GB756614A - High pressure polymerization of alkylcyclosiloxanes - Google Patents

High pressure polymerization of alkylcyclosiloxanes

Info

Publication number
GB756614A
GB756614A GB17039/54A GB1703954A GB756614A GB 756614 A GB756614 A GB 756614A GB 17039/54 A GB17039/54 A GB 17039/54A GB 1703954 A GB1703954 A GB 1703954A GB 756614 A GB756614 A GB 756614A
Authority
GB
United Kingdom
Prior art keywords
reactor
pressure
high pressure
alkylcyclosiloxanes
effected
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
GB17039/54A
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.)
Union Carbide Corp
Original Assignee
Union Carbide and Carbon Corp
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 Union Carbide and Carbon Corp filed Critical Union Carbide and Carbon Corp
Publication of GB756614A publication Critical patent/GB756614A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Silicon Polymers (AREA)

Abstract

Alkylcyclosiloxanes of the formula (RR1SiO)y, where R is an alkyl radical, R1 is a hydrogen atom or alkyl radical and y is an integer of 3 to 5, are converted to higher molecular weight polymers by subjecting them to a pressure of at least 1500 and preferably 15,000 to 100,000 lbs. per sq. in. The process may be effected at 100 DEG to 350 DEG C. and under static or continuous flow conditions. The former process may be effected (1) by charging a reactor to maximum capacity with the cyclosiloxane, sealing and applying pressure by heating the charge, the reactor being provided with an automatic back pressure valve; or (2) by charging the siloxane into an open reactor and applying pressure on the charge by means of a hydraulic press or high pressure fluid intensifier. The latter process is conducted in a heavy-walled tube-type reactor provided with heating means by maintaining positive flow through the reaction zone, pressure being applied by means of a high pressure plunger-type pump or by a hydraulic intensifier pump. Examples are given in which the cylic diethyl trimer is polymerized.
GB17039/54A 1953-06-10 1954-06-10 High pressure polymerization of alkylcyclosiloxanes Expired GB756614A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US756614XA 1953-06-10 1953-06-10

Publications (1)

Publication Number Publication Date
GB756614A true GB756614A (en) 1956-09-05

Family

ID=22127200

Family Applications (1)

Application Number Title Priority Date Filing Date
GB17039/54A Expired GB756614A (en) 1953-06-10 1954-06-10 High pressure polymerization of alkylcyclosiloxanes

Country Status (1)

Country Link
GB (1) GB756614A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010108853A1 (en) 2009-03-26 2010-09-30 Dow Corning Corporation Preparation of organosiloxane polymers
US8344087B2 (en) 2005-04-06 2013-01-01 Dow Corning Corporation Hydrosilylation cured organosiloxanes having diluent therein
US8735493B2 (en) 2009-03-26 2014-05-27 Dow Corning Corporation Preparation of organosiloxane polymers

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8344087B2 (en) 2005-04-06 2013-01-01 Dow Corning Corporation Hydrosilylation cured organosiloxanes having diluent therein
WO2010108853A1 (en) 2009-03-26 2010-09-30 Dow Corning Corporation Preparation of organosiloxane polymers
US8487037B2 (en) 2009-03-26 2013-07-16 Dow Corning Corporation Preparation of organosiloxane polymers
US8735493B2 (en) 2009-03-26 2014-05-27 Dow Corning Corporation Preparation of organosiloxane polymers

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