Back to results
US 4,366,296 AGranted
Unsaturated copolymers
AssigneeMitsubishi Petrochemical Co., Ltd.
InventorsSadao Kitagawa, Isao Okada
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeMitsubishi Petrochemical Co., Ltd.
InventorsSadao Kitagawa, Isao Okada
Estimating the term…
A thermoplastic, substantially resinous, unsaturated, random copolymer of ethylene, propylene or 4-methyl-1-pentene with a branched 1,4-diene of the formula ##STR1## wherein R.sup.1 is an alkyl group of a maximum of 8 carbon atoms, and each of R.sup.2 and R.sup.3 is hydrogen or an alkyl of a maximum of 8 carbon atoms, exclusive of the case where both R.sup.2 and R.sup.3 are both hydrogen.
A thermoplastic, substantially resinous, unsaturated copolymer which is a random copolymer of an .alpha.-olefin selected from one member of the group consisting of ethylene, propylene, and 4-methyl-1-pentene with a branched 1,4-diene of the formula ##STR5## wherein R.sup.1 is an alkyl group of at the most 8 carbon atoms, and each of R.sup.2 and R.sup.3 is hydrogen or an alkyl group of at the most 8 carbon atoms, the case where R.sup.2 and R.sup.3 are both hydrogen being excluded, said copolymer having a content of said branched 1,4-diene of 0.01 to 20 mol percent, an initial modulus of elasticity of 500 to 100,000 kg.f./cm..sup.2 and a melt index of at the most 500 grams/10 minutes.
A process for producing a thermoplastic, substantially resinous, unsaturated copolymer which is a random copolymer of an .alpha.-olefin selected from one member of the group consisting of ethylene, propylene, and 4-methyl-1-pentene with a branched 1,4-diene, said process comprising
A thermoplastic, substantially resinous, unsaturated copolymer which is a substantially random copolymer of propylene and a branched 1,4-diene of the formula ##STR7## wherein R.sup.1 is an alkyl group of at the most 8 carbon atoms, and each of R.sup.2 and R.sup.3 is hydrogen or an alkyl group of at the most 8 carbon atoms, the case where R.sup.2 and R.sup.3 are both hydrogen being excluded, wherein prior to copolymerization, propylene is caused to undergo homopolymerization in a quantity of about 0.25 to 3 percent by weight of the total polymer and said copolymer has a content of said branched 1,4-diene of about 0.01 to 20 mol. percent, an initial modulus of elasticity of 500 to 100,000 kg./f./cm..sup.2 and a melt index of at the most 500 grams/10 minutes.
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
From the US filing history. Foreign family members aren’t listed.
Copolymers of ethene with alpha-alkenes, e.g. EP rubbers: with non-conjugated dienes, e.g. EPT rubbers
Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond: ethene
Monomers containing three or four carbon atoms: propene
Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
Term ended 6 Jun 2000 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Technical field
The present invention relates to a resinous unsaturated copolymer prepared by the random copolymerization of ethylene, propylene, or 4-methyl-1-pentene with a particular branched 1,4-diene.
It is well known that because of its excellent properties, a polymer consisting of ethylene or propylene only or a copolymer comprising ethylene or propylene and an .alpha.-olefin has been widely used in various fields.
In the drawing:
FIG. 1 is a graph indicating certain results of Example C1 (curve 1) and Reference Example C1 (curve 2); and
FIG. 2 is a graph indicating certain results of Example C3 (curve 3) and Reference Example C2 (curve 4).
The unsaturated copolymer of the present invention has a structure in which ethylene units, propylene units, or 4-methyl-1-pentene units and comonomer units of formula (I') derived from a branched 1,4-diene of formula (I) are randomly arranged. ##STR3##
The content of the comonomer units (I') contained in the propylene or 4-methyl-1-pentene copolymer is 30 mole % or less, preferably from 0.01 to 20 mole %, more preferably from 0.05 to 10 mole %. The remainder consists essentially of propylene units or 4-methyl-1-pentene units. The content of the comonomer units (I') contained in the ethylene copolymer is 30 mole % or less, particularly from 0.01 to 20 mole %, preferably from 0.05 to 15 mole %, more preferably from 0.1 to 10 mole %. The remainder consists essentially of ethylene units.
This copolymer has a molecular weight of 500 g/10 min. or less, preferably from 0.001 to 200 g/10 min., more preferably from 0.01 to 100 g/10 min. in terms of the melt index, as measured according to the procedure of ASTM D1238.