REDUCED-SHRINK BUBBLE GUM AND METHOD FOR PREPARING SAME

Abstract: A reduced-shrink chewing gum composition having good film-forming characteristics which is prepared with an increased amount of inert inorganic filler and a non-styrene butadiene base. The filler material is included as a compo­ nent of the base and as a component added after formation of the base.

Description: REDUCED-SHRINK BUBBLE GUM AND METHOD FOR PREPARING SAME The present invention relates to the art of chewing gum composition and, in particular, to a novel chewing gum composition having improved softness, good film-forming attributes, and decreased shrink characteristics. Chewing gum compositions, as they are known today, generally comprise a water-soluble flavor portion which is dissipated over a period of time by chewing, and a base portion which is insoluble and inert, and is retained in the oral cavity throughout mastication. Depending on the desired effect of the ultimate chewing gum product, the different portions are composited with components having characteristics necessary to achieve the desired gum product. The base portion, for example, usually comprises primarily an elastomeric component, which can be either natural or synthetic, or a combination thereof, and a resinous component. Elastomers provide the insoluble portion with resiliency for continuous recovery from deformation caused by chewing, and the resin provides the cud with uniform plasticity. These components must be compatibilized in order to produce a single homogeneous cud which has the desired properties throughout. This thoroughly mixed physical state is not always easily achieved because of the relative immiscibility of'certain elastomers and resins. In order to overcome problems of compatibility, certain unique plasticizers may be used to enhance the homogeneity attainable in a gum base. See application Serial No. 377,804, filed May 13, 1982, which is incorporated.herein by reference. Another component which may be included in the gum base is an inert inorganic filler component such as calcium carbonate, talc (3mug0 4six2 H20), magnesium carbonate, etc. which is included in amounts up to about 40% by weight -of the gum base. (Unless otherwise indicated all percentages used herein refers to percent by weight). Since filler material is, in form, a particulate, inclusion of such material in gum base causes discontinuity thereby limiting the amount which can be incorporated into the base without causing separation of the cud upon chewing. For example, U.S. Patent No. 3,984,574 to Comollo discloses a gum base including polyisobutylene in combination with polyvinyl acetate which requires additional components such as hydrogenated or partially hydrogenated vegetable oils or animal fats in an amount of 5-50% of the base, and filler in an amount of 5-40% of the base. Inasmuch as the gum base normally represents no more than about 25%-30% of the total gum composition, the amount of filler present in the overall chewing gum composition would be no more than about 12%, and would normally be about 7.0%. The soluble portion of the chewing gum composition comprises other sweeteners, flavorants, and colorants. Upon chewing the gum composition, these components are solubilized and digested, leaving a cud volume of only about 30% the original size of the initial unit of chewing gum. Consequently, the consumer is left with an unsatisfactory reduced-size piece of gum which, because of the loss of sweeteners, rapidly hardens. Attempts to overcome this disappointing loss of cud volume in chewing gum have not been entirely successful. Increasing the amount of insoluble gum base in proportion to the soluble portion results in a commensurate reduction in the amount of sugar in the gum composition which then requires the use of expensive intense sweeteners to maintain the overall sweetness level. In U.S. Patent No. 4,252,830 to Xehoe, et al. a substantially calorie-free chewable flavored chewing gum base essentially free of water-soluble components is disclosed which includes inert fillers in amounts of at least 50% by weight up to 85% or more and at least 10% by volume of entrapped air voids. The overall gum composition of Rehoe, et al., however, does not include sugar and, consequently, must include an intense sweetener. Furthermore, there is no indication in the Kehoe, et al. patent that the styrene-butadiene base disclosed therein has good film-forming capabilities while maintaining a soft texture. In accordance with the present invention a reduced-shrink chewing gum composition having good filmforming characteristics is provided by including an increased amount of inert inorganic filler material such as calcium carbonate in both the gum base and as a replacement component for the water-soluble materials added to the gum base. The present invention provides a reduced-shrink chewing gum composition having good film-forming characteristics comprising from about 14% to about 35% inert inorganic filler based on the total weight of the gum composition, and a non-styrene butadiene base in an amount of from about 16% to about 30% by weight of the gum composition, the filler included in the gum composition as a component of the gum base and as a component added after formation of the gum base. The present invention also provides a method of preparing a reduced-shrink chewing gum composition having good film-forming characteristics characterized by preparing a filler containing non-styrene butadiene base in an amount sufficient to comprise 16 to 30% by weight of the gum composition and adding thereto additional filler and non-filler components to provide a resulting chewing gum composition containing from 14 to 35% filler by weight of the gum composition. Fillers suitable for use in the present chewing gum composition include, but are not limited to, calcium carbonate, aluminum hydroxide, alumina, magnesium carbonate, dicalcium phosphate, talc (3Mg0 4Si02 H20), magnesium trisilicate, magnesium hydroxide, aluminum silicates, and silica gel. Calcium carbonate is preferred. However, where acid flavors and/or acid sweeteners, such as the free acid form of saccharin, acid cyclamate or Aspartame R are employed in the final chewing gum it is preferred to employ a non-chalk filler, preferably talc. The filler material is included in the gum base in an amount of from about 20% to about 35% by weight based on the total weight of said gum base. The gum base includes non-SBR type masticatory substances of synthetic origin, such as polyisobutylene, polyisoprene, isobutylene-isoprene copolymer, polyvinyl acetate, polyethylene, petroleum wax, as well as masticatory substances of natural origin such as rubber latex solids, chicle, crown gum, nispero, rosidinha, jelutong, pendare, perillo, niger gutta, tunu, etc. This elastomer or masticatory substance is employed in an amount within the range of from about 5% to about 20% by weight of the gum base. The water-insoluble gum base may consist of any of the various bases disclosed for example in U.S. Patent Nos. included in gum 3,052,552 and 2,197,719. Typical ingredients included in gum base compositions are the following: Parts by Weight Base 1 88 Ester gum as Rubber latex solids 10 Lecithin 2 Base II Chicle 30 Jelutong 60 Gutta soh 8.5 Lecithin 2 Base III Partially oxidized chicle 98 Lecithin 2 Base IV Jelutong (dry) 80 Gutta siak 18 Lecithin 2 In addition, the gum base includes plasticizers for the masticatory gum base components such as glyceryl triacetate, acetylated monoglyceride, benzyl benzoate, benzyl butyrate, benzyl phenyl acetate1 butyl-2-decenoate, citronellyl butyrate, cresyl acetate, ethyl acetate, diethyl malonate, diethyl sebacate, triethyl citrate, diethyl succinate, glyceryl tributyrate, ethyl laureate, ethyl acetoacetate, diethyl tartrate, ethyl or butyl lactate, acetyl triethyl citrate, diethyl malate, ethyl oleate, sucrose octaacetate, diacetyl tartaric acid ester of mono and diglycerides, stearyl monoglyceridyl citrate, castor oil, succinylated monoglycerides, lactylic and glyceryl lacto esters of fatty acids, or combinations thereof, with the glyceryl triacetate and acetylated monoglyceride combination being preferred, in an amount of from about 2% to about 15% of the gum base. The gum base can also include waxes which serve as lubricants and should have a melting point of above about 35"C and preferably above about 500C. Examples of such waxes include candelilla wax, carnauba wax, ozokerite, oricury, microcrystalline-wax, refined paraffin wax and the like. The waxes are employed in an amount within the range of from about 0 to about my weight of the gum base, and preferably from about 3 to about 12%. The preferred waxes are microocrystalline wax and paraffin wax employed in combination so that from about 0 to about 18% (based on the weight of the gum base) of the microcrystalline wax is employed with from about 0 to about 188 (based on the weight of the gum base) of the paraffin wax. The waxes are found to reduce the tackiness of the final gum composition without significantly reducing cohesivity thereof. An emulsifier can also be included to impart hydrophilic/hydrophobic balance to the gum base so that saliva will be absorbed thereby making the gum base slippery; the emulsifier will be employed in amounts ranging from about O to about 10% by weight of the gum base, and preferably from about 3 to about 9%. Examples of such emulsifiers include glyceryl monostearate, phosphatides, such as lecithin and cephalin, Tweens, Spans and mixtures thereof. In addition, the gum base can include colorants/ pigments, such as titanium dioxide, and anti-oxidants (when necessary to stabilize non-inventive ingredients) in an amount up to 1000 ppm of the gum base, such as butylated hydroxyanisole, butylated hydroxy toluene, and propyl gallate. The following is a general gum base formulation in accordance with the present invention. Component % by Weight of Gum Base Elastomer - Polyisobutylene, Polyisoprene, Isobutylene Isoprene Copolymer, etc. 5% to 20% Resin - Polyvinyl Acetate 2% to 25% Natural Masticatory Substance 0 to 5% Plasticizer - Triacetin, acetylated monoglyceride, polylimonene, petrolatum, etc. 1% to 50% Filler - CaCO3, Talc1 etc. 20% to 35% Waxes 0 to 18% Texturizing/Emulsifying agents 0 to 10% In any event, the gum bases useful in the present invention can be preformed before forming a chewing gum,-and will be present in an amount within the range of from about 10 to about 40% and preferably from about 15 to about 30% by weight of the chewing gum. The chewing gum of the invention may be of the sugar-containing or sugarless variety. Examples of sweeteners which may be employed include sugars, for example, monosaccharides, of 5 or 6 carbon atoms, such as arabinose, xylose, ribose, glucose, mannose, galactose, fructose, dextrose, or sorbose or mixtures of two or more of the foregoing monosaccharides; disaccharides, for example, sucrose, such as cane or beet sugar, lactose, maltose or cellobiose; polysaccharides, such as partially hydrolyzed starch or dextrin, as well as sugar alcohols, such as sorbitols, mannitol, xylitol, mixtures thereof, as well as hydrogenated starch hydrolysates or isomaltitol, and mixtures of two or more of the above sugars and/or sugar alcohols. Any of the above sugars may be present in an amount of within the range of from about 30% to about 70% and preferably from about 55% to about 65% by weight of the chewing gum. The sugar alcohols, where present, will also be employed in an amount of from about 30% to about 70% and preferably from about 55% to about 65% by weight of the chewing gum. Surprisingly, the amount of sugar employed in the gum composition of the present invention can be reduced by about 15-25% of the amount normally employed without detracting from the level of sweetness of the gum composition. While it is not necessary to use intense sweeteners to maintain adequate sweetness, the chewing gum of the invention may also contain in lieu of or in addition to any of the above sugars or sugar alcohols an artificial sweetener, such as, for example, Aspartame R , cyclamate, or a saccharin or other sweetener as set out hereinafter, the artificial sweetener being present in an amount of from about 0 to about 1.5% by weight, and preferably, from about 0.05 to about 0.38 by weight of the chewing gum. Examples of artificial and natural sweeteners which may be employed herein include sodium, calcium or ammonium saccharin salts, dihydrochalcones, glycyrrhizin, dipotassium glycyrrhizin, glycyrrhizic acid ammonium salt, L-aspartyl-Lphenylalanine methyl ester (aspartame),' the sodium, ammonium or calcium salt of 3, 4-dihydro-6-methyl-l ,2,3, -oxathiazine- 4-one-2,2-dioxide, the potassium salt of 3,4-dihydro-6 methyl-i, 2, 3-oxathiazine-4-one-2, 2-dioxide (Acesulfame-K), as well as Thaumatococcus daniellii (Thaumatin I and II), Stevia rebaudiana (stevioside), 'Richardella dulcifica (Miracle Berry), Dioscoreophyllum cumminsii (Serendipity Berry), cyclamate salts, and the like or mixtures of any two or more of the above. The chewing gum of the invention may include flavoring, such as sour or fruit flavoring or non-acid or mint flavoring in an amount ranging from about 0.5 to about 2% by weight of the final chewing gum product. The flavoring may comprise synthetic flavors and oils derived from plants, leaves, flowers, fruit, etc. -Representative fruit flavor adjuncts include acids, such as adipic, citric, succinic and fumaric acid, and citrus oils, such as lemon oil, orange oil, lime oil, grapefruit oil, and fruit essences, such as, apple essence, pear essence, peach essence, strawberry essence, apricot essence, raspberry essence, cherry essence, plum essence, pineapple essence, as well as the following essential oils: peppermint oil, spearmint oil, mixtures of peppermint oil and spearmint oil, clove oil, bay oil, anise oil, eucalyptus oil, thyme oil, cedar leaf oil, cinnamon oil, oil of nutmeg, oil of sage, oil of bitter almonds, cassia oil, and methylsalicylate (oil of wintergreen). Various synthetic flavors, such as mixed fruit, may also be incorporated in the chewable gum base with or without conventional preservatives. Finally, an additional amount of inert inorganic filler is also included in the normally water-soluble components added to the preformed gum base. The amount of additional filler material added with the' water-soluble components can be from about io% to about 30% by weight based on the weight of the chewing gum composition, thereby raising the overall amount of filler to from about 14% to about 35% by weight of said gum composition, and preferably from about 16% to about 25%. The following is a general chewing gum composition formula in accordance with the present invention. % by Weight of Chewing Gum Component Composition Gum Base in Accordance With the Invention ^ 16% to 30% Sugar Pulverized 35% to 55% Corn Syrup 0 to 15% Filler 10% to 30% Flavor 0.2 to 3% Emulsifiers 0 to 4% Color 0 to 2% Intense Sweeteners 0 to 1.5% Sugar Alcohol(s) 0 to 15% Traditionally, cud volume, or insoluble base materials remaining after extraction of soluble ingredients, has been considered as one measure of chewing gum acceptability. In the case of bubble gums, cud volume is critical since it determines the size of bubbles and, to some extent, the ease with which they may be blown. Cud volume can be determined by the difference in weight of a gum cud in air and in a liquid of known density. Typically, a piece of bubble gum weighing 8.14 grams and having a volume of 6.54 cm yields a cud volume of about 2.26 cm3 after chewing for ten mintues, which is a 65.4% volume loss. A sample of bubble gum weighing 8.23 grams produced in accordance with the present invention, and having an initial volume 6.26 cm3, yields a cud volume of 3.99 cm3 after ten minutes of chewing -- a volume loss of only 36.3%. See Table I. TABLE I Bubble gum Typical of the Bubble Gum Invention Piece Weight 8.14 gm 8.23 gm Cud Weight 2.37 gm 4.18 gm (After 10 minutes. of Chewing) Piece Volume 6.54 cm3 6.26 cm3 Cud Volume 2.26 cm3 3.99 cm3 (After 10 minutes of Chewing) Volume Loss 65.4% 36.3% Liquid used to measure change in volume was n-butylphthalate which has a density of 1.048 gm/cm The present chewing gum composition not only possesses superior film-forming properties but also a significant reduced-shrink feature by which the size of the insoluble cud remaining after mastication is sustained at from about 60% to about 70% by volume of the original size of a unit of chewing gum produced with the composition. This is compared to the normal cud volume of from about 30% to about 378 of original gum unit size remaining after masticating the water-soluble components out of chewing gum, an increase of about 50%. Furthermore, the sweetness perception of the present chewing gum composition is maintained at the same level as chewing gum containing approximately 10-20% more water soluble or non-intense sweetener. Another desirable attribute of the present invention is that the resulting chewing gum is initially very soft, and remains very soft after sustained chewing which is unexpected in view of the fact that increased filler levels in polymeric compositions have in the past been associated with increased hardness. In a preferred embodiment, the chewing gum of the present invention is ideal for a coextruded gum product. Specifically, the soft gum herein can be coextruded as a core portion, thus rendering the overall product softer and capable of retaining high cud volume. For a better understanding of the present invention, together with other and further objects, reference is made to the following descriptions of specific examples and its scope will be pointed out in the appended claims. EXAMPLES OF THE INVENTION The chewing gum of the present invention was prepared in accordance with the following formulae. GUM BASE % by Weight Component of Gum Base Polyisobutylene Elastomer 12.5% Resins: Polyvinyl Acetate (M.W. 20,000-40,000), et al. 32.5% Plasticizers - e.g., Polylimonine, Glyceryl, Triacetate, and Acetylated Monoglyceride 15.25% Calcium Carbonate (CaCO3) Filler 29.5% Waxes 10,508 CHEWING GUM COMPOSITION 8 by Weight of Chewing Gum Component Composition Gum Base 22.50% (as described immediately above) Sugar Pulverized 51.0% High Fructose Corn Syrups 90 DE 4.0% Sorbitol Syrup 8.0t Calcium Carbonate (CaCO3) Filler 13.5% Flavor 0.8% Color 0.1% In order to prepare the base the ingredients were mixed in a sigma-blade mixer a temperature of about 1200C by introducing the polyisobutylene elastomer along with a portion of an appropriate plasticizer, followed by a first portion of the polyvinyl acetate and the filler. More plasticizer was then added with the remaining polyvinyl acetate, filler, as well as the wax. The gum base prepared as described above was then melted in a mixer at 1600F and a small portion of the pulverized sugar', high fructose syrup, and filler were added with mixing over a period of 4-6 minutes. Thereafter, the remaining ingredients were added according to conventional chewing gum making practice to form a reduced-shrink, soft bubble gum having an excellent film-forming property as well as good sweetness perception. In order to demonstrate the unexpected results relative to producing a soft high-filler content chewing gum by use of the present invention, tests were conducted on samples of the gum produced in accordance with the previous Example. One type of test which can be made to determine softness is a test measuring the degree of hardness, i.e., resistance of a material to local deformation. Hardness tests usually result in measurements indicating the depth of penetration of an indentor or probe under a specific set of conditions. Hardness was measured on a Thwing-Albert Electronic Tensile Tester Model Q.C. It, specially modified to measure compression of chewing gum. The chewing gum sample was placed between two metal plates measuring 1" X 1·". The gum, originally h" in thickness was compressed to one-half of its original thickness or %" at a speed of 20 in/min. These tests were conducted at room temperature (24,50C) using a 100 lb capacity load cell. The measurement obtained was the peak force (in lbs) required to compress a chewing gum sample aged three-months to one half of its original thickness. TABLE I Compression Test Peak force (Ibs) required to compress sample to F original thickness * Reduced-shrink Sample Control Bubble gum A 35.4 29.2 B 33.8 26.2 C - 40.3 27.5 D v 39.0 29.7 E 35.2 25.7 Avg. 36.74 27.66 * 24% Base which includes 30% filler 58% Sugar 17% Corn Syrups 0.8% Flavor 0.1% Color As evident from the data, the samples exhibited readings which were 24.7% softer than the control product. Perception testing was also conducted in order to determine how the chewing gum of the invention compared to a similar non-SBR low filler chewing gum. The formula of the comparative gum composition was as follows: COMPARISON GUM BASE Component % by Weight Polyisdbutylene Elastomer 12.5% Resins 32.5% Plasticizers/Waxes/etc. 25.75% Filler 29.25% COMPARISON CHEWING GUM COMPOSITION Gum Base 24% Sugar Pulverized 58% Corn Syrups 17% Flavor 0.8% Color 0.1% ,The results of these tests, which were conducted on a sample population of 186 persons, are shown below in Table II. TABLE II Chewing Gum of Comparison the'Invention(%) Chewing Gum(%) Initial Softness 54 46 Larger Bubble-Blowing Characteristics 53 47 Easier Bubble-Blowing 55 45 Long Lasting Softness 56 .44 Long Lasting Flavor 53 47 Better Initial Chew 52 48 Size Retention 58 42 These results clearly show that comparable quality chewing gum is achieved by use of the present invention wherein inexpensive filler can be used to replace a portion of the sugar content. The same chewing gum composition as outlined above may be prepared utilizing other non-SBR type bases, such as polyisoprene, isobutylene-isoprene copolymer, alone or in combination with each other or with elastomers of natural origin as previously described herein.

Claims: Claims 1. A reduced-shrink chewing gum composition having good film-forming characteristics comprising from about 14% to about 35% inert inorganic filler based on the total weight of the gum composition, and a non-styrene butadiene base in an amount of from about 16% to about 308 by weight of the gum composition, the-filler included in the gum composition as a component of the gum base and as a component added after formation of the gum base. 2. The chewing gum composition of Claim 1 wherein the filler is present in an amount of from about 16% to about 258 of said gum composition. 3. The chewing gum composition of Claim 1 or 2 wherein the filler is selected from calcium carbonate, aluminum hydroxide, alumina, magnesium carbonate, dicalcium phosphate, talc (3MgO 4ski0, H20), magnesium trisilicate, magnesium hydroxide, aluminum silicate or silica gel. 4. The chewing gum composition of Claim 3 wherein the filler is calcium carbonate. 5. The chewing gum composition of any of Claims 1 to 4 wherein the base is selected from polyisobutylene base, polyisoprene base or isobutylene-isoprene copolymer base. 6. The chewing gum composition of Claim 5 wherein the base is polyisobutylene base. 7. The chewing gum compositidn of any of Claims 1 to 6 wherein the base further comprises other masticatory substances of natural origin, selected from rubber latex solids, chicle, crown gum, nispero, rosidinha, jelutong, perdare, perillo, niger gutta or tunu. 8. The chewing gum composition of any of Claims 1 to 7 wherein the components added after formation of the gum base further comprise a sweetener selected from sugar, hydrogenated starch hydrolysates, sugar alcohols or corn syrup, in an amount of from about 35% to about 70% by weight based on the weight of said gum composition. 9. The chewing gum composition of any of Claims 1 to 7 which further comprises intense sweeteners of artificial or natural origin. 10. The chewing gum composition of any of Claims 1 to 9 wherein the filler is included in the base in'an amount from about 20% to about 358 by weight based on the weight of the base. 11. The chewing gum composition of any of Claims 1 to 10 wherein the filler being included in the gum composition as a component added after formation of the base comprises about 10% to about 30% by weight based on the weight of said gum composition. 12. The chewing gum composition of any of Claims 1 to 11 wherein the resultant composition fs in the form of a coextruded gum product. 13. The chewing gum composition of any of Claims 1 to 11 wherein the composition is the core portion of a coextruded gum. 14. A method of preparing a reduced-shrink chewing gum composition having good film-forming characteristics characterized by preparing a filler containing non-styrene butadiene base in an amount sufficient to comprise 16 to 30% by weight'of the gum composition and adding thereto;:," additional filler and non-filler components to 'provide a resulting chewing gum composition containing from 14 to 35% filler by weight of the gum composition. 15. A method according to Claim 14 wherein the base contains from 20-to 35% filler by weight of the base. 16. A method according to Claim 14 or 15 wherein the additional filler being added after preparing the gum base comprises 10 to 30% by weight of the gum composition. 17. The method of any of Claims 14 to 16 wherein the resulting chewing gum requires a force of no more than about 30 'lbs to compress a sample aged three months to one-half its original; size. Claims for Austria 1. A method of preparing a reduced-shrink chewing gum composition having good film-forming characteristics characterized by preparing a filler containing non-styrene butadiene base in an amount sufficient to comprise 16 to 30% by weight of the gum composition and adding thereto additional filler and non-filler components to provide a resulting chewing gum composition containing from 14 to 35% filler by weight of the gum composition. 2. A method according to Claim 1 wherein the base contains from 20 to 35% filler by weight of the base. 3. A method according to Claim 1 or 2 wherein the additional filler being added after preparing the gum base comprises 10 to 30% by weight of the gum composition. 4 The method of any of Claims 1 to 3 wherein the resulting chewing gum requires a force of no ore than about 30 ibs to compress a sample aged three months to one-half its original size.

Inventors: CLARK, WARREN, KEHOE, GARY, PUGLIA, WAYNE J.
Applicants: NABISCO BRANDS, INC.
Application year: 1983
Main classification: A23G3
IPC codes: A23G4