Claims
- 1. A process for the preparation of a linear N-vinylpyrrolid-2-one polymer of increased molecular weight and which contains ester groups or urethane groups as bridge members wherein (1) a poly-N-vinylpyrrolidone obtained by a process in which a polymer obtained by the free radical polymerization of N-vinylpyrrolid-2-one in the presence of hydrogen peroxide as the free radical initiator is treated with a complex hydride to form a polymer having two identical reactive end groups is cooled and then reacted with (2) a bifunctional compound which contains reactive groups and which is selected from the group consisting of phosgene, oxalyl chloride, malonyl chloride, succinyl chloride, glutaric acid dichloride, sebacic acid dichloride, phthalic acid dichloride, terephthalic acid dichloride, toluylene diisocyanate, hexamthylene diisocyanate and methylene-bis-cyclohexyl diisocyanate.
- 2. The process of claim 1 wherein the identical reactive end groups are hydroxy groups.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2831355 |
Jul 1978 |
DEX |
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Parent Case Info
This is a division of application Ser. No. 56,136, filed July 9, 1979.
US Referenced Citations (4)
Foreign Referenced Citations (1)
Number |
Date |
Country |
1541670 |
Mar 1979 |
GBX |
Divisions (1)
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Number |
Date |
Country |
Parent |
56136 |
Jul 1979 |
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