Alkali metal aliphatic and aromatic hydrocarbon acetals and keta

Details Alkali metal aliphatic and aromatic hydrocarbon acetals and keta Alkali metal aliphatic and aromatic hydrocarbon acetals and keta

1974-08-19

1977-10-04

Welsh, M. J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

526 20, 526 21, 526 22, C08G 1862

Patent

active

040523705

ABSTRACT:
Alkali metal aliphatic and aromatic hydrocarbon acetals and ketals are initiators for the polymerization of conjugated dienes and copolymerization of conjugated diene and vinyl monomers. Mono-acetal and mono-ketal polymers are produced by termination of the foregoing polymers and copolymers with methanol, isopropanol, etc.; diacetal and diketal polymers are produced by terminating said polymers and copolymers with a joining agent, e.g. Cl.sub.2 Si(CH.sub.3).sub.2 ; and polyacetal and polyketal polymers and copolymers are produced by terminating said polymers and copolymers with a polyfunctional joining agent, e.g. Cl.sub.3 SiCH.sub.3. Other mono-acetal and mono-ketal polymers are prepared by terminating said polymers and copolymers with ethylene oxide or carbon dioxide. The terminally reactive acetal polymers can be converted to other useful polymeric products. For example, terminal primary hydroxy polymers are produced by hydrolyzing the foregoing acetal and ketal polymers and copolymers with dichloroacetic acid catalyst in toluene:water mixtures.
Terminal monohydroxy polymers are produced by hydrolyzing polymers and copolymers terminated at one end with an acetal or ketal group. Terminal dihydroxy polymers are produced by (a) hydrolyzing polymers and copolymers terminated at one end by an acetal or ketal group and with a hydroxy group at the other terminal or (b) by hydrolyzing diacetal or diketal polymers. Terminal trihydroxy (polyhydroxy) polymers are formed by hydrolyzing triacetal or triketal (polyacetal or polyketal) polymers. Hydrolyzed acetal or ketal polymers (especially di- and trifunctional) are converted by suitable chain-extension processes (e.g. by polymerization or copolymerization) to give sulfur-curable elastomers.

REFERENCES:
patent: 3041312 (1962-06-01), Boyd
patent: 3254062 (1966-05-01), Forman
patent: 3410836 (1968-11-01), Hsieh et al.
patent: 3580895 (1971-05-01), Onishi et al.
patent: 3674743 (1972-07-01), Verdol et al.
patent: 3838108 (1974-09-01), Hergenrother et al.

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