Patent application number | Description | Published |
20080287598 | Method of preparing aramid polymers incorporating carbon nanotubes - The invention relates to a method of preparing an aramid polymer solution having carbon nanotubes dispersed therein, providing a first dispersion comprising carbon nanotubes and a carrier polymer in a first solvent; providing a first solution comprising an aromatic diamine having an electron affinity lower than that of the carrier polymer and, optionally, a second solvent; adding the first solution to the first dispersion to form a second dispersion; adding an aromatic diacid or aromatic diacid chloride to the second dispersion; polymerizing the aromatic diacid or aromatic diacid chloride with the aromatic diamine to form a carbon nanotube containing aramid polymer or co-polymer in a first aramid solution; isolating the carbon nanotube-containing aramid polymer or co-polymer; and dissolving the carbon nanotube-containing aramid polymer or co-polymer in a third solvent to form a second aramid solution. | 11-20-2008 |
20090101589 | Method for removing hydrazine compounds - Disclosed are methods for removing hydrazine compounds from solutions. Solutions containing hydrazine compounds are contacted with crosslinked polyvinylpyrrolidone. | 04-23-2009 |
20100217046 | PROCESS FOR PRODUCING 3,4' DIACETOXYBENZOPHENONE - A process for producing 3,4′diacetoxybenzophenone by first synthesizing 3,4′dihydroxybenzophenone by reacting meta-hydroxybenzoic acid and phenol in the presence of a Lewis acid, and a protonic acid followed by reacting the 3,4′dihydroxybenzophenone with an acetylating agent in the presence of an inorganic acid and activated carbon. | 08-26-2010 |
20100217047 | PROCESS FOR PRODUCING 3,4' DIHYDROXYBENZOPHENONE - A process for synthesizing 3,4′dihydroxybenzophenone by reacting meta-hydroxybenzoic acid and phenol in the presence of a Lewis acid, and a protonic acid. Upon completion of the reaction the Lewis and protonic acids are removed and then the reaction product of 3,4′dihydroxybenzophenone is contacted with water (at temperature not greater than 10° C.) and ammonium hydroxide followed by filtration. | 08-26-2010 |
20130018138 | NEUTRALIZED COPOLYMER CRUMB AND PROCESSES FOR MAKING SAME - The invention concerns copolymer crumb derived from the copolymerization of para-phenylenediamine, 5(6)-amino-2-(p-aminophenyl)benzimidazole, and terephthaloyl dichloride having an inherent viscosity of at least 3 dl/g having less than 0.4 mol/Kg of titrate-able acid. In addition, the invention concerns filaments and yarn formed from such polymer crumb and processes for forming the filaments and yarn. | 01-17-2013 |
20130190433 | PROCESS OF FORMING AN ARAMID COPOLYMER - The invention concerns processes for forming a polymer comprising residues of 2-(4-amino phenyl)-5(6)amino phenyl benzimidazole (DAPBI), paraphenylene diamine (PPD), and terephthaloyl dichloride, comprising the steps of: (a) forming a slurry of DAPBI in a solvent system comprising an organic solvent and an inorganic salt; (b) adding less than a stoichiometric amount, relative to the amount of DAPBI, of terephthaloyl dichloride to the slurry; (c) agitating the slurry to react the DAPBI and terephthaloyl dichloride to form an oligomeric solution; (d) adding PPD to the oligomeric solution and agitating until essentially all of the PPD is dissolved, followed by the addition of terephthaloyl dichloride to form a prepolymer solution; and (e) allowing the prepolymer solution to form a polymer. | 07-25-2013 |
20130197146 | PROCESS OF FORMING AN ARAMID COPOLYMER - The invention concerns processes for forming a polymer comprising residues of 2-(4-amino phenyl)-5 (6) amino phenyl benzimidazole (DAPBI), paraphenylene diamine, and terephthaloyl dichloride, comprising the steps of: a) forming a solution of DAPBI and paraphenylene diamine dihydrochloride in a solvent system comprising an organic solvent and an inorganic salt; b) cooling the solution to a temperature of 30° C. or less; c) adding a stoichiometric amount of terephthaloyl dichloride, relative to the total amount of the DAPBI and the paraphenylene diamine dihydrochloride, to the solution; and d) agitating the solution of step c) to form a polymer. | 08-01-2013 |
20130197148 | PROCESS FOR FORMING AN ARAMID COPOLYMER - The invention concerns processes for forming a polymer comprising residues of 2-(4-amino phenyl)-5(6)amino phenyl benzimidazole (DAPBI), paraphenylene diamine, and terephthaloyl dichloride, the process comprising: (a) forming a solution of oligomers having chloride end groups from one mole of paraphenylene diamine and 1.3 to 5 moles of terephthaloyl dichloride a solvent system comprising an organic solvent and an inorganic salt; and (b) adding DAPBI and terephthaloyl dichloride to the solution of oligomers to form a polymer. | 08-01-2013 |
20130197184 | PROCESS FOR PREPARING ARAMID COPOLYMER - The invention concerns processes for forming a polymer comprising residues of 2-(4-amino phenyl)-5(6)amino phenyl benzimidazole (DAPBI), paraphenylene diamine, and terephthaloyl dichloride, comprising the steps of: (a) forming a slurry of DAPBI and paraphenylene diamine in a solvent system comprising an organic solvent and an inorganic salt; and (b) adding a stoichiometric amount of terephthaloyl dichloride to the slurry in a single addition and allowing the formation of the polymer. | 08-01-2013 |
20130203906 | PROCESS FOR PREPARING ARAMID COPOLYMER - The invention concerns processes for forming a polymer comprising residues of terephthaloyl chloride, paraphenylene diamine, and a salt of formula I | 08-08-2013 |
20130203955 | PROCESS FOR FORMING AN ARAMID COPOLYMER - The invention concerns processes for forming a polymer comprising residues of 2-(4-amino phenyl)-5(6) amino phenyl benzimidazole (DAPBI), paraphenylene diamine (PPD), and terephthaloyl dichloride, comprising the steps of: (a) forming a slurry of DAPBI in a solvent system comprising an organic solvent and an inorganic salt; (b) adding terephthaloyl dichloride to the slurry terephthaloyl dichloride in the amount of up to one-half mole for every mole of DAPBI in the slurry; (c) agitating the slurry to react the DAPBI and terephthaloyl dichloride to form an oligomeric solution; (d) adding PPD to the oligomeric solution and agitating until substantially all of the PPD is dissolved, (e) adding terephthaloyl dichloride in an amount of greater than one mole for every mole of PPD in the solution to form a prepolymer solution; and (e) agitating the prepolymer solution to form a polymer. | 08-08-2013 |
20130203956 | ARAMID COPOLYMER - The invention concerns polymer comprising residues of 2-(4-amino phenyl)-5 (6) amino phenyl benzimidazole (DAPBI), paraphenylene diamine, and terephthaloyl dichloride, the polymer having a IPC peak block ratio of 1.45 to 1.47 and an inherent viscosity of greater than 2 dl/g. | 08-08-2013 |
20130203957 | ARAMID COPOLYMER - The invention concerns polymer comprising 2-(4-amino phenyl)-5 (6) amino phenyl benzimidazole (DAPBI), PPD, and terephthaloyl dichloride, the polymer having a IPC peak block ratio of 1.52 to 1.56 and an inherent viscosity of greater than 2 dl/g. | 08-08-2013 |
20130261239 | PROCESS FOR FORMING AN ARAMID COPOLYMER - The invention concerns processes for forming a polymer comprising residues of 2-(4-amino phenyl)-5(6) amino phenyl benzimidazole (DAPBI), paraphenylene diamine (PPD), and terephthaloyl dichloride, comprising the steps of: (a) forming a solution of oligomers having amine end groups from two moles of DAPBI and one mole of terephthaloyl dichloride in a solvent system comprising an organic solvent and an inorganic salt; (b) adding PPD to the solution of oligomers; and (c) adding additional terephthaloyl dichloride to form a polymer. | 10-03-2013 |
20130261258 | ARAMID COPOLYMER - The invention concerns polymer powder comprising 2-(4-amino phenyl)-5(6) amino phenyl benzimidazole (DAPBI), paraphenylene diamine, and terephthaloyl dichloride, capable of being dissolved in a solvent system comprising (i) N-methyl-2-pyrrolidone (NMP) or dimethylacetamide (DMAC) and (ii) an inorganic salt; wherein said polymer is capable of being redissolved in said solvent system after said polymer has been removed from said solvent system. | 10-03-2013 |