Method of making silicone copolycarbonates having random and blocky substructures
US6780956B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 2, 2002 |
| Grant date | Aug 24, 2004 |
| Priority date | — |
| Expiry date | Oct 2, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/2535
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention relates to a method of preparing silicone copolycarbonates which incorporate both blocky and random substructures. Such silicone-containing copolycarbonates are useful in the preparation of a variety of molded articles such as optical disks. The structure of the compositions prepared by the method of the invention is determined by the method of preparation used and may be used to control physical properties. The copolymers are prepared by forming in a first step an intermediate silicone copolycarbonate possessing either a blocky or random structure and reactive endgroups, and then appending additional structural in a second step which is complimentary to the first step and produces a product silicone copolycarbonate having both random and blocky substructures. The repeat units I and II appended in the second step may be the same or different as those repeat units I and II incorporated in the first step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.