Crystalline form of poly(ethylene 2,6-naphthalate) and a method for its production
Patent 5670606 Issued on September 23, 1997. Estimated Expiration Date: 
January 5, 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.
January 5, 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 ReferencesProcess for crystallization of polyethylene naphthalate Process for manufacture of high molecular weight polyester resins from 2,6-naphthalene dicarboxylic acid Solid state polymerization of polyesters with low diffusion resistance prepolymer granules Solid state polymerization process for foamed poly(ethylene naphthalate) Patent #: 5449701 InventorsAssigneeApplicationNo. 583365 filed on 01/05/1996US Classes:528/272, 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 thereof528/182Material is a nitrogen-containing compoundExaminersPrimary: Mosley, TerressaForeign Patent References
International ClassC08G 063/02AbstractDisclosed herein is a novel crystalline form of low molecular weight poly(ethylene 2,6-naphthalate). This crystalline form may be produced from molten or glassy low molecular weight poly(ethylene 2,6-naphthalate) material by means of rapid heat transfer to or from the material. The poly(ethylene 2,6-naphthalate) composition is suitable for use as a starting material for solid-state polymerization in order to produce polymers of higher molecular weight.Other References
Field of SearchMaterial is a nitrogen-containing compoundFrom 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 thereof Fused- or bridged-ring-containing reactant other than solely as cyclic acid anhydride group Contacting with exteriorly produced specified gaseous agent other than drying, blanket, or carrier gas Temperature maintaining, heating or cooling Aryl-containing carboxylic acid or derivative of an aryl-containing dicarboxylic acid | |
