Molded soft elastomer/hard polyester composition with noise damping properties
US6849684B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 2001 |
| Grant date | Feb 1, 2005 |
| Priority date | — |
| Expiry date | Jun 23, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/0001
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention provides a molded composition having improved noise damping properties, made of a blend of a soft thermoplastic polyether elastomer and a hard polyester resin reinforced with a fibrous or particulate filler, the molded composition having an inhomogeneous structure comprising a surface part which is rich in elastomer and depleted in the polyester resin and the reinforcing filler compared to its inner part, obtained by monocomponent injection molding of a blend of the soft and the hard polyester resin wherein only the polyester resin contains the reinforcing particulate filler. The molded composition has a flex modulus Fm in the range 0.5 to 10 GPa, and maintains a sufficient minimum tan delta damping factor t_ over a temperature range of −50° C. to 170° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.