EP0074194A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Propylene-ethylene random copolymer, production process thereof, and film derived therefrom
Assignee: Resonac Holdings Corp
•
Filing: 1982-08-16
•
Granted: —
•
Expires: 2002-08-16
Abstract
Abstract A propylene-ethylene random copolymer having a following characteristics: (a) a melting point of 115°C to 140°C; (b) an ethylene content, determined by the C 13 -NMR method, of 6 to 20 mol%; (c) a block index, calculated according to the C 13 -NMR method, of 1.1 or less; (d) an MFI, determined at 230°C under a load of 2.16 kg, of 0.5 to 100 g/10 min; and (e) a ratio of the MLMFI, determined at 230°C under a load of 10.0 kg, to the MFI, determined at 230°C under a load of 2.16 kg, of 10 to 16. This random copolymer has a low melting point, and, when a film is molded therefrom, a film having an excellent transparency and moldability, and an excellent impact resistance, especially at a low temperature, and low-temperature heatsealability is obtained.
Inventors
- 👤 Kiwami Hirota
- 👤 Hideki Tamano
- 👤 Fumio Sakaguchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 02:56
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08F; C08F210/00; C08F210/04; C08F210/06; C08F210/16; C08F8/00; C08F8/50; C08F2800/00; C08F2800/10; C08F2810/00; C08F2810/10; C08J2323/00; C08J2323/02; C08J2323/16
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
98 words
A propylene-ethylene random copolymer having the following characteristics: (a) a melting point of 115°C to 140°C; (b) an ethylene content, determined by the C 13 -NMR method, of 6 to 20 mol %; (c) a block index, calculated according to the C 13- NMR method, of 1.1 or less; (d) an MFI, determined at 230°C under a load of 2.16 kg, of 0.5 to 100 g/10 min; (e) a ratio of the MLMFI, determined at 230°C under a load of 10.0 kg, to the MFI, determined at 230°C under a load of 2.16 kg, of 10 to 16.
Claim 2
Dependent Claim
98 words
A propylene-ethylene random copolymer having the following characteristics: (a) a melting point of 115°C to 140°C; (b) an ethylene content, determined by the C 13 -NMR method, of 6 to 20 mol %; (c) a block index, calculated according to the C 13- NMR method, of 1.1 or less; (d) an MFI, determined at 230°C under a load of 2.16 kg, of 0.5 to 100 g/10 min; (e) a ratio of the MLMFI, determined at 230°C under a load of 10.0 kg, to the MFI, determined at 230°C under a load of 2.16 kg, of 10 to 16.
Claim 3
Dependent Claim
36 words
A copolymer as claimed in claim 1, wherein said copolymer further contains at least one alpha-olefin having the general formula: CH 2 = CHR wherein R is an alkyl group having 2 to 10 carbon atoms.
Claim 4
Dependent Claim
157 words
A process for producing a propylene-ethylene random copolymer comprising the steps of: copolymerizing propylene and ethylene in the presence of a Ziegler-type catalyst to form a random copolymer having an MFI, determined at 230°C under a load of 2.16 kg, of 0.01 to 0.3 g/10 min; and visbreaking the resultant copolymer in the presence of a peroxide to form a random copolymer having the following characteristics: (a) a melting point of 115°C to 140°C; (b) an ethylene content, determined by the C 13 -NMR method, of 6 to 20 mol %; (c) a block index, calculated according to the C 13 -NMR method, of 1.1 or less; (d) an MFI, determined at 230°C under a load of 2.16 kg, of 0.5 to 100 g/10 min; and (e) a ratio of the MLMFI, determined at 230°C under a load of 10.0 kg, to the MFI, determined at 230°C under a load of 2.16 kg, of 10 to 16;
Claim 5
Dependent Claim
157 words
A process for producing a propylene-ethylene random copolymer comprising the steps of: copolymerizing propylene and ethylene in the presence of a Ziegler-type catalyst to form a random copolymer having an MFI, determined at 230°C under a load of 2.16 kg, of 0.01 to 0.3 g/10 min; and visbreaking the resultant copolymer in the presence of a peroxide to form a random copolymer having the following characteristics: (a) a melting point of 115°C to 140°C; (b) an ethylene content, determined by the C 13 -NMR method, of 6 to 20 mol %; (c) a block index, calculated according to the C 13 -NMR method, of 1.1 or less; (d) an MFI, determined at 230°C under a load of 2.16 kg, of 0.5 to 100 g/10 min; and (e) a ratio of the MLMFI, determined at 230°C under a load of 10.0 kg, to the MFI, determined at 230°C under a load of 2.16 kg, of 10 to 16;
Claim 6
Dependent Claim
55 words
A process as claimed in claim 3, wherein said random copolymer further contains one or more alpha-olefins having the general formula: C H 2 = CHR wherein R is an alkyl group having 2 to 10 carbon atoms, and is produced by copolymerization of propylene with one or more said alpha-olefins in addition to ethylene.
Claim 7
Dependent Claim
18 words
A process as claimed in claim 3, wherein said copolymerization is carried out in a liquid monomer solvent.
Claim 8
Dependent Claim
29 words
A process as claimed in claim 3, wherein said peroxide has a half life decomposition time of one second to 10 minutes at the melting point of the copolymer.
Claim 9
Dependent Claim
41 words
A process as claimed in claim 3, wherein visbreaking is carried out at a temperature of 180°C to 300°C in the presence of 0.002 to 0.5 parts by weight of the peroxide, based on 100 parts by weight of the copolymer.
Claim 10
Dependent Claim
107 words
A water-cooling tubular film derived from a propylene-ethylene random copolymer having the following characteristics: (a) a melting point of 115°C to 140°C; (b) an ethylene content, determined by the C 13- N MR method, of 6 to 17 mol%; (c) a block index, calculated according to the C 13- NMR method, of 1.1 or less; (d) an MFI, determined at 230°C under a load of 2.16 kg, of 1 to 30 g/10 min; and (e) a ratio of the MLMFI, determined at 230°C under a load of 10.0 k g , to the MFI, determined at 230°C under a load of 2.16 kg, of 10 to 16.
Claim 11
Dependent Claim
107 words
A water-cooling tubular film derived from a propylene-ethylene random copolymer having the following characteristics: (a) a melting point of 115°C to 140°C; (b) an ethylene content, determined by the C 13- N MR method, of 6 to 17 mol%; (c) a block index, calculated according to the C 13- NMR method, of 1.1 or less; (d) an MFI, determined at 230°C under a load of 2.16 kg, of 1 to 30 g/10 min; and (e) a ratio of the MLMFI, determined at 230°C under a load of 10.0 k g , to the MFI, determined at 230°C under a load of 2.16 kg, of 10 to 16.
Claim 12
Dependent Claim
104 words
A T-die cast film derived from a propylene--ethylene random copolymer having the following characteristics: (a) a melting point of 115°C to 140°C; (b) an ethylene content, determined by the C 13 -NMR method, of 6 to 15 mol%; (c) a block index, calculated according to the C 13 -NMR method, of 1.1 or less; (d) an MFI, determined at 230°C under a load of 2.16 kg, of 0.5 to 50 g/10 min; and (e) a ratio of the MLMFI, determined at 230°C under a load of 10.0 kg, to the MFI, determined at 230°C under a load of 2.16 kg, of 10 to 16.
Claim 13
Dependent Claim
104 words
A T-die cast film derived from a propylene--ethylene random copolymer having the following characteristics: (a) a melting point of 115°C to 140°C; (b) an ethylene content, determined by the C 13 -NMR method, of 6 to 15 mol%; (c) a block index, calculated according to the C 13 -NMR method, of 1.1 or less; (d) an MFI, determined at 230°C under a load of 2.16 kg, of 0.5 to 50 g/10 min; and (e) a ratio of the MLMFI, determined at 230°C under a load of 10.0 kg, to the MFI, determined at 230°C under a load of 2.16 kg, of 10 to 16.
Claim 14
Dependent Claim
129 words
A composite film comprising a first layer derived from crystalline polypropylene and a second layer laminated on one or both sides of the first layer, said second layer being derived from a propylene-ethylene random copolymer having the following characteristics: (a) a melting point of 115°C to 135°C; (b) an ethylene content, determined by the C 13- NMR method, of 10 to 17 mol%; (c) a block index, calculated according to the C 13 -NMR method, of 1.1 or less; (d) an MFI, determined at 230°C under a load of 2.16 kg, of 1 to 60 g/10 min; and (e) a ratio of the MLMFI, determined at 230°C under a load of 10.0 kg, to the MFI, determined at 230°C under a load of 2.16 kg, of 10 to 16.
Claim 15
Dependent Claim
129 words
A composite film comprising a first layer derived from crystalline polypropylene and a second layer laminated on one or both sides of the first layer, said second layer being derived from a propylene-ethylene random copolymer having the following characteristics: (a) a melting point of 115°C to 135°C; (b) an ethylene content, determined by the C 13- NMR method, of 10 to 17 mol%; (c) a block index, calculated according to the C 13 -NMR method, of 1.1 or less; (d) an MFI, determined at 230°C under a load of 2.16 kg, of 1 to 60 g/10 min; and (e) a ratio of the MLMFI, determined at 230°C under a load of 10.0 kg, to the MFI, determined at 230°C under a load of 2.16 kg, of 10 to 16.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.