JPH03172346A - Resin mixture for molding - Google Patents

Abstract

PURPOSE: To obtain a resin mixture for molding having engineering resin performance characteristics and quick crystallization by mixing poly(ethylene terephthalate), a gals fiber, an aliphatic polyester, an ionic hydrocarbon copolymerization product and an antioxidant.

CONSTITUTION: A molding resin composition comprises (A) 35-75 wt.% (hereinafter '%') poly(ethylene terephthalate) having an inherent viscosity of 0.25 or more, (B) 25-65% glass fiber having an average section thickness of 7-15 μm and an average length of 2-8 mm, (C) 0.5-7% polyester having an average mol.wt. of 7,500-20,000 of a condensation product of an 8-12C dialkanoic acid and a 2-5C dialkanol, (D) 0.1-7% Na or K salt of an ionic hydrocarbon copolymerization product having an average mol.wt. of 3,000 or more of a 2-5C α-olefin and an α,β-ethylenically unsaturated carboxylic acid, at least part of the COOH being neutralized, (E) 0.1-1 antioxidant and (F) 0-3% polyethylene having a mol.wt. of 500 to 10,000.

COPYRIGHT: (C)1991,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Field of the Invention This invention is in the field of glass fiber reinforced polyethylene terephthalate molding resin mixtures.

Glass mu, asbeth l-! Polyethylene terephthalate molding resin mixtures reinforced with iM or fibrous mineral materials are known, in which polyethylene terephthalate mixtures are prepared in conventional water-cooled molds used in the injection molding industry (f: - when the temperature of the molded surface is approx. It is possible to crystallize relatively quickly (at 85 to 110° C.) after injection molding (at a temperature of 85 to 110° C.).

Depending on requirements, of course, oil-cooled molds with higher mold surface temperatures can also be used.

It is difficult to obtain resin mixtures for molding VM fiber-reinforced polyethylene terephthalate that exhibit both fast crystallization and high thermal and mechanical properties that are acceptable on the market. Thus, even when a particular polyethylene terephthalate molding resin mixture exhibits good crystallization properties and some good strength properties after injection molding, for many molding resin mixture applications it has other market-required properties. It may not be suitable because it does not have . For example, apart from crystallization rate, for use in so-called engineering resin applications, glass fiber reinforced polyethylene terephthalate molding resin blends require the following minimum level of 4#4 resin performance characteristics:

Relatively low flow rate after one molding (usually from about 3 to about 10 g/10 min measured at 275°C using 2.16 to 9) Minimum physical strength of the molded body at one room temperature combination, e.g., a bending modulus of about 1.4 x 106 Dsi (984!I/am) or more, about 23
.

7x 10 1) Flexural strength of more than 31 (18,98 to 9/m2), approximately 18x10 psi (12,6
Tensile strength of 6Ky/shoe), breaking point G of 2% or more: ,)j Kel elongation, approximately 1.4ft, lb,
/in, (7,6 to 9・C11/t:m) isot strength knob), and approximately 8ft, 1b, /in
, (43,5xg・z/u> Izot strength (without notches).

Approximately 2 in a shipment of 1 B20 kilopascal (kPa)
Heat distortion temperature after molding of 10℃ or higher.

- A commercially acceptable molding temperature window (range pt+ > - TQ below about 75°C - Tcc below about 117°C - Tm above about 250°C - approx. a Tmc of greater than 200°C and a crystallization window of greater than or equal to about 47; and - a molded product with a smooth, glossy surface after the part is removed from the mold where the mold surface temperature is about 110°C or less; Ability to create.

It is also difficult to obtain glass fiber reinforced polyethylene terephthalate molding mixtures that exhibit post-molding flow rates greater than about 1/10 min (as measured above). One of the prior art attempts to increase polyethylene terephthalate Nisdel bond apparently involved adding water to it in a manner aimed at achieving limited hydrolysis of the Nisdel bond. This method is considered unsatisfactory from a practical standpoint because it is difficult to control the effect of water and the desirable properties of the 11118 mixture appear to be lost with the addition of water.

Glass fiber reinforced poly(1-ethylene terephthalate) resin mixtures with desired combinations of physical and chemical properties, such as the combinations described above, intended for engineering 81 resin applications and therefore accepted on the market may also be used to achieve flame retardancy. It should be possible to have an effective amount of flame retardant material added without significant or commercially unacceptable loss of the properties of such combination. However, the reality is that glass fiber-reinforced, rapidly crystallizing polyethylene phthalate molding resin mixtures not only have a marketable combination of properties, but also can be used as flame retardants without causing unacceptable negative changes in properties. Having the ability to be diluted up to about 115 t and even more has proven to be very difficult.

In the art of reinforced polyethylene terephthalate molding IM resin mixtures, there is a need for loosely crystallizing mixtures with engineering resin performance characteristics.

There is also a need in the art for mixtures of this type that exhibit high post-molding flow rates without the addition of water or the addition of 1121 disintegrants. It is further desirable that such mixtures have flame retardant capabilities to the extent that they can be accepted by the addition of flame retardants without undue reduction in performance properties.

The purpose of this invention is to develop a new and improved class of glass fiber reinforced polyethylenes having an excellent combination of fast crystallization, physical strength, flow rate, heat distortion temperature and mold window temperature. An object of the present invention is to provide a terephthalate composition.

Another object is to provide a composition that can be easily and reliably made by melt extrusion.

Another purpose is to have engineering resin performance characteristics,
It is an object of the present invention to provide a glass fiber reinforced polyethylene phthalate molding composition which is capable of rapid crystallization and has an extremely high flow rate after molding.

Another object is to provide such a composition that can be formed in a conventional manner using conventional equipment and yet obtain engineering performance characteristics with fast crystallization rates.

Another object is to provide such compositions that can be made flameproof by adding additional additives, the addition of which does not result in a significant deterioration of the desired properties.

Another object is to provide a process for the manufacture and use of such compositions.

Further objects, aims, intentions, features, advantages, embodiments, and the like will be apparent to those skilled in the art from the teachings of this IDI as described in the claims.

This invention provides (a) surprisingly and unexpectedly high post-molding flow rates after injection molding; and (b) amazingly and unexpectedly high stray crystallization rates after injection molding - physical strength; A new and highly useful class of glass fiber reinforced polyethylene prephthalate molding resin mixtures with acceptable engineering resin performance properties such as thermal deformation, mold window, and surface appearance is directed.

Fast crystallization rates allow for fast mold cycle times, among other benefits, as those skilled in the art will readily appreciate.

Fast 8! The initial velocity, among other benefits, allows the injected resin to fill all of the space in a complex mold, as those skilled in the art will readily appreciate.

Historically, the molding resin mixture of this invention can be
Even when a selected class of flame retardants is added thereto at levels up to about 20 percent or more, it is possible to achieve such a combination of acceptable performance characteristics to an unexpected and remarkable degree. Hold. This achievement when using such flame retardants indicates that the molding resin mixtures of this invention do not exhibit significant unintended degradation of the polyethylene terephthalate matrix resin under extrusion mixing conditions when using various other flame retardants. It is impossible to even mix without forming, especially if it is not possible to mix it. (The reason is currently unknown) 1!41 for molding of this invention
11. Although the mixture uses multiple additives with polyethylene terephthalate, the desired combination of engineering resin performance properties described above is not achieved if all such components are each brought within the range of the teachings. These additives interact with each other and with the polyethylene terephthalate, as illustrated by the circumstances.

Additive additives may optionally be incorporated into the mixture of the present invention in order to further improve the impact strength of molded articles made by extrusion of the molding resin mixture of the present invention.

More specifically, the molding resin mixture of this invention is a composition (on a difl basis relative to the total amount) comprising:

(a) from about 30 to about 65 percent polyethylene terephthalate having an inherent viscosity of about 0.25 or greater.

(b) about 25 to about 65 percent glass fiber having an average cross-sectional thickness in the range of about 7 to about 15 microns and an average fineness in the range of about 2 to about 8 millimeters.

(C) a dialkanoic acid having an average molecular weight ranging from about 7.500 to about 20.000 and containing from about 8 to about 12 carbon atoms per molecule and from about 2 to about 5 carbon atoms per molecule; From about 0.5 to about 7 weight Φ percent aliphatic polyester that is a condensation product with dialkanol.

(d) alpha olefins containing from about 0.1 to about 7 percent open type and containing from 2 to 5 carbon atoms per molecule and alpha, beta ethylenically unsaturated containing from about 3 to about 5 carbon atoms per molecule; a metal salt of an ionic hydrocarbon copolymer with a carboxylic acid in which the carboxyl groups are at least partially neutralized with cations of said metal; having a molecular weight prior to neutralization of at least about 3,000, wherein said metal is selected from the group consisting of sodium and potassium.

(e) from about 0.1 to about 1 percent antioxidant.

) 0 to about 3 percent heavy chain polyethylene having an average molecular weight ranging from about 500 to about 10,000.

Preferably, the mixture thus described consists essentially of components (a)-(C).

Optionally, to increase impact strength, such admixtures of the present invention contain up to about 3 percent or more of a polymeric epoxy compound of the type containing the condensation product of bisphenol 8 and epichlorohydrin. can additionally be included.

The average number of repeat monomers of bisphenol A/epichlorohydrin per molecule in such a condensate is approximately 0.1.
may range from about 20 to about 20.

For the flame protection of the mixtures of this invention, amounts ranging from 0 to about 20 percent Camellia, and even higher amounts as required (
To this is added a composition consisting essentially of the above (unless changes in other molding properties are objected to).

(a) Brominated polystyrene having a .V-uniform molecular weight of about 200.000 to about 400.000 and a bromine content of about 55 to about 75 weight percent (based on total brominated polystyrene nozzles).

(b) Antimonate of at least one metal selected from Groups ■, ■, and ■ of the periodic table.

The weight ratio of said brominated polystyrene to said antimonate herein ranges from about 2:1 to about 12=1.

The polyethylene terephthalate used here is AST
Approximately 0.25 or more when measured with MD-2857,
Preferably it has an inherent viscosity of about 0.4. The upper limit of the inherent viscosity of polyethylene prephthalate is preferably about 1.2. Inherent sticky melon is 3:
Measured at 30° C. in methylene chloride and acetic acid trifluoride in a volume ratio of 1:1. The polyethylene terephthalate can optionally contain up to 50 percent heavy oil of other comonomers such as diethylene glycol, glutaric acid, polybutylene terephthalate, Mated polyalkylenes, cyclosane dimetatool, and other diols. Mixtures of boreethylene terephthalate resins can be used. Suitable polyethylene terephcrate polymers are commercially available.

The fiberglass fibers are about 7 to 15, preferably about 8h1 to about 1
It has an average new surface thickness of 0 microns and an average length of 2 to about 8 millimeters, preferably about 2.5 to about 5 millimeters. There are many kinds of glass fiber like this.

Polyester The polyester has an average molecular weight of from about 7,500 to about 20,000, preferably from about s, ooo to about 10,000. Preferred dialkanoic acid comonomers for such polyesters contain 8 to 10 carbon atoms per molecule, and preferred dialkanol monomers for such polyesters contain 3 to 4 carbon atoms per molecule.

One of the currently most preferred such polyesters is the condensation product of hivacic acid and 1,2-propanediol. Characteristically, this polyester is in liquid physical form at room conditions. It is believed that the polyester reacts with the resin matrix during extrusion process conditions.

Ionic Hydrocarbon Copolymers Typical ionic hydrocarbon copolymers are olefins (especially ethylene) and acrylics that are at least about 30% neutralized.
! sodium and/or potassium salts of copolymers with lf, methacrylic acid, or mixtures thereof. Suitable polymers are sought after on the market.

Polyester and ionic hydrocarbon copolymers (also known as ethylene acid copolymers or ionomers), in combination with polyethylene terephthalate, induce rapid resolution of polyethylene terephthalate when such a combination It is believed that when melt injected into a mold with a surface temperature of or below 100 mL, they cooperate with each other in a synergistic manner to obtain good molding properties. Typical crystallization times at such mold temperatures are typically about 30 seconds or less.

Polyethylene Polyethylene has an average molecular weight ranging from about 500 to about 10,000, preferably from about 600 to about 3,000. Such polymers are commercially available. Representative material is Eastman (Eastg+an), which is a trademark material.
n) “Epolenc N” from Kagakusha
34” or “Evolene C-10” and 6 Polywax from the Petrolite 5pecia polymer group.
) 1000” included.

Antioxidant Many different antioxidants can be used.

- Preferred antioxidants within the membrane are thermally stable at the process humidity employed. Hindered phenols (al=terphenols with sterically hindering substituents in the ortho position) antioxidants are currently preferred. Currently, the most preferred antioxidant is C1ba-Gc
11 Irganox (Iraano) from i (1'V) company
x) 1010'', the active ingredient of which is tetrakis(methylene 3-[3,5-di-t-butyl-
It is believed to be 4-hydroxyphenyl cobionate) methane. Other suitable antioxidants include:

(8) Bora Warner
- Jiltranox (l1ltranox) 626
“, its active ingredient is bis[2,4-di-butylph-1
Nilpentaerythritol] diphosphite.

(B) Irganox 259 from Jibagaigi Co., Ltd. Its active ingredient is 1,6-hexamethylene bis(3°5-di-
t-butyl-4-hydroxy-hydrocinamate) and/or 1,6-hexamethylenebis(3,-[3,5-
di-t-butyl-4-hydroxyphenyl]-propyl A
Nate).

(C) OXI-Chek 116'' from Ferro, the active ingredient of which is octadecyl 3,5-di-t-butyl-4-hydroxyhydrocinamate; and (D) "Irganox 1098" from Ciba Geigi
, its active ingredient is n,n'-hexamethylenebis[3
, 5-di-t-butyl-4-hydroxy and drocinamide 1.

Such polymers are commercially available. A representative example is Epo, available from Shell Chemical Company.
n) 828", "Epon 1001F", and "1 Bon 1009F".

Preferably, the odor-containing suspension is about 601% of such polymer.
ffi percent or more. Preferably such polymers have an average molecular weight ranging from about 200,000 to about 40°, more preferably from about 225,000 to about 350,000.

Such brominated polystyrene is commercially available.

For the purpose of achieving flame retardant properties, the combination of brominated polystyrene and antimonate (see below) in the resin mixture is preferably greater than or equal to about 41 weight percent of the total resin mixture. The currently preferred weight ratio of brominated polystyrene to antimonate is from about 3=1 to about 10:
It is 1.

Anti-seven! Antimony salts are currently particularly preferred [! is sodium anddimonate, but also preferred are antimony l5041j lead and nickel antimonate and mixtures thereof.

Antimonates are usually used in the form of finely divided particles or powder.

Other Additives In addition to the ingredients discussed herein, the mixtures of this invention include:
Along with the polyethylene prephthalate, other commonly used additives can be included (as known to those skilled in the art), such as coloring agents, molding agents, softening agents, heat and UV stabilizers, fillers, etc. Generally, the total amount of such other additives is within 20 weight ω percent of the total C1 resin u compound, but more can be used if desired.

AWB blend compositions are made by mixing the ingredients together by any conventional method. For example, dry polyethylene terephthalate can be dry mixed with the other ingredients in any suitable mixer or transfer means, and the resulting mixture is melt extruded. Preferably, the polyester is premixed with the glass fibers and then the mixture is dry mixed with other additives as such before melt extrusion.

Typical melt extrusion temperatures t range from about 282 to 304°C. The extrudate is preferably of strand form a'C-1
It can be carved into desired berets or otherwise.

Composition The composition of the molding resin mixture of this invention is summarized in Table 1 below.

Uses and Properties The molding resin blend compositions of this invention are conventionally moldable and are useful in engineering resin applications, for example, as demonstrated by their properties listed below. Table ■ shows the resin of this invention and the compound of about 30 to about 4
Figure 2 shows the properties of moldings made therefrom having a glass fiber content in the range of 5 weight percent (based on 1 ooxi percent of the total alu compound). Table 1 shows the fast crystallization properties and fast mold flow rate properties of these mixtures.

The blended, melt extruded and pelletized compositions of this invention may be prepared in a conventional manner, e.g.
Using injection molding temperatures in the range of typically 85 to 110°C
can be conventionally injection molded into molds with surface temperatures in the range of .

Comment 1 for Table ■: The flow rate (before and after molding) is measured in duram per 10 minutes at 275°C using the method of ASTM D1238 in an extrusion plastometer using a load of 2.16-'r-o crumbs. did.

Sections 2.1 and 2.2, bending modulus and bending strength uAs
According to the method specified in IM 07906.

10 tls+ and tF103Ds
Each is expressed in units of i.

For 2.3 and 2.4 mounds, the tensile strength at the break point and the elongation at the break point were measured by the method specified by ASTM D634 and expressed in 103 psi and percentage, respectively.

Items 2.5 and 2.6, Izo impact strength, notched and unnotched were measured according to the method specified in ASTM D256 and expressed in ft, lb, /in.

Section 3.1, thermal deformation was measured by the method described in ASTM 064B under a load of 1820 kilopascals and expressed in °C.

Section 3.2, "osc" refers to thermal data measured by a differential scanning calorimeter.

Section 3.2.1, IT refers to the glass transition temperature °C
It was displayed in

In Section 3.2.2, 'T c c ' refers to the temperature at which the amorphous polymer starts crystallizing upon heating, and is expressed in °C.

3.2.31'm, "r m" refers to the melting temperature at normal pressure and is expressed in °C.

Section 3.2.4, "-1-m c 11" refers to the temperature at which the molten polymer begins to crystallize, expressed in °C.

Section 3.2.5, II CW II is T　m　--r　a Pointing to the into (here Tmc, -rcc, Tm.

and Tg have the meanings specified above) The crystallization time was measured and displayed in seconds.

The following examples are provided to better illustrate this invention; however, they may unduly limit the scope of this invention. II should not be thought of as limiting.

Examples 1-10 The following examples illustrate the molding resin mixtures of this invention and their properties. All data is based on actual operation, but some numbers are average values from multiple experiments.

A series of dry mixtures are prepared by intermixing the respective components, each mixture having the composition summarized below. Polystyrene terephthalate was initially 1
It was dried in vacuum at 21° C. for about 16 hours. Each U compound was further mixed by melt extrusion through a 38 single screw extruder at a melt temperature of about 304°C.

The melt from the extruder was passed through a wire drawing die and the strands were cold N1 cut into pellets. Beret is about 1
It was dried in vacuum fJl at 21° C. for about 16 hours.

Dry chopped strands with rapid ram 42.5
gram (1.5 oz.) injection molding machine with a 0.1 second delay injection time and a 4 second hold time at approximately 282°C.
It was molded using a cooling time of 2 seconds and an open time of 3 seconds.

The spatial surface temperature of the mold was 113°C. The molded object was subjected to Izot Vji impact test, thermal twist test,
and a ΔSrM standard “tio(l bone)” and impact piece for bending property testing.

The properties of each MA fat mixture and objects molded therefrom are summarized below in Clothing IV. These properties indicate that these mixtures have engineering resin performance characteristics with fast crystallization rates and high post-molding flow rates. Polybrene terephthalate has an inherent viscosity of about 0.65.

2. Glass fiber is manufactured by Owen Corning (OWO)
It can be obtained under the trade name 492-AA from NS-CORNlng). These mNs have an average diameter of about 9 microns and an average length of about 3 millimeters. The fibers are initially clumped.

3. Polyester is C, B, Hall (c, plla)
1 Paraplex from ll)
G25" and is believed to be a condensation product of sebacic acid and 1,2-propanediol. The polyester has a molecular weight of about 8,000.

4. Ethylene acid copolymer is produced by Schulman.
6 Forvion 105 from company n)
'' and is believed to be a copolymer of ethylene and about 10 II percent methacrylic acid, 50 percent by weight neutralized with sodium. It is believed to have an average molecular weight exceeding .

5. The vL formation inhibitor is C1ba-Gei (C1ba-Gei).
QV) from Iroanox
1010'', the active ingredient is tetrakis[methylene 3-(3,5-di-t-butyl-4
-hydroxyphenyl)propionate 1 methane.

6. Poly-1 ethylene is Pctrolite 5speciality P
Poly wax (Polywax) from Polymers group
lywax) 655". This material is a premium wax believed to have an average molecular weight of approximately 700.

7. Sodium antimony is available from M&T Chemical Company as ``Thermoguard''.
It can be obtained under the product name.

8. Brominated polystyrene is manufactured by Lerro Co., Ltd. 68
PB" and is believed to have an average molecular weight of about 280,000 to about 300,000. It is said that it has a bromine content.

(Footnotes to Table ■) 18 & G = ``Smooth and shiny'' V SD = ``Extremely slightly dull SD -'' Slightly dull G = ``Glossy'' In Table 1 ■, all the characteristic items (2) was measured in the same manner and in the same units as described in the comments for Table (2) above, except that the flow rate in Examples 5-10 was measured at 275° C. with a load of 5 kilograms.

Examples 11-13 The following examples illustrate the case of molded resin mixtures of this invention that experienced dramatic property reductions when formulated with flame retardants other than those taught herein for the practice of this invention. explain. All data are based on actual experiments, but some numbers are averages from multiple experiments.

A series of dry mixtures were prepared by mixing the respective components one by one. The composition of each mixture is summarized in Table 1 below. Each mixture was then further warmed in the same melt extruder operated under the same conditions as described in previous Examples 1-10. In each case of these mixtures, it was found that melt extrusion was not possible due to decomposition of the polyethylene derephthalate polymer, flame retardant, and possibly other additives in the extruder barrel. The cause of these observations is currently unknown.

Table VIll Note 1. F, R, A, (Flame retardant A) is tetrabrominated phthalic anhydride 2, F, R, B, (Flame retardant B) is phenoxy-terminated tetrabrominated bisphenol-3, F, n, C, (Flame retardant C) is tetrabrominated bisphenol-A-bis(2-hydroxyedyl ether) 4, and each component shown in the examples in Table V is the same as that shown in the examples in Table ①. .

-''Examples 14 and 15 The procedure of Examples 1 and 3 was repeated, except that 1.0 tl
iffi percent epoxy compound (″Epon ([p
on) 828'') was added to the initial mixture replacing the same amount of polyethylene terephthalate. All results are based on actual experiments, but some numbers are averages of multiple experiments.

After performing melt extrusion and injection molding as described in Examples 1 and 3, the molded articles were evaluated and their properties were as in Examples 1 and 3, except that Izot* impact strength (notched and unnotched) was improved. It turned out to be similar.

Claims (13)

[Claims] (1) A molding resin mixture having a high post-molding flow rate, fast crystallization after injection molding, and engineering resin performance characteristics, wherein the aforementioned mixture reduces the weight of the total mixture to 1
00% and includes the following: (a) about 3 with an inherent viscosity of about 0.25 or more;
0 to about 75 weight percent polyethylene terephthalate. (b) about 25 to about 65 weight percent glass fibers having an average cross-sectional thickness in the range of about 7 to about 15 microns and an average length in the range of about 2 to about 8 millimeters. (c) about 0.5 to about 7 weight percent of a polyester having an average molecular weight of about 7,500 to about 20,000 and containing about 8 to 12 carbon atoms per molecule and a dialkanoic acid per molecule; Condensation products with dialkanols containing from 2 to about 5 carbon atoms. (d) from about 0.1 to about 7 weight percent of alpha olefins containing from 2 to about 5 carbon atoms per molecule and alpha, beta ethylenically monomers containing from about 3 to about 5 carbon atoms per molecule; A metal salt of an ionic hydrocarbon copolymer with a saturated carboxylic acid, in which the carboxyl groups are at least partially neutralized with cations of the aforementioned metal, and wherein the aforementioned copolymer is having an average molecular weight, prior to neutralization, of about 3,000 or more, and wherein said metal is selected from the group consisting of sodium and potassium. (e) from about 0.1 to about 1 weight percent antioxidant. (f) 0 to about 3 weight percent polyethylene having a molecular weight ranging from about 500 to about 10,000. (2) The mixture according to claim (1), comprising a condensate of bisphenol A and epichlorohydrin, and having an average number of bisphenol A/epichlorohydrin repeating units per molecule of about 0. .1 to about 20% by weight of a polymeric epoxy compound. (3) A mixture according to claim (1) or (2), wherein the flame retardant composition consists essentially of greater than 0 and about 2
A mixture characterized in that it additionally contains up to 0 percent by weight. (a) a brominated polystyrene having a molecular weight ranging from about 200,000 to about 400,000, the bromine content being from about 55 to about 75, based on the total weight of said brominated polystyrene; (b) an antimonate of at least one metal selected from Groups I, II or VI of the Periodic Table, the weight of said brominated polystyrene and said antimonate; The ratio is about 2:
One that is in the range of 1 to 12:1. (4) The mixture according to claim (3), wherein the antimonate is sodium antimonate, zinc antimonate, or nickel antimonate. (5) A mixture according to any one of claims (1) to (4), wherein said polyester has a molecular weight in the range of about 8,000 to about 10,000, and sebacic acid and 1. A mixture comprising a condensation product with 2-propanediol. (6) The mixture according to any one of claims (1) to (5), wherein the ionic hydrocarbon copolymer contains ethylene and acrylic acid and/or methacrylic acid. . (7) The mixture according to any one of claims (1) to (6), wherein the antioxidant is a hindered phenol. (8) A mixture according to any one of claims (1) to (7), characterized in that said polyethylene has a molecular weight in the range of about 600 to about 3,000. (9) A mixture according to any one of claims (1) to (8), characterized in that it is prepared by mixing the aforementioned components and melt extruding the mixture. . (10) The mixture according to claim (9), wherein the polyester is premixed with the glass fiber, and then the resulting mixture is additionally mixed with the remaining components. . (11) A process for making a molded article comprising injection molding a mixture according to any one of claims (1) to (10). (12) The process of claim (11), wherein said mixture is heated at a temperature ranging from about 271 to about 304°C.
A process comprising injecting under melt extrusion conditions into a mold having a surface mold temperature of about 110°C or less. 13. The process of claim 12, wherein the article formed as described above crystallizes within 30 seconds after forming.