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EP0608351A1 - Composition de resine polyester - Google Patents

Composition de resine polyester

Info

Publication number
EP0608351A1
EP0608351A1 EP92922430A EP92922430A EP0608351A1 EP 0608351 A1 EP0608351 A1 EP 0608351A1 EP 92922430 A EP92922430 A EP 92922430A EP 92922430 A EP92922430 A EP 92922430A EP 0608351 A1 EP0608351 A1 EP 0608351A1
Authority
EP
European Patent Office
Prior art keywords
resin composition
polyester resin
composition
under
polyethyleneterephthalate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP92922430A
Other languages
German (de)
English (en)
Inventor
Atsushi 4199-1-509 Nagatsuda-Cho Mukohyama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of EP0608351A1 publication Critical patent/EP0608351A1/fr
Withdrawn legal-status Critical Current

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

L'invention concerne des compositions à base de polyéthylèneterephtalate/polyoléfine dont les proportions sont comprises entre 95/5 et 80/20, présentant d'excellentes propriétés de résistance à l'absorption d'humidité, de stabilité à l'état fondu, de résistance thermique, et mécanique.
EP92922430A 1991-10-15 1992-10-13 Composition de resine polyester Withdrawn EP0608351A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP266369/91 1991-10-15
JP26636991A JPH069860A (ja) 1991-10-15 1991-10-15 ポリエステル樹脂組成物
PCT/US1992/008715 WO1993008233A1 (fr) 1991-10-15 1992-10-13 Composition de resine polyester

Publications (1)

Publication Number Publication Date
EP0608351A1 true EP0608351A1 (fr) 1994-08-03

Family

ID=17429989

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92922430A Withdrawn EP0608351A1 (fr) 1991-10-15 1992-10-13 Composition de resine polyester

Country Status (4)

Country Link
EP (1) EP0608351A1 (fr)
JP (1) JPH069860A (fr)
CA (1) CA2121459A1 (fr)
WO (1) WO1993008233A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4339476A1 (de) * 1993-11-19 1995-05-24 Bayer Ag Polyalkylenterephthalat-Spritzgießformmassen
WO2007070967A1 (fr) * 2005-12-22 2007-06-28 Vip Plastic Packaging Pty Ltd. Mélanges de polymères

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE634942A (fr) * 1962-07-27 1900-01-01
DE2139125A1 (de) * 1971-08-05 1973-02-15 Huels Chemische Werke Ag Thermoplastische formmasse aus polyaethylenterephthalat
EP0399922A1 (fr) * 1989-05-15 1990-11-28 Eastman Kodak Company Matières à mouler en polyester renforcées

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9308233A1 *

Also Published As

Publication number Publication date
CA2121459A1 (fr) 1993-04-29
JPH069860A (ja) 1994-01-18
WO1993008233A1 (fr) 1993-04-29

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