Claims
- 1. A polymer having an average molecular weight M.sub.w (weight average) of 5,000 to 1,000,000 (measured by gel permeation chromatography), comprising structural repeating units of the formulae I-IV: ##STR6## in which R.sub.1, R.sub.2, R.sub.3 and R.sub.4 independently of one another are hydrogen, methyl or halogen, R.sub.5 and R.sub.6 independently of one another are C.sub.1 -C.sub.6 alkyl, R.sub.7, R.sub.8, R.sub.9 and R.sub.10 independently of one another are hydrogen, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy or halogen, and w, x, y and z are numbers equal to or greater than 1, with the provision that the quotient ##EQU2## which is obtainable from the sum of the structural units having protecting groups divided by the sum of all of the structural units present, obeys the condition 0.10.ltoreq.Q.ltoreq.0.50.
- 2. A polymer according to claim 1, comprising structural repeating units of the formulae V-VIII: ##STR7## in which R.sub.1 to R.sub.10, w, x, y and z are as defined in claim 1.
- 3. A polymer according to claim 1, in which the quotient Q obeys 0.15.ltoreq.Q.ltoreq.0.45.
- 4. A polymer according to claim 1, in which R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are hydrogen.
- 5. A polymer according to claim 1, in which R.sub.7, R.sub.8, R.sub.9 and R.sub.10 are hydrogen.
- 6. A polymer according to claim 1, in which R.sub.5 and R.sub.6 independently of one another are methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl or tert-butyl.
- 7. A polymer according to claim 1, in which R.sub.5 and R.sub.6 are ethyl or tert-butyl.
- 8. A polymer according to claim 1, comprising, based on the total number of all structural units, 1-40% of structural units of the formulae III and IV and 60-99% of structural units of the formulae I and II.
- 9. A polymer according to claim 1, comprising, based on the total number of all structural units, 2-15% of structural units of the formulae III and IV and 85-98% of structural units of the formulae I and II.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3835/94 |
Dec 1994 |
CHX |
|
Parent Case Info
This is a division of application Ser. No. 08/806,590 filed Feb. 26, 1997 now U.S. Pat. No. 5,928,818, which is a continuation of application Ser. No. 08/572,340 filed Dec. 14, 1995 now abandoned.
US Referenced Citations (5)
Foreign Referenced Citations (8)
Number |
Date |
Country |
0 342498 A3 |
Nov 1989 |
EPX |
0 520642 A1 |
Dec 1992 |
EPX |
0 552548 A1 |
Jul 1993 |
EPX |
0 588544 A2 |
Mar 1994 |
EPX |
0 628876 A1 |
Dec 1994 |
EPX |
42 28 269 A1 |
Mar 1993 |
DEX |
44 10 441 A1 |
Mar 1994 |
DEX |
2161436 |
Jun 1990 |
JPX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
806590 |
Feb 1997 |
|
Continuations (1)
|
Number |
Date |
Country |
Parent |
572340 |
Dec 1995 |
|