Silicone elastomer seals for molded plastic parts
US5589119A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 22, 1994 |
| Grant date | Dec 31, 1996 |
| Priority date | — |
| Expiry date | Dec 22, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2377/00
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A process is described for bonding a silicone elastomer seal to a molded plastic part such as a plastic electric connector. Prior to molding aromatic polyamide pellets are pretreated with an aminofunctional silicone fluid. The pretreated polymer pellets are then molded in the presence of moisture to form a molded plastic part. Molding is performed at a temperature sufficient to chemically graft the amino function of the silicone fluid to the aromatic carbonyl function of the aromatic polyamide and to form silanol groups within the aminofunctional silicone fluid. The molded plastic part is coated with an organofunctional alkoxysilane having at least one vinyl group. The coated molded plastic part is heated in the presence of moisture, converting the alkoxysilane into a siloxane polymer with vinyl and silanol groups. These silanol groups then react with the silanol groups of the aminofunctional silicone fluid. Thereafter, a liquid silicone elastomer is applied to the coated molded plastic part. The elastomer contains sufficient Si--H groups to react with vinyl groups contained in the siloxane polymer formed from the alkoxysilane. The molded plastic part is heated to form a covalent b…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.