TEILCHENFOERMIGES POLYMERMATERIAL MIT SPEZIELLEN FORMEIGENSCHAFTEN

1451891 Moulding of graft polymers DEFENCE SECRETARY OF STATE FOR 19 Sept 1973 [25 Sept 1972] 44136/72 Heading C3G A moulding is produced from particulate polymer material in which the particles have a nucleus of thermoplastic polymer material surrounded by a cross-linked polymer layer and an outer...

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Hauptverfasser:	JOHN FYDELOR,PETER, BRIAN PITHOUSE,KENNETH
Format:	Patent
Sprache:	ger
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G BASIC ELECTRIC ELEMENTS CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOSITIONS BASED THEREON ELECTRICITY GENERAL PROCESSES OF COMPOUNDING MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS MAKING GRANULES OR PREFORMS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS THEIR PREPARATION OR CHEMICAL WORKING-UP THEIR RELEVANT APPARATUS TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL WORKING-UP
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Zusammenfassung:	1451891 Moulding of graft polymers DEFENCE SECRETARY OF STATE FOR 19 Sept 1973 [25 Sept 1972] 44136/72 Heading C3G A moulding is produced from particulate polymer material in which the particles have a nucleus of thermoplastic polymer material surrounded by a cross-linked polymer layer and an outer polar graft copolymer layer, the said moulding having the property that when it is heated to a determinable temperature below the temperature at which it softens the particles separate with respect to their nearest neighbours such that the material disintegrates to its original particulate form. The thermoplastic polymer forming the nuclei of the particles may be polyethylene, polypropylene, polytetrafluoroethylene, partially fluorinated polyolefin, partially chlorinated polyolefin or nylon and the monomer used to form the outer graft polymer layer and optionally also to act as cross-linking agent in the cross-linked polymer layer may be an ethylenically unsaturated carboxylic acid, acrylamide or methacrylamide. Examples are given in which polyethylene powder or polytetrafluoroethylene fluff is subjected to irradiation from a Co60 source in an aqueous solution of acrylic acid and the resulting graft polymer powder is converted to its potassium salt form and moulded.