C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/3, 402/448
C08F 36/14 (2006.01) C08F 36/04 (2006.01) C08F 279/00 (2006.01) C08J 3/24 (2006.01)
Patent
CA 1045296
ABSTRACT OF THE DISCLOSURE The invention is concerned with a method for producing polymers which are biologically acceptable, because of their elastic properties due to a system of conjugated double bonds in their molecule, and their hydrophilic properties due to the presence of -OH groups in their molecule. This method comprises polymerizing monomers containing at least 60 mole % of dienols having 5 - 10 carbon atoms and at least one -OH group, preferably in the presence of a solvent, according to a radical mechanism or an ionic coordination mechanism, by using an azo initiator, or in the presence of a catalyst consisting of a mixture of an polyalkyl aluminium with Rh acetylacetonate, Co acetylacetonate or TiCl3, respectively, with the proviso that when the polymeri- zation is carried out according to an ionic coordination mecha- nism, the -OH groups of the dienols are previously blocked in a reversible manner by reaction with Cl-Si(CH3)3. Soluble polymers can be prepared by polymerization to a low conversion degree or by polymerization at high dilution, or in the presence of chain transfer agents such as CBr4, mercaptans, etc... Three-dimensional, cross linked polymers can be prepared by polymerization in the presence of a cross linking agen or by cross linking of the soluble polymers, especially if the polymer contains both -OH groups and double bonds.
174171
Kopecek Jindrich
Ulbrich Karel
Vacik Jiri
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