GB874761A - Process for the production of a porous body of polypropylene - Google Patents

Process for the production of a porous body of polypropylene

Info

Publication number
GB874761A
GB874761A GB33492/57A GB3349257A GB874761A GB 874761 A GB874761 A GB 874761A GB 33492/57 A GB33492/57 A GB 33492/57A GB 3349257 A GB3349257 A GB 3349257A GB 874761 A GB874761 A GB 874761A
Authority
GB
United Kingdom
Prior art keywords
polypropylene
sintering
extraction
pressure
sintered
Prior art date
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.)
Expired
Application number
GB33492/57A
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.)
Ruhrchemie AG
Original Assignee
Ruhrchemie AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ruhrchemie AG filed Critical Ruhrchemie AG
Publication of GB874761A publication Critical patent/GB874761A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/24—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by surface fusion and bonding of particles to form voids, e.g. sintering

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

A process for the production of a porous body of polypropylene comprises subjecting polypropylene to solvent extraction and thereafter sintering the polypropylene. The extraction can be effected in separate steps with at least two different solvents, e.g. acetone, ether, saturated aliphatic hydrocarbons and alcohols, used successively. The process is particularly applicable to polypropylenes produced by the Ziegler process. Preferably the polypropylene, after extraction, has a molecular weight above 40,000. The sintering may be effected at temperatures up to 170 DEG C. and is preferably carried out in an inert or reducing atmosphere. The material to be sintered may be used in a loose state or may first be shaped under pressure. Pressure may also be applied during the sintering. In an example a polypropylene produced by the Ziegler process, and having a molecular weight of 75,000 is refluxed successively with acetone, ether and heptane, solvent being removed by heating after each stage. The product is moulded and sintered at 100 DEG C. under 20 atmospheres pressure of hydrogen. Reference has been directed by the Comptroller to Specification 856,735.ALSO:A process for the production of a porous body of polypropylene comprises subjecting polypropylene to solvent extraction and thereafter sintering the polypropylene. The extraction can be effected in separate steps with at least two different solvents, e.g. acetone, ether, saturated aliphatic hydro carbons and alcohols, successively. The process is particularly applicable to polypropylenes produced by the Ziegler process. Preferably the polypropylene, after extraction, has a molecular weight above 40,000. The sintering may be effected at temperatures up to 170 DEG C. and is preferably carried out in an inert or reducing atmosphere. The material to be sintered may be in a loose state or may first be shaped under pressure. Pressure may also be applied during the sintering. In an example a polypropylene produced by the Ziegler process, and having a molecular weight of 75,000, is refluxed successively with acetone, ether and heptane, solvent being removed by heating after each stage. The product is moulded and sintered at 100 DEG C. under 20 atmospheres pressure of hydrogen. Reference has been directed by the Comptroller to Specification 856,735.
GB33492/57A 1956-11-08 1957-10-28 Process for the production of a porous body of polypropylene Expired GB874761A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE874761X 1956-11-08

Publications (1)

Publication Number Publication Date
GB874761A true GB874761A (en) 1961-08-10

Family

ID=6816995

Family Applications (1)

Application Number Title Priority Date Filing Date
GB33492/57A Expired GB874761A (en) 1956-11-08 1957-10-28 Process for the production of a porous body of polypropylene

Country Status (1)

Country Link
GB (1) GB874761A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1696281A3 (en) * 2005-02-28 2010-01-13 Xerox Corporation Method and system for increasing density of toner in a toner container

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1696281A3 (en) * 2005-02-28 2010-01-13 Xerox Corporation Method and system for increasing density of toner in a toner container

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