Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1980-11-06
1984-03-27
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
5253789, 525378, 525379, 525383, 525384, C08F 812
Patent
active
044395884
ABSTRACT:
The invention relates to polymers and copolymers of pivaloyloxyalkyl methacrylates which contain structural units of the general formula ##STR1## where R.sup.1 is (CH.sub.2).sub.n.sbsb.1 --O (n.sub.1 =2 to 10) or (CH.sub.2 CH.sub.2 --O).sub.n.sbsb.2 (n.sub.2 =1 to 4) and to the method of their preparation and modification. The polymerization and copolymerization can be initiated by free-radical initiators of the peroxy type or by anionic initiators, e.g., alkali metal alkoxides or butyllithium, and carried out in a solution, bulk or suspension process in the presence of a crosslinking agent or without it. Anionic polymerization may result in stereoregular polymers or may be used for preparation of block copolymers by the "living" polymer technique. The polymers and copolymers can be modified by the partial or total conversion of the pivaloyloxyalkyl methacrylate units into hydroxyalkyl methacrylate units by selective hydrolysis, alcoholysis or other reaction.
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Holata Jan
Sevcik Stanislav
Stamberg Jiri
Trekoval Jiri
Ceskoslovenska akademie ved.
Lipman Bernard
Schaffer Murray
Schofer Joseph L.
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