PREPARATION OF A STABLE COMPOSITION OF RADICALLY COPOLYMERISABLE MONOMERS WHICH CONTAINS AT LEAST ONE MONOMER HAVING UREA FUNCTION(S)

• Main Author: BEAR, MARIE-MAUD
• Format: Patent
• Language: English; Spanish
• Published: 10.04.2003
• Edition: 7
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

The object of the present invention is a method of preparing a stable composition of radically copolymerisable monomers, said composition containing firstly at least one monomer which has at least one urea function in its formula and secondly at least one monomer which does not have an isocyanate function in its formula, said method comprising preparing said monomer(s) having urea function(s) by reaction of two types of reagent: at least one radically copolymerisable monomer which has at least one isocyanate function in its formula with at least one amine selected from primary and secondary amines, and incorporating said monomer(s) which does(do) not have an isocyanate function in its(their) formula, prior to said reaction, together with one of said reagents, before adding the other of said reagents, and/or during the addition of said reagents, and/or after said reaction. Characteristically, within the context of said method, said reaction for preparing said monomer(s) having urea function(s) is carried out in the absence of non-radically polymerisable solvent, with said reagents, monomer(s) having isocyanate function(s) and amine(s), being incorporated in relative proportions such that the isocyanate equivalent/amine equivalent ratio be between 0.98 and 1.02, and advantageously equal to 1, and said monomer(s) having urea function(s) obtained at the end of said reaction is(are) maintained diluted in the solvent which is constituted of said monomer(s) which does(do) not have an isocyanate function in its(their) formula, in the presence of dissolved oxygen. El objeto de la presente invencion es un metodo para preparar una composicion estable de monomeros radicalmente copolimerizables, dicha composicion contiene primero por lo menos un monomero el cual tiene por lo menos una funcion urea en su formula y segundo, por lo menos un monomero el cual no tiene una funcion isocianato en su formula, dicho metodo comprende preparar dicho monomero/s que tiene funcion/es urea por reaccion de dos tipos de reactivo: por lo menos un monomero copolimerizable radicalmente el cual tiene por lo menos una funcion isocianato en su formula con por lo menos una amina seleccionada de aminas primarias y secundarias, e incorporar dicho monomero/s que no tiene una funcion isocianato en su formula, previo a dicha reaccion, junto con uno de dichos reactivos, antes de agregar el otro de dichos reactivos, y/o durante la adicion de dichos reactivos, y/o despues de dicha reaccion; caracteristicamente, dentro del contexto de dicho metodo, dicha reaccion para preparar dicho monomero/s que tiene funcion/es urea, se lleva a cabo en la ausencia de solvente polimerizable no radicalmente, con dichos reactivos, el monomero/s que tiene funcion/es ísocianato y amina, siendo incorporados en una proporcion relativa tal que la relacion equivalente de isocianato/equivalente de amina esta entre 0.98 y 1.02, y convenientemente es igual a 1, y dicho monomero/s que tiene funcion/es urea obtenido al final de dicha reaccion, es mantenido diluido en el solvente el cual esta constituido por dicho monomero/s que no tiene una funcion isocianato en su formula, en la presencia de oxigeno disuelto.