GB797979A - Improvements in or relating to organo-silicon compositions - Google Patents

Improvements in or relating to organo-silicon compositions

Info

Publication number
GB797979A
GB797979A GB4791/57A GB479157A GB797979A GB 797979 A GB797979 A GB 797979A GB 4791/57 A GB4791/57 A GB 4791/57A GB 479157 A GB479157 A GB 479157A GB 797979 A GB797979 A GB 797979A
Authority
GB
United Kingdom
Prior art keywords
per cent
mol
formula
polysiloxane
cured
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
GB4791/57A
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 GB797979A publication Critical patent/GB797979A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/14—Peroxides
    • 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
    • C08G77/70—Siloxanes defined by use of the MDTQ nomenclature

Abstract

A copolymerizable organosilicon composition comprises (1) from 5 to 75 per cent by weight of the trisiloxane of the formula <FORM:0797979/IV (a)/1> or of the formula <FORM:0797979/IV (a)/2> or of the formula <FORM:0797979/IV (a)/3> or mixtures thereof, and (2) from 25 to 95 per cent of a polysiloxane in which the units are monovinyl, phenylvinyl, monophenyl, phenylmethyl, monomethyl or diphenyl siloxane units, which polysiloxane may contain up to 20 mol. per cent of units of the formula R3SiO, where R is methyl, phenyl or vinyl, at least 10 mol. per cent of the polysiloxane being vinyl siloxane units and the phenyl : silicon ratio being from 0.25 : 1 to 1.1 : 1, and (3) an organic peroxide or per-ester curing agent. The compositions may be cast by the usual methods and may also be used to impregnate coils, transformers, &c. Fillers such as metal oxides, silica, carbon black, glass fabric, glass beads, asbestos and clays may be added to the compositions. In the examples: (1) a copolymer of 29.4 mol. per cent of PhViSiO, 62 mol. per cent of PhMeSiO and 8.6 mol. per cent of PhMeViSiO0.5, having a viscosity of 7400 c.s. at 25 DEG C., is mixed with 30 per cent by weight of Me2ViSiOSi(Ph2)O SiMe2Vi to give a mixture of viscosity 800 c.s., and 1 per cent of di-tert. butyl peroxide is added. The mixture is cured by heating at 150 DEG C.; (2) a copolymer of 60 mol. per cent of PhMeSiO and 40 per cent PhViSiO having a viscosity of 2,500 c.s. is mixed with 25 per cent by weight of Me2ViSiOSi(Ph)(Me)OSiMe2Vi and 1 per cent of di-tert. butyl peroxide, and is cured at 150 DEG C.; (3) 75 parts of the copolymer of Example 2 is mixed with 25 parts of Me2Vi SiOSi(Ph)(Vi)OSiMe2Vi and cured as before. The trisiloxanes may be prepared by cohydrolysing Me2ViSiCl with Ph2SiCl2 or PhMe SiCl2 or PhViSiCl2. Specification 755,198 is referred to.
GB4791/57A 1956-04-12 1957-02-12 Improvements in or relating to organo-silicon compositions Expired GB797979A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US797979XA 1956-04-12 1956-04-12

Publications (1)

Publication Number Publication Date
GB797979A true GB797979A (en) 1958-07-09

Family

ID=22152886

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4791/57A Expired GB797979A (en) 1956-04-12 1957-02-12 Improvements in or relating to organo-silicon compositions

Country Status (1)

Country Link
GB (1) GB797979A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2428059A1 (en) * 1978-06-05 1980-01-04 Dow Corning SOLVENT-FREE CURABLE POLYORGANOSILOXANE COMPOSITION
FR2497524A1 (en) * 1981-01-07 1982-07-09 Rhone Poulenc Ind
JPH08127657A (en) * 1994-10-31 1996-05-21 Dow Corning Asia Ltd Production of cured diphenylsiloxane and cured product

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2428059A1 (en) * 1978-06-05 1980-01-04 Dow Corning SOLVENT-FREE CURABLE POLYORGANOSILOXANE COMPOSITION
FR2497524A1 (en) * 1981-01-07 1982-07-09 Rhone Poulenc Ind
EP0055957A2 (en) * 1981-01-07 1982-07-14 Rhone-Poulenc Chimie Process for injection moulding organopolysiloxane pastes
EP0055957A3 (en) * 1981-01-07 1982-08-25 Rhone-Poulenc Specialites Chimiques Process for injection moulding organopolysiloxane pastes
US4442060A (en) * 1981-01-07 1984-04-10 Rhone-Poulenc Industries Injection-molding of pasty, thermosetting organopolysiloxane compositions
JPH08127657A (en) * 1994-10-31 1996-05-21 Dow Corning Asia Ltd Production of cured diphenylsiloxane and cured product

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