GB726567A - Improvements in or relating to laminated structures comprising glass cloth and particulated mica - Google Patents

Improvements in or relating to laminated structures comprising glass cloth and particulated mica

Info

Publication number
GB726567A
GB726567A GB6024/53A GB602453A GB726567A GB 726567 A GB726567 A GB 726567A GB 6024/53 A GB6024/53 A GB 6024/53A GB 602453 A GB602453 A GB 602453A GB 726567 A GB726567 A GB 726567A
Authority
GB
United Kingdom
Prior art keywords
sio
glass cloth
mica
impregnated
per cent
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
GB6024/53A
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.)
Dow Silicones UK Ltd
Original Assignee
Dow Corning 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 Dow Corning Ltd filed Critical Dow Corning Ltd
Publication of GB726567A publication Critical patent/GB726567A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B19/00—Layered products comprising a layer of natural mineral fibres or particles, e.g. asbestos, mica
    • B32B19/02—Layered products comprising a layer of natural mineral fibres or particles, e.g. asbestos, mica the layer of fibres or particles being impregnated or embedded in a plastic substance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/003—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts characterised by the matrix material, e.g. material composition or physical properties
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/04—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances mica
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/08—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances quartz; glass; glass wool; slag wool; vitreous enamels
    • H01B3/084—Glass or glass wool in binder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2309/00—Use of inorganic materials not provided for in groups B29K2303/00 - B29K2307/00, as reinforcement
    • B29K2309/08—Glass

Landscapes

  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Composite Materials (AREA)
  • Mechanical Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Reinforced Plastic Materials (AREA)
  • Organic Insulating Materials (AREA)

Abstract

726,567. Laminated sheet materials. DOW CORNING, Ltd. March 4, 1953 [March 20, 1952], No. 6024/53. Drawings to Specification. Class 140. A laminated sheet material comprises alternate layers of particulated mica having an average particle size of at least 1 mil., and glass cloth, the two outer layers being glass cloth, the layers being bonded and impregnated with an organopolysiloxane resin having 1 to 1.6 organic radicals per silicon atom and in which resin the polymer units have the general formula R n SiO 4-n , where n is 1 or 2 and R is 2 methyl or phenyl. Suitable resins specified include combinations of the following siloxane units: C 6 H 5 SiO 1À5 , CH 3 SiO 1À5 , (CH 3 ) 2 SiO, (C 6 H 5 )CH 3 SiO, and (C 6 H 5 ) 2 SiO, together with SiO 2 units and R 2 SiO 0À5 units (R being methyl or phenyl). Preferably at least 50 per cent of the total organic radicals are methyl. Wet- and dry-ground micas as used in commerce, and mica obtained by splitting scrap mica with a hydraulic jet beneath the surface of a watermethanol solution may be used. The mica may be sheeted in known manner, e.g. on a nylon or glass cloth backing, stripping off the backing and impregnating with a siloxane resin. The glass cloth used in the laminate may be separately impregnated, the layers then assembled and heated in a press at temperatures up to 175‹ C. Curing at 250‹ C. may follow if necessary. The laminates so produced have a dielectric strength of greater than 300 volts per mil. after being heated at 250‹ C. for 250 hours. Catalysts such as the carboxylic acid salts of potassium, sodium, zinc, lead, cobalt and tin in amounts less than 1 per cent by weight of the siloxane resin may be employed to hasten the curing. In an example, mica sheets 4 to 6 mils. thick are prepared by deposition from a water slurry on to glass cloth. After removal from the cloth the sheets are impregnated with a 3 per cent toluene solution of a siloxane resin A containing dimethylsiloxane, monophenyl siloxane and monomethylsiloxane groups with potassium acetate as catalyst. After drying and curing the sheets are further impregnated with a 25 per cent toluene solution of a siloxane resin B containing phenylmethylsiloxane, dimethylsiloxane, monophenylsiloxane and monomethylsiloxane groups (catalysed by potassium acetate) dried and cured. Glass cloth is impregnated with a 60 per cent toluene solution of resin A catalysed by 0.22 per cent of lead 2-ethylhexoate and 0.7 per cent of dibutyl tin diacetate, and cured. Seven layers of impregnated glass cloth and six of impregnated mica sheet are laminated, moulded at 1750‹ C. and cured. Specification 726,563 is referred to.
GB6024/53A 1952-03-20 1953-03-04 Improvements in or relating to laminated structures comprising glass cloth and particulated mica Expired GB726567A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US726567XA 1952-03-20 1952-03-20

Publications (1)

Publication Number Publication Date
GB726567A true GB726567A (en) 1955-03-23

Family

ID=22108991

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6024/53A Expired GB726567A (en) 1952-03-20 1953-03-04 Improvements in or relating to laminated structures comprising glass cloth and particulated mica

Country Status (2)

Country Link
BE (1) BE518504A (en)
GB (1) GB726567A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4568604A (en) * 1983-12-30 1986-02-04 J & J Corp., #1 Synthetic resin product and method and apparatus for manufacture thereof
US5388767A (en) * 1993-09-20 1995-02-14 American Matrix Technologies, Inc. Spray gun with check valve
US5388768A (en) * 1993-09-20 1995-02-14 American Matrix Technologies, Inc. Spray gun with a catalyst injector and a manifold block
US5388763A (en) * 1993-09-20 1995-02-14 American Matrix Technologies, Inc. Spray gun with pressure gauge
US5405083A (en) * 1993-09-20 1995-04-11 American Matrix Technologies, Inc. Spray gun with disposable mixer
EP0792737A2 (en) * 1996-02-29 1997-09-03 Sumitomo Bakelite Company Limited Laminated board and process for production thereof
US6124220A (en) * 1995-03-28 2000-09-26 Sumitomo Bakelite Company Limited Laminated board and process for production thereof

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4568604A (en) * 1983-12-30 1986-02-04 J & J Corp., #1 Synthetic resin product and method and apparatus for manufacture thereof
US5388767A (en) * 1993-09-20 1995-02-14 American Matrix Technologies, Inc. Spray gun with check valve
US5388768A (en) * 1993-09-20 1995-02-14 American Matrix Technologies, Inc. Spray gun with a catalyst injector and a manifold block
US5388763A (en) * 1993-09-20 1995-02-14 American Matrix Technologies, Inc. Spray gun with pressure gauge
US5405083A (en) * 1993-09-20 1995-04-11 American Matrix Technologies, Inc. Spray gun with disposable mixer
US6124220A (en) * 1995-03-28 2000-09-26 Sumitomo Bakelite Company Limited Laminated board and process for production thereof
EP0792737A2 (en) * 1996-02-29 1997-09-03 Sumitomo Bakelite Company Limited Laminated board and process for production thereof
EP0792737A3 (en) * 1996-02-29 1998-07-22 Sumitomo Bakelite Company Limited Laminated board and process for production thereof

Also Published As

Publication number Publication date
BE518504A (en)

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