Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1992-10-30
1994-10-18
Teskin, Fred
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525232, 526 93, 526141, 526337, 5263402, 524432, 524571, 5245755, 152209R, C08F 3608, C08L 900
Patent
active
053569970
ABSTRACT:
Strain crystallizable 3,4-polyisoprene having a 3,4-microstructure content which is within the range of about 65% to about 85%, a cis-1,4-microstructure content which is within the range of about 15% to about 35%, and essentially no trans-1,4-microstructure or 1,2-microstructure can be synthesized in organic solvents to quantitative yields after short polymerization times by utilizing the catalyst systems of this invention. This invention specifically discloses a process for the synthesis of 3,4-polyisoprene which comprises polymerizing isoprene monomer in an organic solvent at a temperatIre which is within the range of about -10.degree. C. to about 100.degree. C. in the presence of a catalyst system which is comprised of (a) an organoiron compound which is soluble in the organic solvent, wherein the iron in the organoiron compound is in the +3 oxidation state, (b) a partially hydrolyzed organoaluminum compound which was prepared by adding a protonic compound selected from the group consisting of water, alcohols and carboxylic acids to the organoaluminum compound, and (c) a chelating aromatic amine; wherein the molar ratio of the chelating amine to the organoiron compound is within the range of about 0.1:1 to about 1:1, wherein the molar ratio of the organoaluminum compound to the organoiron compound is within the range of about 5:1 to about 200:1, and wherein the molar ratio of the protonic compound to the organoaluminum compound is within the range of about 0,001:1 to about 0.2:1.
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Halasa Adel F.
Hsu Wen-Liang
Massie, II Johnny D.
Sandstrom Paul H.
Rockhill Alvin T.
Teskin Fred
The Goodyear Tire & Rubber Company
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