Process for making polybutylene terephthalate (PBT) from polyethylene terephthalate (PET)

US7799836B2 · kind B2 · utility

Assignee

• Sabic Innovative Plastics B.V. · NL

Inventors

• Parminder Agarwal · Evansville, US
• Kristen Cohoon · Evansville, US
• Sandeep Dhawan · Evansville, US
• Robert R. Gallucci · Greenwood, US
• Ganesh Kannan · Saginaw, US
• Kenneth F. Miller · Mount Vernon, US
• Deepak Ramaraju · Kamatana, IN
• Gomatam Raghavan Ravi · Bengaluru, IN
• Dhaval Shah · Evansville, US

Key dates

• Filing date: Jan 24, 2007
• Grant date: Sep 21, 2010
• Expiry date: Jan 24, 2027

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02W30/62
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a process for making modified polybutylene terephthalate random copolymers from a polyethylene terephthalate component. The invention relates to a three step process in which a diol component selected from the group consisting of ethylene glycol, propylene glycol, and combinations thereof reacts with a polyethylene terephthalate component under conditions sufficient to depolymerize the polyethylene terephthalate component into a first molten mixture; and where the first molten mixture is combined with 1,4-butanediol under conditions that create a second molten mixture that is subsequently placed under subatmospheric conditions that produce the modified polybutylene terephthalate random copolymers. The invention also relates to compositions made from the process.