Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
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.
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patent: 3838108 (1974-09-01), Hergenrother et al.
Halasa Adel Farhan
Schulz Donald Norman
The Firestone Tire & Rubber & Company
Welsh M. J.
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