Patent application number | Description | Published |
20090032768 | WATER-SOLUBLE PHENYLENEDIAMINE COMPOSITIONS AND METHODS FOR STABILIZING ETHYLENICALLY UNSATURATED COMPOUNDS AND MONOMERS - Compositions and methods for inhibiting polymerization of ethylenically unsaturated monomers are provided. The compositions include a water-soluble phenylenediamine composition. | 02-05-2009 |
20100258480 | PROCESSES FOR INHIBITING FOULDING IN HYDROCARBON PROCESSING - A method for inhibiting the formation of fouling materials including contacting hydrocarbon media containing carbonyl compounds with hydroxylamine and naphthalene sulfonate while treating the hydrocarbon media with a basic wash. | 10-14-2010 |
20110297878 | METHODS AND COMPOSITIONS FOR INHIBITING VINYL AROMATIC MONOMER POLYMERIZATION - Methods and compositions are provided for inhibiting the polymerization of a vinyl aromatic monomer, such as styrene monomer, during elevated temperature processing thereof or during storage or shipment of polymer containing product. The compositions comprise a combination of a quinone methide derivative A) and a phenol compound B). The methods comprise adding from about 1-10,000 ppm of the combination to the monomer containing medium, per one million parts of the monomer. | 12-08-2011 |
20120217444 | COMPOSITION AND METHOD FOR INHIBITING PREMATURE POLYMERIZATION - The invention relates to composition comprising: at least one free radical polymerizable vinyl compound; and an active amount of inhibition composition comprising metal ions, halogen ions and a ligand having a donor atom selected from oxygen, nitrogen, sulfur, phosphorus and a combination thereof, the metal ions being selected from ions of Ti, Mo, Re, Ru, Fe, Rh, Ni, Pd, Co, Os, Cu and any combination thereof; wherein the composition is free of a nitroxyl compound of a secondary amine having no hydrogen atom on α-C atom. A method for inhibiting the premature polymerization of at least one free radical polymerizable vinyl compound, comprising: adding an active amount of the inhibition composition to the at least one free radical polymerizable vinyl compound. | 08-30-2012 |
20130030225 | METHODS AND COMPOSITIONS FOR INHIBITING VINYL AROMATIC MONOMER POLYMERIZATION - Methods and compositions are provided for inhibiting the polymerization of a vinyl aromatic monomer, such as styrene monomer, during elevated temperature processing thereof or during storage or shipment of polymer containing product. The compositions comprise a combination of a quinone methide derivative A) and a phenol compound B). The methods comprise adding from about 1-10,000 ppm of the combination to the monomer containing medium, per one million parts of the monomer. | 01-31-2013 |
20130072729 | METHODS AND COMPOSITIONS FOR INHIBITING POLYSTYRENE FORMATION DURING STYRENE PRODUCTION - Methods and compositions are provided for inhibiting the polymerization of a vinyl aromatic monomer, such as styrene monomer, during elevated temperature processing or distillation thereof. The compositions comprise an inhibitor combination of (A) a hydroxylamine and (B) a stable free radical plus a retarder that is either; (C) dinitrobutylphenol or (D) quinone methide. The ratio of (A) to (B) ranges from about 5% (A) to 95% (B) to about 95% (A) to about 5% (B). The compositions are added to the vinyl aromatic monomer in amounts sufficient to prevent polymerization during the distillation process. Typically the inhibitor combination is added to the vinyl aromatic monomer in an amount ranging from about 10 to 150 ppm of the monomer. Retarders are typically added in an amount ranging from 50 to 1500 ppm of the vinyl aromatic monomer. | 03-21-2013 |
20130204053 | METHODS AND COMPOSITIONS FOR STYRENE INHIBITION VIA IN SITU GENERATION OF QUINONE METHIDES - Methods and compositions are provided for inhibiting the polymerization of a vinyl aromatic monomer, such as styrene monomer, during elevated temperature processing or distillation thereof or during storage or shipment of polymer containing product. The compositions include a combination of a hydroxybenzyl alcohol (1) and a dehydration catalyst (2). The combination is added to a vinyl aromatic monomer. Typically, the hydroxybenzyl alcohol is dehydrated in the styrene solution by the use of a strong acid catalyst acting as the dehydration catalyst, and the resultant reaction product is a quinone methide styrene inhibitor. | 08-08-2013 |
20160052840 | METHODS AND COMPOSITIONS FOR INHIBITING POLYSTYRENE FORMATION DURING STYRENE PRODUCTION - Methods and compositions are provided for inhibiting the polymerization of a vinyl aromatic monomer, such as styrene monomer, during elevated temperature processing or distillation thereof. The compositions comprise an inhibitor combination of (A) a hydroxylamine and (B) a stable free radical plus a retarder that is either; (C) dinitrobutylphenol or (D) quinone methide. The ratio of (A) to (B) ranges from about 5% (A) to 95% (B) to about 95% (A) to about 5% (B). The compositions are added to the vinyl aromatic monomer in amounts sufficient to prevent polymerization during the distillation process. Typically the inhibitor combination is added to the vinyl aromatic monomer in an amount ranging from about 10 to 150 ppm of the monomer. Retarders are typically added in an amount ranging from 50 to 1500 ppm of the vinyl aromatic monomer. | 02-25-2016 |