Preform and bottle using pet/pen blends and copolymers
US5888598A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 23, 1996 |
| Grant date | Mar 30, 1999 |
| Priority date | — |
| Expiry date | Jul 23, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to an injection molded preform comprising an open ended mouth forming portion, an intermediate body forming portion, and a closed base forming portion, wherein said preform comprises (1) a blend of (i) PEN copolymer and (ii) PET homopolymer or PET copolymer, such that when said PET and PEN components are physically mixed into a blend, said blend has about 5-70 wt %. PEN copolymer and 30 to 95 wt % PET homopolymer of copolymer therein, (2) a PEN copolymer, or (3) PEN homopolymer, and said preform having a stretch ratio in the range of 18:1 to 25:1 in order form a bottle having a volume in the range of 250 ml to 850 ml, wherein the stretch index is below 130 cm. Alternatively, said preform has a stretch ratio in the range of 18:1 to 20:1 in order to form a bottle having a volume in the range of 250 ml to 1000 ml. The invention further relates to an injection mold defining a cavity corresponding to an injection molded preform of the invention. In addition, the invention relates to a blow-molded container produced from the injection molded plastic preform described above.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.