroxialquilo (monómero/s M1), yb) 50 a 100 % en peso de, al menos, otro monómero etilénicamente insaturado, que se diferencia del monómero M1(monómero/s M2),así como eventualmente aditivos convencionales como el componente (III)y en donde la sustancia aglutinante (b) contiene captadores de formaldehído, para el caso en que la sustanciaaglutinante (a) contenga una resina de formaldehído.
Abstract:
The present invention relates to a method for the reduction of the formaldehyde emission of wood-base materials by application of nitrogen-containing compounds, wherein (i) a mixture which comprises at least one polyamine and, if appropriate, up to 20% by weight, based on the mixture, of urea is applied to the wood-base material; (ii) polyamine is applied on or in the particle or fiber cake; (iii) polyamine is applied to the coating substrate used for surface finishing and/or (iv) polyamine is applied to the exposed areas; the polyamines having a molecular weight of at least 500 g/mol and at least 6 primary or secondary amino groups.
Abstract:
Disclosed is a method for the reduction of the formaldehyde based emission of wood-base materials containing formaldehyde based binding agents, by application of nitrogen-containing compounds, wherein (i) a mixture which comprises at least one polyamine and, if appropriate, up to 20% by weight, based on the mixture, of urea is applied to the wood-base material; (ii) polyamine is applied on or in the particle or fiber cake; (iii) polyamine is applied to the coating substrate used for surface finishing and/or (iv) polyamine is applied to the exposed areas; the polyamines having a molecular weight of at least 500 g/mol and at least 6 primary or secondary amino groups.
Abstract:
Multi-layered lignocellulosic molded bodies comprising A) a middle layer or multiple middle layers containing lignocellulosic particles, said layer/layers obtained through the use of a binder (a) and B) a cover layer or multiple cover layers containing lignocellulosic particles, said layer or layers obtained through the use of a binder (b), wherein a binder (a) is selected from the group consisting of (a1) formaldehyde resins and (a2) an organic isocyanate with at least two isocyanate groups; wherein binder (b) contains the following components: an aqueous component (I) comprising (i) a polymer A constructed of the following monomers: a) 70 to 100 wt.-% of at least one ethylenically unsaturated mono and/or dicarboxylic acids (monomer(s) A1 ) and b) 0 to 30 wt.-% of at least one other ethylenically unsaturated monomers that differs from monomers A1 (monomer(s) A2) and optionally (ii) a low molecular weight cross-linking agent comprising at least two functional groups selected from the group of hydroxy, carboxylic acid and derivatives thereof, primary, secondary and tertiary amine, epoxy, aldehyde and optionally a component (II) as an aqueous dispersion comprising one or more polymer(s) M constructed from the following monomers: a) 0 to 50 wt.-% of at least one ethylenically unsaturated monomer containing an epoxide group and/or at least one hydroxyalkyl group (monomer(s) M1), and b) 50 to 100 wt.-% of at least one other ethylenically unsaturated monomer that differs from monomer M1 (monomer(s) M2) and optionally conventional additives as component (III) and wherein binder (b) contains formaldehyde traps in case binder (a) contains a formaldehyde resin.