Specialty Starch Products

100% Cotton yarns sizing 100% Cotton yarns sizing 100% Cotton yarns sizing 

3399-Unmodified-Industrial grade-Reg. corn starch 3290-Unmodified-With chem. add. 

5860-Acetylated(60FL)-Industrial grade-Waxy corn starch 

CORN PRODUCTS Specialty Starch Products(Continued) Product by Trade  

Cotton and mixed yarns sizing Printing Finishing 

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A specialty starch is defined as one where some form of chemical modification takes place to give properties to the starch that are lacking in the native product. The remainder of this paper will discuss the chemistry of modification and the chemical and physical reasons for the use of specialty starches in treating paper. 

The physical nature of the products produced by these processes is the principal reason for the growing use of specialty starches. 

The dominant specialty starch used in size press applications is the hydroxyalkyl derivative commonly made wjth ethylene oxide to yield a hydroxyethyl starch. Low substituted hydroxypropy1 starch has similar properties. These starches were introduced to the industry in 1950 and they have grown in importance each year. Recent expansions in production by major producers has indicated their continuing dominance of the specialty starch surface sizing and coating field. 

As a native starch, lipids and protein residuals are significantly lower than they are in many other commercial starches. These properties of tapioca starch have been utilized in many industries and further enhanced by means of physical and/or chemical modifications which give close control of its properties to fit the needs of customers in process and product applications. However, tapioca starch is regarded as a specialty starch outside of its local production area. 

It is conceivable that methodology such as that used to increase starch quantity could be used to influence starch quality by manipulation of starch synthase and branching isoforms. These new starches may have greater usefulness in food and industrial processes. The production of modified "specialty starches via molecular biology techniques is promising, and perhaps more beneficial and more economical than the chemical modification of starch for industrial purposes. 

Attempts have been made to use cold-set adhesives in the cormgating operation, such as poly(vinyl acetate) and modified, precooked starch formulations, but these have not achieved any appreciable degree of commercial acceptance (20). The use of a polyethylene film appHed to the inside surface of the linerboard facing, which serves as a hot-melt cormgator adhesive, has achieved some commercial usage. However, its use is limited to the small, specialty product niche of fast-food hamburger cartons (see Olefin polymers, polyethylene). 

HSB Industrial Risk Insurers ICI/National Starch Chemical Co. International Specialty Products, Inc. Kellogg Brown Root, Inc. 

The major starch sources are corn, potato, waxy maize, wheat and tapioca. Refined starches are supplied in powder form or as slightly aggregated pearl starch.16 Unmodified (native) starch is rarely used in the paper industry, except as a binder for laminates and in the corrugating process. Most starches for use in papermaking are specialty products that have been modified by controlled hydrolysis, oxidation or derivatization.17... 

Pregelatinized starch is sometimes used as a coating binder,258 but these products are difficult to wet out uniformly and may cause problems due to clumping. Small granules of starch are used in specialty coatings.259... 

The carrier portion of the corrugator adhesive provides the viscosity needed to hold the raw starch in suspension and to retain water during application. Heating and stirring of the carrier and of the final product need to be carefully controlled in order to maintain the correct viscosity. In the majority of corrugator formulations, starch solids range from 18% to 21%, but may increase to 30% for specialty applications. About 15-17% of the total starch is used as carrier. 

Wacker, in which Hoechst had been a partner from the start, also managed to retain its independence, although it was still active in some commodity-type products (acetic acid, vinyl monomers and polymers, and silicon carbide), it chose to emphasize lines that showed greater profitability, such as silicones, hyper pure silicon for semiconductors, and specialty and fine chemicals. In France the well-run starch and derivatives producer Roquette Freres, after a short flirtation with Rhone-Poulenc, was able to recover its autonomy. 

Specialty Products. Enzymes, because of their high substrate specificity and stereospecificity, are ideal for producing special compounds required by the food and pharmaceutical industries (36). By all measures, the conversion of corn starch, produced by wet milling, to glucose and fructose has been the most successful commercial operation (37). More than ten billion pounds of fructose are produced and used by the food industry each year. 

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