Micro-bits of expanded flexible polyurethanes

Details Micro-bits of expanded flexible polyurethanes Micro-bits of expanded flexible polyurethanes

C - Chemistry, Metallurgy

08

J

241/136, 403/15,

C08J 9/38 (2006.01) B29B 17/04 (2006.01) C02F 1/28 (2006.01) C08J 3/12 (2006.01) D21H 17/57 (2006.01)

Patent

CA 1106100

ABSTRACT This invention is directed to novel polyurethane structures, termed polyurethane mico-bits and the process for their preparation which comprises comminuting a flexible polyurethane foam in an inert fluid, e.g., water. Attempts made in the past to use particulate polymers in paper to obtain improved properties have met with failure because of the lack of a mechanism for connecting them to the paper's fibers. Polyurethane micro-bits are characterized by broken and interconnected stands from adjacent portions of the polyurethane cellular structure. These strand portions are tripodal shaped particles having hook-like projections, indentations and flutes formed by the destruction of the foam's thin walled portions. It is believed that these structures provide attachment points for the paper's fiberous component. Polyurethane micro-bits when incorporated in a paper improve its tear and tensile strength properties and are useful as absorbents to remove such contaminants as phenols from aqueous and gaseous streams.

311085

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