SEBS Removable Adhesive Prevents Oil Bleeding

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Solution Overview

Problem

Existing removable pressure sensitive adhesives face challenges such as the use of heavy metal salts, high diblock content leading to weak adhesives, and issues with oil bleeding, which affect their performance and processing difficulties.

Innovation Solution

A removable pressure sensitive adhesive composition using a styrene-isoprene-styrene block copolymer with a high styrene content, low diblock content, and a melt flow index, combined with a tackifying resin and a limited amount of liquid plasticizer, to achieve a strong yet clean removable bond without heavy metal salts and oil bleeding.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If SIS or SBS block copolymers are used to form pressure sensitive adhesives, then the adhesive readily forms a pressure sensitive bond, but the adhesive bleeds oil into the substrate

Engineering Contradiction:

Improvereadily forms pressure sensitive adhesiveVSAvoidoil bleeding into substrate

Core Design Contradiction:

Ease of manufactureVSObject-generated harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters by using styrene-ethylene/propylene-styrene block copolymer instead of SIS or SBS, and adjusts the plasticizer content to 5-40% by weight to prevent oil bleeding while maintaining pressure sensitive adhesive properties

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite adhesive formulation combining styrene-ethylene/propylene-styrene block copolymer with specific plasticizers and tackifying resins to achieve both pressure sensitivity and oil resistance

Inventive Principle:

Principle #40Composite materials

2Object-generated harmful factors

If SEBS or SEEPS block copolymers are used, then the adhesive holds plasticizing oil well and prevents bleeding, but the adhesive does not readily form pressure sensitive adhesives and requires hot lamination

Engineering Contradiction:

Improveprevents bleeding of oil into substrateVSAvoidreadily forms pressure sensitive adhesive

Core Design Contradiction:

Object-generated harmful factorsVSEase of manufacture

Solution Approach 1:

The patent selects styrene-ethylene/propylene-styrene block copolymer with specific molecular weight and composition parameters that enable both oil holding capacity and pressure sensitive adhesive formation at room temperature, eliminating the need for hot lamination

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If a high amount of plasticizing oil is used to achieve removability, then the adhesive peels cleanly from substrate, but the adhesive bleeds oil into the substrate

Engineering Contradiction:

Improvepeels cleanly from substrateVSAvoidbleeds oil into substrate

Core Design Contradiction:

Ease of operationVSObject-generated harmful factors

Solution Approach 1:

The patent optimizes the plasticizer content to 5-40% by weight and selects specific plasticizer types that provide sufficient lubricity for clean removal while maintaining low enough oil content to prevent bleeding into the substrate

Inventive Principle:

Principle #35Parameter changes

4Strength

If heavy metal salts are used in the adhesive composition, then the adhesive achieves strong bonding, but the adhesive creates environmental and health concerns

Engineering Contradiction:

Improvebonding strengthVSAvoidheavy metal content

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent replaces heavy metal salts with organic-based tackifying resins and block copolymer formulations that provide equivalent bonding strength without the environmental and health hazards of heavy metals

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent creates a heavy metal-free composite adhesive system combining styrene-ethylene/propylene-styrene block copolymer with organic tackifiers and plasticizers to achieve strong bonding without harmful substances

Inventive Principle:

Principle #40Composite materials

Data Source

PatentEP3431563B1Removable pressure sensitive adhesive compositions

Publication Date: 2022.05.04 TRIMURTI HLDG CORP

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AI summary

This invention relates to styrene-isoprene-styrene block copolymer based on hot melt adhesive compositions. The adhesive compositions are useful for making removable pressure sensitive adhesives. The adhesives have a peel value of no greater than 4 lbs/in. Additionally, the tack value can be equal to or greater than the peel value. The compositions use a minimal amount of liquid plasticizer and/or tackifying resin. Additionally, the adhesives have workable viscosity despite a high loading of polymer.