Unsaturated ethylene-non conjugated diene copolymers and preparation thereof by radical polymerization
First Claim
1. A method of producing, by radical polymerization through a high pressure process, an unsaturated copolymer of ethylene and at least one monomer which is copolymerizable with ethylene;
- said method including a step of;
(a) providing during the copolymerization at least one monomer which is copolymerizable with ethylene and, which is a polyunsaturated compound selected from the group consisting of 1,7-octadiene, 1,9-decadiene and 1,13-tetradecadiene.
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Accused Products
Abstract
The invention concerns an unsaturated ethylene copolymer, a method for producing the ethylene copolymer, and the use of the ethylene copolymer in compositions for producing cross-linked structures, such as material for electric cables. In the method, ethylene and at least one monomer which is copolymerizable with ethylene and includes a polyunsaturated comonomer having a chain of at least 8 carbon atoms and at least 2 non-conjugated double bonds, of which at least one is terminal, are polymerized at a pressure of about 100-300 MPa and a temperature of about 80°-300° C. under the action of a radical initiator. The polyunsaturated comonomer preferably is an α,ω-alkadiene having 8-16 carbon atoms, most preferred 1,9-decadiene. Apart from the polyunsaturated comonomer, polymerization may also involve another vinyl-unsaturated monomer, preferably containing at least one functional group selected from hydroxyl groups, alkoxy groups, carbonyl groups, carboxyl groups and ester groups. The ethylene copolymers produced have an increased degree of unsaturation, which can be used for cross-linking the ethylene copolymer or grafting reactive groups.
89 Citations
18 Claims
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1. A method of producing, by radical polymerization through a high pressure process, an unsaturated copolymer of ethylene and at least one monomer which is copolymerizable with ethylene;
- said method including a step of;
(a) providing during the copolymerization at least one monomer which is copolymerizable with ethylene and, which is a polyunsaturated compound selected from the group consisting of 1,7-octadiene, 1,9-decadiene and 1,13-tetradecadiene. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- said method including a step of;
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10. A method of preparing an unsaturated copolymer of ethylene comprising:
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radical copolymerizing a mixture including ethylene and a polyunsaturated comonomer under high pressure to produce a first copolymer; wherein the polyunsaturated comonomer has an unsubstituted straight carbon chain of ten to fourteen carbon atoms which is free from any heteratom;
the polyunsaturated comonomer including at least four carbon atoms between two, non-conjugated, double bonds;
wherein at least one double bond is a terminal double bond. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification