Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
1998-03-18
2001-02-13
Dawson, Robert (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C260SDIG031, C260SDIG031, C260SDIG031, C260SDIG031, C260SDIG031, C260SDIG031, C264S211000, C427S393100, C523S404000, C523S414000, C524S539000, C525S408000, C525S423000, C525S430000
Reexamination Certificate
active
06187856
ABSTRACT:
FIELD OF THE INVENTION
The present invention generally relates to an anti-static composition for polymeric materials. More particularly, by cross-linking a polyaminoamide with a polychlorohydrin derivative, an anti-static composition is formed which, when applied onto a polymeric substrate permanently imparts anti-static properties onto the substrate.
BACKGROUND OF THE INVENTION
The production of static electricity on polymeric materials caused by the accumulation of electrical charge thereon creates problems. Both natural and synthetic polymeric fibers have a tendency to accumulate electrical charge, resulting in the production of static electricity. Numerous methods have been proposed to prevent such electrification. Examples include the application of a surfactant having antistatic properties onto the surfaces of polymeric substrates. The antistatic effects of such surfactants, however, has proven to be only temporary due to their lack of durability, anti-stat properties can be lost during the dyeing process, or during cleaning or by mechanical damage. It has also been proposed that an antistatic agent be incorporated directly into a polymeric substrate during its formation, while at the same time attempting to maintain the fiber's spinnability and quality of construction.
It is common knowledge that fibers prepared from conventional natural and synthetic polymeric materials tend to collect and retain, for periods of time, static electrical charges when coming into contact with each other or foreign objects. The electrostatic charge build-up can occur quite rapidly and often dissipation of the charge into the environmental atmosphere is extremely slow. A consequence of this is that the polymeric material may remain electrostatically charged for hours at a time. This property tends to make filaments difficult to handle during manufacturing operations and results in objectionable fiber properties, particularly in wearing apparel and carpeting. Electrostatically charged polymeric textile materials may not only attract each other, but may also attract such things as dust, dirt, and lint. In general, however, electrostatically charged polymeric substrates, regardless of their form such as, for example, carpeting, plastic packing materials, etc, benefit from dissipation of static charge with respect to their ease of use, appearance and safety.
The accumulation of static charges and the slow dissipation thereof on polyamide fibers prevents finished, polymeric fabrics from draping and wearing in a desirable manner, and causes the same to cling uncomfortably to the body of the person wearing them. Fibers having a high electrostatic susceptibility often cling to guides and rolls in textile machinery during the manufacturing and processing thereof and are sometimes seriously damaged and weakened. As a result, the quality of the end product is lower than it might otherwise be. For these reasons, and because end-uses such as garments, upolstery, hosiery, rugs, blankets and fabrics are greatly benefited by a reduced tendency to accumulate and maintain electrostatic charges, a permanent antistatic composition to be applied thereon is highly desirable.
Presently, in the commercial production of natural and synthetic polymeric fibers, the as-spun filaments are given some treatment to improve their electrostatic and handling properties. This treatment usually consists of passing the filaments, while in the form of a bundle, through a bath or over a wheel coated with a treating of finishing liquid. The finish thus applied is a coating and is not of a permanent nature. Most, if not all, of the antistatic agent on the fiber surface is lost in subsequent processing of the filament by mechanical handling, heating, washing, scouring and dyeing. If the antistatic agent does remain on the fiber until the final end product is produced, it often becomes less effective after the end product is used for a period of time, and especially after a number of washings or dry cleaning operations.
Efforts have been made in the past to produce permanent antistatic polymeric fibers and articles by the application of a more permanent coating. However, due to the harsh finishing applications the coated fibers were subsequently exposed to, the coatings would either be removed and/or fail to perform adequately. It has also been attempted to incorporate antistatic type comonomers directly into the base polymeric materials. For various reasons, however, such as a resulting harsh fiber surface or sacrifice of good fiber physical properties, these methods have been proven unsuccessful.
Antistatic compositions are also used for enhancing the receptivity of plastic surfaces to electrostatically applied coatings, e.g., in automobile production. In this application it is also desirable that the antistatic composition resist removal when exposed to an aqueous rinse or wash liquid.
Accordingly, it is a primary object of the present invention to provide novel compounds capable of dissipating electrical charges.
Another object of the invention is to provide a process for imparting permanent antistatic properties onto natural and synthetic polymeric substrates.
SUMMARY OF THE INVENTION
The present invention is directed to a new and novel antistatic composition capable of being permanently affixed to a polymeric material, the antistatic composition containing a crosslinked thermosetting resin formed by reacting, in the presence of a water-soluble solvent, (a) a polyaminoamide having unreacted primary and secondary amine groups, and (b) a polychlorohydrin derivative.
There is also provided a process for making an antistatic composition involving the steps of (a) forming a polyaminoamide having unreacted primary and secondary amine groups, and (b) reacting, in the presence of a water-soluble solvent, said polyaminoamide with a polychlorohydrin derivative.
The present invention also provides a process for permanently affixing an antistatic composition onto a natural and synthetic polymeric substrate comprising contacting said substrate with an antistatic composition containing a crosslinked thermosetting resin formed by reacting, in the presence of a water-soluble solvent, (a) a polyaminoamide having unreacted primary and secondary amine groups, and (b) a polychlorohydrin derivative.
The composition and process of the present invention are also useful for dissipating an electrostatic charge on a static prone natural or synthetic polymeric substrate, thereby imparting a desired level of surface conductivity onto formed plastic articles, such as automobile bumper parts, for electrostatically applied coating materials, resulting in good adhesion of the coating material onto the treated article.
DESCRIPTION OF THE INVENTION
Other than in the operating examples, or where otherwise indicated, all numbers expressing quantities of ingredients or reaction conditions used herein are to be understood as being modified in all instances by the term “about”.
The composition of the present invention is formed by crosslinking a polyaminoamide with a polychlorohydrin derivative.
The polyaminoamide of the present invention is preferably formed by reacting a polyamine with a polyacid. The amine groups of the polyamine are primary and/or secondary amine functional groups and can be present as part of the polymer backbone, polymer endgroups or pendent branches to the main polymer chain. Suitable polyamines include, for example, diethylenetriamine, triethylenetetramine and tetraethylenepentamine. Particularly preferred polyamines are diethylenetriamine and triethylenetetramine.
Suitable polyacids include, for example, malonic acid, succinic acid, glutaric acid, adipic acid and sebacic acid. A particularly preferred polyacid is adipic acid.
Thus, by reacting a polyamine with a polyacid, a suitable polyaminoamide may be formed. Optionally, reactants such as C
36
dimer and C
54
trimer acids, methyl esters of fatty alcohol ethoxylates (oxa-acids), amine terminated EO homopolymers or EO-PO block copolymers (JEFFAMINES®) can be added in amounts of up to
Fischer Stephen A.
Incorvia Michael J.
Dawson Robert
Drach John E.
Henkel Corporation
Millson, Jr. Henry E.
Robertson Jeffrey B.
LandOfFree
Anti-static composition and process for making same does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Anti-static composition and process for making same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Anti-static composition and process for making same will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2586805