Goulston | Surface Modification Technologies

Polymer Additives

Polypropylene Melt Additives

Goulston is a leader in modifying the surface of synthetic fibers. Historically, we focused on the application of specifically formulated neat oils or emulsions for the fiber surface. Capitalizing on this expertise, Goulston began developing polymer additives that are injected into the fiber melt to impart highly durable fiber surface modifications and improved melt strength.


HYDREPEL® is a trademarked line of masterbatch hydrophobic additives for polypropylene (PP) resins. These products alter the contact angle and impart extreme hydrophobicity and alcohol repellency (AR) to a PP surface.


Adding HYDREPEL® to polypropylene spunbond, meltblown and spunbond-meltblown-spunbond (SMS) fabrics imparts excellent repellency against water, ethanol and isopropanol for medical barrier and roofing barrier applications. This polymer additive also imparts softness to polypropylene fabric and maintains hydrostatic head (HSH) and tensiles.


It is available in two grades: one for spunbond and the other for meltblown webs. Each grade is compounded with the correct PP carrier resin for excellent extrusion processing and fabric performance.


HYDREPEL® masterbatch additives have years of proven performance on REICOFIL® 2, 3 and 4 lines, and can optimize the cost and performance of your barrier fabric.


IV Enhancer / Chain Extender for Recycled PET

Also known as a chain extender for polyester fibers, Goulston has a line of cost-effective intrinsic viscosity (IV) enhancers for your fiber needs. These additives are useful in a variety of PET recovery and extrusion applications.


Designed to restore the molecular weight of PET, our IV enhancers allow the use of lower cost feedstock for fiber spinning. These additives have proven success in rPET staple and filament applications.


One way of making conjugate bicomponent fiber is using polymers of differing IV. A smart, cost-effective way of accomplishing this IV differential is by utilizing IV enhancer on the polymer on one side of the bicomponent fiber. The different IV makes each side shrink differently, thus providing a permanent curl, typical of conjugate fiber.


Disposal of polymer and spun waste is like throwing money away. Improve cost and reduce environmental impact by reprocessing this valuable feedstock with our IV enhancer to produce chips or pellets with the right IV for downstream processes.

Goulston Technologies, Inc.
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