Methods for molding composite polyester articles having rigid and flexible regions
US5354532A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 1991 |
| Grant date | Oct 11, 1994 |
| Priority date | — |
| Expiry date | Sep 10, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2367/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Composite molded articles having relatively rigid and flexible resin regions are bonded to one another along an interfacial fusion zone. A normally solid thermoplastic polyalkylene terephthalate resin preform (which will constitute the relatively rigid region of the composite article) is placed in a mold cavity. The flexible region of the composite article is then formed by introducing a molten thermoplastic polyester elastomer resin into the mold cavity at a temperature which is greater than the melt temperature of the solid preform. The introduced thermoplastic polyester elastomer resin contacts and at least partially plasticizes a surface region of the solid preform along the interfacial bonding zone within the mold cavity to thereby cause the polyester elastomer resin to coalesce with the at least partially plasticized surface region of the polyester resin. Upon cooling and solidification, the solid preform and the polyester elastomer are fused to one another along the interfacial bonding zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.