Polymerizable siloxane macromonomers
US5981615A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Mar 9, 1998 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | Mar 9, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/043
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A macromonomer of the formula I is described: EQU Q--B(L--B).sub.n T (I) wherein n is zero or at least 1.0; PA1 Q is a polymerizable group; PA1 B may be the same or different and is a difunctional block of molecular weight in the range of from 100 to 8000 and wherein at least one B is a residue from a difunctional polymer or copolymer wherein B has a molecular weight of 248 to 8000 comprising silicone repeat units of formula II ##STR1## where R.sub.1 and R.sub.2 may be the same or different and are selected from the group consisting of hydrogen, alkyl, alkenyl, alkynyl, aryl, haloalkyl, haloalkenyl, haloalkynyl, haloaryl, heterocyclyl and haloheterocyclyl; PA1 L is a difunctional linking group; and PA1 T is a terminal group. The macromonomer may be used preferably in the production of contact lenses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.