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US 5,209,823 AGranted
Water-soluble dispersant which aids in the dispersion of polyester fibers during the preparation of a wet-laid nonwoven fiber mat
AssigneeNalco Chemical Company
InventorsRoger H. Jansma, James H. Smith
Life of this patent
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Abstract
A water-soluble dispersant which aids in the dispersion of polyester fibers during the preparation of a wet-laid nonwoven fiber mat, the water-soluble dispersant comprising: polyethylene glycol in an amount greater than about 80% by weight of the water-soluble dispersant: a phthalic acid ester moiety; and a monomeric glycol, wherein the phthalic acid ester moiety and the monomeric glycol are present in an amount less than about 20% by weight of the water-soluble dispersant.
Claims12
A process for forming a wet-laid nonwoven fiber mat comprising:
- adding a water-soluble dispersant to water, said water-soluble dispersant is a terpolymer formed from the distillation product of the monomers consisting of:
- (a) polyethylene glycol in an amount greater than about 80% by weight of said water-soluble dispersant;
- (b) a phthalic ester moiety derived from either a phthalic ester or a phthalic acid;
- and (c) a simple glycol selected from the group consisting of ethylene glycol, propylene glycol, neopentyl glycol and diethylene glycol, wherein said phthalic ester moiety and said simple glycol are present in an amount less than about 20% by weight of said water-soluble dispersant;
- adding fibers to said water subsequent to addition of said water-soluble dispersant, thereby forming a fiber slurry;
- mixing said fiber slurry;
- and
- forming a wet-laid nonwoven web from said mixed fiber slurry.
5 more elements
Dependencies are inferred from the claim text.