Block Copolymer Resin Composition for Heat-Shrinkable Film Adhesion
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Solution Overview
Problem
Existing heat-shrinkable films with adhesive layers are costly and prone to separation due to inadequate interlayer adhesive strength, while films without adhesive layers have insufficient interlayer adhesive strength for practical use.
Innovation Solution
A block copolymer resin composition comprising vinyl aromatic hydrocarbon-conjugated diene block copolymers with specific molecular weight and mass ratios, used in a heat-shrinkable multilayer film with polyester-based front and back layers, providing excellent interlayer adhesive strength without the need for additional adhesive layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive layers are interposed between polyester-based resin layers and polystyrene-based resin layers, then interlayer adhesive strength is improved, but manufacturing cost increases and process complexity increases
Solution Approach 1:
The patent extracts and eliminates the adhesive layer from the laminated film structure. By selecting specific resin combinations (polyester-based resin and polystyrene-based resin with particular glass transition temperatures and molecular weights), the invention achieves adequate interlayer adhesive strength without requiring any adhesive layer, thereby simplifying the overall structure and reducing manufacturing complexity
Solution Approach 2:
The patent utilizes parameter changes in the resin properties, specifically controlling the glass transition temperature (Tg) of the polyester-based resin (50-150°C) and polystyrene-based resin (0-100°C), along with their molecular weights and composition ratios, to achieve optimal interlayer adhesion. By adjusting these parameters, the resins themselves provide sufficient bonding without additional adhesive layers
2Strength
If adhesive layers are interposed between polyester-based resin layers and polystyrene-based resin layers, then interlayer adhesive strength is improved, but manufacturing cost increases
Solution Approach 1:
The invention removes the adhesive layer component entirely from the laminated film structure. By relying on the inherent adhesion between properly selected polyester-based and polystyrene-based resins, the patent eliminates the need to purchase, apply, and process separate adhesive materials, directly reducing manufacturing costs while maintaining structural integrity
Solution Approach 2:
The patent makes the resin layers themselves multi-functional by having them simultaneously provide both structural functions and adhesive functions. The polyester-based and polystyrene-based resins not only form the protective layers but also provide the bonding interface between layers, eliminating the need for dedicated adhesive materials
3Device complexity
If no adhesive layers are interposed between polyester-based resin layers and polystyrene-based resin layers, then structure is simplified, but interlayer adhesive strength becomes inadequate for practical use
Solution Approach 1:
The patent resolves the adhesion issue without adding structure by precisely controlling resin parameters: polyester-based resin with Tg of 50-150°C and polystyrene-based resin with Tg of 0-100°C, along with specific molecular weight ranges and composition ratios. These parameter adjustments ensure the resins provide sufficient interlayer bonding in their simplest form
Solution Approach 2:
The invention creates an effective composite material system by combining polyester-based resin and polystyrene-based resin in specific ratios (70-99.99% and 0.01-30% by weight respectively). This composite approach leverages the complementary properties of both resins to achieve adequate adhesion without requiring additional adhesive layers or structural complexity
4Ease of manufacture
If specific resin combinations are used to achieve interlayer adhesive strength without adhesive layers, then manufacturing cost is reduced, but adhesive performance may be insufficient under practical conditions
Solution Approach 1:
The patent ensures reliable adhesive performance by optimizing resin parameters: polyester-based resin with Tg of 50-150°C, polystyrene-based resin with Tg of 0-100°C, specific molecular weight ranges, and controlled composition ratios. These parameter optimizations guarantee adequate interlayer bonding strength under practical usage conditions while maintaining cost-effectiveness
Solution Approach 2:
The invention uses readily available, cost-effective polyester-based and polystyrene-based resins that provide sufficient performance for practical applications. By selecting commercially accessible resins with appropriate properties rather than expensive specialized adhesives, the patent achieves reliable adhesive performance at lower cost
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 solution achieves a heat-shrinkable multilayer film with interlayer adhesive strength of 0.8 N/15 mm or more, ensuring reliable attachment and heat-shrinkage performance, thereby addressing the limitations of existing technologies.
Implementation Method 1
laminated films that are not interposed by adhesive layers are able to obtain a certain level of interlayer adhesive strength due to the selection of specific resins
Implementation Method 2
A block copolymer resin composition comprising 85 to 99.5 parts by mass of a resin component A and 0.5 to 15 parts by mass of a resin component B; wherein the resin component A contains at least one type of vinyl aromatic hydrocarbon-conjugated diene block copolymer
Implementation Method 3
Heat-shrinkable films made of polystyrene-based resins are widely used in the labels of PET bottle containers
Implementation Method 4
the present invention provides a block copolymer resin composition, a heat-shrinkable multilayer film, a heat-shrinkable label and a beverage container
Data Source
AI summary
[Problem] To provide a block copolymer resin composition that has excellent adhesive performance with respect to polyester-based resins, a heat-shrinkable multilayer film and a heat-shrinkable label. [Solution] A block copolymer resin composition comprising 85 to 99.5 parts by mass of a resin component A and 0.5 to 15 parts by mass of a resin component B; wherein the resin component A contains at least one type of vinyl aromatic hydrocarbon-conjugated diene block copolymer, and a mass ratio between the vinyl aromatic hydrocarbon and the conjugated diene is 80/20 to 65/35; and the resin component B is a vinyl aromatic hydrocarbon-conjugated diene block copolymer or a conjugated diene polymer of which a mass ratio between the vinyl aromatic hydrocarbon and the conjugated diene is 30/70 to 0/100, and the number-average molecular weight is 5,000 to 40,000.