Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K3/00—Materials not provided for elsewhere
  • C09K3/16—Anti-static materials
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/40—High-molecular-weight compounds
  • C08G18/48—Polyethers
  • C08G18/4833—Polyethers containing oxyethylene units
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
  • C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
  • C08L27/06—Homopolymers or copolymers of vinyl chloride
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
  • C08L75/04—Polyurethanes
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S524/00—Synthetic resins or natural rubbers -- part of the class 520 series
  • Y10S524/91—Antistatic compositions
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S525/00—Synthetic resins or natural rubbers -- part of the class 520 series
  • Y10S525/932—Blend of matched optical properties

Definitions

• This invention relates to new electrostatic dissipating additives based on low molecular weight polyether oligomers which have been reacted with a chain extender to form a high molecular weight polymeric material. These chain extended polymers when used in concert with other polymeric materials do not significantly impair the physical properties of the new polymeric composition.
• the present invention also relates to plastic articles which are formed from the new polymeric composition containing the chain extended polymer additives.
• Plastic materials have a significant tendency to accumulate static electrical charges due to low electrical conductivity.
• static electrical charges on sheets of thermoplastic film can cause the sheets to adhere to one another thus making their separation for further processing more difficult.
• the presence of static electrical charges causes dust to adhere to items packaged in a plastic bag, for example, which may negate any sales appeal.
• the increasing complexity and sensitivity of microelectronic devices makes the control of static discharge of particular concern to the electronic industry. Even a low voltage discharge can cause severe damage to sensitive devices.
• the need to control static charge buildup and dissipation often requires the total assembly environment to be constructed of partially conductive materials. It also may require electrostatic protective packages, tote boxes, casings, and covers be made from conductive polymeric materials to store, ship, protect, or support electrical devices and equipment.
• ESD electrostatic dissipative
• antistatic agents are also either cationic or anionic. These tend to cause the degradation of plastics, particularly PVC, and result in discoloration or loss of physical properties.
• Other antistatic agents have significantly lower molecular weights than the base polymers themselves. Often these lower molecular weight antistatic agents possess undesirable lubricating properties and are difficult to incorporate into the polymer. Incorporation of the lower molecular weight antistatic agents into the polymers often will reduce the moldability of the base plastic because the antistatic agents can move to the surface of the plastic during processing and frequently deposit a coating on the surface of the molds, possibly destroying the surface finish on the articles of manufacture. In severe cases, the surface of the article of manufacture becomes quite oily and marbleized. Additionally, the lower molecular weight ESD agents often tend to lose their ESD capability due to evaporation, develop undesirable odors, and can promote stress cracking or crazing on the surface of an article in contact with the article of manufacture.
• One of the known lower molecular weight antistatic agents is a homopolymer or copolymer oligomer of ethylene oxide.
• use of the lower molecular weight polymers of ethylene oxide or polyethers as antistatic agents are limited by the above-mentioned problems relative to lubricity, surface problems, or less effective ESD properties. Further, these low molecular weight polymers can be easily extracted or abraded from the base polymer thereby relinquishing any electrostatic dissipative properties.
• the present invention relates to a chain extended polymer having electrostatic dissipative properties.
• the chain extended polymer is formed from low molecular weight polyethers which are reacted with a chain extender to furnish a useful additive. Many of these low molecular weight commercially available polyether materials without being chain extended would not be useful as anti ⁇ static agents because of their negative effects on the base polymers.
• low molecular weight polyether materials often have functional groups which are capable of acting as sites for chain extension.
• the polyether will have two (2) functional groups. It has been found that when the low molecular weight polyethers are reacted with a chain extender that the resulting polymers will be of high molecular weight.
• the chain extended polymers of this invention can be modified by varying the molecular weight of the polyether oligomer or the nature of the chain extender so that the physical, electrical, or optical properties can be tailored for specific applications. For example, the index of refraction of an ESD polymer can then be matched to that of a base polymer thereby providing a clear composition. Further, the properties of the chain extended polymer of this invention can be altered by the addition of a modifier.
• the present invention also relates to electrostatic dissipative polymeric compositions comprising an effective amount of the chain extended polymer mixed with a base polymer.
• the chain extended polymer is effective as a static dissipative in the range of from about 3 parts to about 100 parts by weight per 100 parts by weight of the base polymer in the polymeric composition.
• the present invention further relates to a process for preparing the electrostatic dissipative polymeric compositions by adding to a base polymer an effective amount of the chain extended polymer.
• the present invention relates to a chain extended polymer having electrostatic dissipative properties
• a chain extended polymer having electrostatic dissipative properties comprising (A) a low molecular weight polyether oligomer having two reactive moieties and an average molecular weight from about 200 to about 10,000 wherein the oligomer is a homopolymer or a copolymer of two or more copolymerizable cyclic ether monomers having the formula:
• R,, R 2 , R 3 , R 4 , and R 5 are independently hydrogen, unsubstituted or substituted alkyl, cycloalkyl, cycloalkenyl, aryl, aralkyl or alkaryl, the substituents are ORg, S> , NR .., CN or halogens, and R 7 are independently hydrogen, alkyl, cycloalkyl, cycloalkenyl, aryl, aralkyl, alkaryl, or carboxyl, the reactive moieties are OH, NH 2 , or NHRg, n is 0, 1, 2, or 4; (B) from about 0 moles to about 35 moles of a modifier for each mole of low molecular weight polyether and (C) a chain extender; with the proviso that the number of moles of chain extender per mole of the sum of the number of moles of low molecular weight polyether oligomer plus the number of moles of modifier is from about
• the number of moles of chain extender per mole of the sum of the number of moles of low molecular weight polyether oligomer plus the number of moles of modifier is from about 0.97 to about 1.03.
• low molecular weight oligomer it is meant that the polyether will have an average molecular weight from about 200 to about 10,000 and preferably from about 500 to about 5000, as determined by end group analysis.
• the reaction of the low molecular weight oligomer with a chain extender will furnish a chain extended polymer having melt indices from 0.05 to 110 grams per ten minutes.
• the preferred mel index range of the chain extended polymer will be from about 1.0 to 65 grams/10 minutes.
• the melt index is determined according to ASTM D-1238 Procedure A at a barrel temperature of 190°C and an 8700 gram piston load.
• the low molecular weight oligomer employed is a polymer of cyclic ether monomers wherein R,, R 2 and R 3 are hydrogen and R 4 is H, CH 3 , or CH 2 X wherein X is a halogen, OR e , NR ⁇ ;R- or COO ⁇ , and « and R 7 are as defined hereinabove.
• the most preferred cyclic ether is ethylene oxide.
• the low molecular weight polyether oligomer is end capped with ethylene oxide or ethylene imine thereby providing an oligomer which will have two primary moieties.
• the alkyl groups can have from 1 to 6 carbon atoms, be straight or branched chain and may be unsubstituted or substituted.
• the alkenyl groups can have from 1 to 6 carbon atoms, be straight or branched chain, have 1 or two double bonds and be unsubstituted or substituted.
• the cycloalkyl and cycloalkenyl groups can have from 3 to 8 ring carbon atoms and from 1 to 3 rings.
• the cycloalkenyl groups can have 1 or 2 double bonds.
• the aryl groups can have from 6 to 10 ring carbon atoms and one or two rings.
• Useful polyether oligomers are linear polymers having the general formula:
• X + 1 is the number of repeating ether units, each M is a reactive moiety, n is 0,1,2, or 4 and Rj, R 2 , R 3 , R 4 and R s are as defined hereinabove.
• M is the OH group.
• X + 1 is at least 4 and between 4 and about 250.
• the useful range of polyether oligomers have an average molecular weight from about 200 to 10,000 and preferably from about 500 to 5000.
• Commercially available polyethylene glycols useful in this invention are typically designated as polyethylene glycol 600, polyethylene glycol 1450, and polyethylene glycol 4000.
• the polyether oligomer can be a homopolymer or a copolymer of two or more copolymerizable monomers.
• monomers are ethylene oxide, propylene oxide, 1,2-butylene oxide, epichlorohydrin, allyl glycidyl ether, n-butyl glycidyl ether, glycidyl acrylate, glycidyl methacrylate, 2-ethylhexyl glycidyl ether, tetrahydrofuran, or styrene oxide.
• the present invention also relates to electrostatic dissipative polymeric compositions comprising an effective amount of the chain extended polymer and a base polymer or base polymer blend.
• the chain extended polymer is effective as a static dissipative in the range of from about 3 parts to about 100 parts by weight wherein the total of the base polymer or polymer blend is 100 weight parts.
• the composition can have from about 5 parts to about 35 parts of the chain extended polymer per 100 parts by weight of the base polymer or base polymer blend.
• the desired percent of oligomer in the chain extended polymer will depend upon the molecular weight of the oligomer, the chain extender, the modifier, if implemented, and the base polymer employed. The percentages may be different for various base polymers and can be determined by experimentation.
• the clarity of the composition will further depend upon amount of the ESD additive in the composition.
• the difference between the refractive index of the chain extended polymer and the base polymer blend is 0.02 or less.
• the present invention also relates to a clear polyvinyl chloride composition
• a clear polyvinyl chloride composition comprising polyvinyl chloride and an effective amount of an electrostatic dissipative additive said composition having the following electrical properties:
• the spectrophotometer was calibrated with haze standards having nominal values of 5 and 10, Part No. HG-1214, as supplied by Gardner Laboratory Division, Bethesda, MD.
• the surface resistivity will be less than about 1 x 10 13 Ohms/sq, and the volume resistivity will be less than about 1 x 10 Ohms-cm. In the most preferred embodiment the surface resistivity of composition will be less than about 1 x 10 12 Ohms/sq, and the volume resistivity less than about 1 x 10 12 Ohms-cm.
• the preferred light transmission is greater than 70% for a 20 mil film as measured according to ASTM D-1003-61; and the preferred haze value is less than 30% for a 20 mil film.
• the most preferred light transmission is greater than 80% for a 20 mil film as measured according to ASTM D-1003-61; and the most preferred haze value is less than 20% for a 20 mil film.
• Static decay is a measure of the ability of a material, when grounded, to dissipate a known charge that has been induced on the surface of the material.
• a sheet sample (3" x 6") with 1/8-1/16 inch thickness is placed between clamp electrodes contained in a Faraday cage.
• a 5,000 volt positive charge is applied to the surface of the specimen and the time in seconds required to dissipate the charge to 500 volts (10% of its initial value) or to 50 volts (1% of its initial value) , after a ground is provided, is then measured. This test was run on unconditioned samples and on samples conditioned for 48 hours at 15% relativity humidity (RH) .
• RH relativity humidity
• the base polymer as defined herein can be a homopolymer or a copolymer for example, polyvinyl chloride, chlorinated polyvinyl chloride, copolymers of styrene and acrylonitrile, terpolymers of styrene, acrylonitrile, and diene rubber, copolymers of styrene and acrylonitrile modified with an acrylate elastomer, copolymers of styrene and acrylonitrile modified with ethylene propylene diene monomer rubber, polystyrene and rubber modified impact polystyrene, nylon, polycarbonate, thermoplastic polyesters including polybutylene terephthalate, polyethylene terephthalate and polyether-ester block copolymers, polyurethane, polyphenylene oxide, polyacetal, polymethyl methacrylate.
• the base polymer can be further blended with one or more other polymeric materials, e.g., another base polymer
• Polyvinyl chloride, PVC, vinyl polymer, or vinyl polymer material, as used herein, refers to homopolymers and copolymers of vinyl halides and vinylidene halides and includes post halogenated vinyl halides such as CPVC.
• Examples of these vinyl halides and vinylidene halides are vinyl chloride, vinyl bromide, vinylidene chloride and the like.
• olefinic monomers there may be mentioned the ⁇ ,/3-olefinically unsaturated carboxylic acids, such as acrylic acid, methacrylic acid, ethacrylic acid, ⁇ - cyanoacrylic acid, and the like; esters of acrylic acid, such as methyl acrylate, ethyl acrylate, butyl acrylate, octyl acrylate, cyanoethyl acrylate, hydroxyethyl acrylate, and the like; esters of methacrylic acid, such as methyl methacrylate, butyl methacrylate, hydroxyethyl metha ⁇ rylate, and the like; nitriles, such as acrylonitrile, methacrylonitrile, and the like; acrylamides, such as methyl acrylamide, N-methylol acrylamide, N-butyoxy methylacrylamide, and the like; vinyl ethers, such as ethyl vinyl ether, chloroeth
• the present invention is particularly applicable to homopolymers and copolymers made by the polymerization of vinyl chloride or vinylidene chloride alone or in admixture with one or more polymerizable olefinic monomers copolymerizable therewith in amounts up to about 20% by weight, based on the weight of the monomer mixtures.
• Some copolymers have a tendency to decrease the clarity of the article and therefor the comonomer amount in the copolymer should be minimized.
• the most preferred vinyl polymer, or resin is polyvinyl chloride (PVC) homopolymer produced by the mass or suspension polymerization process and the invention, for simplicity and convenience, will be described in connection therewith, it being understood that this merely intended in an .
• PVC polyvinyl chloride
• Articles of this invention may be made from resins produced by the suspension, mass, emulsion or solution processes.
• the low molecular weight polyether oligomer intermediate and the non-hindered diisocyanate are co-reacted simultaneously in a one-shot polymerization process at a temperature above about 100°C and usually about 120°C, whereupon the reaction is exothermic and the reaction temperature is increased to about 200°C to 285°C.
• the polyether oligomer can be blended with a glycol or a diamine modifier before reaction with a diisocyanate.
• the glycol modifier may be any diol (i.e., glycol) or combination of diols, containing 2 to 10 carbon atoms, such as ethylene glycol, 1,3-propanediol, propylene glycol, 1,4-butanediol, 1,3-butanediol, 1,5- pentanediol, 1,6-hexanediol, diethylene glycol, 1,4-cyclohexane dimethanol, neopentyl glycol, hydroquinone bis(2-hydroxyethyl) ether, or any aliphatic or aromatic molecule containing two reactive hydroxyl groups.
• the preferred glycol modifier is 1,4-butanediol.
• diamine modifiers can be any diamine or combination of diamines, containing
• 0 or 2 to 10 carbon atoms such as hydrazine, ethylene diamine, 1,3-diamino-propane, a inoaniline and the like.
• the amount of chain extender employed will be about 1.0 moles. If a glycol or diamine modifier is employed, the sum of the moles of the modifier plus the moles of polyether oligomer will be at a ratio of about 1.0 mole for each 1.0 mole of chain extender.
• the hydroxyl or amino terminated polyols described above can be blended with a glycol or diamine modifier before the blend is reacted with a polyisocyanate or the polyol and the modifier can be brought to the reaction zone simultaneously. If desired, the polyol can be reacted with the diisocyanate, then the prepolymer is reacted with the modifier. Stabilizers such as antioxidants can be added prior to the reaction or during the reaction.
• the amount of glycol or diamine modifier is generally from about 0 to about 35 moles and desirably from about 0 to about 20 moles for every mole of low molecular weight polyether oligomer.
• the number of moles of diisocyanate per total of the number of moles of the low molecular weight polyether oligomer plus the number of moles of modifier is from about 0.95 to about 1.06 and preferably from about 0.97 to about 1.03.
• two or more of the polyether oligomers can be reacted with a chain extender to furnish an oligomer dimer or tri er. These dimers or trimers can then be chain extended under similar conditions to form the high molecular weight polymer. This procedure can be used to produce a high molecular weight chain extended polymer with varying chain extender groups.
• chain extenders are molecules having two functional groups (reactive sites) which will react with the reactive moieties of the polyethers.
• the reactive moieties typically occur at the ends of the polyether oligomers as a result of routine synthesis, however the reactive moieties can be located at locations other than the ends. Generally, these are hydroxyl groups, although this group may be substituted by any of several other reactive groups which can then react with another function group on the chain extender.
• the reactive moieties most useful for the present invention are OH, NH 2 and NHR «. In a preferred form the reactive moieties are OH, NH 2 or NHR « and are on primary carbon atoms. The most preferred reactive moiety is OH.
• chain extenders are organic diacids, acid derivatives, such as diesters, diacyl halides, and the like, diisocyanates or any other difunctional molecule or oligomer which can react with the polyether oligomer moieties.
• useful diacid derivatives are diethyl or dimethyl esters of carbonic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, sebacic acid, phthalic acid, and the like.
• Acyl halides which are effective in this invention are acyl chlorides of carbonic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, sebacic acid, phthalic acid and the like.
• diisocyanates are the chain extenders utilized. Suitable diisocyanates include, for example, 1,4-diisocyanatobenzene (PPDI) , 4, ⁇ -methylenebis(phenyl isocyanate) (MDI) , 4,4'-methylenebis(3-methoxy phenyl isocyanate), 1,5-naphthalene diisocyanate (NDI) , toluene diisocyanate (TDI) , m-xylene diisocyanate (XDI) , 1,4-cyclohexyl diisocyanate (CHDI) , 1,10- diisocyanatonaphthylene, and 4,4•-methylenebis- (cyclohexyl isocyanate) (H 12 MDI) . The most preferred diisocyanate is MDI.
• PPDI 1,4-diisocyanatobenzene
• MDI 4, ⁇ -methylenebis(phenyl is
• the subject invention contemplates the process for preparing an electrostatic dissipative polymeric composition comprising the steps of adding to a base polymer an effective amount of the chain extended polymer and mixing the polymers to produce the electrostatic dissipative composition.
• compositions of the present invention are useful for a variety of applications. Some examples are tubes, paper trays, floor tiles, machine housings, tote bins, and polymeric films.
• compositions of the present invention can be utilized in various conventional additives.
• heat stabilizers, lubricants, heat distortion additives, impact modifiers, fire retardants, antioxidants, UV inhibitors, and processing aids generally employed for use in polymers can be implemented.
• plasticizers such as those typically used and known to one skilled in the art can also be uti ⁇ lized.
• fillers and pigments can also be employed in conventional amounts. The amounts and types of additives, fillers and/or pigments required are well known to those skilled in the art.
• Example Nos. 1 to 5 describe the preparation of several chain extended polymers.
• Example 6 illustrates the methods for blending the chain extended polymer with a base polymer.
• Example Nos. 7 to 10 describe various compositions that were prepared and the results of tests, i.e., measurement of the electrical and optical properties, that were carried out to evaluate the materials.
• Example 1 Polyethylene glycol (Dow E-600) , 0.2 moles (121 grams) having a molecular weight of 603 as determined by end group analysis was reacted with 0.201 moles (50.25 grams) of 4,4•-methylene ⁇ bis(phenyl isocyanate) (MDI) by a standard high temperature random melt polymerization procedure.
• MDI 4,4•-methylene ⁇ bis(phenyl isocyanate)
• the polymerization procedure involved heating the polyether and MDI separately to about 100°C and then mixing the ingredients. The reaction is exothermic and raises the temperature to about 200 to 285°C in about 1 to 5 minutes, during which time polymerization takes place as evidenced by an increase in viscosity.
• the sample was molded into a plaque and the physical properties were measured. The sample had a volume resistivity of 4.9 x 10 10 Ohms-cm and a surface resistivity of 8.7 x 10 12 Ohms/sq.
• Polyethylene glycol (Dow E-1450) 0.2 moles (290 grams) having a molecular weight of 1450 as determined by end group analysis was blended at 60°C with 0.844 moles (76.064 grams) of 1,4-butane diol. This blend or physical mixture was then reacted with 1.044 moles (26.27 grams) of 4,4'-methylene-bis(phenyl isocyanate) (MDI) by a standard high temperature random melt polymerization procedure as described in Example 1.
• MDI 4,4'-methylene-bis(phenyl isocyanate)
• the sample was molded into a plaque and the physical properties were measured.
• the sample had a volume resistivity of 5.4 x 10'° Ohms-cm, a surface resistivity of 6.0 x 10 u Ohms/sq and a refractive index of 1.551.
• Polyethylene glycol (Dow E-1450) 0.2 moles (278 grams) having a molecular weight of 1390 as determined by end group analysis was blended at 60°C with 0.496 moles (44.6 grams) of 1,4-butane diol. This blend or physical mixture was then reacted with 0.696 moles (174 grams) of 4,4'-methylene-bis (phenyl isocyanate) (MDI) by a standard high temperature random melt polymerization procedure as described in Example 1.
• MDI 4,4'-methylene-bis (phenyl isocyanate)
• MDI 4,4'-methylene-bis(phenyl isocyanate)
• Example 7 The chain extended polymer of Example 2 (polyurethane 45) was compression molded into plaques. The static decay and volume resistivity was then measured. Also, several blends, i.e. different loadings of polyurethane 45 in PVC were prepared and compression molded the static decay rates were measured after being conditioned for 48 hours at 15% relative humidity (RH) and unconditioned. These results are summarized in Table I. The volume resistivity of the plaques was also measured. These results are summarized in Table II.
• Example 8 The chain extended polymer of Example 2 (polyurethane 45) was blended with several resins, CPVC, ABS, polystyrene, and a vinyl chloride/acrylate copolymer using the procedure described in Example 6A. The blends contain 30 parts by weight of polyurethane 45 per 100 parts of the base polymer except for the polystyrene sample which contained 100 parts by weight of polyurethane 45 per 100 parts of the base polymer. These blends were compression molded and the static decay was measured. The results are summarized in Table III below.
• Example 9 Several chain extended polymers were prepare polyurethane 45, polyurethane 56, polyurethane 64 and polyurethane 72 each having 45, 56, 64 and 72 percent ethylene oxide oligomer, respectively. Compositions were prepared using polyvinyl chloride and each of the polyurethanes. These blends contained 30 parts by weight o the respective polyurethane per 100 parts by weight of PVC. These blends were compression molded and the static decay was measured. The results are summarized in Table IV below.
• Example 10 Polyvinyl chloride (PVC) and several test plaques containing blends of 100 parts PVC and 30 parts ESD (antistatic) additives were prepared.
• the ESD additives compared were polyurethane 45, polyurethane 56, and a commercial ethylene oxide-epichlorohydrin (EO-ECH) copolymer.
• EO-ECH ethylene oxide-epichlorohydrin
• a test plaque of a blend of 100 parts of vinyl chloride/acrylate copolymer and 30 parts polyurethane 45 was prepared. These plaques were compared for light transmission and percent haze. The results obtained show that haze can be reduced and light transmission increased when the refractive index of the_two materials has been properly matched. Further, the results show that the commercially available antistatic materials are not suitable for clear applications.
• the results for percent light transmission were as measured according to ASTM D-1003 and for percent haze as measured using a Hunterlab model D-54P-5 spectrophotometer or equivalent. The

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