The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 30, 2019
Filed:
Apr. 30, 2015
Resinate Materials Group, Inc., Plymouth, MI (US);
Rick Tabor, Plymouth, MI (US);
Eric D. Vrabel, Ferndale, MI (US);
Kevin Anthony Rogers, Farmington, MI (US);
Shakti L. Mukerjee, Canton, MI (US);
Matthew J. Beatty, Ann Arbor, MI (US);
Adam William Emerson, Ypsilanti, MI (US);
Matthew T. Brown, Novi, MI (US);
Jack Rogers Kovsky, Detroit, MI (US);
Michael D. Kellerman, Ann Arbor, MI (US);
Michael Robert Christy, Howell, MI (US);
RESINATE MATERIALS GROUP, INC., Plymouth, MI (US);
Abstract
Polyester polyols made from recycled polyethylene terephthalate (rPET) and processes for making them are disclosed. The rPET is heated with a C-Cglycol reactant to give a digested intermediate comprising glycols and a terephthalate component, which comprises 45 to 70 wt. % of bis(hydroxyalkyl)terephthalates, and preferably lesser amounts of terephthalate dimers and trimers. Treatment of the digested intermediate with activated carbon gives a polyester polyol having a color index less than 20. The polyols have desirable hydroxyl numbers, viscosities, appearance, and other attributes for formulating polyurethane products and are a sustainable alternative to bio- or petrochemical-based polyols.