【Applications for 2-methyl-1,3-propanediol (mpo)
Physical Properties:
Boiling Point (760 torr) 212℃
Freezing Point -54℃
Specific Gravity (20℃/20℃) 1.015
Flash Point 127℃
Ignition Temperature 380℃
Unsatured Polyester Resins (Composites).
 The unique molecular structure of MPO brings significant process and property advantages to unsatured polyester resins. The all-primary hydroxyl and high boiling point character of MPO increase both esterification rates and kettle productivity. This higher reactivity compared with other glycols, such as propylene glycol, leads to lighter color resins. Also, the non-linear backbone of MPO provides polyester with excellent styrene miscilility. MPO provides an excellent balance of tensile strength, elongation and flexibility to the final product. Molding resins can achieve higher elongations and “toughness” without sacrificing modulus. Moreover, unlike other flexibilizing glycols, MPO will not lead to losses in chemical resistance, water resistance or weatherability. Isocyanate modified unsaturated polyester resin molding system benefit from incorporating MPO into the polyester. The two primary hydroxys of MPO ensure reliable, rapid isocyanate chain extension in these hybrid resin system.
Unsatured Polyester Resins (Gel Coats).
 With their exacting performance requirements, gel coats gain key benefits from the inherent properties of MPO. Gel coats formulated with MPO-based polyesters have high strength and elongation characteristics, excellent blister resistance and excellent weatherability. Comprehensive testing has demonstrated that MPO enhances the toughness of gel coats without sacrificing extended weatherability performance. MPO-based polyester used in these applications are suitable for use in marine and fiberglass panel resins.
Saturated Polyester for Coating.
 MPO unique capability to flexibilize high aromatic content-phthalic, isophthalic, or terephthalic-based polyesters enables O-T flexibility coupled with H-2H pencil hardness. This coupling of hardness and flexibility is only possible because the MPO-based polyesters have a very low tendence to form crystalline, insoluble polyesters- even when high aromatic content is utilized. Extensive testing of MPO base polyesters also has demonstrated that MPO can be utilized to make highly weatherable polyester binders that can compete effectively with top-of-the-line exterior durable polyesters.
MPO is a building block that can be broadly utilized in the diverse field of polyurethane coating, adhesives, sealants and elastomers. Application systems include: 2K industrial maintenance coatings, aqueous polyurethane dispersions, liquid prepolymers for urethane elastomers and urethane adhesives. As a liquid diol, MPO can be used as a chain extender to build molecular weight and performance in urethane elastomers, adhesives and sealants. The branched structure of MPO leads itself especially well to the manufacturing of clear, pliable sealants and adhesives. In addition, MPO has excellent compatibility with conventional polyols and dependable reactivity with the isocyanate component. MPO is an ideal intermediate for polyester polyols because it yields all primary hydroxyl-containing polyesters. Its unique structure makes it possible to produce liquid polyesters that are readily dissolved in conventional coatings solvents. MPO based polyester polyols also demonstrate excellent compatibility in urethane adhesive formulations.
 The unique noncrystallizing nature of MPO-based diesters and polyesters can be a significant handling advantage for the thermoplastics (PVC) compounder. The very low glass transition temperatures of MPO-based ester and polyester derivatives ensure efficient utilization of these premium polyesters. End uses for MPO-based plasticizers include: PVC Laminating Films Refrigerator Gaskets Vinyl Electrical Insulation (wire, cable, tape, etc.)
MPO Alkoxylate.
MPO reacts with ethylene oxide or propylene oxide to from MPO alkoxylate. The main applications are the manufacture of UV curing agent monomer, polyester polyol, painting, ink, adhesive and polyurethane.
MPO Diacrylate/ Dimethacrylate and MPO Alkoxylate Diacrylate/ Dimethacrylate.
MPO or MPO alkoxylate reacts with acrylic acid/ methacrylic acid to from MPO diacrylate/ dimethacrylate or alkoxylate diacrylate/ dimethacrylate. Both glycol diacrylate can be used in quite broad applications as starting materials and intermediates for thermosetting paints, adhesives, nonwoven fabric binders, photosensitive agents, paper finishing agents, copolymer modifiers and cross-linking agents. But MPO alkoxylate diacrylate/ dimethacrylate has lower skin irritation and odor than MPO diacrylate/ dimethacrylate.
MPO Polycarbonate.
 MPO reacts with DMC or DEC to form MPO polycarbonate. Recause MPO is a branched aliphatic diol with two primary hydroxyls that inhibits the crystallization of MPO polycarbonate allowing it to remain liquid even in cold temperature. The main applications are the adhesives softsegment intermediates for polyurethanes, coating and ink.
Modified Polyethylene Terephthalate (PET)
 MPO provides an effective crystallization modifier for PET. The branched structure of MPO helps control both thermal and crystallization properties of the final polyester products. This control offers differential performance features in polyester bottle and fiber resin applications. PET is essentially a highly crystalline resin and, therefor, appear opaque. It is known to use a small quantity of isophthalic acid together with terephthalic acid as the dicarboxylic acid component of PET or to use MPO together with ethylene glycol as the glycol component of PET can obtain transparent bottle. But isophthalic acid is very expensive, MPO modified PET can reduce PET bottle cost. MPO has a side chain of a methyl group which renders the polyester an asymmetric chemical structure, if this compound is used as PET Fiber, the result PET fiber will be made in irregular form, and dyestuff molecules will attach to it readily. Therefore, the resulting PET fiber are endowed with excellent dyeability, lesser elongation and greater strength.
Personal Care.
 MPO also can be used in an amollient, emulsifier and humectant. The hydrophilic/ lipophilic balance of MPO provides solvency to both polar and non-polar active components. This feature ensures shelf-stable formulations and clear, homogenous solution.
Storage and Handling
 MPO is a stable material. It should be stored away from strong mineral acids. If low water content is important, it should not suffer excessive exposure to atmospheric moisture and should be stored under a nitrogen blanket. It can be both shipped and stored in phenolic-lined, mild steel containers. Stainless steel will also help extend product consistency.