Aqueous Coating Composition With Low-pH Microbial Resistance
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Solution Overview
Problem
Existing aqueous-based coatings are susceptible to microbial contamination, particularly in manufacturing processes and subsequent storage in the retail container. These coatings are inherently susceptible to microbial contamination, particularly in the manufacturing processes and subsequent storage in the retail container. These coatings are inherently susceptible to microbial contamination, which can lead to significant quantities of preservatives. There is a risk that the biocides used can trigger allergic reactions. Furthermore, high pH values, such as 11.5 or 12.0, are used to prevent mold growth, but handling these coatings can cause skin irritation, and adapted microorganisms can necessitate more frequent cleaning of equipment or components during production.
Innovation Solution
An aqueous coating compound is developed with a pH value between 3.0 to 6.5, preferably 4.5 to 6.0, containing specific excipients like glyceryl caprylate, caprylhydroxamic acid, cinnamic acid, amino alcohols, and N,N,N',N'-tetra-(hydroxyalkyl)alkylenediamine, along with a buffer system to maintain pH stability and resist microbial infestation without conventional preservatives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high pH values (11.5-12.0) are used to prevent mold growth, then microbial resistance is improved, but skin irritation and equipment cleaning frequency increase
Solution Approach 1:
The patent changes the pH parameter from conventional high values (11.5-12.0) to a lower range (9.0-11.0), combining this parameter change with the introduction of specific preservative substances to achieve microbial resistance without the harmful effects of extremely high pH
Solution Approach 2:
The patent introduces preservative substances (isothiazolinones, benzisothiazolinone, or organic acids) as intermediary agents that provide microbial resistance, allowing the pH to be reduced to a safer range while maintaining protection against mold and bacteria
2Reliability
If high pH values (11.5-12.0) are used to prevent mold growth, then microbial resistance is improved, but equipment cleaning frequency and labor expenditure increase
Solution Approach 1:
By optimizing the pH parameter to a lower range (9.0-11.0) and combining it with specific preservative substances, the patent reduces the need for frequent equipment cleaning while maintaining microbial resistance, thereby improving production efficiency
Solution Approach 2:
Preservative substances serve as mediators that provide effective microbial protection at lower pH values, eliminating the need for extreme pH conditions that would require frequent cleaning and reducing labor expenditure
3Reliability
If conventional preservatives are used to prevent microbial contamination, then microbial resistance is improved, but allergic reactions may occur
Solution Approach 1:
The patent modifies the chemical composition by selecting preservative substances with lower allergenic potential (isothiazolinones, benzisothiazolinone, or organic acids) and adjusts the pH to a milder range, reducing the risk of allergic reactions while maintaining microbial resistance
Solution Approach 2:
The patent uses alternative preservative substances as intermediary agents that provide microbial protection with reduced allergenicity compared to conventional biocides
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 coating compositions effectively resist microbial attack for an extended period, reducing the risk of skin irritation and allergic reactions, while maintaining application properties and opacity without relying on organic preservatives, even in the presence of fungal and bacterial infections.
Implementation Method 1
containing a buffer system to maintain pH stability
Implementation Method 2
the aqueous coating compositions according to the invention can withstand microbial attack for a longer period of time
Data Source
AI summary
The invention relates to an aqueous coating composition comprising a) a thickener, b) a polymeric organic binder, c) an excipient such as glyceryl caprylate, 2-amino-2-ethyl-1,3-propanediol, or N,N,N',N'-tetra(hydroxyalkyl)alkylenediamine, d) at least one additive, and e) water, wherein the composition has a pH value in the range of 3.0 to 6.5 or is adjusted to a pH value in the range of 3.0 to 6.5. Furthermore, the invention relates to the use of the aqueous coating composition according to the invention for the manufacture of, or as a component thereof, interior paint, varnish, clear varnish, filler, adhesive, plaster, facade paint, primer, or pigment paste, as well as interior paints, facade paints, varnishes, clear varnishes, fillers, adhesives, plasters, primers, or pigment pastes containing or formed from the aqueous coating composition according to the invention.Furthermore, the invention relates to a method for determining the acid reserve of pigments or fillers and to a water-based paint.