ONE-PART THERMALLY CURABLE COMPOSITION

    公开(公告)号:US20210324250A1

    公开(公告)日:2021-10-21

    申请号:US17271457

    申请日:2019-09-18

    Abstract: A one-part thermally curable composition comprises at least one polyuretdione, thermally activatable amine curative; optional epoxy resin; optional polythiol having an average sulfhydryl group functionality of at least 2; and optional acid stabilizer. The at least one polyuretdione has an average uretdione ring functionality of at least 1.2, and is a reaction product of components comprising: a uretdione-containing material comprising a reaction product of a diisocyanate reacted with itself; a first hydroxyl-containing compound having a single OH group, wherein the first hydroxyl-containing compound is a primary alcohol or a secondary alcohol; and a second hydroxyl-containing compound having more than one OH group, wherein the second hydroxyl-containing compound is a polyol and the reaction product comprises 0.2 to 0.5, inclusive, of hydroxyl equivalents relative to isocyanate equivalents. Cured compositions and assemblies including them are also disclosed.

    POLYMERIC MATERIAL INCLUDING URETDIONE-CONTAINING MATERIAL, POLYTHIOL, AND ACIDIC STABILIZER, TWO-PART COMPOSITIONS, AND METHODS

    公开(公告)号:US20210317258A1

    公开(公告)日:2021-10-14

    申请号:US17265011

    申请日:2019-09-16

    Abstract: The present disclosure provides a polymeric material including a polymerized reaction product of a polymerizable composition including components, a polythiol having an average sulfhydryl group functionality of 2 or greater, and an acidic stabilizer. The components include a uretdione-containing material including a reaction product of a diisocyanate reacted with itself; a first hydroxyl-containing compound having more than one OH group; and an optional second hydroxyl-containing compound having a single OH group. The second hydroxyl-containing compound is a primary alcohol or a secondary alcohol. The present disclosure also provides a two-part composition, in which a polymeric material is included in the first part and the second part includes at least one accelerator. Further, a method of adhering two substrates is provided, including obtaining a two-part composition; combining at least a portion of the first part with at least a portion of the second part to form a mixture; disposing at least a portion of the mixture on a first substrate; and contacting a second substrate with the mixture disposed on the first substrate. The disclosure also provides a polymeric material and a method of curing a two-part composition. Advantageously, two-part compositions according to the present disclosure can be used as sealants, coatings, and adhesive systems having a two-step cure with handling and performance similar to existing two-part urethane systems, but with less sensitivity to water.

    Viscoelastic wound closure dressing

    公开(公告)号:US10973692B2

    公开(公告)日:2021-04-13

    申请号:US15533733

    申请日:2015-12-10

    Abstract: A viscoelastic wound closure dressing. The dressing can include a viscoelastic backing having a first major surface configured to face skin when in use, a first end, a second end, and a middle section located between the first end and the second end. The wound closure dressing can further include a skin-contact adhesive on the first major surface of the viscoelastic backing adjacent the first end and the second end. A majority of the first major surface of the middle section can be free of the skin-contact adhesive. The viscoelastic backing can recover, at room temperature: (i) no more than 40% of its deformation after 10 seconds, after being strained to 50% elongation for 30 minutes, and (ii) at least 70% of its deformation after 48 hours, after being strained to 50% elongation for 30 minutes.

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