National Starch and Chemical Corporation

Robert H Williams

James L Eden

Ralph M Trksak

Carmine P Iovine

Craig H Leake

Frank J Washabaugh

Paul R Demko

Virtually any material may be encapsulated in a starch matrix by combining the material with a high temperature-stabilized dispersion of starch, optionally in the presence of salt. The temperature-stabilized starch dispersion acts as a protective colloid, encasing the material to be encapsulated. Upon subsequent rapid cooling of this mixture on a chilled surface the starch polymer chains collapse upon themselves, forming a firm sheet or the like and encapsulating the core material. The sheet can then be cut, chopped or sliced in the wet state, then dried and ground to yield particles.

Starch based encapsulation process

A starch-based alkaline curing adhesive is disclosed. The adhesive, when employed in the preparation of corrugated paperboard provides the paperboard with superior water resistant bonds. The adhesive contains from about 6 to 35%, based on total weight of the adhesive, solids basis, of a latex polymer of a halohydrin quaternary ammonium monomer.

Water-resistant alkaline adhesive composition

A wide range of materials may be encapsulated in a starch matrix by combining the material with a high temperature-stabilized pressurized dispersion of starch in the presence of salt. The temperature-stabilized starch dispersion acts as a protective colloid; upon subsequent rapid reduction of the pressure, the mixture cools and the starch polymer chains collapse upon themselves, encapsulating the core material in particulate form.

Starch based particulate encapsulation process

Improved adhesive compositions useful in the manufacturing of corrugated boards are disclosed; said compositions being comprised of a mixture of: (a) a crosslinkable water dispersible polymer, (b) an ungelatinized starch, (c) a urea-formaldehyde resin, (d) an acidic metal salt, and (e) water.

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Piscataway, NJ, United States of America

Robert H Williams