Oriented polyglycolic acid film and production process thereof
US5853639A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 18, 1997 |
| Grant date | Dec 29, 1998 |
| Priority date | — |
| Expiry date | Apr 18, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/25
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention provides an oriented polyglycolic acid film formed from a thermoplastic resin material which comprises polyglycolic acid having a repeating unit represented by the following formula (1): ##STR1## and the following physical properties: (a) the melt viscosity, .rho.* as measured at a temperature of (the melting point, Tm of the polymer+20.degree. C.) and a shear rate of 100/sec! being 500-100,000 Pa.s; PA1 (b) the melting point, Tm being at least 150.degree. C.; PA1 (c) the melt enthalpy, .DELTA.Hm being at least 20 J/g; and PA1 (d) the density being at least 1.50 g/cm.sup.3 as measured in an unoriented, crystallized form, wherein the film has tensile strength of at least 150 MPa, and production processes thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.