Polyurethane compositions having good adhesion to plastics

A combination of linear and branched polymers with controlled plasticizer content in moisture-curable polyurethane compositions addresses the challenge of achieving rapid cure, high strength, and good adhesion to plastic substrates, enhancing safety and performance.

JP2026015328AInactive Publication Date: 2026-01-29SIKA TECH AG
0 Cites 0 Cited by

Patent Information

Application Number
JP2025170883
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2020-02-03
Filing Date
2025-10-09
Publication Date
2026-01-29
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Existing moisture-curable polyurethane compositions face challenges in achieving rapid cure, high strength, and good adhesion to plastic substrates, particularly at low diisocyanate monomer contents, which are often associated with health hazards and complex manufacturing processes.

Method used

A combination of linear and branched polymers with specific weight ratios and controlled plasticizer content, along with low diisocyanate monomer levels, enhances adhesion and strength while maintaining rapid cure and storage stability.

Benefits of technology

The composition achieves excellent adhesion to plastic substrates, high strength, and rapid cure, with improved safety and reduced health risks, offering a balance of properties not previously attainable with conventional methods.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure 2026015328000001
    Figure 2026015328000001
  • Figure 2026015328000002
    Figure 2026015328000002
  • Figure 2026015328000003
    Figure 2026015328000003
Patent Text Reader

Abstract

Even when the composition is formulated to have a very low diisocyanate monomer content, it provides high elongation, surprisingly high strength and surprisingly good adhesion to plastic substrates, thus providing an attractive EHS classification.SOLUTION: (i) at least one linear isocyanate group-containing polymer (37mgKOH) having an NCO content in the range from 0.3 to 3.3% by weight, obtainable from the reaction of at least one monomeric aromatic diisocyanate and a polyetherdiol having an OH number in the range from 5 to P1 / g; (ii) at least one isocyanate group-containing polymer (380mgKOH) obtained from the reaction of at least one monomeric aromatic diisocyanate and at least one polyethertriol having an average OH functionality of at least 2.2 and an OH number in the range from 16 to LA / g; And (iii) a flexibilizer in a content of up to 15% by weight, based on the overall composition, wherein the polymer (P2) and the polymer (P2) are present in a weight ratio in the range from 80 / 2 to 95 / 5, wherein the polymer (P1) has an NCO content in the range from 1 to 10% by weight. The invention also relates to the use of the composition as an elastic adhesive or elastic sealant or elastic coating.SELECTED DRAWING: None
Need to check novelty before this filing date? Find Prior Art