GB645105A - Improvements in phonograph records - Google Patents

Improvements in phonograph records

Info

Publication number
GB645105A
GB645105A GB18752/48A GB1875248A GB645105A GB 645105 A GB645105 A GB 645105A GB 18752/48 A GB18752/48 A GB 18752/48A GB 1875248 A GB1875248 A GB 1875248A GB 645105 A GB645105 A GB 645105A
Authority
GB
United Kingdom
Prior art keywords
per cent
acrylonitrile
isobutylene
peroxide
polymerization
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
GB18752/48A
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.)
Uniroyal Inc
Original Assignee
United States Rubber Co
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 United States Rubber Co filed Critical United States Rubber Co
Publication of GB645105A publication Critical patent/GB645105A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
    • G11B3/68—Record carriers
    • G11B3/70—Record carriers characterised by the selection of material or structure; Processes or apparatus specially adapted for manufacturing record carriers
    • G11B3/705—Record carriers characterised by the selection of material or structure; Processes or apparatus specially adapted for manufacturing record carriers characterised by the selection of the material only
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Polymerisation Methods In General (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Polymerization Catalysts (AREA)

Abstract

Isobutylene-acrylonitrile copolymers (preferably containing 65-85 per cent acrylonitrile and 35-15 per cent isobutylene) are moulded to form gramophone records. Co-polymerization may be effected in oil phase or aqueous emulsion at elevated temperature using catalysts, e.g. hydrogen peroxide, potassium persulphate, benzoyl peroxide, acetyl peroxide or tertiary butyl hydroperoxide, regulators, e.g. dodecyl mercaptan, emulsifying agents, e.g. dioctyl sodium sulphosuccinate, a soap or formaldehyde condensed with the sodium salt of naphthalene sulphonic acid. The resulting copolymer of concentration 10-50 per cent by weight is flocculated, e.g. by brine, filtered, washed and dried. In a modified co-polymerization process acrylonitrile is added gradually. Plasticizers, dyes, pigments, fillers or other resins may be added before moulding.
GB18752/48A 1947-09-17 1948-07-13 Improvements in phonograph records Expired GB645105A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US645105XA 1947-09-17 1947-09-17

Publications (1)

Publication Number Publication Date
GB645105A true GB645105A (en) 1950-10-25

Family

ID=22056469

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18752/48A Expired GB645105A (en) 1947-09-17 1948-07-13 Improvements in phonograph records

Country Status (1)

Country Link
GB (1) GB645105A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4125654A (en) 1976-06-11 1978-11-14 Kureha Kagaku Kogyo Kabushiki Kaisha Information signal recording disc

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4125654A (en) 1976-06-11 1978-11-14 Kureha Kagaku Kogyo Kabushiki Kaisha Information signal recording disc

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