Precipitation Polymerized Copolymer for Hydroalcoholic Gel Transparency
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Solution Overview
Problem
Existing hydroalcoholic compositions with polymers based on acrylic acid and 2-acrylamido-2-methylpropane sulfonic acid, obtained by inverse or dispersion polymerization, lack effective rheological properties and transparency in hydroalcoholic gels, particularly in alcohol-rich solutions.
Innovation Solution
A branched or crosslinked copolymer obtained by precipitation polymerization, comprising 20-94.99 mol% of a monomer with an acrylic group and a weak acid function, 5-79.99 mol% of a monomer with a strong acid function, and 0.01-4.0 mol% of a crosslinking agent, using solvents like tert-butanol, which provides improved viscosity and transparency in hydroalcoholic compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If polymers based on acrylic acid and 2-acrylamido-2-methylpropane sulfonic acid are used in hydroalcoholic compositions, then thickening effect is achieved in aqueous medium, but rheological properties and transparency are not effective in hydroalcoholic compositions
Solution Approach 1:
The patent changes the polymerization parameters by using precipitation polymerization in alcohol-rich solvents (50-95% v/v alcohol) instead of aqueous media, and by adjusting the monomer composition ratio (acrylic acid to 2-acrylamido-2-methylpropane sulfonic acid between 1:4 to 4:1) to optimize rheological properties and transparency in hydroalcoholic compositions
Solution Approach 2:
The patent creates a composite polymer system combining acrylic acid and 2-acrylamido-2-methylpropane sulfonic acid monomers with specific molar ratios, forming a copolymer that exhibits synergistic thickening and stabilizing properties in hydroalcoholic compositions, achieving both rheological effectiveness and transparency
2Ease of manufacture
If polymers are obtained by inverse emulsion or dispersion polymerization, then polymer formation is achieved, but transparent hydroalcoholic gel cannot be obtained
Solution Approach 1:
The patent uses alcohol-rich solvents as intermediaries during precipitation polymerization to mediate between the polymerization process and the final gel transparency, allowing the polymer to form while maintaining clarity in the hydroalcoholic composition
Solution Approach 2:
The patent exploits phase transition during precipitation polymerization where the polymer precipitates from the alcohol-rich solvent system, forming a transparent gel network that maintains optical clarity while achieving the desired rheological properties
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 copolymer enhances the viscosity and transparency of hydroalcoholic gels, making them more practical and effective for skin application while maintaining virucidal properties without skin irritation.
Implementation Method 1
The invention also relates to the use of this branched or crosslinked copolymer to thicken a hydroalcoholic composition comprising at least water and at least one alcohol
Implementation Method 2
said copolymer being obtained by precipitation polymerization in a solvent comprising at least one alcohol
Data Source
AI summary
The present invention relates to the use, for the manufacture of an aqueous-alcoholic composition comprising at least water and at least one alcohol, of a branched or crosslinked copolymer obtained from: (i) 20 mol% to 94.99 mol% of at least one monomer comprising an acrylic group and bearing at least one weak acid function, (ii) 5 mol% to 79.99 mol% of at least one monomer bearing of at least one strong acid function, (iii) 0.01 mol% to 4 mol% of a crosslinking/branching agent, said copolymer being obtained by precipitation polymerization, in a solvent comprising at least one alcohol.