Dispersing polymers with improved thermal stability

The invention relates mainly to a polymer comprising a hydrocarbon-based main chain bearing carboxylic groups and polyalkoxylated chains and up to 4% by weight of antioxidant groups, relative to the weight of the final polymer, which are grafted to the main chain. It also relates to a process for preparing such a polymer and to an adjuvant which is of use as a dispersant of suspensions of mineral particles comprising same. Finally, it relates to the use of such a polymer for fluidifying suspensions of mineral particles and reducing the water demand of hydraulic compositions.

DISPERSING POLYMERS WITH IMPROVED THERMAL STABILITY

L'invention vise principalement un polymère comprenant une chaîne principale hydrocarbonée portant des groupes carboxyliques et des chaînes polyalcoxylés et jusqu'à 4% en poids de groupements anti-oxydants par rapport au poids du polymère final greffés à la chaîne principale. Elle vise également un procédé de préparation d'un tel polymère ainsi qu'un adjuvant utile à titre de dispersant de suspensions de particules minérales le comprenant. Enfin, elle vise l'utilisation d'un tel polymère pour fluidifier des suspensions de particules minérales et réduire la demande en eau de compositions hydrauliques.

METHOD FOR PREPARING A SUPERPLASTICIZER

L'invention vise principalement un procédé de préparation de polycarboxylates polyalkoxylés dans lequel l'on fait réagir, en présence d'eau et d'un catalyseur, à une température comprise entre 120 et 250 °C : - au moins un acide polycarboxylique obtenu par polymérisation d'au moins un acide carboxylique insaturé; et au moins un polyéther portant un groupe hydroxyle libre capable de réagir avec une fonction carboxylique dudit acide polycarboxylique, caractérisé en ce que le catalyseur est un sel alcalin ou alcalin-terreux d'un acide protique fort. The invention is aimed primarily at a process for preparing polyalkoxylated polycarboxylates in which, in the presence of water and a catalyst, a temperature of between 120 and 250 ° C is reacted: at least one polycarboxylic acid obtained by polymerizing at least one unsaturated carboxylic acid; and at least one polyether bearing a free hydroxyl group capable of reacting with a carboxylic function of said polycarboxylic acid, characterized in that the catalyst is an alkaline or alkaline-earth salt of a strong protic acid.

Method For Preparing A Superplasticizer

The invention chiefly concerns a method for preparing polyalkoxylated polycarboxylates in which the following are caused to react in the presence of water and a catalyst at a temperature of between 120 and 250° C.: 2. The method according to claim 1 , wherein the catalyst is chosen from the group comprising the salts of alkyl- claim 1 , alkylaryl claim 1 , aryl claim 1 , or arylalkylsulfonic acids claim 1 , alkyl- claim 1 , alkylaryl- claim 1 , aryl- or arylalkylphosphoric acids claim 1 , alkyl- claim 1 , alkylaryl- claim 1 , aryl- or arylalkylphosphonic acids claim 1 , and acid alkyl- claim 1 , alkylaryl- claim 1 , aryl- or arylalkylsulfates claim 1 , the said acids possibly being substituted by halogen or by oxyalkylene groups claim 1 , in particular alkyl-polyoxyalkylene claim 1 , alkylaryl polyoxyalkylene and aryl polyoxyalkylene.3. The method according to claim 2 , wherein the catalyst is chosen from among the salts of alkylsulfonic claim 2 , arylsulfonic claim 2 , alkylarylsulfonic or arylalkylsulfonic acids.4. The method according to claim 3 , wherein the catalyst is a salt of p-toluenesulfonic acid.5. The method according to claim 4 , wherein the catalyst is chosen from among the sodium claim 4 , potassium claim 4 , lithium claim 4 , calcium and magnesium salts of p-toluenesulfonic acid.6. The method according to claim 1 , wherein the catalyst is added in a quantity of 0.04% to 10 mole % relative to the number of carboxylic functions of the polycarboxylic acid.7. The method according to claim 1 , wherein the polycarboxylic acid is chosen from among the homopolymers ad copolymers of methacrylic acid and the copolymers of methacrylic acid and maleic acid or maleic anhydride.9. The method according to claim 8 , wherein the polyether is of formula HO-Q-Rin which Ris a methyl or ethyl group.10. The method according to claim 1 , wherein the polyether is of formula HO-Q-Rin which Q is of above-mentioned formula (II) claim 1 , in which:n is an integer varying from 5 ...

Dispersing polymers with improved thermal stability

The invention relates mainly to a polymer comprising a hydrocarbon-based main chain bearing carboxylic groups and polyalkoxylated chains and up to 4% by weight of antioxidant groups, relative to the weight of the final polymer, which are grafted to the main chain. It also relates to a process for preparing such a polymer and to an adjuvant which is of use as a dispersant of suspensions of mineral particles comprising same. Finally, it relates to the use of such a polymer for fluidifying suspensions of mineral particles and reducing the water demand of hydraulic compositions.

DISPERSING POLYMERS WITH IMPROVED THERMAL STABILITY

L'invention vise principalement un polymère comprenant une chaîne principale hydrocarbonée portant des groupes carboxyliques et des chaînes polyalcoxylés et jusqu'à 4% en poids de groupements anti-oxydants par rapport au poids du polymère final greffés à la chaîne principale. Elle vise également un procédé de préparation d'un tel polymère ainsi qu'un adjuvant utile à titre de dispersant de suspensions de particules minérales le comprenant. Enfin, elle vise l'utilisation d'un tel polymère pour fluidifier des suspensions de particules minérales et réduire la demande en eau de compositions hydrauliques.

VISCOSITY-REDUCING SUPER-PLASTICISING COPOLYMERS

L'invention vise principalement l'utilisation d'un (co)polymère comportant une chaîne principale composée essentiellement d'unités (méth)acryliques et des chaînes latérales de type polyoxyalkylés comprenant des unités hydrophobes distribuées de manière statistique à titre d'adjuvant afin d'abaisser la viscosité de compositions hydrauliques.

VISCOSITY-REDUCING SUPER-PLASTICISING COPOLYMERS

L'invention vise principalement l'utilisation d'un (co)polymère comportant une chaîne principale composée essentiellement d'unités (méth)acryliques et des chaînes latérales de type polyoxyalkylés comprenant des unités hydrophobes distribuées de manière statistique à titre d'adjuvant afin d'abaisser la viscosité de compositions hydrauliques.

VISCOSITY-REDUCING SUPER-PLASTICISING COPOLYMERS

The invention mainly relates to the use of a (co)polymer having a main chain essentially consisting of (meth)acrylic units and polyoxyalkylated side-chains containing statistically-distributed hydrophobic units as an adjuvant for lowering the viscosity of hydraulic compositions. 114.-. (canceled)15. Process for lowering the viscosity of hydraulic compositions , comprising the addition to the hydraulic composition of a (co)polymer comprising a main chain , essentially consisting of (meth)acrylic units , and side chains of polyoxyalkylated type containing statistically-distributed hydrophobic units as an adjuvant.16. The process according to claim 15 , wherein the main chain has a degree of polymerisation of 15 to 45.17. The process according to claim 15 , wherein the mean molecular weight of the side chains is between 500 and 5000 g/mol.18. The process according to claim 15 , wherein the weight average molecular weight of the (co)polymer is 10 000 to 50 000 g/mol.19. The process according to claim 15 , wherein:the main chain has a degree of polymerisation of 15 to 45,the mean molecular weight of the side chains is between 500 and 5000 g/mol, andthe weight average molecular weight of the (co)polymer is from 10 000 to 50 000 g/mol.20. The process of (co)polymers according to claim 15 , wherein the hydrophobic units are oxypropylene and oxybutylene groups.21. The process according to claim 20 , wherein the hydrophobic units are oxypropylene groups.24. The process according to wherein in the formulas (I) and (Ia) claim 22 , Z is an oxygen.25. The process according to wherein in the formulas (I) and (Ia) claim 22 , Ris a -Q-Rgroup in which Ris a methyl or ethyl group.26. The process according to claim 22 , wherein in formula (II) Ris a -Q-Rgroup in which n varies from 1 to 100 and m varies from 1 to 75 and q equals 0.27. The process according to claim 15 , wherein the (co)polymer dosage is adjusted so that the content of hydrophobic groups in the composition of the ...

Viscosity-reducing super-plasticising copolymers

The invention mainly relates to the use of a (co)polymer having a main chain essentially consisting of (meth)acrylic units and polyoxyalkylated side-chains containing statistically-distributed hydrophobic units as an adjuvant for lowering the viscosity of hydraulic compositions.

Dispersing polymers with improved thermal stability

The invention relates mainly to a polymer comprising a hydrocarbon-based main chain bearing carboxylic groups and polyalkoxylated chains and up to 4% by weight of anti-oxidant groups, relative to the weight of the final polymer, grafted to the main chain. It also relates to a method for preparing such a polymer and to an admixture which is of use as a plasticizer of suspensions of mineral particles comprising same. Finally, it is related to the use of such a polymer for fluidifying suspensions of mineral particles and reducing the water demand of hydraulic compositions.

Method for preparing a superplasticizer

The invention chiefly concerns a method for preparing polyalkoxylated polycarboxylates in which the following are caused to react in the presence of water and a catalyst at a temperature of between 120 and 250° C.: at least one polycarboxylic acid obtained by polymerization of at least one unsaturated carboxylic acid; and at least one polyether carrying a free hydroxyl group capable of reacting with a carboxylic function of the said polycarboxylic acid, characterized in that the catalyst is an alkaline or alkaline-earth salt of a strong protic acid.

DISPERSING POLYMERS WITH IMPROVED THERMAL STABILITY

Dispersing polymers with improved thermal stability

The invention relates mainly to a polymer comprising a hydrocarbon-based main chain bearing carboxylic groups and polyalkoxylated chains and up to 4% by weight of antioxidant groups, relative to the weight of the final polymer, which are grafted to the main chain. It also relates to a process for preparing such a polymer and to an adjuvant which is of use as a dispersant of suspensions of mineral particles comprising same. Finally, it relates to the use of such a polymer for fluidifying suspensions of mineral particles and reducing the water demand of hydraulic compositions.

Polimero que comprende una cadena principal hidrocarbonada que comprende grupos carboxilicos y cadenas polialcoxiladas, que incluye 0,01 a 4% en peso con respecto al peso del polimero final de los grupos antioxidantes injertados a la cadena principal; proceso de preparacion del polimero; adyuvante; y uso del polimero en cemento

DISPERSING POLYMERS WITH IMPROVED THERMAL STABILITY

The invention relates mainly to a polymer comprising a hydrocarbon-based main chain bearing carboxylic groups and polyalkoxylated chains and up to 4% by weight of anti-oxidant groups, relative to the weight of the final polymer, grafted to the main chain. It also relates to a method for preparing such a polymer and to an admixture which is of use as a plasticizer of suspensions of mineral particles comprising same. Finally, it is related to the use of such a polymer for fluidifying suspensions of mineral particles and reducing the water demand of hydraulic compositions. 1. A polymer comprising a main hydrocarbon chain bearing carboxylic groups and polyalkoxylated chains , comprising 0.01 to 4% by weight , based on the weight of the final polymer , of antioxidant groups grafted to the main chain.2. The polymer according to claim 1 , comprising between 0.1 and 4% by weight of antioxidant groups claim 1 , based on the weight of the polymer.3. The polymer according to claim 1 , wherein the antioxidant groups comprise an aromatic amine.5. The polymer according to claim 1 , wherein the antioxidant group is grafted to the main chain via a carboxylic group claim 1 , by means of an amide or ester bond.6. The polymer according to claim 1 , wherein the polymer has a weight average molar mass of between 1 claim 1 ,000 and 1 claim 1 ,000 claim 1 ,000 (Mw).7. The polymer according to claim 1 , as a powder.8. A method for preparing a polymer according to claim 1 , comprising the step of:(i) esterifying a polycarboxylic compound with an alkoxy polyalkoxyglycol in the presence of an antioxidant compound, which may react under conditions of the reaction with a reactive function born by the polycarboxylic compound in order to form a covalent bond between the polycarboxylic compound and the antioxidant compound.9. The method according to claim 8 , wherein the step (i) is carried out in two distinct steps:(a) the reaction mixture is first brought to a temperature comprised between 50 ...

PROCESS FOR THE PREPARATION OF SUPERPLASTIFIERS

PROCESS FOR PREPARING SUPERPLASTIFIERS

L'invention vise principalement un procédé de préparation de polycarboxylates polyalkoxylés dans lequel l'on fait réagir, en présence d'eau et d'un catalyseur, à une température comprise entre 120 et 250°C : - au moins un acide polycarboxylique obtenu par polymérisation d'au moins un acide carboxylique insaturé; et - au moins un polyéther portant un groupe hydroxyle libre capable de réagir avec une fonction carboxylique dudit acide polycarboxylique, caractérisé en ce que le catalyseur est un sel alcalin ou alcalin-terreux d'un acide protique fort. The invention is aimed primarily at a process for preparing polyalkoxylated polycarboxylates in which, in the presence of water and a catalyst, a temperature of between 120 and 250 ° C is reacted: at least one polycarboxylic acid obtained by polymerizing at least one unsaturated carboxylic acid; and at least one polyether bearing a free hydroxyl group capable of reacting with a carboxylic function of said polycarboxylic acid, characterized in that the catalyst is an alkaline or alkaline-earth salt of a strong protic acid.

DISPERSING POLYMERS WITH IMPROVED THERMAL STABILITY

Viscosity-reducing super-plasticing copolymers

Dispersing polymers with improved thermal stability.

La presente invención se refiere principalmente a un polímero que comprende grupos carboxílicos que comprenden una cadena principal hidrocarbonada y cadenas polialcoxiladas y hasta 4 % en peso de grupos antioxidantes con respecto al peso del polímero final injertado en la cadena principal. La misma se refiere igualmente un proceso de preparación de tal polímero así como un adyuvante útil en calidad de dispersante de las suspensiones de las partículas minerales que las comprenden. Finalmente, se refiere a el uso de tal polímero para fluidificar las suspensiones de las partículas minerales y reducir el requerimiento de agua de las composiciones hidráulicas.

SUPERPLASTIVE COPOLYMERS REDUCING VISCOSITY.

L'invention vise principalement l'utilisation d'un (co)polymère comportant une chaîne principale composée essentiellement d'unités (méth)acryliques et des chaînes latérales de type polyoxyalkylés comprenant des unités hydrophobes distribuées de manière statistique à titre d'adjuvant afin d'abaisser la viscosité de compositions hydrauliques. The invention is aimed primarily at the use of a (co) polymer comprising a main chain consisting essentially of (meth) acrylic units and polyoxyalkylated side chains comprising hydrophobic units randomly distributed as an adjuvant in order to to lower the viscosity of hydraulic compositions.

Dispersing polymers with improved thermal stability.

La presente invención se refiere principalmente a un polímero que comprende grupos carboxílicos que comprenden una cadena principal hidrocarbonada y cadenas polialcoxiladas y hasta 4 % en peso de grupos antioxidantes con respecto al peso del polímero final injertado en la cadena principal. La misma se refiere igualmente un proceso de preparación de tal polímero así como un adyuvante útil en calidad de dispersante de las suspensiones de las partículas minerales que las comprenden. Finalmente, se refiere a el uso de tal polímero para fluidificar las suspensiones de las partículas minerales y reducir el requerimiento de agua de las composiciones hidráulicas.