GB2040958A - Thermoplastic Polyester Molding Composition - Google Patents
Thermoplastic Polyester Molding Composition Download PDFInfo
- Publication number
- GB2040958A GB2040958A GB8001600A GB8001600A GB2040958A GB 2040958 A GB2040958 A GB 2040958A GB 8001600 A GB8001600 A GB 8001600A GB 8001600 A GB8001600 A GB 8001600A GB 2040958 A GB2040958 A GB 2040958A
- Authority
- GB
- United Kingdom
- Prior art keywords
- composition
- composition according
- monomer
- molding composition
- phase
- 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.)
- Granted
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
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/40—Glass
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
-
- 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
- C08K7/04—Fibres or whiskers inorganic
- C08K7/14—Glass
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/04—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to rubbers
Abstract
Moulding compositions comprise poly (C2-C4 alkylene terephthalate) at least 50% of which is polybutylene terephthalate, mica and a multiphase composite polymer having (1) a first elastomeric phase polymerized from C1-C6 alkyl acrylate, crosslinking and graft-linking monomers and (2) a final rigid thermoplastic phase polymerized in the presence of the elastomeric phase. Preferred compositions also include thermally stable reinforcing fibers such as glass fibers.
Description
SPECIFICATION
Molding Composition and Injection Molded Article
Background of the Invention
Polybutylene terephthalate (PBT) reinforced with thermally stable reinforcing fibers such as glass fibers is well known as a molding resin and is described in numerous patents and publications including for instance U.S. 2,814,725, U.S. 4,124,561, U.S. 3,814,786 and U.S. 3,625,024. Fiber reinforcement generally improves the tensile strength, flexural strength, flexural modulus and heat distortion temperature of the molding composition. However, moldings, especially injection moldings of large fiber glass reinforced articles of PBT, nylon and other semicrystalline thermoplastics tend to display distortion or warping while glass fiber reinforced amorphous thermoplastic compounds do not present such problems.It is believed that strains resulting from the different degrees of volumetric contraction parallel to and transverse to the direction of plastic melt flow in to the mold during the cooling of molded articles are responsible for such warping. Orientation of the glass fibers parallel to the direction of melt flow during molding produces this directional difference in volumetric contraction. The warping is thus believed due to the presence of the very reinforcing fibers which contribute to the enhanced physical characteristics of the finished product. It is known that addition of mica to fiberglass reinforced
PBT reduces warping. Unfortunately, the mica also greatly reduces impact strength.
Various impact modifiers are also known which improve the impact strength of molded PBT compositions. Some of these are described for instance in U.S. Patents 4,096,202 and 4,034,013. It is generally believed and unfortunately true, that some modifiers which improve impact characteristics of
PBT or other poly(C2-C4 alkylene terephthalate) molding compositions, including fiber reinforced compositions, also tend to increase the warping characteristics of the compositions.
Summary of the Invention
It is accordingly an object of the invention to provide an improved poly(C2-C4 alkylene terephthalate) molding composition and method for producing same as well as molded articles of such composition. As compared with known prior art compositions, the molded compositions of the invention have an especially desirable combination of properties including less than anticipated warpage and improved impact strength.
Improved polyester molding compositions of the invention consist essentially of at least about 40 wt% poly(C2-C4 alkylene terephthalate) with at least about 50 wt% of such poly(C2-C4 alkylene terephthalate) being polybutylene terephthalate having an intrinsic viscosity between about 0.5 and about 2.0 deciliters per gram (dl/g).Such molding compositions also include:
(a) between about 1 and about 40 wt% based on total molding composition of phlogophite mica flakes having an average particle size between about 40 and about 325 mesh; and
(b) between about 5 and about 30 wt% based on total molding composition of a multiphase composite polymer comprising;;
(1) about 25 to about 95 wt% of a first elastomeric phase polymerized from a momomer system
comprising about 75 to 99.8% by weight C, to C6 alkyl acrylate, 0.1 to 5% by weight
crosslinking momomer, and 0.1 to 5% by weight graftlinking monomer, said crosslinking
monomer being a polyethylenically unsaturated monomer having a plurality of addition
polymerizable reactive groups all of which polymerize at substantially the same rate of
reaction, and said graftlinking monomer being a polyethylenically unsaturated monomer
having a plurality of addition polymerizable reactive groups, at least one of which
polymerizes at a substantially different rate of polymerization from at least one other of said
reactive groups; and
(2) about 75 to 5 wt% of a final, rigid thermoplastic phase polymerized in the presence of said
elastomeric phase.
Preferred compositions of the invention include use of glass or other thermally stable reinforcing fibers and the use of the preferred multiphase polymers described below. Preferred thermally stable reinforcing fibers are glass fibers. Where used, thermally stable reinforcing fibers are preferably present in amounts between about 3 and about 50 wt% based on total molding composition and preferably have diameters between about 5 and about 20 microns and aspect ratios of at least about 5.
Detailed Description
As mentioned above; the invention includes a novel molding composition, molded articles of such composition and method for producing such composition. The molding composition broadly comprises poly(C2-C4 alkylene terephthalate) containing, mica, multiphase composite polymer and preferably thermally stable reinforcing fibers, as described herein.
Polybutylene terephthalate (PBT) used in the invention may be produced in any suitable manner such as by reacting terephthalic acid or a dialkyl ester of terephthalic acid, e.g., dimethyl terephthalate, with diols having four carbon atoms, e.g., tetramethylene glycol. PBT for use in the invention has an intrinsic viscosity (I.V.) between about 0.5 and about 2.0 dl/g measured in orthochlorophenol at 250C, with material having an l.V. between about 0.5 and about 1.1 dl/g being preferred. Munufacture of PBT is well known to those skilled in the art as are the techniques for obtaining PBT of desired intrinsic viscosity. Such conventional production techniques for PBT are discussed in greater detail, for instance, in U.S. Patent 3,465,319.
In addition to PBT, compositions of the invention may also include polyethylene terephthalate (PET) or polypropyiene terephthalate although PBT must, as indicated above, account for at least 50 wt% of the poly(C2-C4 alkylene terephthalate) used. PET and polypropylene terephthalate may, like
PBT: be produced by any suitable conventional methods. PET where used is preferably present in amounts between about 1 and about 35 wt% based on total composition.
Where PET is used in compositions of the invention a nucleating agent such as talc etc. is also preferably employed in amounts between about .01 and about 10 wt% based on total composition.
The PET function is to reduce warpage problems and reduce cost. PET having an intrinsic viscosity between about 0.4 and about 1.2 dl/g as measured in orthochlorophenol at 250C is preferred.
Thermally stable reinforcing fibers used in the invention may be any such fibers which are thermally stable at the conditions normally used in the production of products from PBT molding compositions and include, for instance, fibers of materials such as glass, aramid, calcium sulfate, aluminum metal, boron, asbestos, carbon, fibrous potassium titanate, iron whiskers, etc. Such fibers should normally have diameters between about 5 and about 20 microns and aspect ratios (ratio of
length of fiber to diameter of fiber) of at least about 5. Glass fibers are preferred for use in the invention. Glass fibers, where used, preferably have diameters between about 10 and about 1 5 microns and aspect ratios of at least about 20.
Reinforcing fibers used in the invention are normally used in amounts between about 3 and about 50 wt% based on total weight of total molding composition, more preferably in amounts between about 3 and about 20 wt% on the same basis. As is commonly recognized, the use of such fibers improved substantially such physical properties as tensile strength, flexural strength, flexural modulus and heat distortion temperature of the molding composition. Glass or other fibers for use in the invention may be manufactured and incorporated into the molding composition in any suitable manner, such as by separate extrusion blending with the PBT, extrusion blending with other ingredients of the compositions of the invention or incorporating into the PBT or PBT containing composition during injection molding of products from the molding composition of the invention.
Molding composition of the invention contains between about 1 and about 40 wt% phlogophite mica flake having an average particle size between about 40 and about 325 mesh (i.e. passing through a 40 mesh screen but retained on a 325 mesh screen) with amounts between about 10 and about 30 wt% being preferred. Such mica is readily obtainable from a number of suppliers and is sold for instance by Marietta Resources International under the trade name Suzorite HAR in various size grades.
One commonly used grade of such mica is for instance identified as HAR 60-S and has at least about 90% particles in the size range between about 40 and about 200 mesh.
As mentioned, the invention also required the presence of between about 5 and about 30 wt% based on total molding composition of a multiphase composite polymer comprising:
(1) about 25 to about 95 wt% of a first elastomeric phase polymerized from a monomer system comprising about 75 to 99.8% by weight C1 to C8 alkyl acrylate, 0.1 to 5% by weight crosslinking monomer, and 0.1 to 5% by weight graftlinking monomer, said crosslinking monomer being a polyethylenically unsaturated monomer having a plurality of addition polymerizable reactive groups all of which polymerize at substantially the same rate of reaction, and said graftlinking monomer being a polyethylenically unsaturated monomer having a plurality of addition polymerizable reaction groups, at least one of which polymerizes at a substantially different rate of polymerization from at least one other of said reactive groups; and
(2) about 75 to 5 wt% of a final, rigid thermoplastic phase polymerized in the presence of said elastomeric phase.
The multiphase composite polymer used in compositions of the invention comprises from about 25 to about 95 wt% of a first elastomeric phase and about 75 to 5 wt% of a final rigid thermoplastic phase. One or more intermediate phases are optional, for example, a middle stage polymerized from about 75 to 100 percent by weight styrene. The first stage is polymerized from about 75 to 99.8 wt% C1to C8 acrylate resulting in an acrylic rubber core having a glass transition temperature below about 1 OCC and crosslinked with 0.1 to 5 percent crosslinking monomer and further containing 0.1 to 5 percent by weight graftlinking monomer. The preferred alkyl acrylate is butyl acrylate.The crosslinking monomer is a polyethylenically unsaturated monomer having a plurality of addition polymerizable reactive groups all of which polymerize at substantially the same rate of reaction. Suitable crosslinking monomers include poly acrylic and polymethacrylic esters of polyols such as butylene diacrylate and dimethacrylate, trimethylol propane trimethacrylate, and the like; di- and trivinyl benzene, vinyl acrylate and methacrylate, and the like. The preferred crosslinking monomer is butylene diacrylate. The graftlinking monomer is a polyethylenically unsaturated monomer having a plurality of addition polymerizable reactive groups, at least one of which polymerizing at a substantially different rate of polymerization from at least one other of said reactive groups. The function of the graftlinking monomer is to provide a residuai level of unsaturation in the elastomeric phase, particularly in the latter stages of polymerization and, consequently, at or near the surface of the elastomer particles.
When the rigid thermoplastic phase is subsequently polymerized at the surface of the elastomer,
the residual unsaturated addition polymerizable reactive group contributed by the graftlinking
monomer participates in the subsequent reaction so that at least a portion of the rigid phase is
chemically attached to surface of the elastomer. Among the effective graftlinking monomers are allyl
group-containing monomers of allyl esters of ethylenically unsaturated acids such as allyl acrylate, allyl
methacrylate, diallyl maleate, diallyl fumarate, diallyl itaconate, allyl acid maleate, allyl acid fumarate,
and allyl acid itaconate. Somewhat less preferred are the diallyl esters of polycarboxylic acids which do
not generally have a favorable polymerization rate. The preferred graftlinking monomers are allyl
methacrylate and diallyl maleate.A most preferred interpolymer has only two stages, the first stage
comprising about 60 to 95 percent by weight of the interpolymer and being polymerized from a
monomer system comprising 95 to 99.8 percent by weight butyl acrylate, 0.1 to 2.5 percent by weight
butylene diacrylate as crosslinking agent, 0.1 to 2.5 percent by weight allyl methacrylate or diallyl
maleate as a graftlinking agent, with a final stage polymerized from about 60 to 100 percent by weight
methyl methacrylate.
The final stage monomer system can be comprised of C1 to C18 methacrylate, styrene,
acrylonitrile, alkyl acrylates, allyl acrylates, allyl methacrylate, diallyl methacrylate, and the like, as long
as the overall glass transition temperature is at least about 200 C. Preferably the final stage monomer
system is at least about 50 wt% C1 to C4 alkyl methacrylate. In a preferred embodiment the final stage
monomer system may also contain epoxy functionality. By "epoxy functionality" is meant epoxy units
which are pendant from the final stage polymer. The preferred way of incorporating epoxy functionality
into the final stage polymer is by use of epoxy containing monomer such as glycidyl acrylate or glycidyl
methacrylate in the final stage monomer mixture.Alternate epoxy containing monomers are butadiene
monoepoxide, allyl glycidyl ether,4,5-epoxy pentyl methacrylate or acrylate, 10,11-epoxy undecyl
methacrylate, or other epoxy-containing ethylenically unsaturated monomers. Other ways of
introducing epoxy functionality into the final stage of the multiple stage polymer are possible, such as
post epoxidation. It is further preferred that the final stage polymer be free of units which tend to
degrade poly(alkylene terephthalates), for example, acid, hydroxyl, amino, and amide groups.
For further descriptions and examples of various multiphase polymers suitable for use in the
present invention, reference may be had to the aforementioned U.S. Patent 4,096,202 the disclosure
of which is incorporated herein by reference. Additionai examples of multiphase polymers suitable for
use in the invention may be found in U.S. Patent 4,034,013 the disclosure of which is also
incorporated herein by reference.
The multiphase polymer serves as an impact modifier to improve impact characteristics of
molded articles made from molding composition of the invention. The mica flakes serve a completely
unexpected function in eliminating or very substantially reducing the warpage of molded parts which would normally be expected because of the presence of the multiphase polymer or the combination of multiphase polymer and thermally stable reinforcing fibers in molding composition and products of the invention.
In addition to the ingredients mentioned above, compositions and products of the invention may contain suitable flame retardant additives in amounts up to about 25 wt% based on total molding composition and may contain relatively minor amounts of other materials which do not unduly affect the desired characteristics of the finished product. Such additional materials, may, depending upon the particular compositions employed and products desired, include for instance, colorants and lubricants.
Where present, such additional materials normally comprise no more than about 20 wt% of the total composition or finished product.
In preparing molded compositions of the invention, the reinforcing fibers may be intimately
blended into the PBT by any suitable means such as by dry blending followed by melt blending,
blending in extruders, heated roils or other types of mixers, etc. Conventional master batching techniques may also be used. The same considerations apply to addition of the other essential or
optional ingredients of the composition of the invention. Suitable blending and molding techniques are
well known in the art and need not be described in detail herein.In a preferred embodiment of the
invention, the composition of the invention is compounded by dry blending followed by melt mixing in
an extruder with barrel temperatures between about 240 and about 2700 C. Likewise, in molding
products of the invention from molding compositions of the invention, injection molding is preferred.
When injection molding is used, barrel temperatures between about 25O0C and 2650C are preferred.
In a preferred embodiment, the molding composition of the invention is formed by extrusion and
pelletized. Products of the invention are then produced by injection molding the pelletized extrudate.
As mentioned above, one of the major advantages of the compositions and products of the invention is that the use of mica in molding compositions of the invention substantially reduces shrinkage and warpage otherwise associated with the use of the multiphase polymer or combination of multiphase polymer and reinforcing fibers without substantial harm to the desirable improvements in physical properties associated with the use of such fibers.
While warpage is frequently determined by visual inspection, a quantitative definition can be expressed in terms of percent warp equals (dm-T)x100 where "dm" equals maximum distance from a flat surface to a point on a warped side of the article being evaluated, and "t" equals the thickness of the warped side of the article. This equation defines warp in terms of wall thickness without regard to length of the part. Since some absolute deviation from a straight line gives the same percent warp, a correction for part length must also be included to more accurately define warpage of a part in terms of the visual effect of the warp.Part warp (PW) may therefore be defined as
% warp (dm-t)x100 PW= = L txL wherein PW equals part warp, "L" equals total length of the warp member and the other values are as stated immediately above. In evaluating warpage of samples and products, an average warpage value for a five sided plain box is frequently calculated based upon measurements of warpage of the right, left, front and back sides of the box.
The following examples are intended to illustrate the applicaton and usefulness of the invention without limiting the scope thereof. In the example, all quantities are given in terms of wt% based on total composition unless otherwise specified. Physical properties, including warpage, were measured by the following critieria and reported as an average for samples of each composition tested::
Property Test Procedures
Tensile yield strength ASTM D-638
Flexural yield strength ASTM D-790
Flexural modulus ASTM D-790
Notched Izod impact strength ASTM D-256
Cantilever beam reversed ASTM D-256
Notch Izod impact strength
Percent warp As defined above
Example 1
PBT (0.8 l.V.) was compounded on a Midland Ross 1.5 inch extruder with various amounts of
phlogophite mica and other ingredients as specified below to form various molding compositions as
specified in Table I below. The mica used was Marietta Resources International Suzorite HAR 60-S
mica flake having the following size distribution.
trace -20+40 mesh (U.S. sieve)
76% 40+100 mesh
19% -100+200 mesh
3% -200+325 mesh
2% -325 mesh
Marietta Resources International Suzorite HAR 200-S mica flake was also used. This material had
the following size distribution:
trace -20+40 mesh (U.S. sieve) 1% -40+100 mesh 55% 100+200 mesh
20% 200+325 mesh
24% -325 mesh
The following conditions were employed:: ExtruderZone Temperatures Back Pressure 0-200 1 2700C Amperage 12-25 2 2650C Screw rpm 90
3 260"C 4 2550C Melt temperature 243-251 C
5 2500C
Each of the experimental molding compositions specified in Table I and produced as described above was then molded on a 50 ton 3 ounce reciprocating screw injection molding machine to provide
ASTM test specimens. Parts suitable for measuring warpage (camera slide storage box with four large flat sides) were molded on a 250 ton 36 ounce Impco screw ram machine.Molding conditions were:
3 oz., 50 ton Molding Machine
Barrel temperature front 480"F rear 4800F
nozzle 4800F
Injection pressure 1100 psi
Screw rpm 75
Injection time 10 sec
Mold time 20 sec
Total cycle time 30 sec
Mold temperature 1000F
36 oz., 350 ton Molding Machine
Barrel temperature front 4800F
center 4800F
rear 480"F nozzle 4900F
Measured melt temperature 4200F
Screw rpm 80
Total cycle time 94 sec
Mold temperature 1750F
Mold time 40 sec
Injection pressure 1100 psi
Physical properties were as shown in Table II below.
Table I
Experimental Molding Compounds WtO/o Ingredient 1 2 3
PBT (0.8 I.V.) 25 25 30
PET (0.8 l.V.) 20 20 20
60-S Mica flake 20
200-S Mica flake 20 15
Glass fibers (OCF 419 AA 20 20 20
3/16 inch)
Km 330 Acrylic impact modifier 14.3 14.3 14.3
Acrawax C lubricant 0.2 0.2 0.2
Epon 815 Diepoxy modifier 0.5 0.5 0.5
Table II
Physical Properties of Experimental Molding Compositions
Wt%
1 2 3
% Warp annealed 100 120
% Warp unannealed 81 97
Notched Izod impact strength 1.8 1.7 1.4
(Foot Pounds per Inch)
Cantilever beam reversed notch 7.8 8.2 7.5
Izod impact strength
(foot pounds per inch)
Flexural strength (psi) 18,000 19,100 16,300
Flexural modulus (psi)x 106 1.23 1.27 .90
Tensile strength (psi) 11,430 12,308 10,000
Example 2
In order to evaluate the effect of various additives and combinations of additives or warpage characteristics of injection molded PBT articles, a number of molding compositions were prepared from which parts were molded and tested for warpage, all as described in Example 1. The compositions tested and warpage data obtained are shown in Table Ill.To simplify comparisons, Table Ill also shows warpage as a percent of the warpage obtained using PBT molding compound with no additives. Table III
Warpage of Molded Parts
Warpage
Ingredients(wt%) Annealed Unannealed
KM 330 %Increase %Increase 60-S 200-S Glass Fibers Acrylic or Decrease or Decrease
Composition PBT Mica Mica (OCF 419 AA Impact % from 100% % from 100%
No. (0.8 I.V.) Flake Flake 3/16) Modifier Annealed PBT Unannealed PBT 1 100 150 - 147 2 70 30 399 +249 295 +148 3 85.5 14.5 171 +21 198 +51 4 80 20 107 -43 121 -26 5 80 20 175 +25 161 +14 6 60 20 20 142 -8 121 -26 7 60 20 20 309 +159 228 +81 8 80 20 251 +101 217 +70 9 65.5 20 14.5 100 -50 121 -26 10 65.6 20 14.5 238 +88 197 +50 11 45.5 20 20 14.5 213 +63 171 +24 12 45.5 20 20 14.5 152 +2 126 -21 From Table Ill it can be seen that the presence of mica flakes, especially the 60-S grade, resulted in much less warpage of molded parts than would have been expected based on warpage of parts containing multiphase polymer or a combination of multiphase polymer and glass fibers.
As mentioned above, flame retardant additives may be used in compositions and products of the invention. Preferred flame retardant additives for this purpose include decabromodiphenyl ether, brominated phenylene oxide, brominated polycarbonate, brominated polystyrene, tetrabromo phthalic anhydride and antimony trioxide.
Between about 5 and about 40 wt% based on total molding composition of Poly (C2-C4 alkylene terephthalate-co-alkylene-oxide) is also preferably used in compositions of the invention. Preferred poly (C2-C4 alkylene terephthalate-co-alkylene-oxide) for use in the invention is poly(butylene terephthalate-co-tetramethylene oxide). Suitable Poly (C2-C4 alkylene terephthalate-co-alkyleneoxide) elastomers and their preparation are well known as described for instance in US Patent 3,766,146. Poly(butylene terephthalate-co-tetramethylene oxide) having a Shore D hardness between about 50 and about 60 and a melt index between about 7 and about 9 is particularly preferred.
While the invention has been described above with respect to certain preferred embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention.
Claims (21)
1. Polyester molding composition consisting essentially of at least about 40 wt% poly(C2-C4.
alkylene terephthalate) with at.least about 50 wt% of such poly(C2-C4 alkylene terephthalate) being polybutylene terephthalate having an intrinsic viscosity between about 0.5 and about 2.0 dl/g, such composition containing:
(a) between about 1 and about 40 wt% based on total molding composition of phlogophite mica flakes having an average particle size between about 40 and about 325 mesh; and
(b) between about 5 and about 30 wt% based on total molding composition of a multiphase composite polymer comprising:
(1) about 25 to about 95 wt% of a first elastomeric phase polymerized from a monomer system
comprising about 75 to 99.8% by weight C, to C6 alkyl acrylate, 0.1 to 5% by weight
crosslinking monomer, and 0.1 to 5% by weight graftlinking monomer, said crosslinking
monomer being a polyethylenically unsaturated monomer having a plurality of addition
polymerizable reactive groups all of which polymerize at substantially the same rate of
reaction, and said graftlinking monomer being a polyethylenically unsaturated monomer
having a plurality of addition polymerizable reactive groups, at least one of which
polymerizes at a substantially different rate of polymerization from at least one other of said
reactive groups; and
(2) about 75 to 5 wt% of a final, rigid thermoplastic phase polymerized in the presence of said
elastomeric phase.
2. Composition according to Claim 1 which contains between about 1 and about 40 wt% based on total molding composition of polyethylene terephthalate.
3. Composition according to Claim 2 which also contains between about .01 and about 10 wt% based on total molding composition of a nucleating agent.
4. Composition according to Claim 1, Claim 2 or Claim 3 which also contains between about 3
and about 50 wt% based on total molding composition of thermally stable reinforcing fibers having
diameters between about 5 and about 20 microns and aspect ratios of at least about 5.
5. Composition according to Claim 1 wherein the polybutylene terephthalatein the said at least
40% poly(C2-C4 alkylene terephthalate) provides at least 25 wt% of the composition, and the balance
of the said 40% is polyethylene terephthalate, the composition also including between about 3 and
about 50 wt% based on total molding composition of thermally stable reinforcing fibers having
diameters between about 5 and about 20 microns and aspect ratios of at least about 5.
6. Composition according to Claim 1 wherein the (C2-C4 alkylene terephthalate) is eesentially
polybutylene terephthalate having an intrinsic viscosity between about 0.5 and about 2.0 dl/g, such composition also containing between about 3 and about 50 wt% based on total molding composition of thermally stable reinforcing fibers having diameters between about 5 and about 20 microns and
aspect ratios of at least about 5, with at least about 90% of said mica having particle sizes between
about 40 and about 200 mesh.
7. Composition according to Claim 4, Claim 5 or Claim 6 wherein the reinforcing fibers are glass fibers.
8. Composition according to Claim 7 wherein the glass fibers have diameters between about 10
and about 1 5 microns and aspect ratios of at least about 20.
9. Composition according to any one of the preceding claims wherein the final rigid thermoplastic
phase of the multiphase polymer contains epoxy groups.
10. Composition according to Claim 9 wherein the epoxy groups are derived from glycidyl
acrylate or glycidyl methacrylate.
11. Composition according to any one of the preceding claims wherein said graftlinking monomer is allyl methacrylate or diallyl maleate.
12. Composition according to any one of the preceding claims wherein the crosslinking monomer is butylene diacrylate.
1 3. Composition according to any one of the preceding claims wherein the final rigid thermoplastic phase of the multiphase polymer is polymerized from a monomer system comprising from about 50 to 100 wt% of a C, to Ca alkyl methacrylate.
14. Composition according to any one of the preceding claims wherein the final phase monomer system is free of acid, hydroxyl, amino and amide groups and wherein the glass transition temperature of the final thermoplastic phase is at least about 200C.
1 5. Composition according to any one of the preceding claims wherein at least about 90% of the mica flakes have particle sizes between about 40 and about 200 mesh.
16. Composition according to any one of Claim 1-6 which also contains between about 3 and about 50 wt% based on total molding composition of glass reinforcing fibers having diameters between about 5 and about 20 microns and aspect ratios of at least about 5 and wherein said first phase of the multiphase polymer comprises between about 60 and about 95 wt% of said multiphase polymer, said first phase is polymerized from a monomer system comprising between 95 and about 99.8 percent by weight butyl acrylate, between about 0.1 and about 2.5 wt% butylene diacrylate as a crosslinking agent, and between about 0.1 and about 2.5% allyl methacrylate or diallyl maleate as a graftlinking agent and said final phase of said multiphase polymer is polymerized from about 60 to 100 wt% methyl methacrylate.
1 7. Composition according to Claim 1 wherein the poly(C2-C4 alkylene terephthalate) is essentially polybutylene terephthalate.
18. Composition according to Claim 1 7 which also includes between about 3 and about 50 wt% based on total molding composition of glass reinforcing fibers having diameters between about 5 and about 20 microns and aspect ratios of at least about 5.
1 9. Polyester molding composition substantially as set forth in Example 1 herein.
20. Polyester molding composition substantially as composition 11 or composition 12 of
Example 2 herein.
21. An injection molded article molded from molding composition of any one of the preceding claims.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US459679A | 1979-01-18 | 1979-01-18 |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2040958A true GB2040958A (en) | 1980-09-03 |
GB2040958B GB2040958B (en) | 1983-07-27 |
Family
ID=21711554
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8001600A Expired GB2040958B (en) | 1979-01-18 | 1980-01-17 | Thermo plastic polyester moulding composition |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS5599949A (en) |
CA (1) | CA1130945A (en) |
DE (1) | DE2931430A1 (en) |
FR (1) | FR2446848A1 (en) |
GB (1) | GB2040958B (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0064207A2 (en) * | 1981-04-29 | 1982-11-10 | Bayer Ag | Blends with thermoplastic polyesters, with a high toughness, non ageing and stable in processing |
EP0080599A1 (en) * | 1981-10-30 | 1983-06-08 | General Electric Company | Impact modified glass/mineral reinforced polyester blends |
US4390657A (en) | 1981-10-19 | 1983-06-28 | General Electric Company | Composition of polycarbonate, an ABS resin and an acrylate-methacrylate interpolymer |
EP0233473A2 (en) * | 1986-01-20 | 1987-08-26 | BASF Aktiengesellschaft | Thermoplastic moulding materials based on polycarbonates and polyesters |
US4968731A (en) * | 1987-10-07 | 1990-11-06 | Basf Aktiengesellschaft | Glass fiber reinforced thermoplastic molding compositions based on polyesters and graft polymers |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5693751A (en) * | 1979-12-26 | 1981-07-29 | Gen Aniline & Film Corp | Reinforced polyester molding composition |
JPS57170952A (en) * | 1981-04-15 | 1982-10-21 | Teijin Ltd | Polyester resin composition |
JPS614758A (en) * | 1984-06-20 | 1986-01-10 | Dainippon Ink & Chem Inc | Reinforced polybutylene terephthalate resin composition |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2207162A1 (en) * | 1972-11-20 | 1974-06-14 | Eastman Kodak Co | Polyester moulding materials with increased toughness - from 1,4-butane diol and terephthalic acid, with alkyl (meth) acrylate (co) polymers |
DE2346056A1 (en) * | 1973-09-13 | 1975-04-24 | Basf Ag | FLAME RESISTANT AND SELF-EXTINGUISHING MOLDING COMPOUNDS |
JPS5128141A (en) * | 1974-09-03 | 1976-03-09 | Asahi Chemical Ind | MUKIJUTENZAIGANJUSENJOHORIESUTERUJUSHISOSEIBUTSU NO SEIZOHO |
US4034013A (en) * | 1975-11-13 | 1977-07-05 | Rohm And Haas Company | Impact and melt strength improvement of poly(alkylene terephthalate) |
US4096202A (en) * | 1976-06-09 | 1978-06-20 | Rohm And Haas Company | Impact modified poly(alkylene terephthalates) |
US4195011A (en) * | 1977-07-11 | 1980-03-25 | Gaf Corporation | Injection molding compositions |
US4140670A (en) * | 1977-07-11 | 1979-02-20 | Gaf Corporation | PBT Injection molding composition |
US4200567A (en) * | 1977-08-22 | 1980-04-29 | Rohm And Haas Company | Synergistic impact modifier system for poly (alkylene terephthalates) |
-
1979
- 1979-06-23 CA CA332,375A patent/CA1130945A/en not_active Expired
- 1979-08-02 DE DE19792931430 patent/DE2931430A1/en not_active Ceased
- 1979-09-06 FR FR7922339A patent/FR2446848A1/en active Granted
-
1980
- 1980-01-17 JP JP316180A patent/JPS5599949A/en active Pending
- 1980-01-17 GB GB8001600A patent/GB2040958B/en not_active Expired
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0064207A2 (en) * | 1981-04-29 | 1982-11-10 | Bayer Ag | Blends with thermoplastic polyesters, with a high toughness, non ageing and stable in processing |
EP0064207A3 (en) * | 1981-04-29 | 1983-10-05 | Bayer Ag | Blends with thermoplastic polyesters, with a high toughness, non ageing and stable in processing |
US4390657A (en) | 1981-10-19 | 1983-06-28 | General Electric Company | Composition of polycarbonate, an ABS resin and an acrylate-methacrylate interpolymer |
EP0080599A1 (en) * | 1981-10-30 | 1983-06-08 | General Electric Company | Impact modified glass/mineral reinforced polyester blends |
EP0233473A2 (en) * | 1986-01-20 | 1987-08-26 | BASF Aktiengesellschaft | Thermoplastic moulding materials based on polycarbonates and polyesters |
EP0233473A3 (en) * | 1986-01-20 | 1989-03-15 | Basf Aktiengesellschaft | Thermoplastic moulding materials based on polycarbonates and polyesters |
US4968731A (en) * | 1987-10-07 | 1990-11-06 | Basf Aktiengesellschaft | Glass fiber reinforced thermoplastic molding compositions based on polyesters and graft polymers |
Also Published As
Publication number | Publication date |
---|---|
DE2931430A1 (en) | 1980-07-31 |
CA1130945A (en) | 1982-08-31 |
JPS5599949A (en) | 1980-07-30 |
FR2446848A1 (en) | 1980-08-14 |
FR2446848B1 (en) | 1983-07-08 |
GB2040958B (en) | 1983-07-27 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3701748A (en) | Unsaturated polyester resinous compositions | |
US4140670A (en) | PBT Injection molding composition | |
GB1590549A (en) | Thermoplastic moulding compositions of high impact strength | |
US4409344A (en) | Low shrink unsaturated polyester resinous composition | |
US4283326A (en) | PBT Molding compositions containing mica and a composite polymer | |
CA1272537A (en) | Polyester compositions | |
CA1272538A (en) | Modified polyester compositions | |
EP0246016A2 (en) | High temperature resistant polyester compositions | |
US4298711A (en) | Low shrink unsaturated polyester resinous composition | |
EP0033393A2 (en) | Polyester molding composition and product | |
GB2040958A (en) | Thermoplastic Polyester Molding Composition | |
CN100528962C (en) | High flexible flame retardant PC(polycarbonate)/ABS alloy | |
US20060178488A1 (en) | Polyester compositions for appearance parts | |
US5326822A (en) | Heat-curable molding material | |
CA1119740A (en) | Polyester resin with improved retention of properties | |
KR920004813B1 (en) | Thermoplastic polyester resin compositions | |
JPH0328463B2 (en) | ||
EP1144510B1 (en) | Polyester molding composition | |
US4145331A (en) | Thermoplastic polyester molding compositions with improved heat distortion point | |
US4320045A (en) | Polyester-based molding compositions | |
CA1136314A (en) | Molding composition and injection molded article | |
EP0052642A1 (en) | Flame retardant molding composition. | |
US4810744A (en) | Injection moldable glass fiber reinforced polyester with improved surface finishes | |
KR930010235B1 (en) | Polyester/polycarbonate alloy resin composition | |
JP3487035B2 (en) | PET resin molding material |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19930117 |