Laminates and packaging
A laminate with a cured adhesive layer between polyethylene resin layers, using a specific polyol-polyisocyanate ratio and polymeric diphenylmethane diisocyanate, addresses tear resistance and residual isocyanate issues, enhancing usability and safety in polyethylene packaging.
JP7885670B2Active Publication Date: 2026-07-07TOYO INK MFG CO LTD +1
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- TOYO INK MFG CO LTD
- Filing Date
- 2022-12-15
- Publication Date
- 2026-07-07
Smart Images
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Abstract
To provide a laminate and a package that have a structure including a first polyethylene resin layer, an adhesive layer, and a second polyethylene resin layer, contains a small amount of residual isocyanate components, and have excellent tearability.SOLUTION: A laminate has a partial structure including an adhesive layer between a first polyethylene resin layer and a second polyethylene resin layer, and satisfies the following (1) to (3). (1) The adhesive layer is a cured product of a reactive adhesive containing a polyol (A) and a polyisocyanate (B), and the storage elastic modulus (ErAD [MPa]) of the cured product at 20°C satisfies formula 1. Formula 1: ErAD≥500 (2) The reactive adhesive has a ratio of the total number of hydroxyl groups in the polyol (A) to the total number of isocyanate groups in the polyisocyanate (B) of 1.0 to 2.9. (3) The polyisocyanate (B) contains a polymeric diphenylmethane diisocyanate and an isocyanate monomer.SELECTED DRAWING: None
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