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US4668753A
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Film-forming propylene copolymer, film thereof and process for production of the film
Assignee: Mitsui Chemicals Inc
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Filing: 1986-08-25
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Granted: 1987-05-26
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Expires: 2006-08-25
Abstract
Abstract A film-forming propylene copolymer composed of a major amount of propylene and a minor amount of ethylene, characterized by having (A) an ethylene content (Ec) of from 0.1 mole % to 2.0 mole % based on the total amount of propylene and ethylene, and (B) an isotactic value (Iso) in the range represented by the following formula (1) or (2), (i) when 0.1</=Ec</=0.3, Iso>/=-5_E+96.3 (%) (1), and (ii) when 0.3<Ec</=2.0, Iso>/=-0.67_E+95.0 (%) (2) wherein _E represents the numerical value of Ec (mole %); a film of the copolymer; and a process for producing the film.
Inventors
- 👤 Norio Kashiwa
- 👤 Mamoru Kioka
- 👤 Masaki Kohyama
- 👤 Masanobu Ishiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:11
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08F; C08F210/00; C08F210/04; C08F210/06; C08F210/16; C08J2323/00; C08J2323/02; C08J2323/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
83 words
A film-forming propylene copolymer composed of a major amount of propylene and a minor amount of ethylene, characterized by having (A) an ethylene content (Ec) of from 0.1 mole % to 2.0 mole % based on the total amount of propylene and ethylene, and (B) an isotactic value (Iso) in the range represented by the following formula (1) or (2), (i) when 0.1≦Ec≦0.3, Iso≧-5Ec30 96.8(%) (1), and (ii) when 0.3<Ec≦2.0, Iso≧-0.67Ec30 95.5(%) (2) wherein Ec0 represents the numerical value of Ec (mole %).
Claim 2
Dependent Claim
83 words
A film-forming propylene copolymer composed of a major amount of propylene and a minor amount of ethylene, characterized by having (A) an ethylene content (Ec) of from 0.1 mole % to 2.0 mole % based on the total amount of propylene and ethylene, and (B) an isotactic value (Iso) in the range represented by the following formula (1) or (2), (i) when 0.1≦Ec≦0.3, Iso≧-5Ec30 96.8(%) (1), and (ii) when 0.3<Ec≦2.0, Iso≧-0.67Ec30 95.5(%) (2) wherein Ec0 represents the numerical value of Ec (mole %).
Claim 3
Dependent Claim
28 words
The copolymer of claim 1 which is further characterized by having (C) an intrinsic viscosity [η], determined in decalin at 135° C., of from 1.2 to 6.0 dl/g.
Claim 4
Dependent Claim
35 words
The copolymer of claim 1 which is in the form of a biaxially stretched film with a stretch ratio of at least 3.5 in the longitudinal direction and at least 7 in the transverse direction.
Claim 5
Dependent Claim
26 words
The copolymer of claim 1 wherein the ethylene content (Ec) is from 0.1 to 1.5 mole %, based on the total amount of propylene and ethylene.
Claim 6
Dependent Claim
26 words
The copolymer of claim 1 wherein the ethylene content (Ec) is from 0.3 to 1.5 mole %, based on the total amount of propylene and ethylene.
Claim 7
Dependent Claim
26 words
The copolymer of claim 2 wherein the ethylene content (Ec) is from 0.3 to 1.5 mole %, based on the total amount of propylene and ethylene.
Claim 8
Dependent Claim
15 words
The copolymer of claim 6 wherein the intrinsic viscosity is from 1.5 to 5.0 dl/g.
Claim 9
Dependent Claim
15 words
The copolymer of claim 2 wherein the intrinsic viscosity is from 1.5 to 5.0 dl/g.
Claim 10
Dependent Claim
28 words
The copolymer of claim 3 wherein the stretch ratio in the longitudinal direction is from 3.5 to 7 and in the transverse direction is from 7 to 12.
Claim 11
Dependent Claim
74 words
The copolymer of claim 3 wherein the biaxially stretched film has a haze in the range of from about 1.3 to about 1.5%, an impact strength in the range of from about 3200 to 3400 kg/cm/cm, a tensile Young's modulus in the machine direction of from 2.7 to 3.0×10 4 kg/cm 2 , and a tensile Young's modulus in the transverse direction in the range of from 5.9 to 6.3×10 4 kg/cm 2 .
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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) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |