Multilayer container
US8097315B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 4, 2004 |
| Grant date | Jan 17, 2012 |
| Priority date | — |
| Expiry date | Aug 12, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/139
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The multilayer container of the present invention comprises an outermost layer, an innermost layer and at least one intermediate layer interposed between the outermost layer and the innermost layer. Each of the outermost and innermost layers is mainly made of a thermoplastic polyester resin A produced by polymerizing a dicarboxylic acid component comprising 80 mol % or higher of terephthalic acid with a diol component comprising 80 mol % or higher of ethylene glycol. At least one of the intermediate layers is mainly made of a mixed resin B of a polyamide resin C and a polyamide resin D in a mixing ratio of 99.5/0.5 to 80/20 by weight. The polyamide resin C is produced by polymerizing a diamine component comprising 70 mol % or higher of m-xylylenediamine with a dicarboxylic acid component comprising 70 mol % or higher of adipic acid. The polyamide resin D has a solubility index satisfying the formula (1):Sa<Sd<Sc (1)wherein each of Sa, Sb and Sd is a solubility index, calculated by Small method, of the thermoplastic polyester resin A, the polyamide resin C and the polyamide resin D. The polyamide resin D has a glass transition temperature of 130° C. or lower which is higher than th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.