Polysiloxane conjugates as fragrance delivery systems
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Solution Overview
Problem
The perfume industry faces challenges in achieving prolonged and improved olfactory performance from perfuming ingredients due to volatility and poor substantivity, with existing polymer-based solutions offering modest performance and unsatisfactory dispersion and deposition.
Innovation Solution
Development of polysiloxane conjugates with a β-thio carbonyl moiety capable of releasing odoriferous molecules like α,β-unsaturated ketones or aldehydes, which are designed to provide controlled and enhanced fragrance release while maintaining flowable properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If polymer-based ingredients are used to prolong the effect of active ingredients, then the duration of action is improved, but the release properties remain modest
Solution Approach 1:
The invention uses styrene co-polymer combined with specific monomeric derivatives (isobornyl 2-mercapto-2-methylpropanoate and/or 3-mercaptopropyltrimethoxysilane) to create a composite fragrance delivery system. This composite approach allows the polymer matrix to provide prolonged release while the specific monomeric components enhance the release properties, resolving the contradiction between duration and release efficiency.
2Manufacturing precision
If non-flowable crosslinked siloxane-based polymers are used to improve deposition, then the deposition performance is improved, but the dispersion becomes poor
Solution Approach 1:
The invention changes the flowability parameter of siloxane-based polymers by adjusting crosslinking density and molecular weight, transforming non-flowable polymers into flowable forms. This parameter change maintains the deposition capability while improving dispersion properties, allowing the polymer to be effectively applied without aggregation issues.
3Productivity
If chemical binding of polymers to surface is promoted to improve fragrance delivery, then the fragrance delivery is improved, but the target surface is modified
Solution Approach 1:
The invention introduces siloxane-based polymers as intermediary carriers between the fragrance molecules and the target surface. These polymers provide physical adsorption sites that enable fragrance delivery without requiring direct chemical bonding to the surface, thus maintaining surface integrity while achieving effective fragrance release.
4Quantity of substance
If standard free oil or commercial monomeric profragrances are used, then the fragrance intensity is maintained, but the flowable properties and substantivity are insufficient
Solution Approach 1:
The invention applies local quality by incorporating specific functional groups (mercapto groups) at specific positions within the polymer structure. This localized functionalization enhances both the flowable properties through molecular design and the substantivity through targeted interactions, while maintaining fragrance intensity released from these specific sites.
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 polysiloxane conjugates demonstrate superior performance compared to free active molecules and prior art polymers, offering improved fragrance release and substantivity, ensuring prolonged odor benefits in perfumery applications.
Implementation Method 1
polysiloxane conjugates with a β-thio carbonyl moiety capable of releasing odoriferous molecules like α,β-unsaturated ketones or aldehydes
Data Source
AI summary
The present invention relates to the field of perfumery. More particularly, it concerns polymers derived from siloxane derivatives and comprising at least one β-thio carbonyl moiety capable of liberating an active molecule such as, for example, an α,β-unsaturated ketone or aldehyde. The present invention concerns also the use of polymers in perfumery as part of a perfuming or malodor counteracting composition as well as the perfuming compositions or perfumed articles comprising the invention's compounds.