Modified PET polymers and copolymers suitable for extrusion blow molding
US4554329A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 1985 |
| Grant date | Nov 19, 1985 |
| Priority date | — |
| Expiry date | Jan 30, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/20
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
There is disclosed an improved modified polymer suitable for use in making hollow containers by conventional extrusion blow molding. It is a specific type of end-capped and branched polyethylene terephthalate polymer or copolymer. In the improvement, (a) the end-cap comprises the reacted component of a monofunctional acid having a normal boiling point or sublimation point less than above about 200.degree. C.; and (b) the monofunctional acid is an aromatic monocarboxylic acid having the formula: ##STR1## wherein: R.sub.3 and/or R.sub.5 is an alkoxy group containing from 1 to 10 carbon atoms; and, the remaining R's are hydrogen. The preferred monocarboxylic acid is m-anisic acid. The product typically contains few large gels having diameters greater than 0.1 mm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.