Method for preventing the discoloration of paper and paper treat

Details Method for preventing the discoloration of paper and paper treat Method for preventing the discoloration of paper and paper treat

1991-06-12

1993-01-26

Alvo, Steve

Paper making and fiber liberation

Processes and products

With coating after drying

162 80, 162158, 1621812, 10628729, 427395, D21H 2132, D21H 2304

Patent

active

051819880

ABSTRACT:
A process for treating paper to prevent discoloration when exposed to light which comprises adding 1% to 10% by weight of hypophosphorous acid or its salt based on the paper at any stage during or after paper making and maintaining said hypophosphorous acid or its salt therein. The invention also provides paper which contains hypophosphorous acid or its salt to prevent discoloration when exposed to light.

REFERENCES:
patent: 2208574 (1940-07-01), Fleck
patent: 2226841 (1940-12-01), Barnhart
patent: 3536578 (1970-10-01), Brundige et al.
patent: 3619355 (1971-11-01), Silberman
patent: 4820307 (1989-04-01), Welch et al.

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