Olefin wax, silicone-modified olefin waxes, silicone-base cold-setting compositions made by using the same, and cosmetics containing the same

Abstract

An olefin wax (A) is (i) a copolymer (A1) obtained by copolymerizing ethylene and at least one diene or a copolymer (A2) obtained by copolymerizing ethylene, at least one olefin selected from α-olefins of 3 to 12 carbon atoms and at least one diene; wherein (ii) the content of unsaturated groups per one molecule is in the range of 0.5 to 3.0 groups; (iii) the density is in the range of 870 to 980 kg / m3; (iv) the melting point is in the range of 70 to 130° C.; (v) the number-average molecular weight is in the range of 400 to 5,000; and (vi) the ratio (Mw / Mn) of the weight-average molecular weight to the number-average molecular weight is not more than 4.0. A silicone-modified olefin wax can be obtained by reacting hydrogen silicone with the olefin wax (A). Cosmetics contain the silicone-modified olefin wax.

Description

TECHNICAL FIELD [0001] The present invention relates to an olefin wax and a silicone-modified olefin wax obtained from the olefin wax. The invention also relates to a silicone-modified room temperature-solidifying composition containing the silicone-modified olefin wax, and to cosmetics using the silicone-modified olefin wax and / or the silicone-modified room temperature-solidifying composition. More particularly, the invention relates to cosmetics containing a specific silicone-modified olefin wax and thereby giving lightly-spreading feeling and refreshing feeling when used; having strong repellency against sweat and water; having excellent effects that softness, smoothness, emollient effect and natural gloss are imparted by paining; and having favorable temporal stability. BACKGROUND OF THE INVENTION [0002] In the syntheses of silicone-modified olefin waxes, use of various polyethylene oligomers, such as polyethylene oxide wax, acid anhydride-modified polyethylene wax and polyethyl...

AI Technical Summary

Benefits of technology

[0007] It is an object of the present invention to provide an olefin wax, which is employable for synthesizing a silicone-modified olefin wax, and a high-purity silicone-modified polyolefin wax obtained by the reaction of the olefin wax with hydrogen silicone. It is another object of the invention to provide cosmetics containing the silicone-modified polyolefin wax. By virtue of inclusion of the silicone-modified polyolefin wax, the cosmetics give lightly-spreading feeling and refreshing feeling when used, specifically, they are free from tackiness and heaviness (heavy to the touch) when painted, are dry and spread lightly, and the skin after painted is dry and smooth to the touch. Further, the cosmetics have strong repellency against sweat and water, have excellent usability, specifically, ability of imparting softness, smoothness, emollient effect and natural gloss without impairing moderate transpiration of moisture by paining, and have favorable temporal stability. SUMMARY OF THE INVENTION

Problems solved by technology

In case of use of the polyethylene oxide wax, however, there is a disadvantage that a homogeneous silicone-modified polyethylene wax cannot be obtained even if the polyethylene oxide wax is modified with silicone, because the number of carboxyl groups in one molecule of the wax is 1 or less.

In this case, however, since a polyethylene wax containing plural double bonds is used as an addition-reaction raw material in the addition reaction, there is a disadvantage that unless expensive hydrogen silicone having only one SiH bond in one molecule is used as hydrogen silicone to be reacted with the polyethylene wax, the silicone wax obtained after the reaction is crosslinked to gel.

In case of use of the polyethylene oligomer having a carboxyl group at one terminal, there is a disadvantage that a silicone-modified polyethylene wax of high purity cannot be obtained because the polyethylene oligomer usually has a low purity of about 80%, and there is a disadvantage that a high-purity polyethylene oligomer having a carboxyl group at one terminal has a low molecular weight of about 400, so that if such a polyethylene oligomer is used, performance of a wax is not sufficiently exhibited.

However, such conventional cosmetics cannot avoid oiliness, tackiness and oil film feeling, so that cosmetics to which silicone oils such as dimethylpolysiloxane have been blended in order to inhibit oiliness, tackiness and oil film feeling are also known.

The silicone oils have light spread, and superior smoothness and water repellency, but on the other hand, there are disadvantages that they have poor compatibility with hydrocarbon-based liquid oils, and because of low surface tension, they diffuse rapidly and have poor durability.

In case of the compound wherein an alkyl group or a long-chain aliphatic ester group is introduced into the silicone chain, however, it is difficult to smoothly solidify the silicone oil itself, and it is general to allow a liquid oil agent, such as ester oil, triglyceride oil or paraffinic oil, to coexist in order to improve affinity of the silicone oil for waxes and thereby solidify the silicone oil.

In case of the acrylate silicone, the silicone oil forms a solid even if it is used alone, but the solid is resinous and lacks smoothness required for cosmetics.

That is to say, in the existing circumstances, any solid sufficiently exhibiting properties of silicone oils and having satisfactory smoothness has not been obtained yet.

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