WO1993008233A1 - Polyester resin composition - Google Patents
Polyester resin composition Download PDFInfo
- Publication number
- WO1993008233A1 WO1993008233A1 PCT/US1992/008715 US9208715W WO9308233A1 WO 1993008233 A1 WO1993008233 A1 WO 1993008233A1 US 9208715 W US9208715 W US 9208715W WO 9308233 A1 WO9308233 A1 WO 9308233A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- resin composition
- polyester resin
- composition
- polyethyleneterephthalate
- under
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
Definitions
- the present invention relates to a polyester resin composition excellent in its resistance to moisture absorption, stability under a molten state, heat resistance, and mechanical properties, etc., and having a low specific gravity. More specifically, the present invention relates to a polyester resin composition containing polyethyleneterephthalate as a main component.
- a polyester resin composition containing polyethyleneterephthalate as a main component is known in the art as a resin composition exhibiting excellent mechanical and electrical properties and having a high resistance to chemicals.
- the conventional polyester resin composition containing polyethyleneterephthalate as a main component can be defective in that the composition may have low stability in a molten state and it may fail to exhibit a sufficient resistance to moisture absorption.
- the stability under a molten state noted above relates to a melt viscosity of the composition measured by a capirograph. If the stability under a molten state is low, so- called "fins" tend to be formed in the molding step of the resin composition, with the result that the outer appearance of the molded article is impaired.
- the resultant molded articles can be non-uniform in size and weight.
- the resistance to moisture absorption noted above relates to the following two conditions: (1) a mechanical strength of the article molded from the resin composition and (2) a melt viscosity of the pellets used for the molding.
- a composition has a high resistance to moisture absorption
- a molded article prepared by using pellets having a high water content e.g. 0.5%
- the composition has a high melt viscosity even in the case of using pellets having a high water content. Since it is difficult to mold polyethyleneterephthalate under the condition of moisture absorption, it is important to improve the resistance to moisture absorption in a polyester resin composition containing polyethyleneterephthalate as a main component.
- An object of the present invention is therefore to provide a polyester resin composition containing polyethyleneterephthalate as a main component, said composition exhibiting excellent mechanical properties, achieving marked improvements in both resistance to moisture absorption and stability under a molten state, and permitting a molding treatment under a low temperature.
- a polyester resin composition consisting essentially of a polyethyleneterephthalate and a polyolefin, with the ratio of the polyethyleneterephthalate to the polyolefin ranging between 95 : 5 and 80 : 20.
- the composition according to the present invention exhibits excellent stability under a molten state and resistance to moisture absorption, while maintaining excellent mechanical properties that are inherent in a resin containing polyethyleneterephthalate as a main component.
- polyethyleneterephthalate used in the present invention it is desirable for the polyethyleneterephthalate used in the present invention to have an intrinsic viscosity falling within a range of between about 0.4 and about 1.2.
- the polyolefin used in the present invention includes, for example, polyethylene, polypropylene and other olefin homopolymers; polyolefins modified with giycidyl methacrylate; and copolymers including graft copolymers between olefin and vinyl compound and/or acrylic compound.
- Particularly desirable is polypropylene having a melt index of 0.1 to 50 g/10 minutes (ASTM D1238), preferably 0.5 to 20 g/10 minutes.
- the mixing amount of polyolefin is determined in view of the desired properties of the molded article. It is recommended that the ratio of polyethyleneterephthalate to polyolefin fall within a range of between 95 : 5 and 80 : 20.
- the amount of the polyolefin should desirably be 1 to 30% by weight, more preferably 2 to 15% by weight, based on the total amount of the resin composition. If used in an amount of less than 2% by weight of the entire composition, the polyolefin fails to sufficiently enable the resultant composition to exhibit a high resistance to moisture absorption and a high stability under a molten state. If the polyolefin mixing amount is larger than 15% by weight of the entire composition, the molded article tends to be deteriorated in heat resistance and in mechanical properties. In the present invention, it is also possible to add 5 to 150 parts of inorganic reinforcing materials or flame retardants, such as glass fiber, mica and whiskers, based on 100 parts by weight of the resin composition. A molded article prepared from the composition containing these inorganic reinforcing materials, etc., is excellent in its stability under a molten state and resistance to moisture absorption. In addition, the molded article exhibits excellent heat resistance, rigidity and mechanical strength.
- the polyester resin composition of the present invention it is also desirable for the polyester resin composition of the present invention to contain a nucleating agent in order to improve the moldability of the composition under low temperatures.
- a sodium compound and/or a potassium compound can be used as the nucleating agent. It is possible to substitute talc for a part or all of these sodium compounds and potassium compounds.
- Various other nucleating agents can also be used in the present invention.
- a polyethyleneterephthalate having a sodium or potassium atom at a terminal end thereof can be substituted for a part or all of the main component polyester.
- the polyethyleneterephthalate subjected to such a terminal treatment is described in U.S. Patent No. 4,425,470 and can be prepared by the method described in said U.S. Patent.
- the nucleating agent need not be added separately in some cases.
- the composition of the present invention exhibits a satisfactory melt viscosity, even if a plasticizer is not added to the composition. However, it is possible to add a plasticizer for controlling the melt viscosity of the composition. Further, it is possible for the composition of the present invention to contain various additives, such as anti-oxidants and stabilizers.
- the polyester resin composition of the present invention can be prepared by the melt kneading method using various kneaders used in general, including, for example, a Banbury mixer and extruder. For preparing the resin composition of the present invention, all the components of the composition can be put together in a kneader so as to simultaneously knead all the components. Alternatively, the polyolefin can be supplied through a side feeder.
- the polyester resin composition of the present invention exhibits a high stability under a molten state. Thus, fins are unlikely to be formed in the molding step, leading to a good outer appearance of the molded article.
- the molded articles are made uniform in size and weight.
- the composition exhibits a high resistance to moisture absorption.
- pellets of the composition can be supplied directly from a paper bag housing the pellets into a mold. In other words, the pellets supplied into the mold without drying can be molded satisfactorily so as to provide a molded article having a high mechanical strength and a good outer appearance.
- PET shown in Table 1 denotes polyethyleneterephthalate, manufactured by Du Pont de Nemours & Co., Inc., which has an intrinsic viscosity of about 0.67 to 0.58.
- PP shown in Table 1 denotes "polypropylene K1008", which is a trademark and a product of Chisso K.K., having a melt index of 10 g/10 minutes.
- the sodium salt shown in Table 1 denotes
- the resins, nucleating agent, and other additives in amounts (parts by weight) shown in Table 1 were preliminarily mixed for 20 minutes in a tumbler. Then, the resultant mixture was subjected to kneading under a molten state at 290°C by using TEM35B, which is a trademark of a biaxial extruder manufactured by Toshiba Kikai K.K., so as to obtain a resin composition.
- TEM35B which is a trademark of a biaxial extruder manufactured by Toshiba Kikai K.K.
- the melt viscosity of the composition was measured at 280°C under a shearing stress of 1216 sec "1 by using a capirograph manufactured by Toyo Seiki K.K.
- the melt viscosity under a dried state shown in Table 1 denotes the melt viscosity measured under the condition that the water content of the composition pellets used was 0.02% or less and the residence time of the composition in the capirograph was 3 minutes.
- the melt viscosity under the residing state denotes the melt viscosity measured under the condition that the water content of the composition pellets used was 0.02% or less and the residence time of the composition in the capirograph was 30 minutes.
- melt viscosity under the moisture-absorbed state shown in Table 1 denotes the melt viscosity measured under the condition that the water content of the composition pellets used was 0.05%.
- melt viscosity retention rates under the residing state and under the moisture-absorbed state shown in Table 1 were determined as follows:
- R Melt viscosity retention rate under the residing state; A ... Melt viscosity under the residing state; B ... Melt viscosity under the dried state;
- the resin composition was dried at 135°C for 3 hours, followed by preparing, at 290°C, a standard property test piece from the dried composition by using a molding machine with the mold temperature set at 90°C.
- the tensile test and the bending test were conducted in accordance with ASTM-638 and ASTM-790, respectively.
- the Izod impact test was conducted in accordance with ASTM D-256.
- the properties under the moisture-absorbed state denote those of the molded article prepared by using a resin composition containing 0.05% of water. The water content was measured by Karl Fischer method.
- polyester resin compositions of the present invention exhibit the excellent mechanical properties inherent in the polyethyleneterephthalate, and that the compositions are excellent in their stability under a molten state and in their resistance to moisture absorption.
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP92922430A EP0608351A1 (en) | 1991-10-15 | 1992-10-13 | Polyester resin composition |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3/266369 | 1991-10-15 | ||
JP26636991A JPH069860A (en) | 1991-10-15 | 1991-10-15 | Polyester resin composition |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1993008233A1 true WO1993008233A1 (en) | 1993-04-29 |
Family
ID=17429989
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1992/008715 WO1993008233A1 (en) | 1991-10-15 | 1992-10-13 | Polyester resin composition |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0608351A1 (en) |
JP (1) | JPH069860A (en) |
CA (1) | CA2121459A1 (en) |
WO (1) | WO1993008233A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0654502A2 (en) * | 1993-11-19 | 1995-05-24 | Bayer Ag | Polyalkylene terephthalate injection moulding compositions |
WO2007070967A1 (en) * | 2005-12-22 | 2007-06-28 | Vip Plastic Packaging Pty Ltd. | Polymer blends |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3361848A (en) * | 1962-07-27 | 1968-01-02 | Glanzstoff Ag | Injection molded polyester/polyolefin blends |
FR2148000A1 (en) * | 1971-08-05 | 1973-03-11 | Huels Chemische Werke Ag | |
EP0399922A1 (en) * | 1989-05-15 | 1990-11-28 | Eastman Kodak Company | Reinforced polyester molding compositions |
-
1991
- 1991-10-15 JP JP26636991A patent/JPH069860A/en active Pending
-
1992
- 1992-10-13 CA CA 2121459 patent/CA2121459A1/en not_active Abandoned
- 1992-10-13 EP EP92922430A patent/EP0608351A1/en not_active Withdrawn
- 1992-10-13 WO PCT/US1992/008715 patent/WO1993008233A1/en not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3361848A (en) * | 1962-07-27 | 1968-01-02 | Glanzstoff Ag | Injection molded polyester/polyolefin blends |
FR2148000A1 (en) * | 1971-08-05 | 1973-03-11 | Huels Chemische Werke Ag | |
EP0399922A1 (en) * | 1989-05-15 | 1990-11-28 | Eastman Kodak Company | Reinforced polyester molding compositions |
Non-Patent Citations (5)
Title |
---|
Chemical Abstracts, vol. 78, no. 6, 12 February 1973, (Columbus, Ohio, US), see page 46, column 1, abstract no. 30866q, & JP,B,7232294 (TOYO SPINNING CO., LTD) 18 August 1972, see abstract * |
Chemical Abstracts, vol. 87, no. 6, 8 August 1977, (Columbus, Ohio, US), see page 42, column 2, abstract no. 40408s, & JP,A,7733953 (S.C. SHANG) 15 March 1977, see abstract * |
Database WPIL, AN=84-091648 (15), Derwent Publications Ltd, London, GB, & JP,A,59038255 (UNITIKA K.K.) 2 March 1984, see abstract * |
Database WPIL, AN=87-127130 (18), Derwent Publications Ltd, London, GB, & JP,A,62070443 (IDEMITSU PETROCHEM K.K.) 31 March 1987, see abstract * |
Database WPIL, AN=92-295617 (36), Derwent Publications Ltd, London, GB, & JP,A,4202460 (TONEN CORP.) 23 July 1992, see abstract * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0654502A2 (en) * | 1993-11-19 | 1995-05-24 | Bayer Ag | Polyalkylene terephthalate injection moulding compositions |
EP0654502A3 (en) * | 1993-11-19 | 1996-10-09 | Bayer Ag | Polyalkylene terephthalate injection moulding compositions. |
WO2007070967A1 (en) * | 2005-12-22 | 2007-06-28 | Vip Plastic Packaging Pty Ltd. | Polymer blends |
Also Published As
Publication number | Publication date |
---|---|
CA2121459A1 (en) | 1993-04-29 |
EP0608351A1 (en) | 1994-08-03 |
JPH069860A (en) | 1994-01-18 |
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