Pressure Sensitive Transfer Tape Bleeding Resistance
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Solution Overview
Problem
Pressure sensitive transfer correcting tapes face challenges with bleeding resistance, particularly with oil-based ballpoint pen inks, leading to poor concealment and readability due to the brittleness and low flexibility of the concealing layer, which affects rewriting and printing.
Innovation Solution
Incorporating porous silica with an oil absorption of 100 to 320 ml/100 g and acid-modified rosin with an acid value of 180 mg KOH/g or more into the correcting and covering layer, along with a binder resin like synthetic rubber, to enhance bleeding resistance, flexibility, and coating properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If porous silica with high oil absorption is added to the correcting and covering layer, then bleeding resistance is improved, but the concealing layer becomes brittle and easily breaks down
Solution Approach 1:
The patent optimizes the oil absorption parameter of porous silica to a specific range (200-400 ml/100g) and controls the content ratio of porous silica to binder resin (3:7 to 7:3). This parameter optimization ensures sufficient oil absorption for bleeding resistance while preventing excessive brittleness that would occur with higher silica content or absorption capacity.
Solution Approach 2:
The patent creates a composite concealing layer combining porous silica with specific binder resins (polyester resin, polyacrylic resin, or polyvinylidene fluoride resin) in controlled ratios. This composite structure leverages the oil absorption capability of porous silica while the binder resins provide flexibility and prevent brittleness, resolving the contradiction between bleeding resistance and mechanical strength.
2Reliability
If polyester resin with low flexibility is added to improve bleeding resistance, then ink absorption is enhanced, but coating film followability and crack resistance deteriorate
Solution Approach 1:
The patent specifies precise compositional parameters: binder resin content at 30-70 parts, porous silica at 30-70 parts, and white pigment at 100-300 parts by mass. These parameter controls ensure adequate ink absorption through polyester resin while preventing crack resistance deterioration by limiting resin content and balancing it with silica and pigment proportions.
Solution Approach 2:
The patent employs a multi-component composite system where polyester resin works synergistically with polyacrylic resin or polyvinylidene fluoride resin, porous silica, and white pigments. This composite approach distributes the functional demands: polyester resin provides bleeding resistance, while the other components maintain flexibility and crack resistance, preventing the deterioration associated with polyester resin alone.
3Ease of manufacture
If conventional binder resins and dispersing agents are used in solvent-based correcting and covering layer ink, then coating properties are maintained, but bleeding resistance deteriorates with polar organic solvents
Solution Approach 1:
The patent modifies the chemical parameters of the binder resin by selecting specific resin types (polyester, polyacrylic, or polyvinylidene fluoride) with controlled molecular structures and polarities. These parameter changes enable the binder to effectively interact with polar organic solvents in ballpoint pen ink, preventing bleeding while maintaining coating properties through appropriate resin selection rather than conventional nonpolar binders.
Solution Approach 2:
The patent develops a composite ink formulation combining binder resin, porous silica, white pigment, and solvent. The porous silica component acts as an additional ink-trapping mechanism that works synergistically with the binder resin, enhancing bleeding resistance without compromising coating properties. This composite approach allows the system to handle polar organic solvents effectively while maintaining ease of manufacture.
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 effectively prevents ink bleeding, maintains flexibility and crack resistance, and ensures good coating and rewriting properties, even under high temperature and humidity conditions.
Implementation Method 1
porous silica having a specific oil absorption
Implementation Method 2
concealing layer contains, in addition to the binder resin, porous silica and acid-modified rosin
Data Source
AI summary
Pressure sensitive transfer correcting tape disclosed herein has improved resistance to bleeding from a line drawn with a ballpoint pen or the like. The pressure sensitive transfer correcting tape may include a release substrate including paper or a plastic film and a pressure sensitive transfer layer including at least a correcting and covering layer and a pressure sensitive adhesive layer laminated sequentially on one side of the release substrate. The correcting and covering layer contains porous silica and acid-modified rosin. In some examples, the oil absorption of the porous silica is preferably in a range of from 100 to 320 ml/100 g, and the acid value of the acid-modified rosin is preferably 180 mg KOH/g or more.