Dip-dyeable polycarbonate process
US6749646B2 · kind B2 · utility
12Cited by
8References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 7, 2001 |
| Grant date | Jun 15, 2004 |
| Priority date | — |
| Expiry date | Jan 26, 2022 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06P1/65131
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process for tinting of articles molded from a polymeric resin is disclosed. Preferably, the article is molded from polycarbonate and the process entails immersing the molded article in a dye bath that contains water, dye, a carrier and an optional surfactant. The carrier is a compound conforming toR1[—O—(CH2)n]mOR2  (i)wherein R1 and R2 independently denote H or C1-18 alkyl, benzyl, benzoyl or phenyl radical which may be substituted in the aromatic ring by alkyl and or halogen, preferably R1=butyl, R2=H, n is 2 or 3 and m is 2 to 35. The method is especially useful in the manufacture of tinted lenses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.