Metathesized Polyol Ester Lubricant for Razor Cartridges
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Solution Overview
Problem
Current shaving aids with polyethylene oxide polymers face limitations in lubrication performance due to issues like residue, stringiness, and viscosity, which negatively impact the shaving experience, and commercially available metathesized unsaturated polyol esters have rheological issues leading to inadequate spreading and poor lubrication.
Innovation Solution
A lubricating member for razor cartridges comprising 1 to 99% by weight of metathesized unsaturated polyol esters with specific molecular weight and iodine value ranges, which provide improved skin conditioning and lubrication benefits while being tolerant to high pH conditions and synergistic with cationic polymeric materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If polyethylene oxide polymers are used as lubricants, then lubrication is provided during shaving, but residue and stringiness occur negatively impacting performance
Solution Approach 1:
The patent changes the chemical parameters of the lubricating material by using metathesized unsaturated polyol esters with specific molecular weights (2,000-50,000 Da) and iodine values (30-200), replacing conventional polyethylene oxide polymers. This parameter change resolves the contradiction by providing lubrication without the harmful residue and stringiness effects of PEO.
Solution Approach 2:
The patent employs composite material strategy by combining metathesized unsaturated polyol esters with water-soluble polymers in a lubricating member system. This composite approach allows the polyol ester to provide lubrication while the water-soluble polymer matrix manages residue control, resolving the contradiction between lubrication performance and harmful residue generation.
2Ease of operation
If high molecular weight polyethylene oxide is used to improve lubrication, then lubrication performance improves, but viscosity increases negatively impacting user perception
Solution Approach 1:
The patent changes the molecular weight parameter of the lubricating material to 2,000-50,000 Da, which is significantly lower than high molecular weight PEO. This parameter change provides adequate lubrication performance while maintaining lower viscosity that does not negatively impact user perception during shaving.
3Ease of operation
If commercially available metathesized unsaturated polyol esters are used, then lubrication is provided, but rheological issues cause insufficient or excessive spreading leading to poor lubrication
Solution Approach 1:
The patent optimizes the rheological parameters by selecting metathesized unsaturated polyol esters with specific molecular weights (2,000-50,000 Da) and iodine values (30-200). These parameter specifications ensure proper spreading characteristics and rheological stability, resolving the contradiction between providing lubrication and controlling spreading behavior.
Data Source
AI summary
The invention relates to a lubricating member for a razor cartridge comprising a metathesized unsaturated polyol ester for improved lubrication.