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US 4,787,937 AGranted
High solids corrugating adhesive
AssigneeNational Starch and Chemical Corporation
InventorCraig H. Leake
Life of this patent
Estimating the term…
Abstract
Alkaline-curing, starch-based corrugating adhesives employing ungelatinized tapioca starch and a carrier comprising high amylose starch, wherein the total solids of the adhesive is from 30 to 45% solids by weight, are disclosed. Said adhesives provide improved tack and corrugator running speeds.
Claims12
An alkaline curing starch-based corrugating adhesive comprising
- a. from about 23 to 42% of an ungelatinized tapioca starch,
- b. from about 1 to 9% of a gelatinized starch comprising at least 40% by weight of amylose,
- c. from about 0.2 to 1.3% of alkali,
- d. from about 0.2 to 1.3% of borax, and
- e. from about 55 to 70% water, wherein the percentages of the components are based on the total weight of the adhesive.
2 more elements
In an alkaline curing starch-based corrugating adhesive of the type employing a raw ungelatinized starch and a gelatinized starch carrier, the improvement comprising:
- employing 23 to 42% ungelatinized tapioca starch in combination with 1 to 9% of a gelatinized starch comprising at least 40% of amylose, taken in amounts such that the total solids of the adhesive is from 30 to 45% solids by weight.
In a process for preparing a corrugated paperboard comprising the steps of
- a. applying to the tips of the corrugations of a fluted paper strip a corrugating adhesive comprising ungelatinized raw starch and a gelatinized starch carrier, alkali, borax and water, and
- b. applying a facing to the adhesive coated tips of said fluted paper strip to form an adhesive bond;
- the improvement wherein said corrugated adhesive composition contains from about 23 to 42% of ungelatinized tapioca starch in combination with 1 to 9% of a gelatinized starch comprising at least 40% by weight of amylose, taken in amounts such that the total solids of the adhesive is from 30 to 45% solids by weight.
Dependencies are inferred from the claim text.