Dissimilar arm asymmetric radial or star block copolymers for adhesives and sealants

A radial or star asymmetric block copolymer of the formula (I) is new. (A-HD)x-Y-(UD)z (I). A = vinyl aromatic hydrocarbon block having a peak Mw of 4000-20000; HD = hydrogenated conjugated diene block having a peak Mw of 10000-100000; Y = multifunctional coupling agent; UD = unhydrogenated conjugat...

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Bibliographische Detailangaben
Hauptverfasser:	R.J. HOXMEIER, S.S. CHIN, G.R. HIMES
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE ADHESIVES CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS DYES MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL ORGANIC MACROMOLECULAR COMPOUNDS PAINTS POLISHES THEIR PREPARATION OR CHEMICAL WORKING-UP USE OF MATERIALS AS ADHESIVES
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Beschreibung
Zusammenfassung:	A radial or star asymmetric block copolymer of the formula (I) is new. (A-HD)x-Y-(UD)z (I). A = vinyl aromatic hydrocarbon block having a peak Mw of 4000-20000; HD = hydrogenated conjugated diene block having a peak Mw of 10000-100000; Y = multifunctional coupling agent; UD = unhydrogenated conjugated diene block having a peak Mw of 1000-80000; x = 2-20; z = 1-10; and x+z = 3-30. The block copolymer has a vinyl aromatic hydrocarbon content of 4-35 wt.%. Also claimed are (i) an adhesive or sealant compsn. comprising the copolymer and a tackifying resin; and (ii) compsns. which are crosslinked.