Multi-layer polyisophthalate and polyterephthalate articles and process therefor
US4643925A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1985 |
| Grant date | Feb 17, 1987 |
| Priority date | — |
| Expiry date | Apr 1, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Polyester articles, particularly bottles and cans, which have good oxygen and carbon dioxide permeability resistance are very useful for packaging foods and beverages. This invention discloses multi-layer articles which have excellent oxygen and carbon dioxide permeability resistance. These multi-layer articles have at least one layer which is made from a polyisophthalate, a polyisophthalate copolymer, a melt blend of polyethylene isophthalate with polyethylene terephthalate, or a high molecular weight polyester resin which is prepared by solid state polymerizing a polyethylene isophthalate prepolymer and a polyethylene terephthalate prepolymer simultaneously together. Such multi-layer articles also have at least one layer which is made from a polyterephthalate compound or a copolymer thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.