US5026778A
Expired / Lapsed
US
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Polypropylene-based resin composition and process for preparation of sheets comprising the resin composition
Assignee: Idemitsu Kosan Co Ltd
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Filing: 1990-05-04
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Granted: 1991-06-25
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Expires: 2010-05-04
Abstract
Abstract A method for preparation of a polypropylene-based resin sheet, which method comprises; melting a resin composition comprising 60-98 % by weight of a polypropylene-based resin, 1-30 % by weight of a petroleum resin, and 1-20 % by weight of a low-crystalline or amorphous ethylene- alpha -olefin copolymer, at a temperature of not lower than 200 DEG C ; extruding the molten resin composition to form a sheet; and quenching the extruded sheet to a temperature of not higher than 60 DEG C .
Inventors
- 👤 Atsushi Fujii
- 👤 Kazuyuki Fukuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:37
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08L23/14; C08L23/142; C08L2205/00; C08L2205/03; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08L23/16; C08L57/00; C08L57/02
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
95 words
A polypropylene-based resin composition consisting essentially of 60-97% by weight of a polypropylene-based resin selected from the group consisting of (i) homopolypropylene, (ii) a crystalline random copolypropylene and (iii) a mixture of homopolypropylene and a crystalline random copolypropylene, 2-20% by weight of a petroleum resin, and 1-20% by weight of a low-crystalline or amorphous ethylene-α-olefin copolymer having a refractive index of from 1.480 to 1.505 at 25° C., and when said polypropylene-based resin is a crystalline random copolypropylene or a mixture of a homopolypropylene and a crystalline random copolypropylene, said ethylene-α-olefin is an amorphous copolymer.
Claim 2
Dependent Claim
95 words
A polypropylene-based resin composition consisting essentially of 60-97% by weight of a polypropylene-based resin selected from the group consisting of (i) homopolypropylene, (ii) a crystalline random copolypropylene and (iii) a mixture of homopolypropylene and a crystalline random copolypropylene, 2-20% by weight of a petroleum resin, and 1-20% by weight of a low-crystalline or amorphous ethylene-α-olefin copolymer having a refractive index of from 1.480 to 1.505 at 25° C., and when said polypropylene-based resin is a crystalline random copolypropylene or a mixture of a homopolypropylene and a crystalline random copolypropylene, said ethylene-α-olefin is an amorphous copolymer.
Claim 3
Dependent Claim
48 words
The polypropylene-based resin composition as claimed in claim 1, wherein the polypropylene-based resin is a homopolypropylene or a crystalline random copolypropylene obtained by copolymerizing propylene with ethylene or 1-butene, the random copolypropylene containing ethylene units or 1-butene units in an amount of not more than 15% by weight.
Claim 4
Dependent Claim
23 words
The polypropylene-based resin composition as claimed in claim 1, wherein the polypropylene-based resin has a melt index of 0.5 to 20 g/10 min.
Claim 5
Dependent Claim
18 words
The polypropylene-based resin composition as claimed in claim 1, wherein the petroleum resin is an alicyclic petroleum resin.
Claim 6
Dependent Claim
18 words
The polypropylene-based resin composition as claimed in claim 1, wherein the petroleum resin is a hydrogenated terpene resin.
Claim 7
Dependent Claim
37 words
The polypropylene-based resin composition as claimed in claim 1, wherein the petroleum resin has a molecular weight of 400 to 5000, a softening point of 50° to 160° C., and a hydrogenation-degree of not less than 80%.
Claim 8
Dependent Claim
37 words
The polypropylene-based resin composition as claimed in claim 1, wherein the ethylene-α-olefin copolymer is a copolymer obtained by copolymerizing ethylene with at least one α-olefin selected from the group consisting of propylene, 1-butene, 1-pentene, 3-methyl-1-butene, and 4-methyl-1-pentene.
Claim 9
Dependent Claim
17 words
The polypropylene-based resin composition as claimed in claim 1, wherein the ethylene-α-olefin copolymer is an ethylene-1-butene copolymer.
Claim 10
Dependent Claim
23 words
The polypropylene-based resin composition as claimed in claim 1, wherein the ethylene-α-olefin copolymer has a density of 0.85 to 0.91 g/cm 3 inclusive.
Claim 11
Dependent Claim
23 words
The polypropylene-based resin composition as claimed in claim 1, wherein the ethylene-α-olefin copolymer has a density of 0.86 to 0.90 g/cm 3 inclusive.
Claim 12
Dependent Claim
118 words
A polypropylene-based resin composition comprising (a) 100 parts by weight of a polypropylene-based resin composition consisting essentially of 60-97% by weight of a polypropylene-based resin selected from the group consisting of (i) homopolypropylene, (ii) a crystalline random copolypropylene and (iii) a mixture of homopolypropylene and a crystalline random copolypropylene, 2-20% by weight of a petroleum resin, and 1-20% by weight of a low-crystalline or amorphous ethylene-α-olefin copolymer having a refractive index of from 1.480 to 1.505 at 25° C. and (b) 0.05 to 0.5 parts by weight of a nucleating agent; and when said polypropylene-based resin is a crystalline random copolypropylene or a mixture of a homopolypropylene and a crystalline random copolypropylene, said ethylene-α-olefin is an amorphous copolymer.
Claim 13
Dependent Claim
118 words
A polypropylene-based resin composition comprising (a) 100 parts by weight of a polypropylene-based resin composition consisting essentially of 60-97% by weight of a polypropylene-based resin selected from the group consisting of (i) homopolypropylene, (ii) a crystalline random copolypropylene and (iii) a mixture of homopolypropylene and a crystalline random copolypropylene, 2-20% by weight of a petroleum resin, and 1-20% by weight of a low-crystalline or amorphous ethylene-α-olefin copolymer having a refractive index of from 1.480 to 1.505 at 25° C. and (b) 0.05 to 0.5 parts by weight of a nucleating agent; and when said polypropylene-based resin is a crystalline random copolypropylene or a mixture of a homopolypropylene and a crystalline random copolypropylene, said ethylene-α-olefin is an amorphous copolymer.
Claim 14
Dependent Claim
18 words
The polypropylene-based resin composition as claimed in claim 11, wherein the nucleating agent is a derivative of dibenzylidenesorbitol.
Claim 15
Independent Claim
137 words
A method for preparation of a polypropylene-based resin sheet, which method comprises; melting a resin composition comprising 60-97% by weight of a polypropylene-based resin selected from the group consisting of (i) homopolypropylene, (ii) a crystalline random copolypropylene and (iii) a mixture of homopolypropylene and a crystalline random copolypropylene, 2-20% by weight of a petroleum resin, and 1-20% by weight of a low-crystalline or amorphous ethylene-α-olefin copolymer having a refractive index of from 1.480 to 1.505 at 25° C., and when said polypropylene-based resin is a crystalline random copolypropylene or a mixture of a homopolypropylene and a crystalline random copolypropylene, said ethylene-α-olefin is an amorphous copolymer, at a temperature of not lower than 200° C.; extruding the molten resin composition to form a sheet; and quenching the extruded sheet to a temperature of not higher than 60° C.
Claim 16
Independent Claim
137 words
A method for preparation of a polypropylene-based resin sheet, which method comprises; melting a resin composition comprising 60-97% by weight of a polypropylene-based resin selected from the group consisting of (i) homopolypropylene, (ii) a crystalline random copolypropylene and (iii) a mixture of homopolypropylene and a crystalline random copolypropylene, 2-20% by weight of a petroleum resin, and 1-20% by weight of a low-crystalline or amorphous ethylene-α-olefin copolymer having a refractive index of from 1.480 to 1.505 at 25° C., and when said polypropylene-based resin is a crystalline random copolypropylene or a mixture of a homopolypropylene and a crystalline random copolypropylene, said ethylene-α-olefin is an amorphous copolymer, at a temperature of not lower than 200° C.; extruding the molten resin composition to form a sheet; and quenching the extruded sheet to a temperature of not higher than 60° C.
Claim 17
Independent Claim
151 words
A method for preparation of a polypropylene-based resin sheet, which method comprises; melting a resin composition comprising 60-97% by weight of a polypropylene-based resin selected from the group consisting of (i) homopolypropylene, (ii) a crystalline random copolypropylene and (iii) a mixture of homopolypropylene and a crystalline random copolypropylene, 2-20% by weight of a petroleum resin, and 1-20% by weight of a low-crystalline or amorphous ethylene-α-olefin copolymer having a refractive index of from 1.480 to 1.505 at 25° C., and when said polypropylene-based resin is a crystalline random copolypropylene or a mixture of a homopolypropylene and a crystalline random copolypropylene, said ethylene-α-olefin is an amorphous copolymer, at a temperature of not lower than 200° C.; extruding the molten resin composition to form a sheet; quenching the extruded sheet to a temperature of not higher than 60° C.; and then heating the resulting sheet at a temperature of from 80° to 160° C.
Claim 18
Independent Claim
151 words
A method for preparation of a polypropylene-based resin sheet, which method comprises; melting a resin composition comprising 60-97% by weight of a polypropylene-based resin selected from the group consisting of (i) homopolypropylene, (ii) a crystalline random copolypropylene and (iii) a mixture of homopolypropylene and a crystalline random copolypropylene, 2-20% by weight of a petroleum resin, and 1-20% by weight of a low-crystalline or amorphous ethylene-α-olefin copolymer having a refractive index of from 1.480 to 1.505 at 25° C., and when said polypropylene-based resin is a crystalline random copolypropylene or a mixture of a homopolypropylene and a crystalline random copolypropylene, said ethylene-α-olefin is an amorphous copolymer, at a temperature of not lower than 200° C.; extruding the molten resin composition to form a sheet; quenching the extruded sheet to a temperature of not higher than 60° C.; and then heating the resulting sheet at a temperature of from 80° to 160° C.
Claim 19
Independent Claim
164 words
A method for preparation of a polypropylene-based resin sheet, which method comprises; melting a resin composition comprising 60-97% by weight of a polypropylene-based resin selected from the group consisting of (i) homopolypropylene, (ii) a crystalline random copolypropylene and (iii) a mixture of homopolypropylene and a crystalline random copolypropylene, 2-20% by weight of a petroleum resin, and 1-20% by weight of a low-crystalline or amorphous ethylene-α-olefin copolymer having a refractive index of from 1.480 to 1.505 at 25° C., and when said polypropylene-based resin is a crystalline random copolypropylene or a mixture of a homopolypropylene and a crystalline random copolypropylene, said ethylene-α-olefin is an amorphous copolymer, at a temperature of not lower than 200° C.; extruding the molten resin composition to form a sheet; quenching the extruded sheet to a temperature of not higher than 60° C.; and then drawing the resulting sheet under heating at a temperature of from 80° to 160° C. to reduce the width of the sheet by 5 to 20%.
Claim 20
Independent Claim
164 words
A method for preparation of a polypropylene-based resin sheet, which method comprises; melting a resin composition comprising 60-97% by weight of a polypropylene-based resin selected from the group consisting of (i) homopolypropylene, (ii) a crystalline random copolypropylene and (iii) a mixture of homopolypropylene and a crystalline random copolypropylene, 2-20% by weight of a petroleum resin, and 1-20% by weight of a low-crystalline or amorphous ethylene-α-olefin copolymer having a refractive index of from 1.480 to 1.505 at 25° C., and when said polypropylene-based resin is a crystalline random copolypropylene or a mixture of a homopolypropylene and a crystalline random copolypropylene, said ethylene-α-olefin is an amorphous copolymer, at a temperature of not lower than 200° C.; extruding the molten resin composition to form a sheet; quenching the extruded sheet to a temperature of not higher than 60° C.; and then drawing the resulting sheet under heating at a temperature of from 80° to 160° C. to reduce the width of the sheet by 5 to 20%.
Claim 21
Dependent Claim
44 words
The method for preparation of a polypropylene-based resin sheet as claimed in claim 13, 14 or 15, wherein the quenching of the extruded sheet is performed by bringing the extruded sheet into contact with water of a temperature of not higher than 20° C.
Claim 22
Dependent Claim
37 words
The method for preparation of a polypropylene-based resin sheet as claimed in claim 13, 14 or 15, wherein the quenching of the extruded sheet is performed in a slit with cooling water flowing down through the slit.
Claim 23
Dependent Claim
25 words
The polypropylene-based resin composition as claimed in claim 1, wherein said ethylene-α-olefin copolymer has a refractive index of from 1.485 to 1.500 at 25° C.
Claim 24
Dependent Claim
25 words
The polypropylene-based resin composition as claimed in claim 11, wherein said ethylene-α-olefin copolymer has a refractive index of from 1.485 to 1.500 at 25° C.
Claim 25
Dependent Claim
16 words
The polypropylene-based resin composition as claimed in claim 1, wherein said polypropylene-based resin is a homopolypropylene.
Claim 26
Dependent Claim
17 words
The polypropylene-based resin composition as claimed in claim 1, wherein said polypropylene-based resin is a crystalline homopolypropylene.
Claim 27
Dependent Claim
16 words
The polypropylene-based resin composition as claimed in claim 11, wherein said polypropylene-based resin is a homopolypropylene.
Claim 28
Dependent Claim
17 words
The polypropylene-based resin composition as claimed in claim 11, wherein said polypropylene-based resin is a crystalline homopolypropylene.
References Cited (Backward Citations)
GB1020012A
Cited
US3278646A
Cited
US3361849A
Cited
US3663488A
Cited
JPS5272744A
Cited
JPS5315894A
Cited
JPS53117069A
Cited
JPS5527203A
Cited
JPS58157839A
Cited
JPS60163949A
Cited
US4629639A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-06-24 | 1994-12-24 | 1995-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-24 | 1998-12-24 | 1999-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-24 | 2002-12-24 | 2003-06-25 | $7700.00 | Window Closed / Lapsed |