PROPYLENE POLYMER

• Main Authors: HINGMANN ROLAND DR, HUEFFER STEPHAN DR, LILGE DIETER DR, LANGHAUSER FRANZ DR, ROESCH JOACHIM DR
• Format: Patent
• Language: English
• Published: 26.03.1999
• Edition: 6
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS; CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; NATURAL OR ARTIFICIAL THREADS OR FIBRES; ORGANIC MACROMOLECULAR COMPOUNDS; SPINNING; TEXTILES; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

PROBLEM TO BE SOLVED: To provide a propylene polymer which has a high rigidity/strength ratio and low chlorine content, and can be produced by a process with high productivity. SOLUTION: A propylene polymer containing a matrix comprising a propylene homopolymer and a copolymer of propylene with other alkene is first dissolved in boiling xylene, the solution is cooled at a cooling rate of 10 deg.C per hr to 25 deg.C, the temperature is then raised to separate the propylene polymer into fractions of various solubilities according to the stereoregularities of polymer chains and the comonomer distributions, wherein the matrix remaining undissolved when the cooled propylene polymer solution is heated to 80 deg.C satisfies one or more of the following conditions: i) the matrix remains undissolved in an amount above 20 wt.% when further heated to 112 deg.C; ii) it remains undissolved in an amount above 8 wt.% when further heated to 117 deg.C; and iii) it remains undissolved in an amount above 1 wt.% when further heated to 122 deg.C.