Hercules Corporation

David H Dumas

Paul Harwood Aldrich

Clement L Brungardt

Susan M Ehrhardt

Kyle J Bottorff

John C Gast

Jian-Jian Zhang

Ralph A Bankert

Herbert Thompson Conner

Elliott Echt

Lawrence L Nelson

Donald Kirkbright Black

David R Warren

Fine paper that is sized with a 2-oxetanone alkaline sizing agent and that does not encounter machine feed problems in high speed converting or reprographic machines, including continuous forms bond paper and adding machine paper, processes for converting the paper into envelopes, continuous forms bond paper and adding machine paper, and paper products of the processes.

2-oxetanone sizing agents and their use in paper

Process of using fine paper containing 2-oxetanone sizing agent in high

A filler of inorganic particles, cellulose reactive size and cationic dispersing agent is provided, the use of which results in the capability to obtain the desired sizing level practically unaffected by the level of filler addition.

Pretreatment of filler with cationic ketene dimer

Process of using paper containing alkaline sizing agents with improved

One or more layers of a sheet comprising (1) 60% to 99%, based on the weight of solids, of vermiculite delaminated by mechanical means only, (2) 1% to 40%, based on the weight of solids, of at least one fibrous material and (3) 0.1% to 4%, based on the weight of the vermiculite, of at least one flocculating agent, can be used to protect heat-sensitive substrates such as resin matrix composites from fire or heat.

Flame spread barrier made from mechanically delaminated vermiculite sheet

Disclosed is a process for making a composite sheet using papermaking techniques. The composite sheet comprises (1) 20% to 99%, based on the weight of solids, of vermiculite delaminated by mechanical shearing only, (2) 1% to 80%, based on the weight of solids, of at least one fibrous material and (3) 0.1% to 10%, based on the weight of the vermiculite, of at least one flocculating agent.

Composite sheet made from mechanically delaminated vermiculite

Disclosed is a liquid-impermeable, gas-permeable nonwoven material comprising a thermally consolidated blend of (1) 5% to 30% of a first polyolefin pulp, (2) 15% to 90% of a second polyolefin pulp having a melting point at least 20.degree. C. higher than the first polyolefin pulp, and (3) 5% to 55% of a staple fiber. Also disclosed is a wet forming method for making such a nonwoven material without the use of surfactants.

Gas-permeable, liquid-impermeable nonwoven material

Described are sizing compositions in the form of aqueous dispersions comprising a hydrophobic cellulose-reactive sizing agent such as a ketene dimer, fortified rosin and a water-soluble, nitrogen-containing cationic dispersing agent. The compositions are highly efficient internal or surface sizing agents for paper and maximize the advantages of each sizing component while minimizing the disadvantages.

Aqueous sizing compositions

Disclosed is a method for sizing paper wherein the sizing agent employed is a hydrophobic cellulose reactive sizing agent such as a ketene dimer sizing agent. There is employed in combination with the sizing agent a novel sizing accelerator. Disclosed also is a novel sizing composition comprised of the sizing agent and the accelerator, the accelerator being a water-soluble nitrogen-containing reaction product of (1) a water-soluble polyaminopolyamide, such as that derived by reaction of adipic acid and diethylene-triamine; (2) an epihalohydrin, such as epichlorohydrin; and (3) a composition comprising, by weight, from about 20% to about 65% bis(hexamethylene)triamine, said composition being the residue obtained after recovery of hexamethylenediamine from its manufacture by hydrogenation of adiponitrile.

Sizing method and sizing composition for use therein

Aqueous sizing composition comprising ketene dimer and

Disclosed are novel water-souble, thermosettable resinous compositions derived by reacting a precondensate of dicyandiamide, formaldehyde, a salt of a water-soluble polyaminopolyamide and an ammonium salt with epihalohydrin and then condensing the reaction product with additional formaldehyde. The resinous compositions are cationic and have particular utility in the manufacture of paper sized with cellulose reactive sizing agents such as ketene dimer sizing agents.

Water-soluble thermosettable resinous compositions containing

Disclosed is a sizing composition in the form of an aqueous emulsion comprising a hydrophobic cellulose-reactive sizing agent, such as a ketene dimer, and a cationic polymer selected from the group consisting of (1) a cationic polymer obtained by reacting an epihalohydrin with a condensate derived by condensing dicyandiamide or cyanamide with bis-aminopropylpiperazine and (2) a cationic polymer obtained by condensing an epihalohydrin with bis-aminopropylpiperazine. The cationic polymer is a sizing accelerator for the sizing agent.

Sizing composition comprising a hydrophobic cellulose-reactive sizing

Disclosed is a method for sizing paper wherein the sizing agent employed is a hydrophobic cellulose reactive sizing agent such as a ketene dimer sizing agent. There is employed in combination with the sizing agent a novel sizing accelerator whereby off-the-machine sizing is improved substantially. Disclosed also is a novel sizing composition comprised of the sizing agent and the accelerator, the accelerator being a poly(diallylamine)epihalohydrin resin.

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Wilmington, DE, United States of America

David H Dumas