Acrylic Comb Polymer Paper Coating Formulation
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Solution Overview
Problem
The existing processes for manufacturing paper coatings are complex and expensive due to the need for multiple additives to optimize rheological and optical properties, and they struggle to achieve high Brookfield viscosity without compromising stability and handling properties.
Innovation Solution
A process involving the partial neutralization of a comb polymer with alkoxy and/or hydroxy polyalkylene glycol functions, mixed with an acrylic thickener, to create a stable aqueous formulation with controlled pH and dry matter content, achieving improved rheological and optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple additives (thickeners, water retaining agents, gloss activators) are used to optimize rheological and optical properties, then the coating sauce achieves desired performance, but the manufacturing process becomes complex and expensive
Solution Approach 1:
The patent combines multiple functional additives (thickener and water retaining agent) into a single copolymer molecule. The comb-like structure contains both hydrophobic thickening segments and hydrophilic water-retaining segments, allowing one additive to perform multiple functions that previously required separate components.
Solution Approach 2:
The copolymer is designed with multi-functionality, simultaneously providing thickening, water retention, and optical properties. The molecular structure includes functional groups that enable it to act as both a thickening agent and a water retaining agent, reducing the number of separate additives needed.
2Object-affected harmful factors
If high Brookfield viscosity is achieved through multiple additives, then rheological properties are optimized, but stability and handling properties deteriorate
Solution Approach 1:
The patent optimizes the molecular parameters of the copolymer, including the ratio of hydrophobic to hydrophilic segments, molecular weight, and compositional distribution. By carefully controlling these parameters, the formulation achieves high viscosity while maintaining stability and handling properties.
Solution Approach 2:
The copolymer functions as a composite material at the molecular level, combining different functional segments (hydrophobic and hydrophilic) within a single polymer chain. This composite structure enables simultaneous achievement of high viscosity and good stability.
3Stability of the object's composition
If vigorous stirring is used to homogenize coating sauce components, then mixing efficiency is improved, but energy consumption increases
Solution Approach 1:
The copolymer is pre-synthesized with its final comb-like structure before being added to the coating sauce. This preliminary formation of the multi-functional structure eliminates the need for vigorous mixing to achieve functional homogeneity, as the additive is already in its optimal configuration.
Solution Approach 2:
The copolymer's molecular structure enables it to self-organize and self-distribute uniformly in the coating sauce without requiring intensive mechanical mixing. The amphiphilic nature of the comb structure promotes spontaneous dispersion and homogeneous distribution.
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 process results in a stable, easily handleable coating sauce with increased water retention and Brookfield viscosity, maintaining excellent optical properties and handling characteristics.
Implementation Method 1
the comb polymer is partially neutralized during step a) and/or step c), so as to obtain a mixture whose pH is between 5.5 and 6.8
Implementation Method 2
We then seek to reduce this migration of water and water-soluble substances as much as possible, with a view to avoiding a change in the rheology of the coating sauce not used and recycled in the coating process. We then talk about the phenomenon of water retention which we seek to improve
Implementation Method 3
agents known under the name 'thickeners' are used in said sauces... acrylic thickeners of the ASE type (Alkali Swellable Emulsion or alkali soluble emulsion) and HASE (Hydrophobically modified Allcali Swellable Emulsion)
Implementation Method 4
the combination of optical brighteners (fluorescent substances based on stylbene molecules) with brightening supports such as acrylic polymers
Data Source
AI summary
The invention relates to a method for preparing a composition, characterised in that it comprises the steps of: a) preparing an aqueous solution of at least one comb polymer of (meth)acrylic acid having an alkoxy and/or hydroxy polyalkylene glycol function grafted thereon; b) preparing an aqueous emulsion of at least one acrylic thickener; c) mixing the aqueous solution of step a) and the aqueous emulsion of step b) with the optional addition of water; and in that it comprises partially neutralising the comb polymer during step a) and/or step c) in order to obtain a mixture having a pH between 5.5 and 6.8, preferably between 5.8 and 6.3. The invention also relates to the product thus obtained and to the use thereof in a paper coating slip as a thickening agent for said slip and/or as a water retention agent for said slip and/or as an agent for improving the gloss and/or the optical azuration of the paper coated with said slip.