Bis(2-propylheptyl) Phthalate

Bis(2-propylheptyl) Phthalate

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IUPAC Name
Bis(2-propylheptyl) benzene- 1,2-dicarboxylate
HS Code
29173990
Formula
C28H46O4
Appearance
Clear, Colorless Liquid
CAS No
53306-54-0
Common Names
Bis(2-propylheptyl) Phthalate, Phthalic Acid, Bis(2-propylheptyl ester)
Packaging
-
Category
  • Plastisizer

Bis(2-propylheptyl) or Di (2-propylheptyl) phthalate is a phthalate and is the diester of phthalic acid and the 10-carbon branched-chain alcohol 2-propylheptanol. DPHP possesses very good plasticizing properties and may be used as a direct replacement for DEHP and DINP in many applications. The unique properties of DPHP makes it difficult to use substitutes, particularly in vinyl products that require high performance, durability and flexibility. DPHP is highly weather resistant, and has a great ability to withstand prolonged sunlight without breaking down, making it ideal for products such as roofing membranes that are used to cover large buildings and arenas. Other beneficial characteristics of DPHP are its durability - giving products a long life span, and its low volatility makes it effective in products that need to be resistant to degradation due to high temperatures, such as electrical wiring & cables and automotive interiors.

Manufacturing Process

In general, DPHP is manufactured commercially in a closed system by catalytically esterifying phthalic anhydride with isometric decyl alcohols (primarily 2-propyl heptanol). As with other phthalates, the unreacted alcohols are recovered and reused, and the DPHP mixture is purified by vacuum distillation or activated charcoal. The purity of DPHP can achieve 99% or greater using current manufacturing processes. Bisphenol A (0.3 – 0.5%) and Topanol CA (0.1%) may be added as stabilizers. The remaining fraction of DPHP may contain a maximum of 0.1% water. Impurities in DPHP may include 1,2- Benzenedicarboxylic acid, bis(4-methyl-2-propylhexyl) ester and 1,2-Benzenedicarboxylic acid, 4-methyl-2-propylhexyl  2-propylheptyl ester. 

Application

  • Wire and Cable Industry

Softened vinyl is a standard material requirement in many of the products manufactured by the wire and cable industry, including wire insulation and calbe. Transmission cable and fiber optics. DPHP allows PVC to meet performance requirements for protecting wires in thousands of different machines and appliances that consumers rely on every day.

  • Automotive 

These days average cars contains numerous plastic parts, many made of flexibilized PVC made with DPHP. This gives manufacturers the versatility they need to meet exact size, shape and texture specifications for products such as door panels, dashboards and arm rest, and other smaller parts. Not only that, the use of PVC made flexible with DPHP in the automobile industry has also made cars safer and more comfortable, and has helped enhance their appearance. In terms of appearance, PVC made flexible with DPHP provides a “soft touch” feel and can be made to look and feel like leather.