Chrome-free adhesion pre-treatment for plastics
US10920321B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | May 30, 2014 |
| Grant date | Feb 16, 2021 |
| Priority date | — |
| Expiry date | Dec 7, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D5/56
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Provided are chrome-free adhesion pretreatment processes for use on a variety of reinforced or unreinforced plastics and polymers, such as polyimides, polyetherimides and polyvinylchloride. The pretreatment process can be performed in a combination of two sequential operations, which includes treating with a first solution containing nitric acid and subsequently treating with a second solution that includes sulfuric acid and periodate ions. Alternatively, the pretreatment process can be performed by treatment with a single combined composition that includes nitric acid, sulfuric acid, and periodate ions. The pretreatment processes, either done in two separate solutions, sequentially, or in one combined solution, produce an adherent surface for further metallization of the article, with adhesional values of the metal layer higher than those achieved using conventional chromic acid pretreatment processes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.