Abstract: The present invention relates to a new process for the preparation of ammeline and/or ammelide from melamine by a solid-to-solid reaction in an aqueous reaction mixture comprising a biocatalyst, wherein the biocatalyst comprises at least one enzyme belonging to the amidohydrolase superfamily and having aminohydrolase activity towards 1,3,5-triazine compounds. The invention further relates a product obtainable by the process according to the invention, wherein the product comprises ammeline and/or ammelide.

Abstract: The invention relates to a flame-retardant polyamide composition comprising a polyamide with a melting temperature higher than 265° C. and ammeline and/or ammelide, in which the ammeline and/or ammelide is obtainable by a biocatalytic process from melamine in an aqueous reaction mixture comprising a biocatalyst, wherein melamine is converted into ammeline and optionally further into ammelide.

Abstract: The present invention relates to a semi-crystalline semi-aromatic polyamide consisting of 95-100 mole % of monomeric units derived from diamine comprising aliphatic diamine comprising 5-40 mole % of a cycloaliphatic diamine, and dicarboxylic acid comprising at least 50 mole % of naphthalene dicarboxylic acid (N), or biphenyl dicarboxylic acid (B), or a combination thereof.

Abstract: The invention relates to a process for preparing a salt from diamine and dicarboxylic acid, the process comprising contacting a diamine gas, having a gas temperature T-gas, with a dicarboxylic acid, thereby forming a reaction mixture comprising diamine/dicarboxylic acid salt, wherein the dicarboxylic acid and the reaction mixture are kept at a temperature T-mixture of at least 10° C. below the lowest of the melting temperature of the dicarboxylic acid (Tm-acid) and the melting temperature of the resulting diamine/dicarboxylic acid salt (Tm-salt). The invention also relates to a process for preparing a polyamide comprising preparing a salt from diamine and dicarboxylic acid.

Abstract: The present invention relates to a new process for the preparation of ammeline and/or ammelide from melamine by a solid-to-solid reaction in an aqueous reaction mixture comprising a biocatalyst, wherein the biocatalyst comprises at least one enzyme belonging to the amidohydrolase superfamily and having aminohydrolase activity towards 1,3,5-triazine compounds. The invention further relates a product obtainable by the process according to the invention, wherein the product comprises ammeline and/or ammelide.

Abstract: The invention relates to a process for preparing a semi-aromatic polyamide from diamine and dicarboxylic acid, comprising steps of •(i) dosing a liquid diamine to an agitated powder comprising an aromatic dicarboxylic acid thereby forming a powder comprising a diamine/dicarboxylic acid salt (DD-salt), and •(ii) solid-state polymerizing the DD-salt to obtain the polyamide.

Abstract: The invention relates to a process for the preparation of semi-crystalline semi-aromatic polyamide by direct solid-state polymerization of a diamine-dicarboxylic acid salt, comprising steps of (a) providing at least two salts of terephthalic acid and diamine, wherein each of these diamine/terephthalic acid salts is in solid state and has a melting temperature of at least Tx, wherein Tx is at least 260° C.; (b) preparing a mixture of the diamine/terephthalic acid salts, while retaining the salts in solid state; and (c) heating the mixture obtained from step (b) in the solid state to a temperature (T-c) in the range from 200° C. to 260° C., under a pressure below the saturation vapor pressure of water at said temperature, thereby condensing and polymerizing the salts and forming a semi-crystalline semi-aromatic polyamide in solid form.

Abstract: The invention relates to a flame-retardant polyamide composition comprising a polyamide with a melting temperature higher than 265° C. and ammeline and/or ammelide, in which the ammeline and/or ammelide is obtainable by a biocatalytic process from melamine in an aqueous reaction mixture comprising a biocatalyst, wherein melamine is converted into ammeline and optionally further into ammelide.

Abstract: The invention relates to a process for the preparation of semi-crystalline semi-aromatic polyamide by direct solid-state polymerization of a diamine-dicarboxylic acid salt, comprising steps of (a) providing at least two salts of terephthalic acid and diamine, wherein each of these diamine/terephthalic acid salts is in solid state and has a melting temperature of at least Tx, wherein Tx is at least 260° C.; (b) preparing a mixture of the diamine/terephthalic acid salts, while retaining the salts in solid state; and (c) heating the mixture obtained from step (b) in the solid state to a temperature (T-c) in the range from 200° C. to 260° C., under a pressure below the saturation vapour pressure of water at said temperature, thereby condensing and polymerizing the salts and forming a semi-crystalline semi-aromatic polyamide in solid form.

Abstract: The invention relates to process for the production of a PA-MXDT/ZT polyamide comprising the following steps: (i) providing a solid MXDT/ZT salt, wherein MXD is meta-xylylenediamine, T is terephthalic acid, Z is a linear aliphatic diamine having from 2 to 12 carbon atoms and wherein the amount of Z is from 0 to 40 mole % with respect to the total of the amount of MXD and Z units in the polymer, (ii) solid state polymerizing the MXDT/ZT salt to obtain the polyamide, wherein the solid state polymerization is carried out at least partly under a diamine atmosphere. The invention further relates to a PA-MXDT/ZT polyamide, wherein the polymer has a glass transition temperature fulfilling the following relation: Tg>226?475*Y, wherein Y is the weight ratio g/g of all CH2 groups in the polymer with respect to the total weight of the polyamide.

Abstract: The invention related to a process for the production of a PA-MXDT/ZT polyamide copolymer comprising the following steps: •i. providing a solid MXDT/ZT salt, wherein MXD is meta-xylylenediamine, T is terephthalic acid, Z is a linear aliphatic diamine having from 2 to 12 carbon atoms and wherein amount of Z is from 5 to 40 mole % with respect to the total amount of MXD and Z units in the copolymer and wherein the MXDT/ZT salt is provided by dosing of liquid diamines MXD and Z to a powder of terephthalic acid; •ii. heating the solid MXDT/ZT salt to a first condensation temperature (Tc1) thereby condensing the salt in solid state to produce a solid polyamide copolymer, wherein Tc1 is below the melting temperature (Tm-salt) of said salt. The invention further relates to a PA-MXDT/ZT polyamide copolymer, wherein MXD is meta-xylylenediamine, T is terephthalic acid, Z is a linear aliphatic diamine having from 2 to 12 carbon atom, Z is from 5 to 40 mole % with respect to the total of MXD and Z units in the copolymer.

Abstract: The invention relates to a process for preparing a semi-aromatic polyamide from diamine and dicarboxylic acid, comprising steps of •(i) dosing a liquid diamine to an agitated powder comprising an aromatic dicarboxylic acid thereby forming a powder comprising a diamine/dicarboxylic acid salt (DD-salt), and •(ii) solid-state polymerizing the DD-salt to obtain the polyamide.

Abstract: The invention relates to a process for preparing a salt from diamine and dicarboxylic acid, the process comprising contacting a diamine gas, having a gas temperature T-gas, with a dicarboxylic acid, thereby forming a reaction mixture comprising diamine/dicarboxylic acid salt, wherein the dicarboxylic acid and the reaction mixture are kept at a temperature T-mixture of at least 10° C. below the lowest of the melting temperature of the dicarboxylic acid (Tm-acid) and the melting temperature of the resulting diamine/dicarboxylic acid salt (Tm-salt). The invention also relates to a process for preparing a polyamide comprising preparing a salt from diamine and dicarboxylic acid.

Abstract: The present invention relates to a novel process for preparing solid, small particles comprising melamine cyanurate in essentially crystalline form. A concentrated aqueous dispersion is prepared of a mixture of cyanuric acid and melamine and selected surfactants are added to the dispersion.

Abstract: The invention relates to a hydroxy-aromatic resin, prepared by bringing together and reacting a hydroxy-aromatic compound and glyoxylic acid. The invention further relates to use of the resin in adhesives, laminates, and coatings.

Abstract: The invention is directed to a thermosetting powder paint composition comprising a thermosetting amorphous polyamide. The amorphous polyamide has a glass transition temperature between 20° C. and 200° C. The polyamide may be a carboxyl-, a hydroxyl- or an amine functional polyamide. A carboxyl functional polyamide has an acid number between 10 and 150 mg of KOH/gram of resin. The invention also relates to a thermosetting powder paint composition comprising a thermosetting amorphous polyamide and an additive comprising a copper halogenide and another halogenide. The invention further relates to a process for coating a substrate at low temperature cure (LTC) conditions and a composition suitable for LTC.

Abstract: The invention relates to a hydroxy-aromatic resin, prepared by bringing together and reacting a hydroxy-aromatic compound and glyoxylic acid, The invention further relates to use of the resin in adhesives, laminates, and coatings.

Abstract: Process for increasing the molecular weight of a polyamide comprising a first step, wherein the polyamide is contacted in countercurrent with a first stream comprising 15 to 100 wt. % H2O and 85 to 0 wt. % N2 at a temperature between 90 and 180° C. and for a time between 5 and 10 hours and a second step, wherein the polyamide obtained in the first step is contacted in countercurrent with a second stream comprising 90 to 100 wt % N2 and 10 to 0 wt % H2O at a temperature between 130 and 200° C. and for a time between 10 and 30 hours.

Abstract: The invention relates to agglomerates of flame-retardants, in particular melamine cyanurate, containing aggregates with an average size of between 0.1 and 50? bonded to each other with the aid of an auxiliary material. This auxiliary material is present in a concentration of between 0.1 and 10 wt. %, relative to the total agglomerates weight, and has a softening point higher than 40° C. The invention further relates to a method for producing said agglomerates, the use of the agglomerates in the preparation of polymer compositions, and polymer compositions containing melamine cyanurate.

Abstract: The present invention relates to a novel process for preparing solid, small particles comprising melamine cyanurate in essentially crystalline form. A concentrated aqueous dispersion is prepared of a mixture of cyanuric acid and melamine and selected surfactants are added to the dispersion.