Common Name(s): Isobutyl oleate,isobutanol (branched c4) oleic acid (c18:1) ester

DESCRIPTION

What It Does: Softens and conditions skin with a light, non-greasy feel.

Why It's Used: Used for its lightweight liquid branched ester; penetration-enhancing from oleic acid; non-greasy emollient properties; suitable for lightweight skin care where non-greasy texture is key.

How It Works: Ester of isobutanol (branched c4) (branched or specialty alcohol) with oleic acid (c18:1); branching reduces crystallinity and greasiness; provides smooth, dry-oil skin feel.

Typically Found In: Lightweight moisturizers,sunscreens,skin serums,body lotions

TECHNICAL DETAILS

Primary Category: Functional ingredient – emollient

Secondary Functions: Skin conditioning,texture modification,spreading agent

Application Areas:

Typical Concentration Range: 0.5%–10%

SOURCING & ETHICS

Vegan Status: Conditional - feedstock declaration required

Halal Status: Unverified - feedstock declaration required (plant, animal and petrochemical routes all exist)

Source Notes: Isobutanol (branched c4) and oleic acid (c18:1); plant or synthetic origin. [audit 2026-07-29 rev2: origin-dependent: the same inci exists in plant, animal and petrochemical versions and the name does not discriminate. determination requires shariah-panel sign-off.]

SKIN COMPATIBILITY

Irritancy Rating: 1/5 – very low

Comedogenicity Rating: 1/5 – low

Sensitivity Concerns: Generally well tolerated.

Safe for Sensitive Skin: Yes

SAFETY & COMPATIBILITY

Safety Profile: Good safety profile. ewg score: 1.

Works Well With: Other emollients,silicones,natural oils,humectants

Avoid Combining With: No significant incompatibilities

SCIENTIFIC NOTE

Isobutyl oleate: branched c4 + c18:1 oleic acid; liquid emollient with penetration-enhancing effect from oleyl chain; non-greasy, fast-absorbing; used as a carrier for actives.

Last Verified: 2026-03-28

Primary Sources: Cosing database,inci dictionary