Leaching contaminants from post-consumer for reuse in food-contact applications
December 23, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3806316 Fabric dye stripping, separation and recovery of polyester Polyester polymer recovery from dyed polyester fabrics Polyester polymer recovery Process for the continuous production of high molecular weight polyethylene terephthalate Fabric dye stripping, separation and recovery of polyester Polyester polymer recovery from dyed polyester fibers Process for the extraction of contaminants from plastics Method for the reduction of impurities in polyester resins Method for recycling polyethylene terephthalate (PET) beverage bottles by treating with carbon dioxide Patent #: 5073203 InventorsAssigneeApplicationNo. 772236 filed on 12/23/1996US Classes:521/48.5, Treating with alcohol8/141, Waste reclaiming and conditioning528/272, From di- or higher ester of a polycarboxylic acid as sole reactant, or from a polycarboxylic acid or derivative with a compound containing two or more hydroxyl groups or salts thereof528/302, Two or more carboxylic acid or derivatives or mixtures thereof528/308, Aryl-containing carboxylic acid or derivative of an aryl-containing dicarboxylic acid528/308.6, Contains terephthalic acid or substituted forms thereof528/481, Treating at O Deg C (32 Deg F) or below, or at 200 Deg C (392 Deg F) or above528/493, Aldehyde or ketone528/495, Alcohol528/503Temperature maintaining, heating or coolingExaminersPrimary: Acquah, Samuel A.Attorney, Agent or FirmInternational ClassC08J 011/04AbstractA novel technique to treat post-consumer polyester for reuse in food-contact applications is described. The process comprises contacting contaminated post consumer polyester flake with at least one extraction solvent which is soluble in said contaminated flake at a temperature sufficient to allow rapid diffusion of contaminants from said polyester flake; and removing said extraction solvent containing said contaminants from said polyester flake.Other References
Field of SearchFrom di- or higher ester of a polycarboxylic acid as sole reactant, or from a polycarboxylic acid or derivative with a compound containing two or more hydroxyl groups or salts thereofTwo or more carboxylic acid or derivatives or mixtures thereof Aryl-containing carboxylic acid or derivative of an aryl-containing dicarboxylic acid Physically after-treated solid polymer Contains terephthalic acid or substituted forms thereof Treating at O Deg C (32 Deg F) or below, or at 200 Deg C (392 Deg F) or above Aldehyde or ketone Alcohol Temperature maintaining, heating or cooling Treating with alcohol Waste reclaiming and conditioning | |
