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Mixtures comprising Merocyanines and Benzotriaoles

IP.com Disclosure Number: IPCOM000248236D
Publication Date: 2016-Nov-10

Publishing Venue

The IP.com Prior Art Database

Abstract

This publication discloses the use of a Light stabilizer blend of a merocyanine and Tinogard TL to protect a large variety of Home and Personal Care products containing new fragrances and actives in many colorful formulations displayed in transparent and translucent packaging especially in the area of cleaning and rinse off products

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Light Stabilizer Blend

Mixtures comprising Merocyanines and Benzotriaoles

Since consumers can choose from a large variety of Home & Personal Care products, producers need to communicate clearly how their brands are unique. Sophisticated products containing new fragrances and actives in many colourful formulations, displayed in transparent and translucent packaging are very common, especially in the area of cleaning and rinse off products.

It is mandatory for commercial success that the pleasant appearance, product efficacy and the fresh smell of a consumer product will last during its whole product life cycle even when exposed heavily to UV-light. This exposure can result in decomposition processes, often seen as color fading, color shifts, discoloration, destruction of overall product appearance, loss of activity due to decomposition of active ingredients, loss of fragrances, change in odor, off-flavor development, viscosity changes, phase separation, precipitation, etc.

Various stabilization techniques of clear packaged products by absorption of UV light are commonly used and well known. This are typically referred to as UV light stabilizers, indicating their action by means of absorption in the UV range. For example broad-band UV light stabilizer of the benzotriazole class enhance product's stability and shelf live due to their very good UV-A and UV-B absorption properties.

The most effective stabilizers known as of today to prevent or delay light induced fading of transparent packaged products are e.g. benzotriazoles like known under the trade names BASF TINOGARD HS or BASF TINOGARD TL. These proved to be very effective, due to their broadband absorption properties and strong extinction in the UV-A range.

It was now found that the combination of specific merocyanine derivatives, which have an absorption maximum in the range of 350 to 400 nm, in combination with a benzotriazole, and optionally in presence of other UV filters, have outstanding stabilizing properties. To facilitate homogeneous blending, such combinations may further also contain a solvent.

The UV stabilizers blend presented here contains following preferred ingredients:

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Light Stabilizer Blend

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Table 1: Example of preferred Merocyanine

(MC-01)

Table 2: Example of preferred benzotriazole

H C12H25

O

BT-01

 N N

N

CAS-No.: 125304-04-3

Very good results can be achieved when compounds MC-01 and BT-01 are blended together in a solvent system as follows:

Stabilizer Blend SB-01:
MC-01: 4% to 6%

BT-01: 16% to 24%

Triethanolamine: 0.05 to 0.2%

Butyl Triglycol: 69.8% to 79.95%%
(where Butyl Triglycol is a blend of Triethylene glycol monobutyl ether CAS N° 143-22-6 and of Tetraethylene glycol monobutyl ether CAS N° 1559-34-8).

Stabilizer Blend SB-01 may be used stand-alone, or in mixture with other stabilizers (excited state quencher, antioxidants, hindered amines, other UV light stabilizers), in particular for bath and shower additives...