Polymeric material including a uretdione-containing material, two-part compositions, and methods

Abstract

The present disclosure provides a polymeric material including a reaction product of a polymerizable composition and having a solids content of 90% or greater. The polymerizable composition includes auretdione-containing material including a reaction product of a diisocyanate reacted with itself, a first hydroxyl-containing compound having a single OH group, and a second hydroxyl-containing compound having more than one OH group. The first hydroxyl-containing compound is a primary alcohol or a secondary alcohol, plus the second hydroxyl-containing compound is a diol and the reaction product contains 0.2 to 0.5, inclusive, of diol equivalents relative to isocyanate equivalents. The present disclosure also provides a two-part composition, in which the polymeric material is included in the first part and the second part includes at least one amine. 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 making a two-part composition. Advantageously, two-part compositions according to the present disclosure can be used as coatings and adhesive systems with handling and performance similar to existing two-part urethane systems, but with less sensitivity to water.

Description

technical field [0001] The present disclosure relates to polymeric materials, such as two-part compositions, comprising uretdione-containing materials. Background technique [0002] Two-part urethane adhesives and sealants are commercially available from various companies. These systems generally involve one component, which is an oligomer / polymer terminated with isocyanate groups, and a second component, which is a polyol. When mixed, the isocyanate reacts with the polyol to form urethane groups. While this is an established and effective chemistry, it is sensitive to moisture due to the ability of isocyanates to deactivate when they react with water. Accordingly, there remains a need for adhesives and sealants that are advantageously less water sensitive. Contents of the invention [0003] In a first aspect, a polymeric material is provided. The polymeric material comprises the reaction product of a polymerizable composition and has a solids content of 90% or greater...

AI Technical Summary

Problems solved by technology

While this is an established and effective chemical, the chemical is sensitive to moisture due to the ability of isocyanates to deactivate when they react with water

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