Temporary wet strength paper
AssigneeThe Procter & Gamble Company
InventorsMichael Martyn Headlam, David Jay Smith
Life of this patent
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Abstract
The present invention relates to paper products having temporary wet strength. The paper products contain cellulosic fibers that are treated with a polyaldehyde polymer having free aldehyde groups and a water soluble polyhydroxy polymer. The initial wet strength obtained with the combined use of these materials is significantly greater than that obtained by use of either the polyaldehyde or pelyhydroxy polymer alone. At the same time, the wet strength decays at a rate that is rapid enough to enable the paper product to be flushed under conditions of normal use.
Claims15
A paper product having a 30 minute total wet tensile strength of not more than about 40 g/inch, the paper product comprising:
- (a) cellulosic fibers;
- and
- (b) a binder, said binder comprising (i) a polyaldehyde polymer having free aldehyde groups and (ii) a water-soluble polysaccharide having hydroxyl groups comprising cis-hydroxyl groups, said aldehyde groups of said polyaldehyde being reacted with said cellulosic fibers and with said hydroxyl groups of said polysaccharide to form chemical bonds joining said fibers.
A method of making a paper product having a 30 minute total wet tensile strength of not more than about 40 g/inch, the method comprising the steps of:
- (a) providing a slurry comprising water, papermaking fibers, a polyaldehyde comprising free aldehyde groups, and a water soluble polysaccharide having hydroxyl groups comprising cis-hydroxyl groups;
- said slurry having a pH of 7 or less;
- (b) depositing said slurry onto a foraminous substrate;
- (c) draining the water from said fibers;
- (d) drying the paper made from said fibers;
- and
- (e) reacting said aldehyde groups of said polyaldehyde with said cellulosic fibers and with said hydroxyl groups of said polysaccharide to form chemical bonds joining said fibers when said fibers are dry.
Dependencies are inferred from the claim text.