Claims
- 1. A copolymer resin comprising structural units derived from ##STR3## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 independently are C.sub.1 -C.sub.4 alkyl, chlorine or bromine and n.sub.1, n.sub.2, n.sub.3 and n.sub.4 independently are 0, 1 or 2, said polymer selected from the group consisting of polyurethane, polyester, polysulfone and polyether.
Parent Case Info
This application is a division of application Ser. No. 383,893 filed June 1, 1982, now U.S. Pat. No. 4,463,163.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4463163 |
Krishnan et al. |
Jul 1984 |
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Divisions (1)
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Number |
Date |
Country |
Parent |
383893 |
Jun 1982 |
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