GB832489A - A process for preparing high polymeric siloxanes - Google Patents

A process for preparing high polymeric siloxanes

Info

Publication number
GB832489A
GB832489A GB8132/57A GB813257A GB832489A GB 832489 A GB832489 A GB 832489A GB 8132/57 A GB8132/57 A GB 8132/57A GB 813257 A GB813257 A GB 813257A GB 832489 A GB832489 A GB 832489A
Authority
GB
United Kingdom
Prior art keywords
ammonium hydroxide
salt
radical
alkali metal
heating
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
GB8132/57A
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.)
Midland Silicones Ltd
Original Assignee
Midland Silicones Ltd
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 Midland Silicones Ltd filed Critical Midland Silicones Ltd
Publication of GB832489A publication Critical patent/GB832489A/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
    • C08G77/04—Polysiloxanes
    • C08G77/22—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
    • C08G77/24—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen halogen-containing groups

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

High polymeric fluoroalkyl siloxane gums are prepared by heating a cyclotrisiloxane of the formula (R11CH2CH2RSiO)3, in which R11 is a perfluoroalkyl radical of 1 to 10 carbon atoms and R is a mono-valent hydrocarbon radical or the radical R11CH2CH2, in the presence of an alkaline catalyst which is an alkali metal hydroxide, a quaternary ammonium hydroxide or a siloxane salt of one of these hydroxides, at a temperature and for a time sufficient to cause the desired polymerization without appreciable degradation of the polymer so formed to cyclosiloxanes. The cyclic trisiloxanes are described in Specification 832,487. The radicals R include alkyl, alkenyl, cycloaliphatic, aralkyl and aryl. Specified catalysts are the alkali metal hydroxides, Me2SiOK, PhMeSiOLi, NaO(SiMe2O)3Na, Et3SiONa, Ph3 SiOK, beta-hydroxyethyltrimethyl ammonium hydroxide, benzyltrimethyl ammonium hydroxide, didodecyldimethyl ammonium hydroxide, Me3SiONMe4, PhMe2SiONMe3CH2CH2OH and the benzyltrimethyl ammonium salt of dimethyl silane diol. A limited amount of solvent may be present, e.g. toluene, xylene, dibutyl and diphenyl ethers and the nitrogen-containing solvents disclosed in Specification 722,482. In the example, the cyclic 3,3,3-trifluoropropyl methyl trisiloxane is heated with the salt KO(Me2SiO)2K for 4 to 5 minutes at 76 DEG C., to form dry gum. Heating to 150 DEG C. for 3 minutes produced high polymers which degraded to low cycles. The gums may be used to prepare rubbers as described in Specification 832,488.
GB8132/57A 1956-06-27 1957-03-12 A process for preparing high polymeric siloxanes Expired GB832489A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US832489XA 1956-06-27 1956-06-27

Publications (1)

Publication Number Publication Date
GB832489A true GB832489A (en) 1960-04-13

Family

ID=22177123

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8132/57A Expired GB832489A (en) 1956-06-27 1957-03-12 A process for preparing high polymeric siloxanes

Country Status (1)

Country Link
GB (1) GB832489A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3269984A (en) * 1963-12-16 1966-08-30 Gen Electric Polymerization of hexaorgano-cyclotrisiloxanes
EP0402781A2 (en) * 1989-06-16 1990-12-19 General Electric Company Fluorosilicone Compositions with improved elastic response

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3269984A (en) * 1963-12-16 1966-08-30 Gen Electric Polymerization of hexaorgano-cyclotrisiloxanes
EP0402781A2 (en) * 1989-06-16 1990-12-19 General Electric Company Fluorosilicone Compositions with improved elastic response
EP0402781A3 (en) * 1989-06-16 1992-10-07 General Electric Company Fluorosilicone compositions with improved elastic response

Similar Documents

Publication Publication Date Title
US3884866A (en) High strength organopolysiloxane compositions
US4011197A (en) Method of curing organosiloxane compositions using microwaves
GB992366A (en) Novel siloxane materials
GB870635A (en) Organosiloxanes
US2994684A (en) Method of copolymerizing cyclic phenylsiloxanes
US3153007A (en) Process for making organopolysiloxanes using bromoalkane decatalyzing agents for excess alkali-metal catalysts
GB1123729A (en) Siloxane block co-polymers and the preparation thereof
CN108864433A (en) thermoplastic silicone material and preparation method
GB832489A (en) A process for preparing high polymeric siloxanes
US3132167A (en) Process for preparing linear silanol chain-stopped diorganopolysiloxanes
US3694427A (en) Curable silox anol-silacyclobutane composition
GB882069A (en) Organopolysiloxanes and process for producing same
NO783475L (en) MANUFACTURE OF NON-ADHESIVE COATINGS.
US3412129A (en) Alkali metal sulfate substituted organosiloxanes containing internal sulfate groups and process therefor
US2870120A (en) Production of vinyl siloxane potting compounds
GB1114918A (en) Process for the preparation of organopolysiloxanes
GB882053A (en) Poly-substituted ammonium silicon compounds and process for their preparation
GB848311A (en) A process for polymerising siloxanes
US3065203A (en) Polybiloxane stabilization
GB899939A (en) Acyloxy-end-blocked diorganopolysiloxanes
ES392865A1 (en) Alkyl fluorohexahalogenoisopropoxycarboxylate silicon derivatives and polymers and copolymers thereof
GB859284A (en) Improvements in or relating to silicone rubber
GB1092774A (en) Improvements in "cyclic siloxanes"
US3560437A (en) Method of preparing polydiorganosiloxane polymers from cyclic polydiorganosiloxanes
US2521678A (en) Process of preparing organopolysiloxane resins