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    FLEXIBILIZING CAPPED PREPOLYMERS
    1.
    发明申请
    FLEXIBILIZING CAPPED PREPOLYMERS 有权

    公开(公告)号：US20210253778A1

    公开(公告)日：2021-08-19

    申请号：US17178793

    申请日：2021-02-18

    申请人： Covestro LLC

    发明人： Stephen D. Cummings ,  Matthew Stewart ,  Sharlene A. Lewis ,  Rick L. Adkins ,  Jack R. Reese

    IPC分类号： C08G18/73 ,  C08G18/83 ,  C08G18/48 ,  C09J163/00

    摘要： A flexibilizing capped prepolymer can include a reaction product of reaction mixture including a polyisocyanate and an isocyanate-reactive component at an equivalent ratio of polyisocyanate equivalents to isocyanate-reactive component equivalents of from 1.4:1 to 2.1:1. The isocyanate-reactive component can include a polyol component and a branching agent component. The branching agent component can include a monoglyceride, a diglyceride, a triglyceride, or a combination thereof having a number average functionality of from 3 to 6 NCO-reactive functional groups. The reaction product is terminated with a capping agent to form the flexibilizing capped prepolymer.

    ADHESIVE PRODUCED USING ASPARTATE-TERMINATED PREPOLYMERS
    3.
    发明申请
    ADHESIVE PRODUCED USING ASPARTATE-TERMINATED PREPOLYMERS 有权

    公开(公告)号：US20210179903A1

    公开(公告)日：2021-06-17

    申请号：US16898901

    申请日：2020-06-11

    申请人： Covestro LLC

    发明人： Raymond Zeliznik ,  Karl W. Haider ,  Francis C. Rossitto ,  Philip Jones ,  Matthew Stewart

    IPC分类号： C09J175/12 ,  B32B27/08 ,  B32B27/32 ,  B32B27/36 ,  B32B15/08 ,  B32B15/20 ,  B32B27/10

    摘要： Provided are adhesives comprising: (A) an aliphatic polyisocyanate; and (B) an aspartate-terminated prepolymer which is a reaction product of (B1) an aliphatic NCO-terminated prepolymer having a NCO content of from 0.5% to 35%, and (B2) a compound according to formula (I) wherein, X represents a linear or branched aliphatic group obtained by removing amino groups from a linear or branched aliphatic polyamine, R1 and R2 are identical or different and represent organic groups which are inert towards isocyanate groups at a temperature of 100° C. or less, R3 and R4 are identical or different and represent hydrogen or organic groups which are inert towards isocyanate groups at a temperature of 100° C. or less, n represents an integer with a value of at least 2, wherein the aspartate-terminated prepolymer (B) has a ratio of equivalents of NH groups to equivalents of NCO groups of 1.5:1 to 20:1, (C) optionally, a solvent, wherein the adhesive has a ratio of equivalents of NCO groups in the aliphatic polyisocyanate to equivalents of NH groups of from 0.9:1 to 1.75:1, wherein pot life of the adhesive, as measured by doubling of viscosity according to ASTM D4212-16 at 23° C., is greater than or equal to 0.5 hours, and wherein the adhesive develops an acceptable bond strength to a substrate, defined as having a minimum of 150 g/in. measured @ 23° C. according to ASTM D 1876-01 or substrate tear, in less than or equal to 5 days after the substrate is laminated with the adhesive.