Absorbent articles comprising surface cross-linked...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Compositions to be polymerized by wave energy wherein said...

Reexamination Certificate

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C522S086000, C522S087000, C522S088000, C522S089000, C522S090000, C522S096000, C522S010000, C522S103000, C522S104000, C522S107000, C522S113000, C522S114000, C522S116000, C522S120000, C522S121000, C522S123000, C522S134000, C522S135000, C522S137000, C522S141000, C522S154000, C522S173000, C522S175000, C522S178000, C522S181000, C427S508000, C427S512000, C428S402000, C428S403000

Reexamination Certificate

active

07569618

ABSTRACT:
A method of surface cross-linking superabsorbent polymer particles using UV irradiation is provided. The method is carried out in a so-called drum reactor, which comprises a hollow drum and an irradiation source. The drum has a longitudinal axis and a cross-section. Radical former molecules are applied on the surface of superabsorbent polymer particles. These superabsorbent polymer particles are fed into the drum and are irradiated while they move within the drum, which is rotated around its longitudinal axis. The irradiation source is provided such that the radiation emitted by the irradiation source is able to reach superabsorbent polymer particles within said drum. The irradiation source for use in the method is able to emit UV radiation of a wavelength between about 201 nm and about 400 nm.

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