Patent US4948841A successfully refreshed from Google Patents.
US4948841A
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US
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Propylene polymer composition
Assignee: Prime Polymer Co Ltd
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Filing: 1988-10-28
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Granted: 1990-08-14
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Expires: 2008-10-28
Abstract
Abstract The present invention relates to a propylene polymer composition comprising: 65 to 95% by weight of a propylene homopolymer having (a) an intrinsic viscosity ([η 1 ]) of 0.5 to 3.5 dl/g, (b) a xylene soluble content at ordinary temperature (Xs) of not more than 3% by weight, and a difference (Δ[η 1 ]) between ([η 1 ]) of xylene insoluble portion at the ordinary temperature and ([η 1 ]) of xylene soluble portion at the ordinary temperature of not more than 0.5 dl/g, (c) an isotactic pentad fraction (IP) falling within the range represented by the following equation: IP≧-0.624[η.sub.1 ]+97.5, and (d) a crystallization temperature (Tc) falling within the range represented by the following equation: Tc≧-2.33[η.sub.1 ]+116.0; and 5 to 35% by weight of a propylene-ethylene random copolymer having (e) an intrinsic viscosity ([η 2 ]) of less than 2.8 dl/g and (f) an ethylene content of 10 to 35% by weight. Moldings obtained from the composition of the present invention are good in luster and high in both impact resistance and stiffness, and can find various applications as moldings well balanced in physical properties.
Inventors
- 👤 Toshikazu Kasahara
- 👤 Hideo Funabashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:29
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08L23/16
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
153 words
A propylene polymer composition comprising: 65 to 95% by weight of a propylene homopolymer having (a) an intrinsic viscosity ([η 1 ]) of 0.5 to 3.5 dl/g, (b) a xylene soluble content at ordinary temperature (Xs) of not more than 3% by weight, and a difference (Δ[η 1 ]) between an intrinsic viscosity ([η 1 ]) of xylene insoluble portion at the ordinary temperature and an intrinsic viscosity ([η 1 ]) of xylene soluble portion at the ordinary temperature of not more than 0.5 dl/g, (c) an isotactic pentad fraction (IP) falling within the range represented by the following equation: IP ≧-0.624[η.sub.1 ]+97.5, and (d) a crystallization temperature (Tc) falling within the range represented by the following equation: Tc≧-2.33[η.sub.1 ]+116.0; and 5 to 35% by weight of a propylene-ethylene random copolymer having (e) an intrinsic viscosity ([02]) of less than 2.8 dl/g and (f) an ethylene content of 10 to 35% by weight.
Claim 2
Dependent Claim
153 words
A propylene polymer composition comprising: 65 to 95% by weight of a propylene homopolymer having (a) an intrinsic viscosity ([η 1 ]) of 0.5 to 3.5 dl/g, (b) a xylene soluble content at ordinary temperature (Xs) of not more than 3% by weight, and a difference (Δ[η 1 ]) between an intrinsic viscosity ([η 1 ]) of xylene insoluble portion at the ordinary temperature and an intrinsic viscosity ([η 1 ]) of xylene soluble portion at the ordinary temperature of not more than 0.5 dl/g, (c) an isotactic pentad fraction (IP) falling within the range represented by the following equation: IP ≧-0.624[η.sub.1 ]+97.5, and (d) a crystallization temperature (Tc) falling within the range represented by the following equation: Tc≧-2.33[η.sub.1 ]+116.0; and 5 to 35% by weight of a propylene-ethylene random copolymer having (e) an intrinsic viscosity ([02]) of less than 2.8 dl/g and (f) an ethylene content of 10 to 35% by weight.
Claim 3
Dependent Claim
23 words
The composition as claimed in claim 1, wherein the intrinsic viscosity [η 1 ] of the propylene homopolymer is 1 to 3 dl/g.
Claim 4
Dependent Claim
27 words
The composition as claimed in claim 1, wherein the xylene soluble content at the ordinary temperature (Xs) of the propylene homopolymer is 2 to 0.1% by weight.
Claim 5
Dependent Claim
48 words
The composition as claimed in claim 1, wherein the difference (Δ[η 1 ]) between the intrinsic viscosity ([η 1 ]) of xylene insoluble portion at the ordinary temperature and the intrinsic viscosity ([η 1 ]) of xylene soluble portion at the ordinary temperature is 0.4 to 0.1 dl/g.
Claim 6
Dependent Claim
25 words
The composition as claimed in claim 1, wherein the isotactic pentad fraction (IP) is in the range represented by the following equation: IP ≧-0.624[η.sub.1 ]+98.0.
Claim 7
Dependent Claim
24 words
The composition as claimed in claim 1, wherein the crystallization temperature (Tc) is in the range represented by the following equation: Tc ≧-2.33[η.sub.1 ]+117.0.
Claim 8
Dependent Claim
24 words
The composition as claimed in claim 1, wherein the intrinsic viscosity ([η 2 ]) of the propylene-ethylene random copolymer is 1 to 2.6 dl/g.
Claim 9
Dependent Claim
21 words
The composition as claimed in claim 1, wherein the ethylene content of the propylene-ethylene copolymer is 12 to 28% by weight.
Claim 10
Dependent Claim
27 words
The composition as claimed in claim 2, wherein the xylene soluble content at the ordinary temperature (Xs) of the propylene homopolymer is 2 to 0.1% by weight.
Claim 11
Dependent Claim
39 words
The composition as claimed in claim 9, wherein the difference between the intrinsic viscosity of the xylene insoluble portion at ordinary temperatures and the intrinsic viscosity of xylene soluble portion at the ordinary temperature is 0.4 to 0.1 dl/g.
Claim 12
Dependent Claim
24 words
The composition as claimed in claim 10, wherein the isotactic pentad fraction (IP) is in the range represented by the following equation: IP≧-0.624[η.sub.1 ]+98.0.
Claim 13
Dependent Claim
23 words
The composition as claimed in claim 11, wherein the crystallization temperature (Tc) is in the range represented by the following equation: Tc≧-2.33[η.sub.1 ]+117.0.
Claim 14
Dependent Claim
21 words
The composition as claimed in claim 12, wherein the intrinsic viscosity of the propylene-ethylene random copolymer is 1 to 2.6 dl/g.
Claim 15
Dependent Claim
21 words
The composition as claimed in claim 13, wherein the ethylene content of the propylene-ethylene copolymer is 12% to 28% by weight.
Claim 16
Dependent Claim
53 words
The composition as claimed in claim 1, wherein the difference between the intrinsic viscosity of xylene insoluble portion at the ordinary temperatures and the intrinsic viscosity of the xylene soluble portion at ordinary temperatures is 0.4 to 0.1 dl/g and the intrinsic viscosity of the propylene-ethylene random copolymer is 1 to 2.6 dl/g.
Claim 17
Dependent Claim
41 words
The composition as claimed in claim 15, wherein the xylene soluble content at the ordinary temperatures (Xs) of the propylene homopolymer is 2 to 0.1% by weight and the ethylene content of the propylene-ethylene copolymer is 12% to 28% by weight.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-13 | 1994-02-12 | 1994-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-13 | 1998-02-12 | 1998-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-13 | 2002-02-12 | 2002-08-14 | $7700.00 | Window Closed / Lapsed |