Aqueous acrylic polymer emulsions are replacing solvent-based polymer systems thanks to environmental regulations limiting volatile organic compounds (VOCs) and major improvements in the performance characteristics of the emulsion-based products.
Polycaprolactone polyols are considered a special class of aliphatic polyester polyols, used as the soft block segment of high-performance polyurethane elastomers. The polycaprolactone polyols can be produced with very low acid values; perfect end-termination functionality; and narrow molecular weight distributions (MWD). These features manifest themselves in polyurethanes characterized by the following property profile, many of which are best-in-class performance attributes.
Methyl methacrylate (MMA) is a monomer that’s also known as methacrylic acid, methyl ester.
1,4-butanediol (BDO) is a versatile liquid diol intermediate with reactive primary hydroxyl functionality and a linear structure that lends itself to formulating polyurethanes with a good balance of hardness and low temperature flexibility; high strength and durability; and thermal stability.
Polyurea is formed by reaction of diisocyanates and diamines, and it is one of the toughest synthetic polymer materials. These are some of its attributes:
Glacial Acrylic Acid Monomer (GAA) is an unsaturated carboxylic acid co-monomer used as a building block to produced acid functional and crosslinked acrylic copolymers and polyacrylic acids. GAA readily copolymerizes with acrylic and methacrylic esters, ethylene, vinyl acetate, styrene, butadiene, acrylonitrile, maleic esters, vinyl chloride and vinylidene chloride. Copolymers which contain GAA can be solubilized or exhibit improved dispersions in water; the carboxylic acid moiety can be used for coupling or crosslinking reactions, and improved adhesion. GAA copolymers are used in the form of their free acid, ammonium salts or alkali salts. These polymeric uses for GAA account for approximately 45 % of the consumption of acrylic acid monomer (the manufacture of acrylate esters is the other major use).
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Cast polyurethanes are processed in a liquid state. That is, the individual components of the system are liquified before mixing and then cast into a mold or poured onto a surface to allow the cure to advance to a solid state.
Upon completion of the initial cure in the mold, the articles can be transferred for a post-curing stage to complete the reaction and achieve the desired properties.
Gantrade’s P-1000 and P-2000 are oligomeric diamine curatives based on the p-aminobenzoate ester of PTMEG 1000 and PTMEG 2000, respectively. The Gantrade P-1000 is similar to Versaink® P-1000. The P-2000 is a new material, developed for applications where a lower Durometer is required. A diamine based on the p-aminobenzoate of PTMEG 650 is also available from Gantrade Corporation.
When it comes to MDI systems, the chain extender of choice for most processors is 1,4-Butanediol (BDO). Even though BDO possesses good physical properties and an easy liquid form, its higher freezing point, hygroscopic character, and regulative control may leave processors wondering if there are other chain extender alternatives.
What many manufacturers may not realize is that 2-Methyl-1,3-propanediol (MPO) is a viable substitute for BDO.