Dialkenyl-tricyclic-nonaromatic/olefin polymers

Abstract

A process is provided to produce a dialkenyl-tricyclic-nonaromatic/olefin polymer. The process comprises contacting at least one dialkenyl-tricyclic-nonaromatic compound, at least one olefin, at least one titanium complex, and at least one aluminoxane in a polymerization zone under polymerization conditions to form the dialkenyl-tricyclic-nonaromatic/olefin polymer.

Description

FIELD OF THE INVENTION

[0001] This invention is related to the field of polymers comprising a polymerized dialkenyl-tricyclic-nonaromatic compound and a polymerized olefin.

BACKGROUND OF THE INVENTION

[0002] Polymer compounds represent a very important and highly versatile material of construction. They have become truly indispensable and are essential for clothing, shelter, transportation, and many conveniences of modem living. Therefore, there is a strong market for polymers throughout the world resulting in billions of dollars of sales per year. Most plastics can be easily fabricated into various products by such processes, for example, as blow molding, injection molding, and thermoforming. There is a significant amount of research conducted to find new polymers to supply the demand for such lightweight and versatile materials.

[0003] Processes that currently form polymers comprising a dialkenyl-tricyclic-nonaromatic compound as shown in Formula I: 1

[0004] where R can be selected from the group consisting of hydrogen and alkyl groups having 1 to about 4 carbon atoms, and an olefin can produce a crosslinked polymer. Polymers that form crosslinking with each other or with other compounds can be insoluble and stable to heat. These polymers generally cannot be dissolved to allow admixture with other compounds or to flow or melt to form articles. It is desirable to produce a dialkenyl-tricyclic-nonaromatic/olefin polymer that is not crosslinked since it could be utilized for various applications.

[0005] Applicants provide such a process for producing a dialkenyl-tricyclic-nonaromatic/olefin polymer that is not crosslinked.

SUMMARY OF THE INVENTION

[0006] An object of this invention is to provide a process that produces a dialkenyl-tricyclic-nonaromatic/olefin polymer that is not crosslinked.

[0007] Another object of this invention is to provide the dialkenyl-tricyclic-nonaromatic/olefin polymer.

[0008] In accordance with one embodiment of this invention, a process to produce the dialkenyl-tricyclic-nonaromatic/olefin polymer is provided. The process comprises (or optionally, “consists essentially of”, or “consists of”) contacting:

[0009] 1) at least one dialkenyl-tricyclic-nonaromatic compound;

[0010] 2) at least one olefin;

[0011] 3) at least one titanium complex; and

[0012] 4) at least one aluminoxane;

[0013] in a polymerization zone under polymerization conditions to form the dialkenyl-tricyclic-nonaromatic/olefin polymer.

[0014] In accordance with another embodiment of this invention, the dialkenyl-tricyclic-nonaromatic/olefin polymer is provided.

[0015] In accordance with yet another embodiment of this invention, an article is produced comprising the dialkenyl-tricyclic-nonaromatic/olefin polymer.

[0016] This object, and other objects, will become more apparent to those with ordinary skill in the art after reading this disclosure.

DETAILED DESCRIPTION OF THE INVENTION

[0017] A process to produce a dialkenyl-tricyclic-nonaromatic/olefin polymer is provided. The process comprises contacting:

[0018] 1) at least one dialkenyl-tricyclic-nonaromatic compound;

[0019] 2) at least one olefin;

[0020] 3) at least one titanium complex; and

[0021] 4) at least one aluminoxane in a polymerization zone under polymerization conditions to form the dialkenyl-tricyclic-nonaromatic/olefin polymer.

[0022] The dialkenyl-tricyclic-nonaromatic compound has the formula: 2

[0023] wherein R can be selected from the group consisting of hydrogen and alkyl groups having from 1 to about 4 carbon atoms. Preferably, the dialkenyl-tricyclic-nonaromatic compound is dicyclopentadiene (DCPD).

[0024] The olefin that can be used in this invention contains from 2 to about 20 carbon atoms. However, it is more preferred when the olefin contains 2 to about 10 carbon atoms. It is most preferred when the olefin has 2 to 6 carbon atoms. Olefins can be selected from the group consisting of ethylene, propylene, butylene, pentene, and hexene. Ethylene is currently most preferred.

[0025] The dialkenyl-tricyclic-nonaromatic compound and the olefin are polymerized using at least one titanium complex. The titanium complex has the following general formula:

(X1)(X2)(X3)(X4)M1

[0026] wherein M1 is titanium;

[0027] wherein (X1) is independently selected from the group consisting of cyclopentadienyls, indenyls, fluorenyls, substituted cyclopentadienyls, substituted indenyls, and substituted fluorenyls;

[0028] wherein substituents on the substituted cyclopentadienyls, substituted indenyls, and substituted fluorenyls of (X1) are selected from the group consisting of aliphatic groups, cyclic groups, combinations of aliphatic and cyclic groups, silyl groups, alkyl halide groups, halides, organometallic groups, phosphorus groups, nitrogen groups, oxygen groups such as, alkoxides and aryloxides, silicon, phosphorus, boron, germanium, and hydrogen; and

[0029] wherein (X2), (X3), and (X4) are independently selected from the group consisting of halides, aliphatic groups, substituted aliphatic groups, cyclic groups, substituted cyclic groups, combinations of aliphatic groups and cyclic groups, combinations of substituted aliphatic groups and cyclic groups, combinations of aliphatic groups and substituted cyclic groups, combinations of substituted aliphatic groups and substituted cyclic groups, amido groups, substituted amido groups, phosphido groups, substituted phosphido groups, alkoxide groups, substituted alkoxide groups, aryloxide groups, substituted aryloxide groups, organometallic groups, and substituted organometallic groups.

[0030] Examples of suitable titanium complexes include, but are not limited to: 3

[0031] n5 cyclopentadienyl(2,6-di-tert-butyl-4-methylphenoxy)titanium(IV) dichloride; 4

[0032] bis(n5-cyclopentadienyldichlorotitanium)oxide; 5

[0033] n5-cyclopentadienyl(3,5-di-tert-butylphenoxy)titanium(IV) dichloride; and 6

[0034] n5-cyclopentadienyl(N,N-bis(trimethylsilyl)amido)titanium(IV) dichloride Preferably, the titanium complex is 7

[0035] n5-cyclopentadienyl titanium(IV) trichloride.

[0036] Aluminoxanes are cyclic or linear polymeric aluminum compounds. Cyclic aluminoxanes are represented by the formula (R—Al—O)n, and linear aluminoxanes are represented by the formula R(R—Al—O—)nAlR. R is an alkyl group having from 1 to about 5 carbon atoms per radical, such as, for example, methyl, ethyl, propyl, butyl, and pentyl, and n is an integer from 1 to about 20. Most preferably, R is methyl, and n is about 4.

[0037] The polymerization is conducted in a polymerization zone. The polymerization can be conducted in a solution polymerization process or a slurry polymerization process. A solution polymerization process is preferred. In the solution polymerization process, a hydrocarbon solvent capable of dissolving the dialkenyl-tricyclic-nonaromatic compound, olefin, titanium complex, and the dialkenyl-tricyclic-nonaromatic/olefin polymer is utilized. The solvent can be selected from the group consisting of hexane, cyclohexane, toluene, benzene, xylene, t-butylbenzene, and mixtures thereof. Preferably, the solvent is toluene.

[0038] In a solution polymerization process, the temperature is in a range of about 0° C. to about 300° C. However, it is more preferred when the temperature is in a range of about 20° C. to about 200° C., and it is most preferred when the temperature is in a range of 50° C. to 120° C.

[0039] In a solution polymerization process, the pressure is in a range of about 100 kPa to about 10000 kPa. However, it is more preferred when the pressure is in the range of about 500 kPa to about 6000 kPa, and it is most preferred when the pressure is in the range of 500 kPa to 5000 kPa.

[0040] If a slurry polymerization process is utilized, it is preferred to use a loop slurry reactor. These reactors are well known in the polyethylene polymerization art.

[0041] The dialkenyl-tricyclic-nonaromatic/olefin polymer produced by this process comprises about 0.1 to about 90 weight percent polymerized dialkenyl-tricyclic-nonaromatic compound based on the weight of the dialkenyl-tricyclic-nonaromatic/olefin polymer. However, it is more preferred when the dialkenyl-tricyclic-nonaromatic/olefin polymer produced by this process comprises about 20 to about 90 weight percent polymerized dialkenyl-tricyclic-nonaromatic compound based on the weight of the dialkenyl-tricyclic-nonaromatic/olefin polymer, and it is most preferred when the dialkenyl-tricyclic-nonaromatic/olefin polymer produced by this process comprises 40 to 80 weight percent polymerized dialkenyl-tricyclic-nonaromatic based on the weight of the dialkenyl-tricyclic-nonaromatic/olefin polymer.

[0042] In a more specific embodient of this invention, a process is provided to produce an ethylene/DCPD polymer. The process comprises contacting n5-cyclopentadienyl titanium(IV) trichloride, ethylene, dicyclopentadiene, and methylaluminoxane in a solution polymerization process to produce the ethylene/DCPD polymer.

[0043] The dialkenyl-tricyclic-nonaromatic/olefin polymer produced is not crosslinked. There is no ring opening as a result of the polymerization reaction. The non-crosslinking of the dialkenyl-tricyclic-nonaromatic/olefin polymer is indicated by its ability to dissolve in a solvent at 70° C., such as, for example, trichlorobenzene. Crosslinked polymers typically can be insoluble even at higher temperature. Further evidence of no crosslinking is the nuclear magnetic resonance (NMR) spectrum of the dialkenyl-tricyclic-nonaromatic/olefin polymer shows peaks in the olefinic region of the spectrum which confirms the fact that the non-reacting double bond is still intact. In addition, the spectrum shows that the 5,6-double bond (i.e norbornene ring alkenyl constituent) is the one that is polymerizing.

[0044] Divinyl-dicyclo-nonaromatic/olefin polymers can be utilized to produce package film, medical equipment, such as syringes or vials, and optical equipment, such as data storage media, industrial lenses, ophthalmic lenses, projection lenses, automotive lenses, and lamp reflectors.

EXAMPLES

[0045] Polymerization Process

[0046] The following polymerization procedure was utilized in all of the examples. First, varying amounts of 86 to 98 wt % DCPD in toluene were charged to a dry, 1 gallon reactor, which was then heated to 70° C. The specific amounts of DCPD used are specified in Table 1. In Examples 1-10, 200 milliliters of polymerization grade toluene were charged to the reactor; however in Examples 11-12, the 200 milliliters of toluene were not added. Then, the reactor was pressured to 150 psig with ethylene and then depressured. This pressure/depressure cycle was completed three times. Ethylene was then charged to maintain a pressure of 100 psig in the reactor. Then, the ethylene pressure was increased to 300 psig and maintained for 15 minutes while the reactor was stirred. The ethylene flow was then stopped, and the reactor was vented to 50 or 100 psig. 10-30 milliliters of 10 wt % methylaluminoxane (MAO) in toluene and 0.01 to 0.04 grams of a titanium complex were then charged to the reactor. The ethylene flow to the reactor was re-established at between 50 and 300 psig and maintained for between 60 to 90 minutes to produce an ethylene/dicyclopentadiene polymer mixture comprising ethylene/dicyclopentadiene polymer, toluene, and unreacted ethylene and DCPD. The ethylene flow was then stopped by adding 5 milliliters of methanol, and the reactor was allowed to cool. The ethylene/dicyclopentadiene polymer mixture was then washed and dried in a vacuum oven at 50° C. In some examples, 5 milliliters of an antioxidant solution were also added to the ethylene/dicyclopentadiene polymer mixture prior to drying. The antioxidant solution contained 10 weight percent tris(p-nonylphenyl)phosphite (TNPP) and 40 weight percent tetrakis(methylene(3,5-di-tert-butyl-4-hydroxyhydrocinnamate in cyclohexane. The TNPP was obtained from GE Specialty Chemicals in Parkersburg, W. Va. The tetrakis(methylene(3,5-di-tert-butyl-4-hydroxyhydrocinnamate was obtained as Irganox® 1076 from Ciba-Geigy Corporation in Hawthorne, N.Y.

Example 1

[0047] In this example, n5-cyclopentadienyl(2,6-di-tert-butyl-4-methylphenoxy)titanium(IV) dichloride was used to polymerize ethylene and 50 grams of 98% by weight DCPD in toluene by the polymerization procedure discussed previously. 10 milliliters of 10 wt % MAO in toluene were added during this polymerization. 212 grams of an ethylene/dicyclopentadiene polymer mixture were obtained. The ethylene/dicyclopentadiene mixture then was dried in a vacuum oven to yield an ethylene/dicyclopentadiene polymer with a dry weight of 0.8 grams. The activity of the n5-cyclopentadienyl(2,6-di-tert-butyl-4-methylphenoxy)titanium(IV) dichloride was 80 grams of ethylene/dicyclopentadiene polymer per gram of n5-cyclopentadienyl(2,6-di-tert-butyl-4-methylphenoxy)titanium(IV) dichloride per hour.

Example 2

[0048] In this example, n5-cyclopentadienyl(2,6-di-tert-butyl-4-methylphenoxy)titanium(IV) dichloride was used again to polymerize ethylene and DCPD in toluene as in Example 1 except during this experiment 110 grams of 91.5% by weight DCPD in toluene were added to the reactor. 26.3 grams of an ethylene/dicyclopentadiene polymer mixture were obtained. The ethylene/dicyclopentadiene polymer mixture was washed with 1% by weight HCl, then washed with water, and finally the ethylene/dicyclopentadiene polymer was washed with acetone. The ethylene/dicyclopentadiene polymer was dried in a vacuum oven to a dry weight of 2.9 grams yielding an activity of 290 grams of ethylene/dicyclopentadiene polymer per gram of n5-cyclopentadienyl(2,6-di-tert-butyl-4-methylphenoxy)titanium(IV) dichloride per hour.

Example 3

[0049] In this example, n5-cyclopentadienyl(2,6-di-tert-butyl-4-methylphenoxy)titanium(IV) dichloride was used to polymerize ethylene and DCPD as in Example 2 except during this polymerization 30 milliliters of 10 wt % MAO in toluene were added to the reactor. In addition, the antioxidant solution discussed previously was added to the ethylene/dicyclopentadiene polymer mixture. Soft white ethylene/dicyclopentadiene polymer was produced. The ethylene/dicyclopentadiene polymer mixture was washed with 1% by weight HCl and then washed with acetone. The polymer was dried in a vacuum oven to a dry weight of 35.6 grams yielding an activity of 3560 grams of ethylene/dicyclopentadiene polymer per gram of n5-cyclopentadienyl(2,6-di-tert-butyl-4-methylphenoxy)titanium(IV) dichloride per hour.

Example 4

[0050] Bis(n5-cyclopentadienyldichlorotitanium) oxide was used for this polymerization. 30 milliliters of 10 wt % MAO in toluene and 110 grams of 91.5 wt % DCPD in toluene were added to the reactor. Fluff type polymer was produced. The ethylene/dicyclopentadiene polymer mixture was washed with acetone and dried in a vacuum oven to produce a dry weight of 51.4 grams. This catalyst had an activity of 5140 grams of ethylene/dicyclopentadiene polymer per gram of bis(n5-cyclopentadienyldichlorotitanium) oxide per hour.

Example 5 & 6

[0051] In Example 5, n5-cyclopentadienyl(3,5-di-tert-butylphenoxy)titanium(IV) dichloride was used for this polymerization. 30 milliliters of 10 wt % MAO in toluene and 118 grams of 85 wt % DCPD in toluene were added to the reactor. Fluff type polymer was produced. The ethylene/dicyclopentadiene polymer mixture was washed with methanol and contacted with 5 milliliters of antioxidant solution. The ethylene/dicyclopentadiene polymer mixture was then dried in a vacuum oven to produce a dry weight of 13.9 grams. This catalyst had an activity of 1390 grams of ethylene/dicyclopentadiene polymer per gram of n5-cyclopentadienyl(3,5-di-tert-butylphenoxy)titanium(IV) dichloride per hour.

[0052] The experiment in Example 5 was repeated in Example 6 except the ethylene/dicyclopentadiene polymer mixture was washed with toluene and then acetone. It was then dried in a vacuum oven to produce 46.7 grams of dry polymer which yielded an activity of 4650 grams of ethylene/dicyclopentadiene polymer per gram of n5-cyclopentadienyl(3,5-di-tert-butylphenoxy)titanium(IV) dichloride per hour.

Example 7 & 8

[0053] Bis(n5-cyclopentadienyldichlorotitanium) oxide was used for this polymerization. 30 milliliters of 10 wt % MAO in toluene and 118 grams of 85 wt % DCPD in toluene were added to the reactor. The ethylene/dicyclopentadiene polymer mixture was dried in a vacuum oven to produce a dry weight of 41.4 grams. This catalyst had an activity of 4140 grams of ethylene/dicyclopentadiene polymer per gram of bis(n5-cyclopentadienyldichlorotitanium) oxide per hour.

[0054] Example 7 was repeated. The ethylene/dicyclopentadiene polymer mixture produced was washed with acetone, then toluene, then finally with methanol. The ethylene/dicyclopentadiene polymer mixture was then dried in a vacuum oven. This polymerization produced 24.9 grams of polymer yielding an activity of 2490 grams of ethylene/dicyclopentadiene polymer per gram of bis(n5-cyclopentadienyldichlorotitanium) oxide per hour.

Example 9

[0055] In this example, n5-cyclopentadienyl(N,N-bis(trimethylsilyl)amido)titanium(IV) dichloride was used for this polymerization. 30 milliliters of 10 wt % MAO in toluene and 118 grams of 85 wt % DCPD in toluene were added to the reactor. 314 grams of an ethylene/dicyclopentadiene polymer mixture were produced. The polymer mixture was dried in a vacuum oven to produce a dry weight of 6.1 grams yielding an activity of 610 grams of ethylene/dicyclopentadiene polymer per gram of n5-cyclopentadienyl(N,N-bis(trimethylsilyl)amido)titanium(IV) dichloride per hour.

Example 10

[0056] In this example, bis(n5-cyclopentadienyldichlorotitanium) oxide was used for this polymerization. 120 milliliters of 10 wt % MAO in toluene and 472 grams of 85 wt % DCPD in toluene were added to the reactor. The ethylene/dicyclopentadiene polymer mixture was washed three times with acetone and then three times with methanol. It was then dried in a vacuum oven to produce 119 grams of dry polymer which yielded an activity of 2975 grams of ethylene/dicyclopentadiene polymer per gram of bis(n5-cyclopentadienyldichlorotitanium) oxide per hour.

Example 11

[0057] In this example, n5-cyclopentadienyl(3,5-di-tert-butylphenoxy)titanium(IV) dichloride was used for this polymerization. 30 milliliters of 10 wt/o MAO in toluene and 300 grams of 89.2 wt % DCPD in toluene were added to the reactor. The ethylene/dicyclopentadiene polymer mixture was washed twice with acetone. It was then dried in a vacuum oven to produce 38.90 grams of dry polymer which yielded an activity of 5210 grams of ethylene/dicyclopentadiene polymer per gram of n5-cyclopentadienyl(3,5-di-tert-butylphenoxy)titanium(IV) dichloride per hour.

Example 12

[0058] In this example, n5-cyclopentadienyl(3,5-di-tert-butylphenoxy)titanium(IV) dichloride was used for this polymerization. 30 milliliters of 10 wt % MAO in toluene and 300 grams of 86.8 wt % DCPD in toluene were added to the reactor. The ethylene/dicyclopentadiene polymer mixture was washed with acetone. It was then dried in a vacuum oven to produce 19.88 grams of dry polymer which yielded an activity of 4580 grams of ethylene/dicyclopentadiene polymer per gram of n5-cyclopentadienyl(3,5-di-tert-butylphenoxy)titanium(IV) dichloride per hour.

Example 13

[0059] In this example, n5-cyclopentadienyl titanium (IV) trichloride was used for this polymerization. 30 milliliters of 10 weight percent MAO in toluene, 100 grams of 97.96 weight percent DCPD in toluene and 200 milliliters of toluene were added to the reactor. The ethylene/dicyclopentaidene polymer mixture produced was washed with acetone. It was then dried in a vacuum oven to produce 118.90 grams of dry polymer which yielded an activity of 11890 grams of ethylene/dichclopentadiene polymer per gram of n5-cyclopentadienyl titanium (IV) trichloride per hour.

Example 14

[0060] In this example, n5-cyclopentadienyl titanium (IV) trichloride was used for this polymerization. 30 milliliters of 10 weight percent MAO in toluene, 270 grams of 97.96 weight percent DCPD and 30 ml toluene were added to the reactor. The ethylene/dicyclopentadiene polymer mixture was washed three times with methanol. It was then dried in a vacuum oven to produce 91.70 grams of dry polymer which yielded an activity of 9170 grams of ethylene/dicyclopentadiene polymer per gram of n5-cyclopentadienyl titanium (IV) trichloride per hour. 1 TABLE I Titanium Complex Wt. % of Titanium Amount MAO Ethylene DCPD Temp. Toluene Polymer DCPD Example Complex (g) (ml) (psig) (g) (° C.) (ml) (g) in Polymer Activity* 1 Catalyst 1 0.01 10 300 50 70 200 0.8 80 2 Catalyst 1 0.01 10 300 110 70 200 2.9 290 3 Catalyst 1 0.01 30 300 110 70 200 35.6 12.6 3560 4 Catalyst 2 0.01 30 300 110 70 200 51.4 5140 5 Catalyst 3 0.01 30 300 118 70 200 13.9 1390 6 Catalyst 3 0.01 30 300 118 70 200 46.7 4650 7 Catalyst 2 0.01 30 300 118 70 200 41.4 26.2 4140 8 Catalyst 2 0.01 30 300 118 70 200 24.9 13.6 2490 9 Catalyst 4 0.01 30 300 118 70 200 6.1 610 10 Catalyst 2 0.04 120 300 472 70 1200 119 23.4 2975 11 Catalyst 3 0.01 30 100 300 70 0 38.9 52.1 5210 12 Catalyst 3 0.01 30 50 300 70 0 19.88 45.8 4580 13 Catalyst 5 0.01 30 300 100 70 200 118.90 — 11890 14 Catalyst 5 0.01 30 300 270 70 30 91.7 — 9170 Catalyst 1 = n5-cyclopentadienyl(2,6-di-tert-butyl-4-methylphenoxy)titanium(IV) dichloride Catalyst 2 = bis(n5-cyclopentadienyldichlorotitanium) oxide Catalyst 3 = n5-cyclopentadienyl(3,5-di-tert-butylphenoxy)titanium(IV) dichloride Catalyst 4 = n5-cyclopentadienyl(N,N-bis(trimethylsilyl)amido)titanium(IV) dichloride Catalyst 5 = n5-cyclopentadienyl titanium (IV) trichloride *grams of polymer per gram of titanium complex per hour

[0061] While this invention has been described in detail for the purpose of illustration, it is not intended to be limited thereby but is intended to cover all changes and modifications within the spirit and scope thereof.

Claims

1. A process to produce a dialkenyl-tricyclic-nonaromatic/olefin polymer said process comprising contacting at least one dialkenyl-tricyclic-nonaromatic compound, at least one olefin, at least one titanium complex catalyst, and at least one aluminoxane in a polymerization zone under polymerization conditions to form said polymer;

wherein said dialkenyl-tricyclic-nonaromatic compound has the formula:

8

wherein R is selected from the group consisting of hydrogen and alkyl groups having from 1 to about 4 carbon atoms;

wherein said titanium complex has the following general formula:

(X1)(X2)(X3)(X4)M1

wherein M1 is titanium;

wherein (X1) is independently selected from the group consisting of cyclopentadienyls, indenyls, fluorenyls, substituted cyclopentadienyls, substituted indenyls, and substituted fluorenyls;

wherein substituents on the substituted cyclopentadienyls, substituted indenyls, and substituted fluorenyls of (X1) are selected from the group consisting of aliphatic groups, cyclic groups, combinations of aliphatic and cyclic groups, silyl groups, alkyl halide groups, halides, organometallic groups, phosphorus groups, nitrogen groups, oxygen groups, such as alkoxides and aryloxides, silicon, phosphorus, boron, germanium, and hydrogen;

wherein (X2), (X3), and (X4) are independently selected from the group consisting of halides, aliphatic groups, substituted aliphatic groups, cyclic groups, substituted cyclic groups, combinations of aliphatic groups and cyclic groups, combinations of substituted aliphatic groups and cyclic groups, combinations of aliphatic groups and substituted cyclic groups, combinations of substituted aliphatic groups and substituted cyclic groups, amido groups, substituted amido groups, phosphido groups, substituted phosphido groups, alkoxide groups, substituted alkoxide groups, aryloxide groups, substituted aryloxide groups, organometallic groups, and substituted organometallic groups.

2. A process according to claim 1 wherein said olefin contains 2 to about 10 carbon atoms.

3. A process according to claim 2 wherein said dialkenyl-tricyclic-nonaromatic compound is dicyclopentadiene.

4. A process according to claim 3 wherein said olefin is ethylene.

5. A process according to claim 4 wherein said titanium complex is selected from the group consisting of n5-cyclopentadienyl(2,6-di-tert-butyl-4-methylphenoxy)titanium(IV) dichloride, bis(n5-cyclopentadienyldichlorotitanium) oxide, n5-cyclopentadienyl(3,5-di-tert-butylphenoxy)titanium(IV) dichloride, and n5-cyclopentadienyl(N,N-bis(trimethylsilyl)amido)titanium(IV) dichloride, and n5-cyclopentadienyl titanium (IV) trichloride, and mixtures thereof.

6. A process according to claim 5 wherein said polymerization zone is a solution process or a slurry process.

7. A process to produce an ethylene/dicyclopentadiene polymer comprising contacting:

1) n5-cyclopentadienyl titanium(IV) trichloride

2) ethylene;

3) dicyclopentadiene; and

4) methylaluminoxane;

in a solution polymerization process under polymerization conditions to produce said ethylene/dicyclopentadiene polymer.

8. A polymer produced by claim 1.

9. A polymer produced by claim 7.

10. A dialkenyl-tricyclic-nonaromatic/olefin polymer consisting essentially of at least one polymerized dialkenyl-tricyclic-nonaromatic compound and at least one polymerized olefin.

11. A dialkenyl-tricyclic-nonaromatic/olefin polymer according to claim 10 wherein said at least one polymerized dialkenyl-tricyclic-nonaromatic compound is dicyclopentadiene and wherein said at least one polymerized olefin is ethylene.

12. A normally solid ethylene/dicyclopentadiene polymer characterized by being soluble at 70° in toluene.

13. An article produced from the polymer of claim 10.

14. An article produced from the polymer of claim 11.