Curable Silicone Composition for Release Liners
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Solution Overview
Problem
Conventional release liners exhibit undesirably low release force, leading to undesirable dispensing of labels in hand peel applications, as they rely on addition-curable silicone compositions that do not provide sufficient release properties.
Innovation Solution
A curable composition comprising a branched organopolysiloxane polymer and a silicone resin with specific molecular structures and weight percentages, combined with an organosilicon compound and a hydrosilylation catalyst, to form films with enhanced release properties, including high release force at low peel speeds and low release force at high peel speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional addition-curable silicone compositions are used to form release liners, then the manufacturing process is simple and straightforward, but the release force is undesirably low leading to label dispensing issues
Solution Approach 1:
The patent changes the chemical parameters of the silicone composition by incorporating specific branched organopolysiloxane structures with controlled molecular weights and functionality ratios. This modifies the physical and chemical properties of the cured film to achieve optimal release force characteristics that prevent label dispensing while maintaining ease of manufacture
Solution Approach 2:
The invention creates a composite silicone composition system combining branched organopolysiloxane, linear organopolysiloxane, and crosslinking agents in specific ratios. This composite approach allows the material to exhibit both adequate adhesion for label holding and controlled release properties, resolving the contradiction between release force and label dispensing control
2Force
If high release force is achieved to prevent label dispensing, then label security is improved, but release at desired locations becomes difficult
Solution Approach 1:
The patent formulates the silicone composition to create a release liner with dynamic release characteristics. The branched organopolysiloxane structure provides base adhesive strength, while the specific composition ratios enable the release force to respond dynamically to applied stress, allowing secure holding during normal use but controlled release when force is applied at the desired location
3Reliability
If conventional silicone compositions are used, then material selection is simple and cost-effective, but the films lack sufficient release properties for hand peel applications
Solution Approach 1:
The patent systematically adjusts key parameters of the silicone composition including molecular weight distribution, branch frequency, functionality ratios, and crosslinking density. These parameter changes transform conventional silicone material into a high-performance release liner composition that provides reliable release properties while maintaining reasonable compositional complexity through standardized formulation approaches
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 effectively addresses the low release force issue by forming films with improved release properties, ensuring secure label removal without unintended dispensing, even at varying peel speeds.
Implementation Method 1
conventionally formed by addition reacting an organopolysiloxane having an unsaturated hydrocarbon group and an organohydrogenpolysiloxane in the presence of a hydrosilylation reaction catalyst
Data Source
AI summary
An (A) additive organopolysiloxane composition is disclosed which comprises (A1) a branched organopolysiloxane polymer comprising M, D and Q siloxy units and (A2) a silicone resin. The (A) additive organopolysiloxane composition has a content of aliphatically unsaturated groups of from 1.5 to 7.0 wt.%. A curable composition is also disclosed, the curable composition comprising the (A) additive organopolysiloxane composition, (B) an organosilicon compound having at least two silicon-bonded hydrogen atoms per molecule, and (C) a hydrosilylation catalyst. A method of preparing the curable and a method of forming a film with the curable composition are also disclosed.