GB803129A - Improvements in or relating to siloxanes - Google Patents

Improvements in or relating to siloxanes

Info

Publication number
GB803129A
GB803129A GB24869/56A GB2486956A GB803129A GB 803129 A GB803129 A GB 803129A GB 24869/56 A GB24869/56 A GB 24869/56A GB 2486956 A GB2486956 A GB 2486956A GB 803129 A GB803129 A GB 803129A
Authority
GB
United Kingdom
Prior art keywords
units
per cent
siloxanes
phenyl
vinyl
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
GB24869/56A
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 GB803129A publication Critical patent/GB803129A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C08L83/04—Polysiloxanes
    • 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
    • C08G77/20—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
    • 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
    • C08G77/42—Block-or graft-polymers containing polysiloxane sequences
    • C08G77/44—Block-or graft-polymers containing polysiloxane sequences containing only polysiloxane sequences
    • 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
    • C08G77/70—Siloxanes defined by use of the MDTQ nomenclature

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Organic Insulating Materials (AREA)
  • Silicon Polymers (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

Symmetrical dimethyldiphenyldivinyldisiloxane may be made by reacting methylvinyldichlorosilane with a phenyl Grignard reagent to yield methylphenylvinylchlorosilane which is then hydrolysed and subsequently condensed by heating with potassium acetate in refluxing toluene. Casting resins are made by mixing (1) from 5 to 75 per cent (by weight) of the symmetrical siloxane with (2) from 25 to 95 per cent of a polysiloxane in which the polymer units are selected from monovinyl-, phenylvinyl-, monophenyl-, phenylmethyl-, monomethyl- and diphenyl-siloxanes and up to 10 mol. per cent of R3SiO units in which each R is a vinyl, methyl or phenyl radical, in siloxane (2) at least 10 mol. per cent of the units being vinylsiloxane units (i.e. any of the defined units having a vinyl radical), and the phenyl to Si ratio being from 0.25 : 1 to 1.1 : 1. The compositions may also contain fillers, e.g. metal oxides, silica, carbon black, glass fabric, asbestos, glass fibres, glass beads and clay, and may be cured by heating with organic peroxides or other catalysts to effect copolymerization via the vinyl groups in the two siloxanes. Examples are given. Uses.-The compositions may be cast into any desired shape, and may also be used to impregnate coils, transformers, &c., e.g. by vacuum impregnation. Specification 755,198 is referred to.
GB24869/56A 1956-01-05 1956-08-14 Improvements in or relating to siloxanes Expired GB803129A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US803129XA 1956-01-05 1956-01-05

Publications (1)

Publication Number Publication Date
GB803129A true GB803129A (en) 1958-10-15

Family

ID=22156584

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24869/56A Expired GB803129A (en) 1956-01-05 1956-08-14 Improvements in or relating to siloxanes

Country Status (1)

Country Link
GB (1) GB803129A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3176034A (en) * 1961-07-05 1965-03-30 Dow Corning Siloxane copolymers of allyl ethers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3176034A (en) * 1961-07-05 1965-03-30 Dow Corning Siloxane copolymers of allyl ethers

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