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Polyamide compositions for personal care

一种个人护理、聚酰胺的技术，应用在含聚酰胺的浓缩液和乳液领域

Inactive Publication Date: 2014-05-07
CRODA INT PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing polymers in sunscreen sprays cannot be applied in amounts that overcome these properties and still provide a better film when sprayed on the skin

Method used

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  • Polyamide compositions for personal care
  • Polyamide compositions for personal care
  • Polyamide compositions for personal care

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0067] Preparation of Hydrophobic Polyamides: General Procedure

[0068] The polyamides used in the examples and comparative examples of the present invention were prepared by the following methods.

[0069] The reactants listed in Table 1 and Table 2 were combined and stirred to produce a homogeneous mixture. The reaction temperature was gradually increased to 220°C, and the heating was continued for 4-6h while removing the water of reaction. The progress of the reaction is monitored by periodic sample analysis for acid number and / or amine number. Polyamides A-H, J and K were used to prepare compositions according to the invention, while polyamides L, M, N, P and Q were used to prepare comparative compositions.

[0070] Alcohol Compatibility:

[0071] Evaluation of polyamide resins for their potential as film formers for ethanol-based continuous sunscreen sprays. Ethanol SD-40 (200proof, 48 grams) and polyamide resin (2.0 g) were mixed and heated to reflux on a hot plate....

Embodiment 1

[0081] Ethanol-Based Spray Sunscreen (SPF70): The Room-Temperature Method

[0082] In a vessel, the components indicated for phase A (see below) were mixed and heated to ~45°C with stirring until the solid actives (avobenzone and benzophenone-3) dissolved and formed a homogeneous solution. Phase A was then cooled to ~40°C. Separately, the Phase B components (30:70 hydrophobic polyamide / ethanol blend, ethanol and glycerin) were combined and blended at room temperature. Phase A was then added to Phase B with stirring and blended to form a clear solution.

[0083]

[0084]

Embodiment 3

[0090] Ethanol-Based Spray Sunscreen (SPF70): The Hot Method

[0091] In a vessel, combine the components indicated for Phase A (see below) and heat to ~85°C with stirring. The solution was mixed until the polyamide melted and incorporated into the organic active oil phase. Phase A was then cooled to ~40°C. The mixture of phase B, ethanol and glycerin was then added to phase A, and the mixture was mixed at room temperature until a clear homogeneous solution was obtained.

[0092]

[0093]

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PUM

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Abstract

Polyamide compositions useful for personal care are disclosed, including film-forming concentrates and emulsions. Ethanol-based concentrates comprise a hydrophobic polyamide, which comprises a reaction product of either (a) a dimerized fatty acid, at least one C2 -C4 carboxylic acid, and a polyamine component comprising ethylenediamine and 1 to 30 eq. % of one or more di- or triamines; or (b) a dimerized fatty acid, at least 50 wt.% of a C16-C22 unsaturated carboxylic acid, and at least one C2-C6 diamine. Personal care applications for the concentrates, including continuous sunscreens, fragrant body sprays or splashes, anti-acne medications, are included. Water-in-oil emulsions comprising the hydrophobic polyamides are storage-stable and provide water-resistant SPF for products such as sunscreens and body lotions.

Description

technical field [0001] The present invention relates to compositions useful for personal care and other applications, and in particular to polyamide-containing concentrates and emulsions. Background technique [0002] Waterless sprays for personal care have become popular in recent years due to their ease of application, being transparent and distributing on the skin without rubbing. Most personal care sprays use ethanol as a thinner. Although ethanol-based continuous sunscreen sprays have been known in some form since the early 1970's (see eg US Pat. No. 3,895,104), they are relatively new to the market. Because consumers love using them, the spray increases overall sunscreen application and reduces the incidence of sunburn and UV exposure. But existing formulations may have disadvantages such as skin tightening, odor or limited persistence on the skin; these disadvantages are attributed to the film-forming polymers applied in the spray. [0003] Polyamides and other syn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K8/18A61Q17/00C08G69/00
CPCC08G69/34C08L77/08C08G69/265A61K8/34A61Q17/04A61K8/88A61K47/34A61Q5/06A61Q5/12A61Q13/00A61Q15/00
Inventor N·哈尔曼G·米勒T·方塔纳N·克尔霍夫J·罗特豪斯R·沙斯特里
Owner CRODA INT PLC
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