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Low Profile Additives

Notes

*4/20/2012

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Notes

“Thermoplastic materials are often added to the molding compositions in order to reduce shrinkage of the part during cure, or in some cases a small amount of expansion, thereby providing molded parts which more accurately reflect the molds in which they were made, and which have relatively smooth surfaces. These thermoplastics are referred to in the art as "low profile additives".

A number of thermoplastics have been found to give varying levels of shrinkage control. Examples are poly(vinyl acetates); polymethylmethacrylates and copolymers with other acrylates; copolymers of vinyl chloride and vinyl acetate; styrene-butadiene copolymers and other elastomers; polystyrene and certain copolymers of certain monomers; polycaprolactones; cellulose acetate butyrate; saturated polyesters and various blends of saturated polyesters with poly(vinyl chloride); and polyurethanes.

In molding compositions containing polyurethane low profile additives, the polyurethane is typically prepared by first reacting an organic polyisocyanate with a polyester or polyether polyol to form a hydroxyl-terminated prepolymer and then reacting this with a dicarboxylic acid anhydride to form an esterified polyurethane.”

[Rex and Atkins,  US Patent 5,589,538 (12/31/1996)]

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Roger D. Corneliussen
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Copyright 2012 by Roger D. Corneliussen.
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* Date of latest addition; date of first entry is 4/20/2012.

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