Blocked urethane, resin composition, cured product and adhesive, and method for producing blocked urethane
A blocked urethane composition with controlled isocyanate ratios and polyether polycarbonate diol improves low-temperature impact strength, addressing the weakness of existing urethanes in adhesive applications.
JP2025136105APending Publication Date: 2025-09-19MITSUBISHI CHEM CORP
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Patent Information
- Application Number
- JP2024034311
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-03-06
- Publication Date
- 2025-09-19
AI Technical Summary
Technical Problem
Blocked urethanes described in existing technologies exhibit poor impact strength at low temperatures, limiting their effectiveness in adhesive applications.
Method used
A blocked urethane composition comprising specific structural units derived from a polyol, a branching agent, and a polyisocyanate compound, with controlled isocyanate group ratios and inclusion of a polyether polycarbonate diol, enhances low-temperature impact strength.
Benefits of technology
The composition provides adhesives with improved low-temperature impact strength and storage stability, suitable for use in resin compositions and cured products.
✦ Generated by Eureka AI based on patent content.
Abstract
To provide blocked urethane which is used as raw material of an adhesive excellent in low temperature impact strength.SOLUTION: Blocked urethane includes a structural unit derived from polyol (A), a structural unit derived from a branching agent (B), and a structural unit derived from a polyisocyanate compound (C), wherein a ratio (number of isocyanate groups / number of isocyanate reactive groups) of the mol number (number of isocyanate groups) of isocyanate groups in the polyisocyanate compound (C), to the mol number (number of isocyanate reactive groups) of the total of hydroxyl groups in the polyol (A) and groups reactive with isocyanate groups in the branching agent (B) is 1.8 or more, and the polyol (A) includes polyether polycarbonate diol represented by the following formula (1). In the formula (1), R represents a divalent hydrocarbon group having 2 to 10 carbon atoms, n is 2 to 30, and m is 1 to 20. In the formula (1), the plurality of R may be the same or different, and the plurality of n may be the same or different.SELECTED DRAWING: None
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