WO2001030904A1 - Polyethylene terephthalate resin molding and the manufacturing process thereof - Google Patents
Polyethylene terephthalate resin molding and the manufacturing process thereof Download PDFInfo
- Publication number
- WO2001030904A1 WO2001030904A1 PCT/US2000/029802 US0029802W WO0130904A1 WO 2001030904 A1 WO2001030904 A1 WO 2001030904A1 US 0029802 W US0029802 W US 0029802W WO 0130904 A1 WO0130904 A1 WO 0130904A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- molding
- polyethylene terephthalate
- intrinsic viscosity
- terephthalate resin
- solution
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
- B60S1/00—Cleaning of vehicles
- B60S1/02—Cleaning windscreens, windows or optical devices
- B60S1/04—Wipers or the like, e.g. scrapers
- B60S1/32—Wipers or the like, e.g. scrapers characterised by constructional features of wiper blade arms or blades
-
- 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 polyethylene terephthalate resin molding which exhibits excellent mechanical characteristics and, at the same time, is superior in moldability, dimensional stability, appearance characteristics, heat resistance and weatherability; it also relates to the manufacturing process for the resin molding. To be precise, it relates to the moldings in which mechanical strength is particularly required, for example, polyethylene terephthalate moldings such as the moldings which have welded parts including the parts for wipers for wiping the window glasses of ai ⁇ lanes and vehicles like automobiles and electric cars; it also relates to their manufacturing process.
- Thermoplastic polyester resins for example, polyethylene terephthalate and polybutylene terephthalate generally have excellent mechanical and electrical characteristics together with excellent characteristics in chemical resistance and heat resistance.
- the original characteristics of resins are further improved by adding additives like inorganic fillers to thermoplastic polyester resins for suitable applications as molding materials in wide application areas such as electrical insulation parts and automotive parts.
- thermoplastic polyester resin compositions that particularly require mechanical characteristics are the wipers of automobiles, electric cars and airplanes.
- Wipers have wiper blades and wiper arms.
- the wiping part that contacts and wipes out the surface to be wiped such as the glass surface
- the wiper blade is supported by the wiper arm.
- the base (head) that links with this arm is connected with the wiper motor through a multiple number of linking members.
- the wiper arm undertakes reciprocating motions as the motor is actuated, and with the motions the wiping part of the blade wipes out the surface to be wiped such as the glass surface.
- the present inventors investigated the correlation between intrinsic viscosities of moldings and mechanical characteristics in order to solve these problems. As a result, the present inventors uncovered that the moldings, such as parts for wipers, with intrinsic viscosities greater than a specific value had far more significantly improved mechanical characteristics than those of physical property test specimens with the same intrinsic viscosities as specified in ASTM.
- a molding is molded from a polyethylene terephthalate resin and fibrous filler, and it is characterized by the fact that the molding intrinsic viscosity measured at 25°C as a 1% solution in a mixed solution of phenol and dichlorobenzene with the weight ratio of 1/1 exceeds 0.53.
- a molding is characterized by the fact that the above- mentioned polyethylene terephthalate resin composition contains 100 wt parts of a polyethylene terephthalate resin and 17 - 123 wt parts of fibrous filler.
- a molding is characterized by the fact that one of the above-mentioned polyethylene terephthalate resins is a resin the intrinsic viscosity of which exceeds 0.65 when measured at 25°C as a 1% solution in a mixed solution of phenol and dichlorobenzene with the weight ratio of 1/1.
- a molding is characterized by the fact that one of the above-mentioned moldings is a molding provided with a welded part.
- a molding is characterized by the fact that the above- mentioned molding provided with a welded part is a part for wipers.
- a manufacturing process for moldings comprising a polyethylene terephthalate resin composition, comprising (a) a process to prepare a polyethylene terephthalate resin composition by melt-kneading fibrous filler and a polyethylene terephthalate resin the intrinsic viscosity of which exceeds 0.65 when measured at 25°C as a 1% solution in a mixed solution of phenol and dichlorobenzene with the weight ratio of 1/1; and (b) a process to use the aforementioned polyethylene terephthalate resin composition to mold a molding the intrinsic viscosity of which exceeds 0.53 when measured at 25°C as a 1% solution in a mixed solution of phenol and dichlorobenzene with the weight ratio of 1/1.
- Figure 1 is a drawing to describe a test part for measuring the joint strength which is prepared by imagining a joint between the wiper arm and the base; it is also to describe the strength test method.
- Figure 2 is a drawing to describe a test part for measuring the joint strength which is prepared by imagining a joint between the wiper arm and the wiper blade; it is also to describe the strength test method.
- the polyethylene terephthalate (henceforth called PET) used in the present invention includes a linear polyester obtained by condensation polymerization of an acid component with a glycol component in which used as the acid component is terephthalic acid or the ester-forming derivative thereof, and used as the glycol component is ethylene glycol; and a polyester in which part of the acid component and / or glycol component is substituted with a copolymerizable third monomer, for example, a te ⁇ olymer of terephthalic acid, ethylene glycol and a copolymerizable third monomer.
- a copolymerizable third monomer for example, a te ⁇ olymer of terephthalic acid, ethylene glycol and a copolymerizable third monomer.
- Cited for the third monomer that can substitute an acid component are, for example, isophthalic acid, phthalic acid, naphthalenedicarboxylic acids, adipic acid, diphenyldicarboxylic acids and sebacic acid.
- Cited for the third monomer that can substitute the glycol component are propylene glycol, tetramethylene glycol, hexamethylene glycol, neopentyl glycol, diethylene glycol, cyclohexanedimethanol and bisphenols such as 2,2-bis(4- hydroxyphenyl) propane and bis (4-hydroxyphenyl) sulfonate, polyoxyalkylene glycols such as polyoxyethylene glycol, polyoxypropylene glycol and polyoxytetramethylene glycol, and oxyacids such as oxybenzoic acid and hydroxyethoxybenzoic acid.
- PET can be readily manufactured with the general method, for example, melt- condensation polymerization or a method to combine this method with solid phase condensation polymerization.
- Number average molecular weight of PET is 8000 - 50000, preferably 9000 - 45000, more preferably 10000 - 38000.
- the PET used in the present invention may be a PET that has any intrinsic viscosity as long as it can provide a molding the intrinsic viscosity of which exceeds
- the PET intrinsic viscosity exceed 0.65 when PET is disolved in a mixing solution of phenol and dichlorobenzene with the weight ratio of 1/1 to make a 1% solution and the solution viscosity is measured at 25°C; it is more preferable that the viscosity exceed 0.8.
- the intrinsic viscosity of the resultant molding exceeds 0.53 when measured at 25°C as a 1% solution in a mixed solution of phenol and dichlorobenzene with the weight ratio of 1/1.
- inorganic fillers used in the present invention any universally known inorganic fillers can be employed.
- cited may be glass fiber, carbon fiber, potassium titanate, whisker, kaolin, talc and mica.
- the compounding ratio of inorganic fillers can be selected arbitrarily in accordance with the application of moldings such as desired mechanical characteristics and the molding shape. Generally, it is in the range of 17 - 123 wt, preferably 25 - 100 wt parts per 100 wt parts of PET. When the amount of fillers compounded is less than 17 wt parts, sufficient improvement in mechanical characteristics cannot be obtained.
- pu ⁇ ose of improving other characteristics usual additives may be added to the composition used in the present invention within the range that does not impair the objective of the present invention.
- a flame retardant and flame retardant auxiliary may be added for the pu ⁇ ose of improving flame retardancy
- an antioxidant and heat stabilizer may be added for the pu ⁇ ose of improving heat resistance and preventing discoloration.
- other additives are a nucleating agent, lubricant, plasticizer, mold releasing agent, UV stabilizer, dye and pigment.
- the resin composition used in the present invention can be obtained usually by melt-blending PET, fillers and the above-mentioned additives optionally with a usual melt-mixer such as monoaxial or biaxial extruder, Banbury mixer, kneader or mixing roll.
- a usual melt-mixer such as monoaxial or biaxial extruder, Banbury mixer, kneader or mixing roll.
- the entire or part of the components to be compounded may be supplied to the melt-mixer simultaneously or separately.
- the most general method is to dry-blend components in advance followed by melt-kneading with the above-mentioned melt- mixer to homogenize and forming pellets.
- the pellet-shaped resin composition thus prepared is usually kept in the sufficiently dried state and charged into the molding machine hopper for molding.
- the molding of the present invention has an intrinsic viscosity exceeding 0.53.
- the molding intrinsic viscosity is measured at 25°C by dissolving a sample taken from the actually molded molding in a mixed solution of phenol and dichlorobenzene with the weight ratio of 1/1 to make a 1% solution.
- the molding with intrinsic viscosity exceeding 0.53 molded from the polyethylene terephthalate resin compositon of the present invention can be far more significantly improved in its mechanical characteristics than what is observed in the ASTM-specified dumbbell test specimen or flex test specimen that is molded from the same resin composition and has the same intrinsic viscosity.
- such a molding can be readily molded with a usual method from the above-mentioned resin composition compounded with a proper compounding ratio of PET having a proper intrinsic viscosity to inorganic fillers with a common molding machine for thermoplastic resins under the molding conditions set up in accordance with the molding shape.
- the molding of the present invention minimizes losses in the intrinsic excellent characteristics of PET such as mechanical characteristics, heat resistance and electrical characteristics; provides excellent appearance characteristic and dimensional stability to moldings after the resin composition is molded; and, furthermore, significantly improves the molding mechanical characteristics.
- the present invention is able to expand the application of polyethylene terephthalate resin in the areas of automobiles, mechanical parts and electrical/electronic parts to the molding that requires improvement in strength reduction at the section where welding occurs because of molding, for example, the brake booster valve body and gear housing.
- test specimens 120°C, resin temperature 280°C and molding cycle 45 sec to prepare test specimens as specified by the following testing methods.
- a sample taken from the test specimens obtained was dissolved in a mixed solution of phenol and dichlorobenzene with the weight ratio of 1/1 to make a 1% solution, and its intrinsic viscosity was measured at 25°C as the intrinsic viscosity of the test specimen.
- test specimens obtained were used to measure stress-strain properties according to ASTM-D638, flexual modulus of elasticity and bending strength according to ASTM-790, and impact strength according to ASTM-D256.
- a sample taken from the moldings of test parts obtained was dissolved in a mixed solution of phenol and dichlorobenzene with the weight ratio of 1/1 to make a 1% solution, and the intrinsic viscosity was measured as the intrinsic viscosity of the molding.
- test part strength was measured with the following method. Measurement of Part Strength V
- test part shown in Figure 1 is designed by imagining a joint between the wiper arm and the base (head) which supports the wiper arm and also is connected with the wiper motor through a multiple number of links.
- test part shown in Figure 1 has a shape resembling the wiper arm, and comprises molding 1 provided with rotating axis 5 and aluminum-made base 7.
- Molding 1 with a shape resembling the wiper arm is 150 - 500 mm in outside dimensional length (L), 20 - 40 mm in width (W), 15 - 40 mm in height (H) and 1.5 - 5 mm in thickness (T); it has a groove-shaped cross section and a structure that is provided with a pair of side wall 3 which are connected with upper wall 2 and crossing beams (not shown in the figure) formed inside, and rotating axis 5 having a diameter of 7 - 11 mm between side wall 3.
- Base 7 has hinge shape 6 which receives rotating axis 5, freely rotates by hinge shape 6 and rotating axis 5 between a pair of side wall 3 in the direction pe ⁇ endicular to the length (L) direction and is linked with molding 1.
- a load was applied on terminal 4 opposite to the terminal having the base of molding 1 in the direction pe ⁇ endicular to the axis direction of the test part, and also pe ⁇ endicular to the rotating surface.
- load F 1 (N) at the time of rupture was measured.
- Load F 1 is the rupture strength of the joint between molding 1 resembling the wiper arm shape and aluminum-made base 7.
- test part shown in Figure 2 is designed by imagining a joint between the wiper arm and the wiper blade mounted on the tip of the wiper arm.
- the test part shown in Figure 2 comprises molding 1 resembling the wiper arm shape and aluminum-made joint member 10.
- Molding 1 resembling the wiper arm shape is 150 - 500 mm in outside dimension length (L), 20 - 40 mm in width (W), 15 - 40 mm in height (H) and 1.5 - 5 mm in thickness (T); it has a groove-shaped cross section and a pair of side wall 3 which are connected with upper wall 2 and crossing beams (not shown in the figure) formed inside, and the tip of a pair of side wall 3 has hole 8 of 5 mm in diameter.
- Joint member 10 has protrusion 9 on the tip of its both sides. Joint member 10 is installed between a pair of side wall 3 of molding 1 so as to insert protrusion 9 into hole 8.
- Load F2 is the rupture strength of a joint between molding 1 resembling the wiper arm shape and aluminum-made joint member 10.
- the dimension of molding 1 resembling the wiper arm shape was 200 mm in L, 30 mm in W, 30 mm in H and 4 mm in T for both the test part shown in Figure 1 and the test part shown in Figure 2, and the diameter of rotating axis 5 of the test part shown in Figure 1 was 8.5 mm.
- PET Polyethylene terephthalate from terephthalic acid and ethylene glycol the intrinsic viscosity of which is 0.87 when measured at 25°C as a 1% solution in a mixed solution of phenol and dichlorobenzene with the weight ratio of 1/1.
- Antioxidant Inganox 1010 (Trade name) made by Ciba Geigy Co.
- Glass fiber Chopped glass fiber PPG 3563 (Trade name) made by PPG Co.
- Plasticizer Lionon DEH 40 (Trade name) made by Lion K.K.
- Nucleating agent Jet Talc FFR (Trade name) made by Asada Seifun K.K.
- the present invention minimizes losses in the intrinsic excellent characteristics of polyethylene terephthalate resin, such as mechanical characteristics, heat resistance and electrical characteristics; provides excellent appearance characteristics and dimensional stability to the molding after the resin composition is molded; and, furthermore, can provide the molding with significantly improved mechanical characteristics.
- the present invention is able to expand the application of polyethylene terephthalate resin in the areas of automobiles, mechanical parts and electrical/electronic parts to the molding that requires improvement in strength reduction at the welded section, such as the part for wipers.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00974000A EP1238006A1 (en) | 1999-10-27 | 2000-10-27 | Polyethylene terephthalate resin molding and the manufacturing process thereof |
CA002386045A CA2386045A1 (en) | 1999-10-27 | 2000-10-27 | Polyethylene terephthalate resin molding and the manufacturing process thereof |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30612499A JP2001123053A (en) | 1999-10-27 | 1999-10-27 | Polyethylene terephthalate resin molding and its manufacturing method |
JP11/306124 | 1999-10-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001030904A1 true WO2001030904A1 (en) | 2001-05-03 |
Family
ID=17953350
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2000/029802 WO2001030904A1 (en) | 1999-10-27 | 2000-10-27 | Polyethylene terephthalate resin molding and the manufacturing process thereof |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1238006A1 (en) |
JP (1) | JP2001123053A (en) |
CA (1) | CA2386045A1 (en) |
WO (1) | WO2001030904A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008147748A1 (en) * | 2007-05-25 | 2008-12-04 | Sabic Innovative Plastics Ip B.V. | Aerodynamic windshield wiper arm |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW201100622A (en) * | 2009-06-16 | 2011-01-01 | Nien Made Entpr Co Ltd | Curtain manufacture and its manufacturing method |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0233729A2 (en) * | 1986-02-10 | 1987-08-26 | Polyplastics Co. Ltd. | Rotary parts |
US4713407A (en) * | 1986-01-31 | 1987-12-15 | Idemitsu Petrochemical Co., Ltd. | Flame retardant polyester resin composition |
US4737540A (en) * | 1984-10-08 | 1988-04-12 | Mitsubishi Rayon Co., Ltd. | Carbon fiber reinforced polyester resin composition |
WO1996021587A1 (en) * | 1995-01-09 | 1996-07-18 | Sridhar Kota | Compliant force distribution arrangement |
US5869561A (en) * | 1993-05-07 | 1999-02-09 | Sinco Engineering S.P.A. | Articles from a polyester resin reinforced with glass fibre |
-
1999
- 1999-10-27 JP JP30612499A patent/JP2001123053A/en active Pending
-
2000
- 2000-10-27 CA CA002386045A patent/CA2386045A1/en not_active Abandoned
- 2000-10-27 EP EP00974000A patent/EP1238006A1/en not_active Withdrawn
- 2000-10-27 WO PCT/US2000/029802 patent/WO2001030904A1/en not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4737540A (en) * | 1984-10-08 | 1988-04-12 | Mitsubishi Rayon Co., Ltd. | Carbon fiber reinforced polyester resin composition |
US4713407A (en) * | 1986-01-31 | 1987-12-15 | Idemitsu Petrochemical Co., Ltd. | Flame retardant polyester resin composition |
EP0233729A2 (en) * | 1986-02-10 | 1987-08-26 | Polyplastics Co. Ltd. | Rotary parts |
US5869561A (en) * | 1993-05-07 | 1999-02-09 | Sinco Engineering S.P.A. | Articles from a polyester resin reinforced with glass fibre |
WO1996021587A1 (en) * | 1995-01-09 | 1996-07-18 | Sridhar Kota | Compliant force distribution arrangement |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008147748A1 (en) * | 2007-05-25 | 2008-12-04 | Sabic Innovative Plastics Ip B.V. | Aerodynamic windshield wiper arm |
Also Published As
Publication number | Publication date |
---|---|
JP2001123053A (en) | 2001-05-08 |
CA2386045A1 (en) | 2001-05-03 |
EP1238006A1 (en) | 2002-09-11 |
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