Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Montedison SpA
Original Assignee
Montedison SpA
Montecatini Societa Generale per lIndustria Mineraria e Chimica SpA
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Filing date
Publication date
Application filed by Montedison SpA, Montecatini Societa Generale per lIndustria Mineraria e Chimica SpAfiledCriticalMontedison SpA
Priority to ES0245572ApriorityCriticalpatent/ES245572A1/en
Publication of ES245572A1publicationCriticalpatent/ES245572A1/en
Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications
(AREA)
Abstract
Method for purifying solid olefinic polymers obtained under reduced pressures in the presence of a hydrocarbon medium, with the help of catalysts containing metal derivatives, characterized in that the polymer, immediately after the removal of the hydrocarbon medium, is essentially subjected to the action of an organic solvent having a swelling action on the portion of crystallizable polymer and high molecular weight and a solvent action on the other polymer fractions present in the polymerized mass to the secondary action of a mineral acid in which the inorganic impurity are soluble, to one or more washing treatments with liquids capable of completely eliminating the mineral acid already dried by vacuum heating. (Machine-translation by Google Translate, not legally binding)
ES0245572A1958-11-261958-11-26Method for purifying solid olefinal polymers (Machine-translation by Google Translate, not legally binding)
ExpiredES245572A1
(en)
Procedure for the preparation of polyesters of high molecular weight, by formaldehyde polymeration (Machine-translation by Google Translate, not legally binding)
Procedure for the preparation of polyesters of molecular weight elevated by formaldehyde polymerization (Machine-translation by Google Translate, not legally binding)
Process for regulating the molecular weight of poly-α-olefins by polymerizing olefins having 2-4 carbon atoms according to the Ziegler low pressure method.