Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Adhesive outermost layer
Reexamination Certificate
1998-05-01
2002-04-02
Zirker, Daniel (Department: 1771)
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Adhesive outermost layer
C428S3550EN, C428S3550AC, C428S3550RA, C428S480000
Reexamination Certificate
active
06365271
ABSTRACT:
FIELD OF THE INVENTION
The present invention concerns a material that is useful for coating substrates such as adhesives. More particularly, the invention is directed to an antiblock coating for polymeric hot melt adhesives, and is especially useful for preventing blocking of hot melt adhesives when shipped in the form of particulates.
BACKGROUND OF THE INVENTION
Hot melt adhesives are useful for bonding together various substrates such as wood, paper, plastics, textiles, and other materials. Hot melt adhesives are prepared and shipped in many configurations depending upon the end use for the adhesive. For example, hot melt adhesives can be prepared and shipped in the shape of films, rods, and particulates. Packaging and shipping conditions for hot melt adhesives are important due to stability and shelf life concerns with the polymers, and the potential for blocking or agglomeration of the adhesive materials during shipping or storage. It is especially important to prevent blocking of particulate hot melt adhesives during shipping, because the particles must flow freely in order to be incorporated into a mixing vessel for final hot melt compounding. Hot melt adhesives that are particularly prone to blocking include the water dispersible polyesters described in U.S. Pat. Nos. 5,543,488, 5,552,495, 5,571,876, and 5,605,764.
In light of the above it would be very desirable to produce a hot melt adhesive with a non-tacky coating that maintains the desirable properties of presently available hot melt adhesives.
SUMMARY OF THE INVENTION
The applicants have unexpectedly discovered that dibenzoate esters, and compounds that contain dibenzoate ester moieties (hereinafter “dibenzoate ester compounds”), provide an improved antiblock coating that prevents adhesive materials from blocking to other adhesive materials. Thus, in one aspect the invention provides a coated substrate comprising a coating and a substrate, wherein the coating comprises a dibenzoate ester compound. In another aspect the invention provides a process of coating an adhesive material comprising contacting the adhesive material with a dibenzoate ester compound. In still another aspect the invention provides a process of providing anti-block properties to a particulate adhesive composition comprising contacting adhesive particles with an antiblocking effective amount of a dibenzo ate ester compound. The coated substrate has excellent hot melt adhesive properties. In a preferred embodiment, wherein the dibenzoate ester coats a water-dispersible adhesive material, the antiblock coating is also water-dispersible, thereby providing a coated substrate that is totally recyclable. The composition can be completely repulpable and readily removed from the wood or paper fibers used in disposable products.
Additional advantages of the invention will be set forth in part in the following discussion, and in part will be obvious from the discussion, or may be learned by practice of the invention. The advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the appended claims. It is to be understood that both the foregoing general description and the following detailed discussion are exemplary and explanatory only and are not restrictive of the invention, as claimed.
DISCUSSION
The present invention may be understood more readily by reference to the following detailed description of embodiments of the invention and the Examples included therein. However, before the present compounds, compositions and methods are disclosed and described, it is to be understood that this invention is not limited to specific synthetic methods, or to specific materials or formulations, as such may, of course, vary. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.
Furthermore, it must be noted that, as used in the specification and the appended claims, the singular forms “a,” “an” and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to “an aromatic compound” includes mixtures of aromatic compounds.
Ranges are often expressed herein as from “about” one particular value, and/or to “about” another particular value. When such a range is expressed, another embodiment includes from the one particular value and/or to the other particular value. Similarly, when values are expressed as approximations, by use of the antecedent “about,” the particular value forms another embodiment.
In this specification and in the claims which follow, reference will be made to a number of terms which shall be defined to have the following meanings:
Parts by weight, of a particular element or component in a composition or article, denotes the weight relationship between the element or component and any other elements or components in the composition or article for which a part by weight is expressed. Thus, in a compound containing 2 parts by weight of component X and 5 parts by weight component Y, X and Y are present at a weight ratio of 2:5, and are present in such ratio regardless of whether additional components are contained in the compound.
A residue of a chemical species, as used in the specification and concluding claims, refers to the moiety that is the resulting product of the chemical species in a particular reaction scheme or subsequent formulation or chemical product, regardless of whether the moiety is actually obtained from the chemical species. Thus, an ethylene glycol residue in a polyester refers to one or more —OCH
2
CH
2
O— units in the polyester, regardless of whether ethylene glycol was used to prepare the polyester. Similarly, a sebacic acid residue in a polyester refers to one or more —CO(CH
2
)
8
CO— moieties in the polyester, regardless of whether the residue is obtained by reacting sebacic acid or an ester thereof to obtain the polyester.
“Optional” or “optionally” means that the subsequently described event or circumstance may or may not occur, and that the description includes instances where said event or circumstance occurs and instances where it does not. For example, the phrase “optionally substituted lower alkyl” means that the lower alkyl group may or may not be substituted and that the description includes both unsubstituted lower alkyl and lower alkyl where there is substitution.
By the term “effective amount” of a compound or property as provided herein is meant such amount as is capable of performing the function of the compound or property for which an effective amount is expressed. As will be pointed out below, the exact amount required will vary from process to process, depending on recognized variables such as the compounds employed and the processing conditions observed. Thus, it is not possible to specify an exact “effective amount.” However, an appropriate effective amount may be determined by one of ordinary skill in the art using only routine experimentation.
The term “modified” is often used herein to describe polymers and means that a particular monomeric unit that would typically make up the pure polymer has been replaced by another monomeric unit that shares a common polymerization capacity with the replaced monomeric unit. Thus, for example, it is possible to substitute diol residues for glycol in poly(ethylene glycol), in which case the poly(ethylene glycol) will be “modified” with the diol. If the poly(ethylene glycol) is modified with a mole percentage of the diol, then such a mole percentage is based upon the total number of moles of glycol that would be present in the pure polymer but for the modification. Thus, in a poly(ethylene glycol) that has been modified by 50 mole % with a diol, the diol and glycol residues are present in equimolar amounts.
The term “polyester” includes copolyesters.
The term “dibenzoate ester compound” includes compounds that contain one or more dibenzoate ester moieties.
In one aspect the invention provides a coated substrate comprising a coating and a substrate, whe
Miller Richard Anthony
Thompson Rickey
Boshears, Esq. Betty J.
Eastman Chemical Company
Graves, Jr. Esq. Bernard J.
Zirker Daniel
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