US4898897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing polyester resin composition
Assignee: KANEBO Ltd A CORP OF JAPAN
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Filing: 1988-04-21
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Granted: 1990-02-06
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Expires: 2008-04-21
Abstract
Abstract A process for producing a polyester resin composition containing at least 10 wt % of a white inorganic pigment dispersed in a polyester resin, which comprises kneading the polyester resin with the white inorganic pigment and thereafter subjecting the blend to a polycondensation reaction at a temperature ranging from the melting point of the polyester up to 300° C. and at a reduced pressure of not higher than 5 Torr, is disclosed.
Inventors
- 👤 Kazuto Kiyohara
- 👤 Toshiaki Yamazaki
- 👤 Ichiya Harada
- 👤 Takanori Nakadate
- 👤 Kentaro Noguchi
- 👤 Michiteru Nakano
- 👤 Shigeru Sakae
- 👤 Kazuhiro Okuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:45
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/88; B; B29; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/46; B29B7/48; B29B7/482; B29B7/483; B29B7/74; B29B7/7461; B29B7/7476; B29B7/7485; B29C; B29C48/00; B29C48/001; B29C48/0018; B29C48/25; B29C48/36; B29C48/50; B29C48/505; B29C48/57; B29C48/76; B29C48/765; B29C48/766; B29C48/767; B29C48/88; B29C48/911; B29C48/9135; B29C48/914; C08K; C08K3/00; C08K3/01; C08K3/013; B29B7/80; B29B7/82; B29B7/826; B29B9/00; B29B9/02; B29B9/06; B29C48/03; B29C48/07; B29C48/08; B29C48/375; B29C48/387; B29C48/395; B29C48/40; B29C48/405; B29C48/695; B29C48/70
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
70 words
A process for producing a polyester resin composition containing at least 10 wt % of a white inorganic pigment dispersed in a polyester resin, which comprises kneading the polyester resin with the white inorganic pigment and thereafter subjecting the blend to a polycondensation reaction at a temperature ranging from the melting point of the polyester up to 300° C. and at a reduced pressure of not higher than 5 Torr.
Claim 2
Dependent Claim
70 words
A process for producing a polyester resin composition containing at least 10 wt % of a white inorganic pigment dispersed in a polyester resin, which comprises kneading the polyester resin with the white inorganic pigment and thereafter subjecting the blend to a polycondensation reaction at a temperature ranging from the melting point of the polyester up to 300° C. and at a reduced pressure of not higher than 5 Torr.
Claim 3
Dependent Claim
26 words
A process according to claim 1 wherein said polyester resin is selected from the group consisting of polyethylene terephthalate, polyethylene 2,6-dinaphthalate, polypropylene terephthalate and polybutylene terephthalate.
Claim 4
Dependent Claim
13 words
A process according to claim 2 wherein said polyester resin is polyethylene terephthate.
Claim 5
Dependent Claim
36 words
A process according to claim 1 wherein said white inorganic pigment is at least one member selected from the group consisting of talc, lithopone, titanium dioxide, zinc oxide, barium sulfate, calcium carbonate, alumina, silica and kaolin.
Claim 6
Dependent Claim
14 words
A process according to claim 4 wherein said white inorganic pigment is titanium dioxide.
Claim 7
Dependent Claim
21 words
A process according to claim 1 wherein said polycondensation reaction is performed at a temperature in the range of 275°-290° C.
Claim 8
Dependent Claim
20 words
A process according to claim 1 wherein said polycondensation reaction is performed at a pressure of 1 Torr and below.
Claim 9
Dependent Claim
25 words
A process according to claim 1 wherein said white inorganic pigment is present in an amount of 10-30 wt % of said polyester resin composition.
Claim 10
Dependent Claim
106 words
A process for producing a polyester resin composition containing at least 10 wt % of a white inorganic pigment dispersed in a polyester resin, which comprises kneading and dispersing said white inorganic pigment in at least part of a molten polyester resin withdrawn from a continuous polycondensation apparatus, mixing the blend with a polyester resin also withdrawn from a continuous polycondensation apparatus but which has not been kneaded with the white inorganic pigment, and subjecting the resin mixture to a polycondensation reaction at a temperature ranging from the melting point of the polyester up to 300° C. and at a pressure not higher than 5 Torr.
Claim 11
Dependent Claim
106 words
A process for producing a polyester resin composition containing at least 10 wt % of a white inorganic pigment dispersed in a polyester resin, which comprises kneading and dispersing said white inorganic pigment in at least part of a molten polyester resin withdrawn from a continuous polycondensation apparatus, mixing the blend with a polyester resin also withdrawn from a continuous polycondensation apparatus but which has not been kneaded with the white inorganic pigment, and subjecting the resin mixture to a polycondensation reaction at a temperature ranging from the melting point of the polyester up to 300° C. and at a pressure not higher than 5 Torr.
Claim 12
Dependent Claim
63 words
A process according to claim 9 wherein at least part of the molten polyester resin withdrawn from the continuous polycondensation apparatus is kneaded with the white inorganic pigment at a temperature that satisfies the following condition: Tm+5° C.≦T≦Tm+25° C. where Tm is the melting point (°C.) of the polyester resin and T is the temperature (°C.) at which the polyester resin is heated.
Claim 13
Dependent Claim
71 words
A process according to claim 9 wherein said polyester resin that has been withdrawn from the continuous polycondensation apparatus but which has not been kneaded with the white inorganic pigment is mixed with the pigment-loaded polyester resin at a temperature that satisfies the following condition: Tm+5° C.≦T≦Tm+25° C. where Tm is the melting point (°C.) of the polyester resin, and T is the temperature (°C.) at which the polyester is heated.
Claim 14
Dependent Claim
28 words
A process according to claim 9 wherein said white inorganic pigment has a concentration of 20-60 wt % when it is kneaded and dispersed in the polyester resin.
Claim 15
Dependent Claim
14 words
A process according to claim 9 wherein said white inorganic pigment is titanium dioxide.
Claim 16
Dependent Claim
25 words
A process according to claim 9 wherein said white inorganic pigment is present in an amount of 10-30 wt % of said polyester resin composition.
Claim 17
Dependent Claim
13 words
A process according to claim 9 wherein said polyester resin is polyethylene terephthalate.
Claim 18
Dependent Claim
21 words
A process according to claim 9 wherein said polycondensation reaction is carried at a temperature in the range of 275°-290° C.
Claim 19
Dependent Claim
22 words
A process according to claim 9 wherein said polycondensation reaction is carried out at a pressure of no higher than 1 Torr.
References Cited (Backward Citations)
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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) | 1993-02-05 | 1993-08-07 | 1994-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-05 | 1997-08-07 | 1998-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-05 | 2001-08-07 | 2002-02-06 | $7700.00 | Window Closed / Lapsed |