Branched copolyesters especially suitable for extrusion blow molding
US5442036A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 6, 1994 |
| Grant date | Aug 15, 1995 |
| Priority date | — |
| Expiry date | Sep 6, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/20
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed are polyester particles adapted to be extrusion blow molded into articles having improved rheological qualities and a process for producing such particles, said particles comprising a polyester having repeat units from about 40 to 100 mol % terephthalic acid, about 80-98 mol % ethylene glycol, about 0.5-10 mol % 1,4-cyclohexanedimethanol, about 3-10 mol % diethylene glycol, and about 0.05-1.0 mol % of a polyfunctional branching agent, the molecular weight gradient from core to surface of said particles satisfying the following parameters: (A) number average less than 5500, (B) weight average less than 35,000, and (C) Z average less than 110,000
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.