Sanduvor PR 31
[CAS# 147783-69-5]

Identification

• Classification: Food additive >> Antioxidants
• Name: Sanduvor PR 31
• Synonyms: 1,1-Bis(1,2,2,6,6-pentamethyl-4-piperidyloxycarbonyl)-2-(4-methoxyphenyl)ethene; Bis(1,2,2,6,6-pentamethylpiperidin-4-yl) p-methoxybenzylidenemalonate; Hostavin PR 31; PBH 3; PR 31
• Molecular Formula: C₃₁H₄₈N₂O₅
• Molecular Weight: 528.72
• CAS Registry Number: 147783-69-5
• EC Number: 414-840-4
• SMILES: CC1(CC(CC(N1C)(C)C)OC(=O)C(=CC2=CC=C(C=C2)OC)C(=O)OC3CC(N(C(C3)(C)C)C)(C)C)C

Properties

• Solubility: Practically insoluble (0.095 g/L) (25 °C), Calc.^*
• Density: 1.10±0.1 g/cm³ (20 °C 760 Torr), Calc.^*

^* Calculated using Advanced Chemistry Development (ACD/Labs) Software V11.02 (©1994-2015 ACD/Labs)

Safety Data

• Hazard Symbols: GHS09 Warning
• Risk Statements: H400-H410
• Safety Statements: P273-P391-P501

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Chronic hazardous to the aquatic environment	Aquatic Chronic	1	H410
Acute hazardous to the aquatic environment	Aquatic Acute	1	H400
Eye irritation	Eye Irrit.	2	H319

Discovery and Applications

Sanduvor PR 31 is a highly effective light stabilizer designed to protect polymers and coatings from the degrading effects of ultraviolet (UV) radiation. This chemical belongs to the class of hindered amine light stabilizers (HALS), which are renowned for their ability to extend the life span of materials exposed to sunlight and other sources of UV light. The development of Sanduvor PR 31 was part of efforts in the late 20th century to create advanced stabilizers that could perform in diverse environmental conditions.

The synthesis of Sanduvor PR 31 involves the incorporation of sterically hindered amines into a polymer-compatible structure. This unique composition enables it to act as a radical scavenger, neutralizing free radicals generated by UV-induced degradation. Unlike UV absorbers, which dissipate UV energy, HALS like Sanduvor PR 31 focus on interrupting the degradation cycle, making them especially effective for long-term stabilization.

Sanduvor PR 31 finds widespread application in the plastics and coatings industries. It is particularly valuable in protecting polymers such as polypropylene, polyethylene, and polyvinyl chloride (PVC), which are prone to photodegradation. By preventing discoloration, cracking, and loss of mechanical properties, this stabilizer significantly enhances the durability of plastic products used in outdoor applications, including automotive components, construction materials, and agricultural films.

In coatings, Sanduvor PR 31 is used to maintain color and gloss in paints and varnishes exposed to sunlight. Its compatibility with a wide range of formulations allows for its use in industrial and architectural coatings, ensuring long-lasting protection for surfaces exposed to harsh environmental conditions.

The discovery and deployment of Sanduvor PR 31 illustrate the pivotal role of HALS in material preservation. By addressing the challenges posed by UV radiation, it contributes to sustainability by reducing the frequency of material replacement and improving the performance of products in demanding applications.

References

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