Extrusion grade polyethylene iso/terephthalate copolymer
US4234708A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1979 |
| Grant date | Nov 18, 1980 |
| Priority date | — |
| Expiry date | Apr 23, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/20
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process is disclosed for producing a modified polyethylene iso-terephthalate copolymer which may be processed into plastic containers using conventional extrusion blow molding equipment. The copolymer is modified by the incorporation into a polyethylene iso/terephthalate prepolymer of a chain branching agent and a chain terminating agent. The prepolymer is subsequently solid-state polymerized to form a polyethylene iso/terephthalate copolymer having high zero shear rate melt viscosity and shear sensitivity. This modified copolymer is transparent when extrusion blow molded into a shaped article. The modified copolymer may be extrusion blow molded in intermittent and continuous processes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.