Process for the after-treatment of polypivalolactone articles

Compositions for moulding which may be annealed without deformation other than shrinkage comprise a homo or copolymer of pivalolactone and a nucleating agent. The pivalolactone may be copolymerized with up to 25 mole per cent of b -propiolactone, a ,a -diethyl -b -propiolactone, or a -methyl, a -eth...

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Bibliographische Detailangaben
Hauptverfasser:	SELMAN JAN, OOSTERHOF HENDRICUS ANTHONIUS
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	Compositions for moulding which may be annealed without deformation other than shrinkage comprise a homo or copolymer of pivalolactone and a nucleating agent. The pivalolactone may be copolymerized with up to 25 mole per cent of b -propiolactone, a ,a -diethyl -b -propiolactone, or a -methyl, a -ethyl, b -propiolactone, polyamides or other polyesters. The nucleating agent which is present in 0.01 to 2% by weight may be silica, boron nitride, a binary compound of formula MX where M = an alkali metal and X = a halogen other than fluoride, or a neutral salt of a mono-, di- or trivalent metal and an organic acid with a carboxy, sulpho, sulphino, phosphono or phosphinico group attached to an aromatic carbon atom. Many examples of nucleating agents are given.