Production process for injection-molded product of polyglycolic acid
US6183679A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 2000 |
| Grant date | Feb 6, 2001 |
| Priority date | — |
| Expiry date | Feb 15, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L67/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention provides an injection-molded product of polyglycolic acid obtainable by molding a thermoplastic resin material at an injection temperature ranging from the melting point, Tm of the polymer to 255.degree. C., wherein the thermoplastic resin material comprises polyglycolic acid having a repeating unit represented by the following formula (1): ##STR1## and the following physical properties: PA1 (a) the melt viscosity, .eta.* [as measured at a temperature of (the melting point, Tm of the polymer+20.degree. C.) and a shear rate of 1,000/sec] being 30-10,000 Pa.multidot.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, and a production process thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.