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US 5,574,088 AGranted
Increasing the resistance of fiber material to oxidizing agents
AssigneeTichromatic Carpet Inc.
InventorYassin Elgarhy
Life of this patent
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AssigneeTichromatic Carpet Inc.
InventorYassin Elgarhy
Estimating the term…
A composition for increasing the resistance of polyamide fibers or polyester fibers to oxidizing agents comprising an organosiloxane modified with amino groups, melamine formaldehyde resin, a catalyst for complexing the melamine formaldehyde resin and water. The composition is used by applying it to the fibers so the fibers absorb the composition, and then drying and curing the composition on the fibers. The composition is employed to treat a polyester or polyamide felt employed to convey wood pulp which is to be bleached, prior to paper making operations, treatment of the felt with the composition significantly lengthens the useful life of the felt, exposed to bleaching chemicals.
In a process of chemically oxidizing cellulosic wood pulp prior to manufacture of paper from the wood pulp in which wood pulp is supported on a porous, self-supporting carrier sheet of polyamide or polyester fibers and the wood pulp and the carrier sheet are exposed to a chemical oxidizing agent for bleaching the wood pulp to increase the whiteness or brightness of paper subsequently produced from the bleached wood pulp and in which the polyamide or polyester fibers of the carrier sheet are deleteriously affected by the oxidizing agent, the improvement wherein said carrier sheet is pretreated with a composition which increases the resistance of the polyamide or polyester fibers of the carrier sheet to the oxidizing agent, said composition comprising
In a process of chemically bleaching cellulosic wood pulp prior to manufacture of paper from the wood pulp in which the wood pulp is supported on a porous, self-supporting polyamide fiber carrier sheet, and the wood pulp and the carrier sheet are exposed to a chemical bleaching agent for bleaching the wood pulp to increase the whiteness or brightness of paper subsequently produced from the bleached wood pulp, said carrier sheet having a length of at least 40 meters and a thickness of at least 2 mm, and in which the polyamide fibers of the carrier sheet are deleteriously affected by the chemical bleaching agent, the improvement wherein the carrier sheet is pretreated with a composition which increases the resistance of the polyamide fibers of the carrier sheet to the chemical bleaching agent thereby extending the working life of the carrier sheet, said composition consisting essentially of:
Dependencies are inferred from the claim text.