Self-Adhering Roofing Membrane With UV-Curable Low-Temperature Adhesion

Solution Overview

Problem

Conventional roofing membranes face limitations due to adhesives that lose tackiness at lower temperatures, leading to reduced effectiveness and cohesive failures over time, necessitating improvements in adhesive properties for broader temperature ranges.

Innovation Solution

A self-adhering roofing membrane with a dual adhesive layer system, comprising a first adhesive layer and a UV curable adhesive layer, where the UV curable adhesive remains tacky at low temperatures and provides high peel strength, allowing installation across varying environmental conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional adhesives are used on roofing membranes, then the roofing membrane can be secured to the roof, but the adhesives lose tackiness at lower temperatures and exhibit cohesive failures over time

Engineering Contradiction:

Improveadhesive tackinessVSAvoidworkable temperature range

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The adhesive system is divided into two separate layers: a first adhesive layer (hot melt or butyl rubber-based) applied directly to the polymeric membrane, and a second UV curable adhesive layer applied over the first layer. This segmentation allows each layer to perform its specialized function - the first layer provides initial adhesion and the second layer provides temperature-independent tackiness and UV curing for long-term reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention uses a composite adhesive structure combining two different adhesive materials with complementary properties. The first adhesive layer (hot melt or butyl rubber) provides baseline adhesion, while the second UV curable adhesive layer provides extended temperature range performance and UV-curable bonding strength, creating a composite system that overcomes the limitations of single-material adhesives.

Inventive Principle:

Principle #40Composite materials

2Ease of operation

If conventional adhesives are used to secure roofing membranes, then installation can proceed under normal conditions, but installation is limited to times when certain environmental conditions are present

Engineering Contradiction:

Improveinstallation flexibilityVSAvoidenvironmental condition range

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The invention changes the fundamental parameter of adhesive curing from temperature-dependent (conventional adhesives that rely on thermal activation) to UV light-dependent (UV curable adhesive). This parameter change allows the adhesive to remain tacky at low temperatures and cure reliably across a wide range of environmental conditions, including cold weather installation scenarios that previously constrained roofing operations.

Inventive Principle:

Principle #35Parameter changes

3Strength

If a single adhesive layer is used on roofing membranes, then the structure is simpler, but the adhesive exhibits cohesive failures over time and has low peel strengths

Engineering Contradiction:

Improvepeel strengthVSAvoidadhesive layer structure

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The adhesive system is divided into two separate layers: a first adhesive layer (hot melt or butyl rubber-based) applied directly to the polymeric membrane, and a second UV curable adhesive layer applied over the first layer. This segmentation allows each layer to perform its specialized function - the first layer provides initial adhesion and the second layer provides temperature-independent tackiness and UV curing for long-term reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention uses a composite adhesive structure combining two different adhesive materials with complementary properties. The first adhesive layer (hot melt or butyl rubber) provides baseline adhesion, while the second UV curable adhesive layer provides extended temperature range performance and UV-curable bonding strength, creating a composite system that overcomes the limitations of single-material adhesives.

Inventive Principle:

Principle #40Composite materials

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 dual adhesive layer system ensures strong adhesion and peel strength across a wide temperature range, enabling effective installation and performance of roofing membranes even at low temperatures.

Implementation Method 1

a UV curable adhesive layer disposed on the first adhesive layer. The UV curable adhesive layer may have a thickness of less than about 4 mils

Methodology Applied

Scientific EffectPhotopolymerisation: Photopolymerisation

Data Source

PatentUS12435250B2Double pass process of making a self adhering roofing membrane with improved adhesion at lower installation temperature

Publication Date: 2025.10.07 JOHNS MANVILLE CORP

AI summary

A self-adhering roofing membrane may include a polymeric membrane. The roofing membrane may include a first adhesive layer disposed on a major surface of the polymeric membrane. The first adhesive layer may include one or both of a hot melt adhesive and a butyl rubber-based adhesive. The roofing membrane may include a UV curable adhesive layer disposed on the first adhesive layer. The UV curable adhesive layer may have a thickness of less than about 4 mils.