Polybutene-1 PSA with Dual Tackifiers for Reclosable Packaging
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Solution Overview
Problem
Polybutene-1 (co)polymers-based pressure sensitive adhesives (PSAs) exhibit mediocre adhesion to substrates like PE or PET, particularly in initial adhesion and reclosability, and insufficient viscosity for reclosable packaging applications.
Innovation Solution
Incorporating both a liquid and a solid tackifier into the PSA composition, which enhances adhesion, flexibility, and film-forming characteristics, while maintaining suitable viscosity for extrusion forming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single solid tackifier is used in polybutene-1 (co)polymer-based PSA, then the adhesive composition is simple, but the adhesion to substrates like PE or PET is mediocre in initial adhesion and reclosability
Solution Approach 1:
The patent combines polybutene-1 (co)polymer with both liquid and solid tackifiers to create a composite adhesive system. This composite approach allows the liquid tackifier to provide initial adhesion to non-polar substrates while the solid tackifier maintains structural integrity and enables reclosability, resolving the contradiction between composition simplicity and adhesion performance.
2Reliability
If polybutene-1 (co)polymer-based PSA is used for reclosable packaging, then the adhesive provides basic bonding, but the viscosity is insufficient for proper application in manufacture steps
Solution Approach 1:
The patent modifies the viscosity parameter of the adhesive by incorporating liquid and solid tackifiers in specific proportions. The liquid tackifier reduces viscosity to enable proper application during manufacturing, while the solid tackifier ensures the adhesive maintains sufficient viscosity for reclosable packaging functionality, thus resolving the contradiction between reclosable functionality and ease of manufacture.
3Reliability
If PSA is designed for good adhesion, then the adhesive bonds well to substrates, but the flexibility at cold temperatures deteriorates
Solution Approach 1:
The patent applies local quality by using different tackifiers with distinct properties: the liquid tackifier provides strong adhesion to substrates, while the solid tackifier maintains flexibility at cold temperatures. This spatial and functional differentiation within the adhesive composition allows simultaneous achievement of strong adhesion and cold-temperature flexibility.
Data Source
AI summary
The present invention relates to a pressure sensitive adhesive composition comprising,i) at least one butene-1 (co)polymer;ii) at least one liquid tackifier;iii) at least one solid tackifier;iv) optionally at least one further (co)polymer, different from i);v) optionally at least one additive.Furthermore, the use of the pressure sensitive adhesive composition according to the invention as closing mean for a packaging unit for foods, for packaging units to be heated in a microwave or oven, for a closing mean for packaging unit for drugs, hygienic tissues, cleaning tissues or cosmetic tissues. An article comprising the pressure sensitive adhesive composition according to the invention and a method of obtaining the article.