Silicone-Modified Tackifier for Pressure Sensitive Adhesive Guillotinability

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Solution Overview

Problem

Pressure sensitive adhesive (PSA) laminates face issues with guillotinability, as the adhesive can flow and smear during cutting, leading to aesthetic and functional problems like glue balls and increased maintenance needs, despite attempts to incorporate silicone compounds.

Innovation Solution

A silicone-modified tackifier is developed, comprising a reaction product of reactive silicone and tackifier, used in a pressure sensitive adhesive composition that includes 5-90 weight percent of this silicone-modified tackifier, along with a polymer latex and other additives, to improve guillotinability and adhesion while preventing adhesive smearing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional pressure sensitive adhesive is used, then good adhesion to substrates is achieved, but adhesive smearing and glue ball formation occur during guillotine cutting

Engineering Contradiction:

Improveadhesion to substratesVSAvoidadhesive smearing and glue ball formation

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent modifies the adhesive composition by incorporating silicone-modified tackifier and specific silicone compounds, changing the chemical parameters of the adhesive to reduce smearing while maintaining adhesion. The silicone content (0.1-10 wt%) and specific composition ratios are optimized to achieve non-smearing properties during guillotine cutting.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite adhesive system combining acrylic polymer, silicone-modified tackifier, and reactive silicone compounds. This composite formulation leverages the complementary properties of each component: acrylic provides adhesion, while silicone components provide non-smearing characteristics during cutting.

Inventive Principle:

Principle #40Composite materials

2Reliability

If adhesive is applied in high quantity, then good adhesion is achieved, but adhesive smearing increases during cutting

Engineering Contradiction:

ImproveadhesionVSAvoidadhesive smearing

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent optimizes the adhesive composition parameters including silicone content (0.1-10 wt%), tackifier content (10-50 wt%), and polymer content (40-80 wt%) to achieve the desired balance between adhesion and non-smearing properties during guillotine cutting.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If guillotine cutting is performed frequently, then production efficiency is maintained, but knife blade cleaning frequency increases

Engineering Contradiction:

Improveproduction efficiencyVSAvoidmaintenance time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The silicone-modified adhesive composition provides self-cleaning properties during the cutting process, where the non-smearing characteristics prevent adhesive buildup on the knife blade, reducing the frequency of manual cleaning interventions and maintaining continuous production.

Inventive Principle:

Principle #25Self-service

4Object-generated harmful factors

If silicone compounds are added to adhesive, then non-smearing properties are improved, but adhesion to difficult substrates may be compromised

Engineering Contradiction:

Improveadhesive smearingVSAvoidadhesion to difficult substrates

Core Design Contradiction:

Object-generated harmful factorsVSReliability

Solution Approach 1:

The patent formulates a composite adhesive system where silicone-modified tackifier and reactive silicone compounds work synergistically with acrylic polymer to maintain adhesion to difficult substrates while providing non-smearing properties during cutting.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent optimizes the specific composition parameters including the type and amount of silicone compound (0.1-10 wt%), tackifier content (10-50 wt%), and polymer content (40-80 wt%) to achieve the desired balance between non-smearing properties and adhesion to difficult substrates.

Inventive Principle:

Principle #35Parameter changes

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 silicone-modified tackifier composition enhances guillotinability, maintains comparable adhesion to difficult substrates, and reduces adhesive smearing and glue ball formation, resulting in improved processing efficiency and reduced maintenance needs.

Implementation Method 1

A silicone-modified tackifier is provided, which is the reaction product of reactive silicone reacted with first tackifier

Methodology Applied

Scientific EffectChemical Bonding: Chemical Bonding

Data Source

PatentUS8338515B1Silicone-modified tackifier and use thereof in pressure sensitive adhesive compositions and laminates with improved guillotinability

Publication Date: 2012.12.25 DT IP HLDG

AI summary

A pressure sensitive adhesive composition including silicone-modified tackifier. The silicone-modified tackifier is produced by reacting reactive silicone with tackifier. Laminates made with the pressure sensitive adhesive have improved guillotinability.