MDI-based polyurethane prepolymer with low monomeric MDI content

A prepolymer composition comprises a reaction product of 4,4'-diphenylmethane diisocyanate (MDI) with a polyol composition comprising a propylene oxide based polyether polyol. The prepolymer composition consists of at least 80 weight (wt.%) perfect prepolymers and less than 2 wt.% free MDI mono...

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Bibliographische Detailangaben
Hauptverfasser:	PAULSEN, EVELYN JENNIFER LIN, GODDARD, RICHARD JOSEPH, SMITH, ANDREA KAREN
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE ADHESIVES CHEMISTRY COMPOSITIONS BASED THEREON DYES MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON 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 prepolymer composition comprises a reaction product of 4,4'-diphenylmethane diisocyanate (MDI) with a polyol composition comprising a propylene oxide based polyether polyol. The prepolymer composition consists of at least 80 weight (wt.%) perfect prepolymers and less than 2 wt.% free MDI monomer. Independent claims are included for the following: (1) An improved polyurethane adhesive composition which comprises a polyurethane prepolymer composition and optionally an isocyanate-reactive curative; and (2) A method for adhesively joining or sealing two substrates using a polyurethane adhesive composition, which involves applying polyurethane adhesive composition on a substrate and contacting the adhesive to another substrate, such that a bond is formed.