Polyols from scrap polyethylene terephthalate and dimethyl terephthalate process residue
June 18, 2006. 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 3647759 Polyisocyanate prepolymers from scrap polyester and polyurethane foam products obtained therefrom Rigid polyurethane foam containing polyester residue digestion product and building panel made therefrom Reaction products of DMT process residue and dipropylene glycol Polymeric foams from transesterified by-product derived from manufacture of dimethyl terephthalate and laminates therefrom Aromatic polyols made from recycled polyethylene terephthalate waste streams, alkylene glycol and dibasic acid waste streams Packaging foam polyurethane composition employing novel polyol blend Aromatic polyols made from waste streams from the manufacture of terephthalic acids, alkylene glycols and dibasic acids Aromatic polyols made from alkylene glycols and waste streams from the manufacture of dimethyl terephthalate containing methyl p-formylbenzoate Liquid terephthalic ester polyols and polyisocyanurate foams therefrom InventorAssigneeApplicationNo. 06/875831 filed on 06/18/1986US Classes:560/91, Polyoxyalkylene alcohol moiety252/182.25, Three or more reactants containing plural hydroxyl groups252/182.27, Reactant contains ether linkage252/182.28, Reactant contains carboxylic acid group or derivative thereof521/131, Ingredient contains only carbon and hydrogen atoms, only C and halogen atoms, or only C, H, and halogen atoms521/159, N=C=X reactant having at least two C-NH-C(=X)- groups, e.g., prepolymers, etc.521/172, -XH reactant contains a C=X group, e.g., carboxylic acid ester, etc.521/173, With non -C=X containing reactant560/89, Polyoxy alcohol moiety560/92Preparing esters by ester interchangeExaminersPrimary: Mars, Howard T.Assistant: Clarke, Vera C. Attorney, Agent or FirmInternational ClassesC07C 69/00 (20060101)C07C 69/82 (20060101) AbstractDisclosed is a mixture of terephthalic acid ester polyols for use in the preparation of rigid polyurethane and polyisocyanurate foams. The polyols are prepared by reacting scrap polyethylene terephthalate, dimethyl terephthalate process residue and an excess of a mixture of glycols. |
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