One-component moisture-curable adhesive composition

    公开(公告)号:US12091587B2

    公开(公告)日:2024-09-17

    申请号:US18577455

    申请日:2022-07-13

    Abstract: A one-component moisture-curing adhesive composition is provided, comprising from 80 to 100 wt % of an isocyanate-functional prepolymer obtainable by reacting (a) a polyisocyanates mixture having an average nominal isocyanate functionality in the range of from above 2.00 to below 2.05, and (b) a polyol mixture, wherein the equivalent ratio between isocyanate groups in (a) and hydroxyl groups in (b) is in the range of from 3.5 to 7.0, wherein the content of free isocyanate groups in the adhesive composition is in the range of from 14 to 17 wt %, and wherein polyisocyanates mixture (a) comprises (a1) a diisocyanate comprising methyl diphenyl diisocyanate in excess of (a2) a uretonimine-modified methyl diphenyl diisocyanate comprising at least 3 isocyanate functional groups. A method of bonding a first piece of material to a second piece of material using such adhesive composition, and an object made from the method, are also provided.

    PRESSURE-SENSITIVE ADHESIVE SHEET
    6.
    发明公开

    公开(公告)号:US20240271014A1

    公开(公告)日:2024-08-15

    申请号:US18430979

    申请日:2024-02-02

    Abstract: Provided is a pressure-sensitive adhesive sheet excellent in water resistance. The pressure-sensitive adhesive sheet includes: a base material; and a pressure-sensitive adhesive layer formed of a water-dispersed pressure-sensitive adhesive composition including a water-dispersed acrylic polymer, an active energy ray-curable resin, and a photopolymerization initiator. The pressure-sensitive adhesive sheet has a pressure-sensitive adhesive strength maintenance ratio of 75% or more, which is calculated from the following equation: Pressure-sensitive adhesive strength maintenance ratio (%)={pressure-sensitive adhesive strength before immersion in water at 23° C. for 30 minutes (N/20 mm)/pressure-sensitive adhesive strength after immersion in water at 23° C. for minutes (N/20 mm)}×100.

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