Heat-Curable Adhesive Composition for Faster Crosslinking and Tack

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current self-adhesive articles, particularly those with high grammage, face challenges in achieving improved adhesive power, tack, elongation, and resistance to rupture, especially in applications like double or triple glazing, where mechanical requests and temperature variations are significant. Additionally, the retication time for these materials is lengthy, impacting industrial productivity.

Innovation Solution

A reticable adhesive composition comprising a polymer with hydrolysable alkoxysilane groups, a tackifying resin, a resin silsquioxane, and a retication catalyst, which forms a self-adhesive support with enhanced properties when heated, reducing retication time and improving adhesive performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If heat-curable adhesive compositions based on hydrolyzable alkoxysilane-terminated polyurethane or polyether are used, then adhesive bond strength and three-dimensional network structure are improved, but adhesive power and tack are insufficient

Engineering Contradiction:

Improveadhesive bond strengthVSAvoidadhesive power and tack

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent combines hydrolyzable alkoxysilane-terminated polyurethane/polyether (providing crosslinking and bond strength) with specific tackifying resins (colophony, terpene resins, or phenolic resins) to create a composite adhesive system. This composite formulation simultaneously achieves strong adhesive bonds through siloxane crosslinking and sufficient tack through the resin components, resolving the contradiction between bond strength and adhesive power.

Inventive Principle:

Principle #40Composite materials

2Reliability

If conventional self-adhesive compositions are used for high-grammage applications, then basic adhesion is achieved, but elongation and resistance to breakage are insufficient under mechanical stress and temperature variations

Engineering Contradiction:

Improvebasic adhesionVSAvoidelongation and resistance to breakage

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent modifies the chemical composition parameters by incorporating specific tackifying resins (colophony, terpene resins, or phenolic resins) in controlled amounts (1-20% by weight) into the siloxane-based adhesive system. This parameter change enhances the elastomeric properties, elongation, and resistance to breakage of the adhesive seal, enabling it to withstand mechanical stresses and temperature variations in high-grammage applications like double or triple glazing.

Inventive Principle:

Principle #35Parameter changes

3Strength

If thorough crosslinking is performed to ensure adhesive performance, then bond strength is improved, but retication time increases and productivity decreases

Engineering Contradiction:

Improvebond strengthVSAvoidretication time

Core Design Contradiction:

StrengthVSProductivity

Solution Approach 1:

The patent introduces a crosslinking catalyst as an intermediary substance that accelerates the crosslinking reaction. By adding catalytic amounts of metal salts (such as zinc, aluminum, or titanium compounds) or organic compounds to the adhesive composition, the retication time is significantly reduced while still achieving thorough crosslinking and optimal bond strength, thus resolving the contradiction between bond strength and productivity.

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The composition results in self-adhesive articles with improved adhesive power, tack, and resistance to rupture, while significantly reducing retication time, thus enhancing industrial productivity and performance on various substrates.

Implementation Method 1

a chemical crosslinking reaction carried out in the presence of moisture, to the formation of a self-adhesive backing... This crosslinking reaction results in the formation of an adhesive bond with a three-dimensional polymeric network structure containing siloxane bonds

Methodology Applied

Scientific EffectHydrolysis: Hydrolysis

Implementation Method 2

Methodology Applied

Scientific EffectCondensation: Condensation

Implementation Method 3

Coating these compositions onto a substrate and heating them leads, through a chemical crosslinking reaction... The resulting multi-layer system is generally wound onto large rolls... which can be stored and transported

Methodology Applied

Scientific EffectHeating: Heating

Data Source

PatentEP3898748B1Novel heat-curable compositions and self-adhesive articles thereof

Publication Date: 2026.04.01 BOSTIK SA(FR)

Figure 1

AI summary

1) The invention relates to an adhesive composition which is cross-linkable by heating, comprising: - at least one polymer (A) comprising a hydrolysable alkoxysilane group; - at least one tackifying resin (B); - at least one silsesquioxane resin (C); and - at least one cross-linking catalyst (D). 2) Self-adhesive article comprising a support layer coated with a self-adhesive layer consisting of the adhesive composition in the cross-linked state.