Compositions for producing aminoplast products and method...

C - Chemistry – Metallurgy – 08 – G

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C08G 12/00 (2006.01) C08G 12/30 (2006.01) C08G 12/32 (2006.01) C08G 12/42 (2006.01) C08L 61/26 (2006.01) C08L 61/28 (2006.01) D01F 6/00 (2006.01) D01F 6/76 (2006.01)

Patent

CA 2489380

Compositions for producing aminoplast products by means of melt processing consist of: A) 95 to 99.9 % by mass of solvent-free meltable polycondensates of melamine resins having molar masses ranging from 300 to 300000; A) 0.1 to 5 % by mass of weak acids serving as thermoinducible curing agents consisting of: acidifiers of the blocked sulfonic acid type; aliphatic C4-C18 carboxylic acids; aromatic C7-C18 carboxylic acids; alkali salts or ammonium salts of phosphoric acid; C1-C12 alkyl esters or C2-C8 hydroxyalkyl esters of C7-C14 aromatic carboxylic acids or of inorganic acids; salts of melamine or of guanamines having C1-C18 aliphatic carboxylic acids; anhydrides, half-esters or half-amides of C4-C20 dicarboxylic acids; half-esters or half-amines of copolymers consisting of ethylenically unsaturated C4-C20 dicarboxylic acid anhydrides and ethylenically unsaturated monomers of the C2-C20 olefin type and/or C8-C20 vinyl aromatic compounds; and/or salts of C1-C12 alkyl amines or alkanolamines having C1-C18 aliphatic, C7-C14 aromatic or alkylaromatic carboxylic acids and inorganic acids of the hydrochloric acid, sulfuric acid or phosphoric acid type, and; B) optionally up to 400 % by mass of fillers and or reinforcing fibers, up to 30 % by mass of additional reactive polymers of the ethylene copolymer, maleic anhydride copolymer, modified maleic anhydride copolymer, poly-(meth)acrylate, polyamide, polyester and/or polyurethane type, and up to 4 % by mass, each time with regard to the polycondensates of melamine resins, of stabilizers, UV absorbers and/or auxiliary agents. These inventive compositions can be processed by means of melt processing into products such as panels, coated supporting materials, profiled pieces, pipes, injection-molded articles, fibrous products and laminates.

L'invention concerne des compositions destinées à la fabrication de produits aminoplastiques par traitement de fusion. Lesdites compositions comportent A) 95 à 99,5 % en poids de polycondensats fusibles exempts de solvants, de résines mélaminiques ayant des masses molaires de 300 à 300000 ; A) 0,1 à 5 % en poids d'acides faibles servant de durcisseurs thermo-inductibles, constitués d'acidogènes du type acide sulfonique bloqué, acides C¿4?-C¿18?-carboxyliques aliphatiques, acides C¿7?-C¿18?-carboxyliques aromatiques, sels alcalins ou sels d'ammonium de l'acide phosphorique, C¿1?-C¿12?-alkylesters ou C¿2?-C¿8?-hydroxyalkylesters d'acides C¿7?-C¿14?-carboxyliques aromatiques ou d'acides anorganiques, de sels de mélamines ou guanamines contenant des acides C¿1?-C¿18?-carboxyliques aliphatiques, d'anhydrides, de demi-esters ou de demi-amides d'acides C¿4?-C¿20?-dicarboxyliques, de demi-esters ou de demi-amides de copolymères d'anhydrides d'acides C¿4?-C¿20?-dicarboxyliques à insaturation éthylénique et de monomères à insaturation éthylénique du type C¿2?-C¿20?-oléfines et ou C¿8?-C¿20?-vinylaromates, et/ou de sels de C¿1?-C¿12?-alkylamines ou alcanolamines contenant des acides C¿1?-C¿18?-carboxyliques aliphatiques, C¿7?-C¿14?-carboxyliques aromatiques ou alkylaromatiques, et d'acides anorganiques du type acide muriatique, acide sulfurique ou acide phosphorique ; et B) éventuellement jusqu'à 400 % en poids de charges et/ou fibres de renforcement, jusqu'à 30 % en poids d'autres polymères réactifs du type copolymères éthyléniques, copolymères d'hydrure d'acide maléique, copolymères d'hydrure d'acide maléique modifiés, poly(méth)acrylate, polyamides, polyesters et ou polyuréthanes, et jusqu'à 4 % en poids par rapport au polycondensats, de résines mélaminiques, stabilisateurs, absorbeurs UV et/ou agents auxiliaires. Lesdites compositions peuvent être formées par traitement de fusion en tant que plaques, supports revêtus, profilés, tubes, articles moulés par injection, produits de fibres et laminés.

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