Patent US4727108A successfully refreshed from Google Patents.
US4727108A
Expired / Lapsed
US
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Polyester compositions and process of preparing polyester films from them
Assignee: Mitsubishi Chemical Corp
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Filing: 1986-10-21
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Granted: 1988-02-23
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Expires: 2006-10-21
Abstract
Abstract Disclosed herein is a polyester composition comprising 0.001-5% by weight of particles which have an average particle size of 0.05-5 micrometers, are mainly composed of calcium carbonate and contain 0.001-5% by weight of at least one compound selected from the group consisting of magnesium compounds, strontium compounds and barium compounds. Also disclosed herein is a process for preparing a polyester film by the electrostatic cooling method, which process is characterized by using the polyester composition of the present invention.
Inventors
- 👤 Takashi Kagiyama
- 👤 Kazuo Endo
- 👤 Chikakazu Kawaguchi
- 👤 Yosio Meguro
- 👤 Kazuhiro Kunugihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:51
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02; C08K; C08K3/00; C08K3/18; C08K3/24; C08K3/26; C08K3/10; C08K3/105
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
57 words
A polyester composition comprising a polymeric saturated polyester and 0.001-5% by weight of particles which have an average particle size of 0.05-5 micrometers, said particles being mainly composed of calcium carbonate, and containing 0.001-5% by weight of at least one compound selected from the group consisting of magnesium (Mg) compounds, strontium (Sr) compounds and barium (Ba) compounds.
Claim 2
Dependent Claim
57 words
A polyester composition comprising a polymeric saturated polyester and 0.001-5% by weight of particles which have an average particle size of 0.05-5 micrometers, said particles being mainly composed of calcium carbonate, and containing 0.001-5% by weight of at least one compound selected from the group consisting of magnesium (Mg) compounds, strontium (Sr) compounds and barium (Ba) compounds.
Claim 3
Dependent Claim
20 words
The composition of claim 1, wherein said group consists of salts, halides, hydroxides and oxides of Mg, Sr and Ba.
Claim 4
Dependent Claim
36 words
The composition of claim 1, wherein the particles mainly composed of calcium carbinate contain 0.01-5% by weight of at least one of the Mg, Sr and Ba compounds based on the weight of the calcium carbonate.
Claim 5
Dependent Claim
17 words
The composition of claim 1, comprising 0.01-5% by weight of the particles mainly composed of calcium carbonate.
Claim 6
Dependent Claim
46 words
The composition of claim 1, wherein said particles mainly composed of calcium carbonate are obtained by reacting an aqueous suspension of calcium hydroxide with carbonic acid gas in the presence of at least one compound selected from the group consisting of Mg, Sr and Ba compounds.
Claim 7
Dependent Claim
43 words
The composition of claim 1, further comprising 0.001-10% by weight, based on the weight of calcium carbonate, of an additional compound having a calcium binding ability at 90° C. of 100 or more, in addition to the particles mainly composed of calcium carbonate.
Claim 8
Dependent Claim
21 words
The composition of claim 6, wherein the additional compound has a calcium binding ability at 90° C. of 150 or more.
Claim 9
Dependent Claim
75 words
In a process for preparing a polyester film by the electrostatic cooling method, the improvement comprising utilizing, as a starting material, a polyester composition comprising a polymeric saturated polyester and 0.001-5% by weight of particles which have an average particle size of 0.05-5 micrometers, said particles being mainly composed of calcium carbonate, and containing 0.001-5% by weight of at least one compound selected from the group consisting of magnesium compounds, strontium compounds and barium compounds.
Claim 10
Dependent Claim
75 words
In a process for preparing a polyester film by the electrostatic cooling method, the improvement comprising utilizing, as a starting material, a polyester composition comprising a polymeric saturated polyester and 0.001-5% by weight of particles which have an average particle size of 0.05-5 micrometers, said particles being mainly composed of calcium carbonate, and containing 0.001-5% by weight of at least one compound selected from the group consisting of magnesium compounds, strontium compounds and barium compounds.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-22 | 1991-08-24 | 1992-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-22 | 1995-08-24 | 1996-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-22 | 1999-08-24 | 2000-02-23 | $7700.00 | Window Closed / Lapsed |