Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1975-09-18
1977-06-07
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526175, 526340, C08F13606, C08F23606
Patent
active
040284840
ABSTRACT:
The effectiveness of an alfin catalyst and the quality of the rubber it produces are increased by carrying out the polymerization in a closed container in which the ratio of vapor to liquid space is less than 0.2, this ratio being responsible for a reduction of the boiling (desorption of monomer) that occurs on each particle because of the heat of polymerization. In general the effectiveness of the catalyst and the quality of the polymer are improved by any method or combination of methods that reduces the boiling per particle to a level less than that achieved by carrying out the reaction in a closed container in which the volume of vapor space to liquid is less than 0.2. The more this reduction, the better the product as a rule.
The product obtained is a millable rubber of high molecular weight, well above that of natural rubber and primarily with a trans structure of the diene component. This fact was demonstrated with a styrene:butadiene proportion of around 30:70, polymerized under a combination of influences that restrained boiling. The polymer compounded readily, that is to say, the rubber banded on a warm mill and compounded easily in a conventional recipe. Rubbers with an intrinsic viscosity near 13, having a high proportion of the diene in a trans structure, when compounded had a tensile-elongation of around 260 Kg/cm.sup.2 -500%.
This unique achievement is possible because the polymerization is in an heterogeneous system, where adsorption on a solid surface and deposit of the product thereon dominate the reaction. The situation contrasts with conventional polymerizations in homogeneous systems where solution is a major factor.
REFERENCES:
patent: 3197448 (1965-07-01), Gavlin
patent: 3418297 (1968-12-01), Grinninger
patent: 3422080 (1969-01-01), Hedman
patent: 3449469 (1969-06-01), Maringer
patent: 3518238 (1970-06-01), Onishi
patent: 3649606 (1972-03-01), Watson
patent: 3718637 (1973-02-01), Halasa
patent: 3728323 (1973-04-01), Cheng
patent: 3868344 (1975-02-01), Newberg
Lanpher Edward J.
Morton Avery A.
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