EP0428972A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Moulded articles of syndiotactic polypropylene and method for preparing same
Assignee: Mitsui Chemicals Inc
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Filing: 1990-11-12
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Granted: —
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Expires: 2010-11-12
Abstract
Abstract A molded article of a syndiotactic polypropylene having excellent transparency in which a melting point attributed to the polypropylene having the syndiotactic structure measured at a heating rate of 10°C/minute by differential scanning thermal analysis is represented by a substantially single peak, the aforesaid molded article being prepared by heating, melting and then hot-molding a homopolymer of propylene or a copolymer of propylene and a small amount of another olefin, which have a substantially syndiotactic structure, or a mixture of the homopolymer or the copolymer and a small amount of a polypropylene having a substantially isotactic structure, followed by quenching, or, after these steps, additionally subjecting the above molded article to a heat treatment at a temperature of less than its melting point. A method for preparing the above molded article is also disclosed here.
Inventors
- 👤 Tadashi Asanuma
- 👤 Tateyo Sasaki
- 👤 Mitsuru Ito
- 👤 Tetsunosuke Shiomura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 22:05
CPC Classifications
C; C08; C08J; C08J5/00; B; B29; B29C; B29C67/00; B29C67/24; B29K; B29K2023/00; B29K2023/10; B29K2023/12; B29K2995/00; B29K2995/0018; B29K2995/0026; C08F; C08F110/00; C08F110/04; C08F110/06; Y; Y10; Y10T; Y10T428/00; Y10T428/26
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
99 words
A molded article of a syndiotactic polypropylene having excellent transparency in which the melting point attributed to the polypropylene having a syndiotactic structure measured at a heating rate of 10°C/minute by differential scanning thermal analysis is represented by a substantially single peak, said molded article being prepared by heating, melting and then hot-molding a homopolymer of propylene or a copolymer of propylene and a small amount of another olefin, which have a substantially syndiotactic structure, or a mixture of said homopolymer or said copolymer and a small amount of a polypropylene having a substantially isotactic structure, followed by quenching.
Claim 2
Dependent Claim
99 words
A molded article of a syndiotactic polypropylene having excellent transparency in which the melting point attributed to the polypropylene having a syndiotactic structure measured at a heating rate of 10°C/minute by differential scanning thermal analysis is represented by a substantially single peak, said molded article being prepared by heating, melting and then hot-molding a homopolymer of propylene or a copolymer of propylene and a small amount of another olefin, which have a substantially syndiotactic structure, or a mixture of said homopolymer or said copolymer and a small amount of a polypropylene having a substantially isotactic structure, followed by quenching.
Claim 3
Independent Claim
78 words
A method for preparing a molded article of a syndiotactic polypropylene having excellent transparency which comprises the steps of heating, melting and then hot-molding a homopolymer of propylene or a copolymer of propylene and a small amount of another olefin, which have a substantially syndiotactic structure, or a mixture of said homopolymer or said copolymer and a small amount of a polypropylene having a substantially isotactic structure; and then quenching the resulting molded article at 100°C/minutes or more.
Claim 4
Independent Claim
78 words
A method for preparing a molded article of a syndiotactic polypropylene having excellent transparency which comprises the steps of heating, melting and then hot-molding a homopolymer of propylene or a copolymer of propylene and a small amount of another olefin, which have a substantially syndiotactic structure, or a mixture of said homopolymer or said copolymer and a small amount of a polypropylene having a substantially isotactic structure; and then quenching the resulting molded article at 100°C/minutes or more.
Claim 5
Dependent Claim
116 words
A molded article of a syndiotactic polypropylene having excellent transparency prepared by heating, melting and then hot-molding a homopolymer of propylene or a copolymer of propylene and a small amount of another olefin, which have a substantially syndiotactic structure, or a mixture of said homopolymer or said copolymer and a small amount of a polypropylene having a substantially isotactic structure; quenching to obtain a molded article in which the melting point attributed to the polypropylene having a syndiotactic structure measured at a heating rate of 10°C/minute by differential scanning thermal analysis is represented by a substantially single peak; and then subjecting said molded article to heat treatment at a temperature of less than its melting point.
Claim 6
Dependent Claim
116 words
A molded article of a syndiotactic polypropylene having excellent transparency prepared by heating, melting and then hot-molding a homopolymer of propylene or a copolymer of propylene and a small amount of another olefin, which have a substantially syndiotactic structure, or a mixture of said homopolymer or said copolymer and a small amount of a polypropylene having a substantially isotactic structure; quenching to obtain a molded article in which the melting point attributed to the polypropylene having a syndiotactic structure measured at a heating rate of 10°C/minute by differential scanning thermal analysis is represented by a substantially single peak; and then subjecting said molded article to heat treatment at a temperature of less than its melting point.
Claim 7
Independent Claim
96 words
A method for preparing a molded article of a syndiotactic polypropylene having excellent transparency which comprises the steps of heating, melting and then hot-molding a homopolymer of propylene or a copolymer of propylene and a small amount of another olef in, which have a substantially syndiotactic structure, or a mixture of said homopolymer or said copolymer and a small amount of a polypropylene having a substantially isotactic structure; quenching the resulting molded article at 100°C/minutes or more; and then subjecting said molded article to a heat treatment at a temperature of less than its melting point.
Claim 8
Independent Claim
96 words
A method for preparing a molded article of a syndiotactic polypropylene having excellent transparency which comprises the steps of heating, melting and then hot-molding a homopolymer of propylene or a copolymer of propylene and a small amount of another olef in, which have a substantially syndiotactic structure, or a mixture of said homopolymer or said copolymer and a small amount of a polypropylene having a substantially isotactic structure; quenching the resulting molded article at 100°C/minutes or more; and then subjecting said molded article to a heat treatment at a temperature of less than its melting point.
Claim 9
Dependent Claim
96 words
A molded article of a syndiotactic polypropylene having excellent transparency in which a melting point measured at a heating rate of 10°C/minute by differential scanning thermal analysis is represented by a substantially single peak, said molded article being prepared by heating, melting and then hot-molding a homopolymer of propylene or a copolymer of propylene and a small amount of another olefin, which have a substantially syndiotactic structure, the ratio between the weight average molecular weight and the number average molecular weight of said polymer being from 1.5 to 3.5, and then quenching the resulting molded article.
Claim 10
Dependent Claim
96 words
A molded article of a syndiotactic polypropylene having excellent transparency in which a melting point measured at a heating rate of 10°C/minute by differential scanning thermal analysis is represented by a substantially single peak, said molded article being prepared by heating, melting and then hot-molding a homopolymer of propylene or a copolymer of propylene and a small amount of another olefin, which have a substantially syndiotactic structure, the ratio between the weight average molecular weight and the number average molecular weight of said polymer being from 1.5 to 3.5, and then quenching the resulting molded article.
Claim 11
Independent Claim
80 words
A method for preparing a molded article of a syndiotactic polypropylene having excellent transparency which comprises the steps of heating, melting and then hot-molding a homopolymer of propylene or a copolymer of propylene and a small amount of another olef in, which have a substantially syndiotactic structure, the ratio between the weight average molecular weight and the number average molecular weight of said polymer being from 1.5 to 3.5; and then quenching the resulting molded article at 100°C/minute or more.
Claim 12
Independent Claim
80 words
A method for preparing a molded article of a syndiotactic polypropylene having excellent transparency which comprises the steps of heating, melting and then hot-molding a homopolymer of propylene or a copolymer of propylene and a small amount of another olef in, which have a substantially syndiotactic structure, the ratio between the weight average molecular weight and the number average molecular weight of said polymer being from 1.5 to 3.5; and then quenching the resulting molded article at 100°C/minute or more.
Claim 13
Dependent Claim
114 words
A molded article of a syndiotactic polypropylene having excellent transparency which is prepared by heating, melting and then hot-molding a homopolymer of propylene or a copolymer of said propylene and a small amount of another olef in, which have a substantially syndiotactic structure, the ratio between the weight average molecular weight and the number average molecular weight of said polymer being from 1.5 to 3.5; quenching to obtain a molded article in which a melting point measured at a heating rate of 10°C/minute by differential scanning thermal analysis is represented by a substantially single peak; and then subjecting said molded article to a heat treatment at a temperature of less than its melting point.
Claim 14
Dependent Claim
114 words
A molded article of a syndiotactic polypropylene having excellent transparency which is prepared by heating, melting and then hot-molding a homopolymer of propylene or a copolymer of said propylene and a small amount of another olef in, which have a substantially syndiotactic structure, the ratio between the weight average molecular weight and the number average molecular weight of said polymer being from 1.5 to 3.5; quenching to obtain a molded article in which a melting point measured at a heating rate of 10°C/minute by differential scanning thermal analysis is represented by a substantially single peak; and then subjecting said molded article to a heat treatment at a temperature of less than its melting point.
Claim 15
Independent Claim
96 words
A method for preparing a molded article of a syndiotactic polypropylene having excellent transparency which comprises the steps of heating, melting and then hot-molding a homopolymer of propylene or a copolymer of propylene and a small amount of another olefin, which have a substantially syndiotactic structure, the ratio between the weight average molecular weight and the number average molecular weight of said polymer being from 1.5 to 3.5; quenching the resulting molded article at 100°C/minute or more; and then subjecting said molded article to a heat treatment at a temperature of less than its melting point.
Claim 16
Independent Claim
96 words
A method for preparing a molded article of a syndiotactic polypropylene having excellent transparency which comprises the steps of heating, melting and then hot-molding a homopolymer of propylene or a copolymer of propylene and a small amount of another olefin, which have a substantially syndiotactic structure, the ratio between the weight average molecular weight and the number average molecular weight of said polymer being from 1.5 to 3.5; quenching the resulting molded article at 100°C/minute or more; and then subjecting said molded article to a heat treatment at a temperature of less than its melting point.
References Cited (Backward Citations)
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