JPS62256421A - Capacitor having dielectric made of polymer of polyacrylate polyether prepolymer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to dielectrics for electrical capacitors, and more particularly to polyacrylate polyether prepolymers and polymers thereof for capacitor dielectrics.

This invention relates to the following co-pending commonly assigned U.S. patent applications and patents:

U.S. Patent Application No. 562.779 entitled "Miniaturized Monolithic Multilayer Capacitor and Apparatus and Method of Making the Same," filed and abandoned on December 19, 1983.
No. 4,49 issued on February 12, 1985 entitled "Capacitor having dielectric material composed of multifunctional acrylate polymer and method for manufacturing the same"
No. 9,520, issued on December 25, 1984,
U.S. Pat. No. 4.49 entitled "Capacitor Containing a Multifunctional Acrylate Polymer as a Dielectric"
No. 0,774, published August 6, 1985 [1.
2-Alkanediol diacrylate monomers and their polymers useful as capacitor dielectrics,'' U.S. Pat. No. 4,533,710, 1985.4
U.S. Pat. No. 4,513.34 entitled "Acrylate-Containing Mixed Ester Monomers and Polymers thereof Useful as Capacitor Derivatives," issued on May 23rd.
No. 9, and U.S. Pat. No. 4,515 entitled "Multifunctional Acrylic Monomers and Their Polymers Useful as Capacitor Dielectrics," issued May 7, 1985.
．． No. 931. All of which are included herein by reference.

The second capacitor is used in various electrical circuits, such as relatively high-voltage A capacitors.
C power systems (e.g., conventional 110 volt systems), relatively low voltage (e.g., 50 volts or less) DC systems often found in printed circuits, etc. Important factors that must be considered in the manufacture of such capacitors, especially in AC systems, are volumetric efficiency, operating temperature, and dissipation factors.
n factor ) and the behavior at failure.

The development of compact electrical devices and circuits has increased volumetric efficiency,
This has led to a demand for significantly smaller capacitors with capacitance per unit volume. Monolithic capacitors have been used in such applications.

Monolithic capacitors are capacitors in which electrode layers and dielectric layers are combined together into a single structure, as opposed to, for example, metallized film capacitors in which a self-supporting film is rolled or wound into a capacitor form. Miniaturized capacitors are of extremely small dimensions to make them suitable for microcircuits. The intervening dielectric layer adversely affects the capacitance between adjacent electrodes, and the small overall size indicates a low capacitance with a small actual value, except that the number of electrode pairs and the permittivity of the dielectric directly affect the capacitance. Will. Therefore, from basic capacitor theory, a given capacitor with a very thin dielectric layer and many pairs of electrodes, i.e., a dielectric with a high dielectric constant, is designed to be a small, large capacitor with a very small active area of the electrodes. It would be possible to have substantial capacitance despite the small size.

One above-described type of monolithic multilayer capacitor is disclosed in U.S. Patent Application No. 562, incorporated herein by reference.
No. 779. The capacitor has a capacitively active portion and two electrode coupling portions, each separated from the capacitively active portion by a sloped portion. The capacitor includes a first set and a second set of electrode layers interleaved with each other, each layer of each set being in stacked and spaced apart relationship with the active area of the bare metal layer of the capacitor. It has an active region extending from and contributing to this. The electrode layers are stacked and joined at their ends in electrically contacting relationship, each layer having a sloped portion between its end and its active region that contributes to the sloped portion of the capacitor. A dielectric coating is in contact therewith between and between each adjacent pair of electrodes. The dielectric coating is of substantially uniform thickness in the capacitively active portion and tapers to zero thickness through the ramped portion.

The capacitance efficiency of capacitors, including the monolithic multilayer capacitor, is usually measured in terms of capacitance per unit capacitance. Generally, high efficiency is desired, with values of at least about 0.1 microfarads per cubic millimeter for a 50 VDC class unit being preferred.

A wide variety of dielectrics are known and currently used in commercially available capacitors. Such dielectrics include polyethylene terephthalate (commonly known as Mylar (a trademark of DuPont)), polycarbonate, polysulfone, and polypropylene. The dielectric constant of these materials is generally less than about 4. More recently, multifunctional acrylate polymers and mixtures thereof useful as dielectrics have been described in the related patent applications cited above,
Specifically described in US Pat. No. 4,499,520. The dielectric constant of these materials is also generally on the order of less than about 4.5.

According to basic capacitor theory, when the above materials are used as dielectrics, the volumetric efficiency of the capacitor can be increased by decreasing the thickness of the dielectric layer and/or by increasing the number of electrode pairs. However, both of these may have limitations depending on the type of capacitor and its intended use. Thus, there remains a desire to increase the volumetric efficiency of capacitors of a given size and construction by providing materials whose dielectric constants are lower than those of currently commercially available materials.

Therefore, the main object of the present invention is to provide a capacitor with higher capacitance per unit volume.

A related object is to provide a capacitor having a dielectric constant that is higher than previously provided dielectrics.

Another object is to provide a monolithic multilayer capacitor with high capacitance per unit volume.

Yet another more specific object is to provide a capacitor suitable for direct current applications.

These and other objects and advantages of the present invention will become apparent upon reading the detailed description. While the invention will be described in terms of preferred embodiments, it will be understood that there is no intention to limit the invention to these embodiments.

On the contrary, it is intended that all variations, modifications, and equivalents be embraced within the spirit and scope of the invention as defined in the claims.

Today's Detailed Description In accordance with the present invention, there is provided a capacitor comprising at least two electrodes separated by a dielectric member comprising at least one polymer of polyacrylate polyether prebolimer. The capacitor is characterized by a relatively high volumetric efficiency due to the increased dielectricity of the polyacrylate polyether brevolimer. Polyacrylate polyether brevolimer polymers are suitable for capacitor applications in general, but are particularly suitable for monolithic capacitor applications as described in U.S. Patent Application No. 562,779, incorporated herein by reference.

Without being bound to any particular theory of operation, it is generally believed that orientational polarization is the predominant derivatization polarization mechanism in polar polymers, such as the polyacrylate polyether brevolimer polymers described herein. Orientational polarization is believed to result from thermally activated molecular motion of polymer chains containing an asymmetric arrangement of permanent dipoles. The molecular motion and the net dipole number and strength are both dielectric constants of the molecule's dielectric constant. However, it is believed that molecular motion contributes significantly to the orientational polarization and thus to the dielectric constant of the polymeric material. This is the ability of dipoles to move and become oriented in an electric field, thus giving the molecule its dielectric properties. Thus, for example, the static permittivity of a polymer would be expected to be low, independent of the net dipole number and strength in the polymer, if the dipoles were stationary at the measured temperature.

In amorphous polymers, such as those obtained by polymerization of the polyacrylate polyether prebolimers described herein, the major transition in molecular motion occurs at the glass transition temperature (Tg') of the polymer. Large scale at Tg (
(or structural) molecular motion is frozen, resulting in significant changes in mechanical properties.

Polyacrylate polyether brevolimers are thus characterized by their high dipole character and their molecular mobility at their temperature of use, typically around room temperature (25° C.). The ether bond (C-0-C) in the main chain of the prepolymer gives intramolecular polarity, and the calyx gives the molecule dipole characteristics. Similarly, the ether linkage affords inherent chain flexibility and increased rotational freedom around the carbon-oxygen-carbon bond due to the absence of steric hindrance, so that the Tg of the polymer is relatively low. , for example at room temperature or slightly above room temperature. The polymer formed from the prepolymer is polycarbonate 1. It has the desired molecular mobility leading to a higher dielectric constant than other non-mobile polymers, such as polysulfone.

The polyacrylate polyether prebomer has the general formula (wherein R is hydrogen or an alkyl group containing 1 to 5 carbon atoms, and X is H or a dipolar group such as halogen, carbonyl or nitrile). m, n, and p can each be an integer from 0 to about 4, and the value of S can be O or an integer greater than 0. Thus, the value of S and thus the overall size of the molecule is not critical. Preferably. S should be chosen such that when the prepolymer is deposited by vapor deposition it forms a continuous film without pinholes.The value of S is approximately 2.
It is preferably less than 0.

As before, R can be hydrogen or an alkyl group containing 1 to 5 carbon atoms. Usually R is hydrogen or methyl,
Especially hydrogen. Thus, the term "acrylate" as used herein encompasses both acrylates and alpha-substituted acrylates, methacrylates and alpha-substituted methacrylates, although acrylates, i.e., where R is hydrogen, are less likely to polymerize at the rate at which they polymerize. Generally preferred because it is quick.

The values of m, n and p, ie the branch length of the branches, may depend on the components used to create the polyether backbone.

Thus, for example, when using ethylene oxide for the preparation of the polyether backbone, there are no branches. On the other hand, when fullylene oxide with three or more carbon atoms is used,
The number of carbon atoms in the branching is two carbon atoms less than the total number of carbon atoms of the alkylene oxide used to prepare the polyether. Thus, if the polyether backbone is prepared from propylene oxide, the branch length is 1
carbon atoms, and if the polyether backbone is prepared from butylene oxide, the branch chain length will be 2 carbon atoms.

Similarly, the backbone can be formed from a mixture of oxides, such as propylene oxide and ethylene oxide, to create a particular distribution of branches in the polyether backbone.

For some applications, it may be desirable to include strong dipolar groups such as halogens, carbonyls, nitriles, etc. in the prepolymer to increase the number and strength of dipoles and thus increase the overall polarity of the prepolymer. be. However, it will generally be understood that the increased polarity due to the introduction of the above groups will increase the Tg of the resulting polymer.

Thus, the above groups are preferably included provided that the Tg is not increased so much as to appreciably reduce the dielectric constant of the polymer at the temperature of use.

The dielectric constants of polymers produced from the prepolymers described herein are higher than those of polymers conventionally used as capacitor dielectrics.

The polymers disclosed herein have a dielectric constant of at least 6.

The polyacrylate polyether prepolymer is prepared by first forming a polyether polyol as known to those skilled in the art;
It can then be prepared by esterifying the polyether polyol with acrylic acid, as will also be apparent to those skilled in the art. For example, the acids and polyether polyols described above may be reacted in a suitable solvent in the presence of a small amount of an acidic esterification catalyst such as sulfuric acid, p-)luenesulfonic acid, an acidic ion exchange resin, or an acidic clay. Usually, a substoichiometric excess of acid is used, and the equivalent ratio of acid to diol is typically about 2:
1 to about 421. The above reaction is usually about 100-2
Polymerization is carried out at a temperature of about 100-150°C, with small amounts of p-methoxyphenol, 2,6-di-t-butylphenol or 2.4.6-)-t-butyl-phenol inhibiting the polymerization. It is sometimes preferred to incorporate agents into the esterification mixture. With suitable modification of the reaction conditions, acrylic acid may be replaced by functional derivatives thereof such as acrylic halides, lower alkyl esters or amides; likewise the introduction of dipolar halogen, carbonyl or nitrile residues is known to those skilled in the art. This can be done using the following techniques.

U.S. Patent Application No. 562.7 listed as related application
Polyacrylate polyether prepolymers suitable for use in the preparation of monolithic multilayer capacitors of the type described in No. It should have certain characteristics. Thus, the prepolymer should be vaporizable at the temperatures used to perform the prepolymer deposition, such as those described in U.S. Patent Application No. 562,779, and the prepolymer should be vaporizable at about It should be possible to provide it in a thin film form on the order of 1 micron or less. Further, the prepolymer is preferably curable by heat, electron beam or ultraviolet irradiation. The prepolymer is crosslinked during polymerization to provide the structural integrity needed to provide a high quality, tough dielectric. Thus, the prepolymer should be capable of being crosslinked or polymerized at a rate fast enough to be useful in the process described in US Patent Application No. 562,779 to optimize the time required to manufacture monolithic capacitors. For certain applications, such as AC capacitors, it is further desirable that the prepolymers, alone or with other monomers, form polymers with low waste factors and high thermal stability.

Thus, a wide variety of polyacrylate polyether brevolimers can be used in the manufacture of capacitors, including monolithic capacitors. Preferred polyacrylate polyether prebolimers are diethylene glycol diacrylate,
Unbranched glycol diacrylates such as triethylene glycol diacrylate, tetraethylene glycol diacrylate, etc., as well as dipropylene glycol diacrylate, tripropylene glycol diacrylate,
Includes branched glycol diacrylates such as tetrapropylene glycol diacrylate and the like.

The polyacrylate polyether brevolimers described herein can be polymerized under free radical conditions alone or in the presence of other monomers. The term "polymer" as used herein includes addition homopolymers and copolymers with one or more other monomers.

Polymerization by the radical method can be carried out in bulk, solution, suspension or emulsion by contacting the polymerization initiator with the prepolymer in the absence or presence of a diluent at a temperature of about θ to 200°C. .

Suitable initiators are benzoyl peroxide, tert-butyl hydroperoxide, acetyl peroxide, hydrogen peroxide, azobisisobutyronitrile, persulfate bisulfite, persulfate-sodium formaldehyde sulfoxylate, chloric acid. Salt-
Includes sulfites, etc.

Polymerization may also be carried out by irradiation techniques such as by ultraviolet light, electron beam or plasma irradiation.

A wide variety of polymerizable compounds can be used for copolymers with the polyacrylate polyether prebolimers.

Polymerizable copolymers include:

], allyl alcohol, methallyl alcohol, crotyl alcohol, ■-chloroallyl alcohol, 2-chloroallyl alcohol, cinnamyl alcohol, vinyl alcohol, methyl vinyl alcohol, 1-phenaryl alcohol and butenyl alcohol; and (i) (ii) acrylic acid, alpha-substituted acrylic acids (alkyl acrylic acids such as methacrylic acid, ethyl acrylic acid, propyl acrylic acid, etc.); (iii) oxalic acid, malonic acid, succinic acid, glutaric acid, acyhinic acid, pimeline; (iv) unsaturated polybasic acids such as maleic acid, fumaric acid, citraconic acid, mesaconic acid, itaconic acid, methylenemalonic acid, acetylene dicarboxylic acid, and aconitic acid; basic acids; and (v) esters of aromatic acids such as benzoic acid, phenylacetic acid, phthalic acid, terephthalic acid and benzoylphthalic acid with the above-mentioned alcohols; 2. Examples of unsaturated acids are mentioned above) and Methyl alcohol, ethyl alcohol, propyl alcohol, isopropyl alcohol, butyl alcohol, isobutyl alcohol, 5ec-butyl alcohol, tert
- esters with lower saturated alcohols such as butyl alcohol, 2-ethylhexyl alcohol and cyclohexyl alcohol) and saturated lower polyhydric alcohols such as hyethylene glycol, propylene glycol, tetramethylene glycol, neopentyl glycol and trimethylolpropane. 3. Unsaturated lower polyhydric alcohols such as butynediol and their esters with saturated and unsaturated aliphatic and aromatic monobasic and polybasic acids, examples of which are given above. 4. Esters of unsaturated acids, especially acrylic acid and methacrylic acid, with higher molecular weight mono- and polyhydroxy materials such as decyl alcohol, isodecyl alcohol, oleyl alcohol, stearyl alcohol, epoxy resins and polybutadiene-derived polyols, 5. Styrene, 0-5m-1p-chlorostyrene, bromostyrene, fluorostyrene, methylstyrene, ethylstyrene and cyanostyrene; di-, tri- and tetrachlorostyrene, promostyrene, fluorostyrene, methylstyrene, ethylstyrene, cyanostyrene; vinyl Vinyl cyclic compounds including naphthalene, vinylcyclohexane, divinylbenzene, trivinylhenzene, allylbenzene and heterocyclic compounds such as vinylfuran, vinylpyridine, vinylbenzofuran, N-vinylcarbazole, N-vinylpyrrolidine and N-vinyloxazolidone. , 6. Unsaturated ethers such as methyl vinyl ether, ethyl vinyl ether, cyclohexyl vinyl ether, octyl vinyl ether, diallyl ether, ethyl methallyl ether and allyl ethyl ether; 7. Unsaturated ketones, such as methyl vinyl ketone and ethyl vinyl ketone; 8. acrylamide; methacrylamide, N-methylacrylamide, N-phenylacrylamide, N-allylacrylamide, N-methylolacrylamide,
9. Unsaturated amides such as N-rucaprolactam, diacetone acrylamide, hydroxy-methoxylated diacetone acrylamide and 2-acrylamido-2-methylpropanesulfonic acid; 9. Unsaturated aliphatic hydrocarbons such as ethylene, propylene , butene, butadiene, isoprene, 2-chlorobutadiene and common α-olefins, 10. Unsaturated alkyl halides, such as vinyl fluoride, vinyl chloride, vinyl bromide, vinylidene chloride, vinylidene bromide, allyl chloride and allyl bromide, 11. , unsaturated acid anhydrides such as maleic anhydride, citraconic anhydride, itaconic anhydride, cis-4-cyclohexene-1,2-dicarboxylic anhydride, and bicyclo(2,2,1)-5- Hebutene-2,3-dicarboxylic anhydride, 12, cinnamyl chloride or bromide, acrylyl chloride or bromide, methacrylyl chloride or bromide,
Unsaturated acid halides such as crotonyl chloride or bromide, oleyl chloride or bromide, and fumaryl chloride or bromide; 13. Unsaturated nitriles such as acrylonitrile, methacrylonitrile and other substituted acrylonitriles.

As noted above, the prepolymers disclosed herein are suitable for dielectric compositions in capacitors due to their high volumetric efficiency and suitability for manufacturing capacitors with low waste factors, particularly at about room temperature (i.e., about 25° C.). It is extremely useful as a

Capacitors utilizing the prepolymers disclosed herein can be made with materials and arrangements known to those skilled in the art. The conductor is typically aluminum, copper, zinc, tin, stainless steel, and alloys thereof, with aluminum being preferred. For example, the invention provides a first electrode, which can be, for example, an aluminum foil, on the surface of said first electrode, for example by vacuum evaporation, roll coating, flowing, spraying, dipping, brushing, drawing down.
A dielectric coating of a polymer of polyacrylate polyether prebolimer, which can be formed by depositing a polyacrylate polyether prebolimer, optionally in solution, evaporating the solvent, and appropriately polymerizing, and the above-mentioned dielectric The capacitor includes a second electrode, preferably a thin metallized layer of aluminum, deposited on the body film. Suitable leads are attached to the first and second electrodes.

The present invention also provides a monolithic multilayer capacitor such as that described in US Pat. No. 562.799. This type of capacitor (generally referred to on pages 1 and 1 of this specification)
(as described on page 0) of the AC electrode layer and the dielectric material to obtain an AC electrode layer having portions that protrude from the stack and contact each other in electrically coupled relationship as more fully described in the above-mentioned application. It can be manufactured by depositing layers. The dielectric coating consists of a polymer of polyacrylate polyether prepolymer formed by depositing a prepolymer on the electrode and subsequently polymerizing the prepolymer. It is particularly preferred to use electron beam polymerization, since it provides rapid polymerization of the prepolymer without the need for additional curing agents, thus leading to the economical production of very thin coatings.

The following examples are illustrative of the invention and are not intended to limit it.

This example demonstrates the production of a uniform prototype capacitor using a polyacrylate polyether prepolymer, and also includes a polyacrylate prepolymer without an ether backbone for comparison purposes.

A uniform prototype capacitor is prepared by drawing down one layer of prepolymer onto an aluminum foil substrate, and then adding one layer of the above layer.
It was prepared by polymerizing it by contacting it with an electron beam at 0 megarads and depositing a layer of metallic aluminum thereon. The thickness of the aluminum foil electrode is 12.5 microns, the thickness of the dielectric layer is 3-6 microns, and the K of the deposited aluminum tFi is 300-500 (0.03-0.0
5). The area of each prototype capacitor was approximately 1 square inch.

The following prepolymers were used in Examples 1a, lb, and 1c. In Example 1a, the prepolymer was 5R
-268, which is tetraethylene glycol diacrylate. This prepolymer has a molecular weight of 302.
It has a density at 25°C of 1.115 to 1.125 and a viscosity of 5Qcps at 25°C. In Example 1b, the prepolymer is 5R-230, which is diethylene glycol diacrylate. This prepolymer has a molecular M214.25°C density of 1.1110 and a 25°C viscosity of 24 cps. In Example 1c, the prepolymer is 5R-238, which is 1.6-
Hexanediol diacrylate. This prepolymer has a molecular weight of 226.25°C and a density of 1.010 and 25°C.
It has a viscosity of 12 cps at °C. 5R-268,5R
-230 and 5R-238 are Atlantic and Richfield.

Company (Atlantic Richfield)
It is commercially available from SEITOMER Company, a subsidiary of Coa+pany.

The wastage factor D (%) of the test capacitor was measured at 60 Hz using an AC bridge, and the dielectric constant of the test capacitor dielectric was measured using Hewlett-Paracard (H
Ewlett-Packard) L CR bridge was calculated based on the measured capacitance observed at 100 Hz. Four prototype capacitors were made for each of the prepolymers. The dielectric coating thickness T) (in 2 microns), the measured capacitance (C) (in 2 nanofarads), the dielectric constant (DK), and the capacitor waste factor (D%) for each test are shown in the table below.

Table I la 5R-26814, 138, 946, 4024,
518,526,7 35,047,746,8 44,858,347,0 5--1,53,6 1b 5R-23015,36,455,9224,5
18,136,36 34,568,116,42 44,228,246,04 5--1,11,05 1c 5R-23814,665,434,3925,
065,514,84 34,935,594,79 5--0,81,10 The above data demonstrate the improved volumetric efficiency of capacitors in which the dielectric is formed from prepolymers of the type disclosed herein. . It can be seen that the dielectric constant of dielectrics made from polyacrylate polyether prepolymers is significantly greater than that of dielectrics made from acrylate prepolymers without ether linkages in the backbone of the prepolymer.

It is further seen that capacitors particularly suitable for direct current applications can be made using the polyacrylate polyether prepolymers disclosed in this invention due to the improved dielectric constant of the derivatives produced therefrom.

Similarly, depending on the dielectric waste factor, capacitors can also be made useful for alternating current applications. Thus, for the prepolymer used in Example 1a, the capacitor is satisfactory for AC applications below about 30°C, and for the prepolymer used in Example 1b, the capacitor is suitable for temperatures up to at least about 85°C. suitable for use.

Thus, as can be seen from the above description and illustrative examples, the present invention provides a capacitor with improved volumetric efficiency due to the high dielectric constant of the dielectric formed from polyacrylate polyether prepolymer. The capacitors described above are particularly suitable for direct current applications, but depending on the polyacrylate polyether prepolymer, they may be useful for some types of alternating current applications as well.

Claims (12)

[Claims] (1) Consists of at least one pair of electrodes, i.e., one pair of electrodes and more than one pair of electrodes, separated by a dielectric member, and the dielectric member has a ▲mathematical formula, chemical formula, table, etc.▼ (formula where R is hydrogen or alkyl of 1 to 5 carbon atoms, X is hydrogen or a dipolar group selected from the group consisting of halogen, carbonyl or nitrile, m, n and p
can each be an integer from 0 to about 4, and s is an integer of at least 0 provided that the value is such that the polyacrylate polyether prepolymer forms a pinhole-free continuous film when deposited. ) of at least one type of polyacrylate polyether prepolymer. (2) The capacitor according to claim (1), wherein the electrode is made of aluminum. (3) The capacitor according to claim (1), wherein the polyacrylate polyether prepolymer is an unbranched glycol diacrylate. (4) The capacitor according to claim (3), wherein the unbranched glycol diacrylate is diethylene glycol diacrylate, triethylene glycol diacrylate, or tetraethylene glycol diacrylate. (5) The capacitor according to claim (1), wherein the polyacrylate polyether prepolymer is a branched glycol diacrylate. (6) The capacitor according to claim (5), wherein the branched glycol diacrylate is dipropylene glycol diacrylate, tripropylene glycol diacrylate, or tetrapropylene glycol diacrylate. (7) A monolithic multilayer capacitor having a capacitive active part and two electrode coupling parts each separated from the active part by a sloped part, the capacitors being interleaved in a first set and a second set. electrode layers, each layer of each set having an active portion extending through and contributing to the capacitive active portion of the capacitor in stacked and spaced relation with the active areas of all other layers; and each layer has an electrode bonding end in stacked and electrically contacting relationship with the edge of the other layer in the set to form an electrode bonding portion of the capacitor, and each layer has an electrode bonding portion between its active region and the sloped portion of the capacitor. a dielectric coating between and adhering to each pair of adjacent electrode layers, the dielectric coating being substantially uniform throughout the capacitively active portion; The dielectric coating has a thickness of , X is hydrogen or a dipolar group selected from the group consisting of halogen, carbonyl and nitrile, m, n and p
can each be an integer from 0 to about 4, and s is an integer of at least 0, provided that its value is such that the prepolymer forms a pinhole-free continuous film upon deposition. A monolithic multilayer capacitor consisting of at least one polymer of polyacrylate polyether prepolymer. (8) The capacitor according to claim (7), wherein the electrode is made of aluminum. (9) The capacitor according to claim (7), wherein the polyacrylate polyether prepolymer is an unbranched glycol diacrylate. (10) The capacitor according to claim (9), wherein the unbranched glycol diacrylate is diethylene glycol diacrylate, triethylene glycol diacrylate, or tetraethylene glycol diacrylate. (11) The capacitor according to claim (7), wherein the polyacrylate polyether prepolymer is a branched glycol diacrylate. (12) The capacitor according to claim (11), wherein the branched glycol diacrylate is dipropylene glycol diacrylate, tripropylene glycol diacrylate, or tetrapropylene glycol diacrylate.