Abstract: A process for producing high quality TPA suitable for PET feedstock material from recycled polyester. The process includes the steps of depolymerizing the polyester to form DMT; separating the DMT from secondary materials; and hydrolyzing the DMT to form TPA. In a preferred embodiment of the invention the recycled polyester is contacted with a component monomer or oligomer thereof to liquefy the polyester prior to depolymerizing the polyester.
Type:
Grant
Filed:
November 12, 1999
Date of Patent:
October 29, 2002
Assignee:
Eastman Chemical Company
Inventors:
Thomas Michael Pell, Jr., Michael Paul Ekart, David Dunlap Cornell, Damon Brian Shackelford, Donald Lee Carver
Abstract: Curable epoxy resin composition comprising a bisphenol based epoxy resin having between 1.1 and 2.5 epoxy groups on average per molecule, a polyhydric phenol curing agent having more than two phenolic hydroxyl groups on average per molecule and red phosphorus. Also are described a process for the production of such curable epoxy resin compositions, the use of the compositions, especially in the impregnation of fibrous fibers, and products comprising or coated by the partly cured or cured epoxy resin compositions, especially impregnated fibrous fibers and laminates made therefrom.
Type:
Grant
Filed:
September 24, 1997
Date of Patent:
January 12, 1999
Assignee:
Shell Oil Company
Inventors:
Maria Julia Jozef Bruynseels, Malte Homann