METHOD OF MODIFYING SURFACE OF POLYISOCYANATE POLYADDITIONAL PRODUCT

PURPOSE: To reduce finishing and recondition works in a manufacture in an assembly line to a minimum by heating the surfaces of particular polyisocyanate polyaddition products to a particular temperature, performing softening and leveling on microscopic surface structures, and simultaneously or subs...

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Bibliographische Detailangaben
Hauptverfasser:	YOAHIMU BUAGUNAA, BUERUNAA RASUHOFUAA
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMISTRY COMPOSITIONS BASED THEREON INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS 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 WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	PURPOSE: To reduce finishing and recondition works in a manufacture in an assembly line to a minimum by heating the surfaces of particular polyisocyanate polyaddition products to a particular temperature, performing softening and leveling on microscopic surface structures, and simultaneously or subsequently applying external pressure to the surfaces optionally. CONSTITUTION: During a closing mold, a compound having a molecular weight of 401 to about 20000 of an organic polyisocyanate and containing 2 to 8 isocyanate reactive groups is reacted with a compound having the molecular weight of 60 to 400 and containing 2 to 8 isocyanate reactive groups. The surfaces to be modified of moulded articles manufactured by a polyisocyanate polyaddition method are heated to at least 80 deg.C to perform softening and leveling on microscopic surface structures and optionally external pressure are substantially or subsequently applied. The moulded articles are solid elastomers or fine porous elastomers having a total density of 0.7 g/cm or more, preferably about 1.0-1.3 g/cm .