Polymer composition

A polymer composition comprises a polymer blend comprising a polyester and a polycarbonate or another polymer blend comprising alpha-methylstyrene-modified ABS resin and at least one polymer selected from a polycarbonate, a saturated polyester, polyphenylene ether, a polyamide and a polyacetal and an organic phosphite compound having the formula (I): ##STR1## in which R is an alkyl having 1 to 9 carbon atoms.

The invention relates to a polymer composition. In particular, the 
invention is directed to a polyester polymer composition which is 
unexpectedly improved in the impact strength, the thermal stability and 
crystallizability and is found to be useful for molded articles. Then it 
is drawn to an improved engineering plastic composition comprising an 
.alpha.-methylstyrene-modified ABS resin and a specific organic phosphite 
compound. 
STATEMENT OF PRIOR ARTS 
Thermoplastic polyester resins represented by polybutylene terephlhalate 
are rapidly finding wide applications because of their features such as 
excellent crystallizability, easy production of excellent moldings at a 
rapid cycle, very low water absorption, good dimensional stability, 
excellent chemical resistance and electrical characteristics, and a marked 
improvement in the properties through glass fiber reinforcement. However, 
because of the excellent crystallizability, the thermoplastic polyester 
resins are unsatisfactory in the impact strength, tend to bring about 
warpage in the case of glass fiber reinforced products, and lower the 
surface gloss. Further, since the Tg value is low, the rigidity at high 
temperatures is inferior to that of polyacetal etc. In order to make up 
for these drawbacks with respect to practical use, studies on polymer 
blends are very active, and a number of combinations of polymers are 
examined. 
For example, polycarbonate has a Tg as high as 150.degree. C. and excellent 
impact resistance and, therefore, is expected to enable the modification 
of the resin by taking advantage of these characteristics. In fact, many 
studies thereon have been made, and the commercialization thereof is in 
progress. As is well known, however, the melt mixing of polybutylene 
terephthalate with polycarbonate brings about random copolymerization 
because of the occurrence of an ester exchange, thus causing 
decomposition, foaming, and discoloration. A method in which a polymer 
having an amide group, an organic phosphite, graphitized polybutadiene, or 
the like is added has been proposed as an expedient for preventing these 
phenomena. However, this method was yet unsatisfactory, and a further 
improvement has been desired. 
Since engineering plastics, such as polycarbonate, saturated polyester, 
polyamide, polyphenylene ether or polyacetal resin, have excellent thermal 
characteristics and mechanical characteristics, they are widely used in 
themselves or after reinforcement with a glass fiber or the like for 
various applications. 
However, even these engineering plastics are often unsatisfactory with 
respect to the mechanical strengths. In order to improve the mechanical 
strengths, modification with other polymer(s), other fiber(s) such as 
carbon fiber, additive(s), etc. is widely utilized for practical purposes. 
For example, in order to improve the low notch impact strength which is one 
of the drawbacks of the engineering plastics, modification with an acrylic 
rubber-containing polymer has been conducted. However, this method 
exhibits only an unsatisfactory effect and cannot impart a desired notch 
impact strength, which imposes a limitation with respect to the 
applications on the engineering plastics. 
The addition of butadiene-containing polymer(s), such as MBS resin or ABS 
resin, was attempted as an expedient for improving the notch impact 
strength of the engineering plastics. However, these resins cannot be 
incorporated in a large amount because they have each a low thermal 
deformation temperature. Therefore, no satisfactory improvement could be 
attained. For this reason, the use of an .alpha.-methylstyrene-modified 
ABS resin having a high thermal deformation temperature was also attempted 
Since, however, the butadiene-containing polymers are poor in the thermal 
stability, despite the use of a necessary antioxidant in the preparation 
process, they cause rapid thermal deterioration and a remarkable change in 
the color tone when they are incorporated in an engineering plastic and 
then processed because the processing temperature of the engineering 
plastic is usually as high as 240.degree. C. or above, which renders these 
polymers unsatisfactory from the practical viewpoint although they can 
provide excellent results with respect to an improvement in the impact 
strength. 
SUMMARY OF THE INVENTION 
The present inventors have made extensive and intensive studies with a view 
to solving the above-described drawbacks. As a result, the present 
inventors have found that a thermoplastic polyester polymer blend 
composition having remarkably improved crystalline properties, very 
excellent thermal stability, and excellent impact strength can be prepared 
by the addition of a specific organic phosphite compound to a polymer 
blend comprising a polyester resin and a polycarbonate resin, thus 
accomplishing the present invention. 
The present inventors have made extensive and intensive studies with a view 
to solving the above-described drawbacks of the engineering plastics. As a 
result, the present inventors have found that an engineering plastic 
composition which is less susceptible to thermal deterioration and 
exhibits excellent moldability and high notch impact strength can be 
prepared by adding a specific organic phosphite compound in improving an 
engineering plastic with an .alpha.-methylstyrene-modified ABS resin, thus 
accomplishing the present invention. 
The invention provides a polymer composition which comprises 
(A) a polymer blend comprising (a-1) a polyester and (a-2) a polycarbonate 
or 
(B) a polymer blend comprising (b-1) .alpha.-methylstyrene-modified ABS 
resin and (b-2) at least one polymer selected from a polycarbonate, a 
saturated polyester, polyphenylene ether, a polyamide and a polyacetal and 
(C) an organic phosphite compound having the formula (I): 
##STR2## 
in which R is an alkyl having 1 to 9 carbon atoms. 
It is preferable that the composition comprises 100 parts by weight of (A) 
or (B) and 0.001 to 10 parts by weight of (C) , more preferably 0.01 to 3 
parts by weight. 
The organic phosphite compound (C) to use in the invention is shown below 
in detail. 
In the compound represented by the above general formula (I), examples of 
the alkyl group represented by R include methyl, ethyl, propyl, isopropyl, 
butyl, sec-butyl, tert-butyl, isobutyl, amyl, tert-amyl, hexyl, octyl, 
isooctyl, 2-ethylhexyl, tert-octyl, and tert-nonyl groups. 
Specific examples of the compounds represented by the above general formula 
(I) which are used in the present invention include 
bis(2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, 
bis(2,6-di-tert-butyl-4-ethylphenyl) pentaerythritol diphosphite, 
bis(2,6-di-tert-butyl-4-isopropylphenyl) pentaerythritol diphosphite, 
bis(2,4,6-tri-tertbutylphenyl) pentaerythritol diphosphite, 
bis(2,6-di-tert-butyl-4-sec-butylphenyl) pentaerythritol diphosphite, 
bis(2,6-di-tert-butyl-4-tert-octylphenyl) pentaerythritol diphosphite, and 
bis(2,6-di-tert-butyl-4-tert-nonylphenyl) pentaerythritol diphosphite. 
The composition of the invention includes two embodiments. One comprises 
(A) and (C). The other comprises (B) and (C). Each embodiment is 
illustrated below. 
Thus the present invention provides an improved polyester polymer blend 
composition comprising a polymer blend composed of a polyester resin and a 
polycarbonate resin, characterized in that said polymer blend further 
comprises an organic phosphite compound represented by the following 
general formula (I). 
The present invention exhibits a particularly significant effect when 
applied to a polymer blend composition composed of a polyester and a 
polycarbonate mainly comprising polybutylene terephthalate having 
relatively excellent crystallization properties and thermal stability. 
Further, the present invention enables a further improvement of a 
polyester polymer blend composed mainly of polyethylene terephthalate or 
the like as well and, therefore, is advantageous from the practical 
viewpoint. 
Representative examples of the polyester used in the present invention 
include polyethylene terephthalate and polybutylene terephthalate. It is 
noted in this connection that the terephthalic acid component or the 
glycol component may be partially substituted with other comonomer 
components. Examples of the comonomer components include bifunctional 
dicarboxylic acids such as isopththalic, nathphalenedicarboxylic, 
diphenoxyethanedicarboxylic, adipic, sebacic, and cyclohexanedicarboxylic 
acids. Examples of the diol component include ethylene, triethylene, 
tetramethylene, hexamethylene, polyethylene, polypropylene, and 
polytetramethylene glycols, and a copolyglycol of polyethylene glycol with 
polypropylene glycol. It is a matter of course that these polyesters may 
be used in the form of a mixture of two or more of them. 
Preferable polyesters include polyethylene terephthalate or a crystalline 
thermoplastic polyester comprising 80 mol% or more of ethylene 
terephthalate repeating units, and polybutylene terephthalate or a 
crystalline thermoplastic polyester comprising 80 mol% or more of butylene 
terephthalate repeating units. 
The polycarbonate resin used in the present invention is at least one homo- 
or copolycarbonates selected from among bisphenol A, nucleus-alkylated 
derivatives thereof, and nucleus-halogenated derivatives thereof. 
There is no particular limitation with respect to the proportions of the 
polyester resin and the polycarbonate resin in the polymer blend of the 
present invention. However, it is generally preferred that the proportions 
of the polyester resin and the polycarbonate resin be 10 to 90% by weight 
and 90 to 10% by weight, respectively. 
Further, in order to improve the impact resistance of the above-described 
polymer blend, it is possible to incorporate an impact resistance 
improver, e.g., other polymer(s) such as maleic anhydride-modified 
polyolefin. In this case, said other polymer(s) may be incorporated in an 
amount of 50% by weight based on the whole resin components. 
Thus the present invention provides an improved engineering plastic 
composition comprising (b-1) an .alpha.-methylstyrene-modified ABS resin, 
(b-2) at least one resin selected from among polycarbonate, saturated 
polyester, polyphenylene ether, polyamide, and polyacetal resins, and (C) 
an organic phosphite compound represented by the following general formula 
(I). 
The .alpha.-methylstyrene-modified ABS resins used in the present invention 
are those prepared by a method which comprises blending a diene polymer 
with an ABS resin, i.e., a product of graft polymerization of styrene with 
acrylonitrile, and an .alpha.-methylstyrene/acrylonitrile copolymer, an 
.alpha.-methylstyrene/acrylonitrile/styrene copolymer, an 
.alpha.-methylstyrene/acrylonitrile/2,5-dichlorostyrene copolymer or an 
.alpha.-methylstyrene/acrylonitrile/methyl acrylate copolymer, a method 
which comprises grafting styrene and acrylonitrile to a diene rubber latex 
and then grafting .alpha.-methylstyrene and acrylonitrile, a method in 
which styrene in the NBR/AS blend is partially replaced with 
.alpha.-methylstyrene, a method which comprises blending a 
butadiene/acrylonitrile/styrene copolymer with an 
.alpha.-methylstyrene/acrylonitrile copolymer, etc. They have each a high 
thermal deformation temperature (generally about 100.degree. C. or above). 
The .alpha.-methylstyrene content of the .alpha.-methyl-styrene-modified 
ABS resin is preferably 15 to 70% by weight, particularly preferably 30 to 
60% by weight. 
There is no particular limitation with respect to the amount of 
incorporation of the .alpha.-methylstyrene-modified ABS resin in the 
above-described engineering plastic. However, the 
.alpha.-methylstyrene-modified ABS resin is generally incorporated in an 
amount of 5 to 70% by weight, particularly 10 to 60% by weight based on 
the whole resin components. 
The polycarbonate resin used in the present invention is at least one homo- 
or copolycarbonate selected from among bisphenol A, nucleus-alkylated 
derivatives thereof, and nucleus-halogenated derivatives thereof. 
Examples of the saturated polyester resin used in the present invention 
include homopolymers, such as polyethylene terephthalate, polypropylene 
terephthalate, polybutylene terephthalate, polyneopentylene terephthalate, 
polyhexylene terephthalate, polyethylene naphthalate, polyhexylene 
naphthalate, and poly-p-ethylenoxybenzoate, and products of substitution 
of part of the above-described acid and/or alcohol component(s) with other 
comonomer component(s). Examples of the comonomer component include, 
besides the above-mentioned terephthalic and naphthalenedicarboxylic 
acids, dicarboxylic acids, such as phthalic, isophthalic, 
4,4'-phenoxyethanedicarboxylic, and adipic acids; and, besides the 
above-described glycols, glycols, such as 1,10-decanediol, 
1,4-cyclohexanedimethanol, diethylene glycol, and polyethylene glycol. 
Examples of the polyphenylene ether resin used in the present invention 
include a polymer prepared by oxidative polycondensation of a phenol 
compound represented by the following formula: 
##STR3## 
wherein R.sub.a in a hydrogen atom, an alkyl group, an alkoxy group, a 
haloalkyl group, or a haloalkoxy group, R.sub.b, R.sub.d, and R.sub.e are 
each a group represented by R.sub.a or a halogen atom and R.sub.c is a 
hydrogen atom or a halogen atom; a graft copolymer prepared by 
polymerizing other polymerizable monomer(s) (e.g., styrene, ethylene, 
propylene, or butadiene) in the presence of the above-described polymer; 
or a copolymer prepared by oxidative coupling of the above-described 
phenolic compound in the presence of other polymer(s) such as polystyrene, 
styrene copolymer, polycarbonate, polysulfone, nylon, polyolefin, and 
rubbery polymer. 
Examples of the polyamide used in the present invention include all 
polyamides, e.g., polymers such as .epsilon.-caprolactam, aminocaproic 
acid, enantholactam, 7-aminoheptanoic acid, 11-aminoundecanoic acid, 
9-aminononanoic acid, .alpha.-pyrrolidone, and .alpha.-piperidone; 
polymers or copolymers prepared by polycondensation of diamines, such as 
hexamethylenediamine, nonamethylenediamine, undecamethylenediamine, 
dodecamethylenediamine, or m-xylenediamine, with dicarboxylic acids, such 
as terephthalic, isophthalic, adipic, sebacic, dodecanedicarboxylic, or 
glutaric acid; and mixtures of these polymers or copolymers. 
The polyacetal resin used in the present invention is a resin prepared by 
using a cyclic oligomer, such as formaldehyde monomer, trimer thereof 
(trioxane), or tetramer thereof (tetraoxane), as a starting material and 
include a copolymer of an oxymethylene homopolymer and the above-mentioned 
formaldehydes with a cyclic ether, such as ethylene oxide or glycols. 
It is preferred that the composition of the present invention be used in 
combination with a phenolic antioxidant. 
Examples of the phenolic antioxidant include 2,6-di-tert-butyl-p-cresol, 
2,6-diphenyl-4-octadecyloxyphenol, 
stearyl(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 
distearyl(3,5-di-tert-butyl4-hydroxybenzyl)phosphonate, thiodiethylene 
glycol bis[(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 
4,4'-thiobis(6-tert-butyl-m-cresol), 
2-octylthio4,6-di(3,5-dihydroxyphenoxy)-s-triazone, 
2,2'-methylenebis(4-methyl-6-tert-butylphenol), 
2,2'-methylenebis(4-ethyl-6-tert-butylphenol), 
bis[3,3bis(4-hydroxy-3-tert-butylphenyl)butyric acid] glycol ester, 
4,4'-butylidenebis(6-tert-butyl-m-cresol), 
2,2'-ethylidenebis(4,6-di-tert-butylphenol), 
2,2'-ethylidenebis(4-sec-butyl-6-tert-butylphenol), 
1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, 
bis[2-tert-butyl-4-methyl-6-(2-hydroxy-3-tert-butyl-5-methylbenzyl)phenyl] 
terephthalate, 1,3,5-tris(2,6-dimethyl-3-hydroxy-4-tert-butylbenzyl) 
isocyanurate, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate, 
1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene, 
1,3,5-tris[(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxyethyl] 
isocyanurate, 
tetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]methane 
, 2-tert-butyl-4-methyl-6-(2'-acryloyloxy-3'-tert-butyl5'-methylbenzyl)phen 
ol, and 
3,9-bis(1',1'dimethyl-2'-hydroxyethyl)-2,4,8,l0-tetraoxaspiro[5.5]undecane 
bis[.beta.-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate]. 
The amount of addition of these phenolic antioxidants is 0.001 to 5 parts 
by weight, preferably 0.01 to 3 parts by weight based on 100 parts by 
weight of the resin. 
A further improvement in the light resistance of the composition of the 
present invention can be attained by adding a light stabilizer thereto. 
Examples of the light stabilizer include 2-hydroxybenzophenones such as 
2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone, 
2,2'-di-hydroxy-4-methoxybenzophenone, and 2,4-dihydroxybenzophenone; 
benzotriazoles such as 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 
2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 
2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole, and 
2-(2'-hydroxy-3',5'-di-tert-amylphenyl)benzotriazole; benzoates such as 
phenyl salicylate, p-tert-phenyl salicylate, 2,4-di-tert-butylphenyl 
3,5-di-tert-butyl-4-hydroxybenzoate, and hexadecyl 
3,5-di-tert-butyl-4-hydroxybenzoate; nickel compounds such as nickel salts 
of 2,2'-thiobis(4-tert-octylphenol), 
[2,2'-thiobis(4-tert-octylphenol)[-n-butylamine, and monoethyl 
(3,5-di-tert-butyl-4-hydroxybenzyl)phosphonate; piperidine compounds such 
as bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, 
bis(l,2,2,6,6-pentamethyl-4-piperidyl) sebacate, 
bis(l,2,2,6,6-pentamethyl-4-piperidyl) 
2-n-butyl-2-(3,5-di-tert-butyl-4-hydroxvbenzyl-)malonate, 
bis(1-acryloyl-2,2,6,6-tetramethyl-4-piperidyl) 
2,2-bis(3,5-di-tert-butyl-4-hydroxybenzyl)malonate, 
tetrakis(2,2,6,6-tetramethyl-4-piperidyl) 1,2,3,4-butanetetracarboxylate, 
tetrakis(l,2,2,6,6-pentamethyl-4-piperidyl) 
1,2,3,4-butanetetracarboxylate, 1-hydroxyethyl-2,2,6,6-tetramethyl-4-piper 
idinol/diethyl succinate condensate, and 
2,4-dichloro-6-tert-octylamino-1,3,5-triazine/l,6-bis(2,2,6,6-tetramethyl4 
-piperidylamino)hexane condensate; substituted acrylonitriles such as 
methyl .alpha.-cyano-.beta.-methyl-.beta.-(p-methoxyphenyl)acrylate and 
oxalic dianilides such as N-2-ethylphenyl-N'-2-ethoxy-5-tert-butylphenyl 
oxalic diamide and N-2-ethylphenyl-N'-2-ethoxyphenyl oxalic diamide. 
If necessary, the composition of the present invention further comprises a 
heavy metal inactivator, a metallic soap, a plasticizer, an epoxy 
compound, a pigment, a filler, a foaming agent, an antistatic agent, a 
fire retardant, a lubricant, a processing aid, etc.

The present invention will now be described in more detail with reference 
to the following examples which should not be construed as limiting the 
scope of the present invention. 
EXAMPLE 1 
______________________________________ 
Blending 
polybutylene terephthalate resin 
20 parts by weight 
polycarbonate resin 80 parts by weight 
organic phosphite compound 
0.3 part by weight 
(see Table 1) 
______________________________________ 
The above components were dry blended. The dry blend was extruded at 
260.degree. C. to form pellets. The pellets were injection molded at 
300.degree. C. to prepare a specimen. With respect to the specimen 
prepared by the adoption of residence within the injection molder and the 
specimen prepared without residence in the injection molder, the Izod 
impact value (23.degree. C., notched) and the color difference (.DELTA.E) 
were measured. The results are shown in Table 1. 
TABLE 1 
______________________________________ 
Izod impact value 
(kg .multidot. cm/cm) 
Organic After resi- 
Color 
phosphite Without dence for differ- 
No. compound* residence 
20 min. ence 
______________________________________ 
Comp. Ex. 
P-1 75 45 6.3 
1-1 
Ex. P-2 80 63 2.1 
1-1 
Ex. P-3 78 59 3.0 
1-2 
______________________________________ 
Note: 
*P1: distearyl pentaerythritol diphosphite 
P2: bis(2,6di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite 
P3: bis(2,6di-tert-butyl-4-ethylphenyl) pentaerythritol diphosphite 
EXAMPLE 2 
The same tests as those of Example 1 were conducted by using the following 
blends. The results are shown in Table 2. 
______________________________________ 
Blending 
polybutylene terephthalate resin 
70 parts by weight 
polycarbonate resin 10 parts by weight 
maleic anhydride-modified ethylene/ 
20 parts by weight 
butene-1 copolymer 
organic phosphite compound 
0.5 part by weight 
(see table 2) 
______________________________________ 
TABLE 2 
______________________________________ 
Izod impact value 
(kg .multidot. cm/cm) 
Organic After resi- 
Color 
phosphite Without dence for differ- 
No. compound residence 
20 min. ence 
______________________________________ 
Comp. Ex. 
P-1 15.8 6.7 6.8 
2-1 
Ex. P-2 17.4 11.2 2.0 
2-1 
Ex. P-3 17.2 10.9 2.5 
2-2 
______________________________________ 
EXAMPLE 3 
Blending 
______________________________________ 
polybutylene terephthalate resin 
75 parts by weight 
polycarbonate resin 25 parts by weight 
tetrakis[methylene-3-(3,5-di-tert- 
0.5 part by weight 
butyl-4-hydroxyphenyl)propionate] 
methane 
pentaerythritol tetralaurylthiopro- 
2.0 part by weight 
pionate 
organic phosphite compound 
0.5 part by weight 
(see Table 3) 
______________________________________ 
The above components were dry blended. The dry blend was extruded at 
260.degree. C. to form pellets. The pellets were injection molded to 
prepare a specimen With respect to the specimen prepared by the adoption 
of residence within the injection molder and the specimen prepared without 
residence in the injection molder, the Izod impact value (23.degree. C., 
notched) and the color difference (.DELTA.E) were measured. The results 
are shown in Table 3. 
TABLE 3 
______________________________________ 
Izod impact value 
(kg .multidot. cm/cm) 
Organic After Color 
phosphite Without residence differ- 
No. compound residence 
for 20 min. 
ence 
______________________________________ 
Comp. Ex. 
P-1 183 76 4.4 
3-1 
Ex. P-2 196 128 2.1 
3-1 
Ex. P-3 192 125 2.3 
3-2 
______________________________________ 
EXAMPLE 4 
______________________________________ 
Blending 
polycarbonate resin 
50 parts by weight 
.alpha.-methylstyrene-modified 
50 parts by weight 
ABS resin*.sup.1 
1,3,5-tris(3,5-di-tert-butyl- 
0.3 part by weight 
4-hydroxybenzyl) isocyanurate 
organic phosphite compound 
0.3 part by weight 
(see Table 4) 
______________________________________ 
Note: *.sup.1 an methylstyrene content of 37.5% 
The above components were dry blended. The dry blend was extruded at 
260.degree. C. to form pellets. The pellets were injection molded at 
280.degree. C. without residence or after residence for 5 min within an 
injection molder, thereby preparing a specimen. The Izod impact value at 
23.degree. C. (notched) and the color difference (.DELTA.E) of the 
specimen were measured. The results are shown in Table 4: 
TABLE 4 
______________________________________ 
Izod impact value 
(kg .multidot. cm/cm) 
organic after 
phosphite without residence 
color 
No. compound residence for 5 min. 
difference 
______________________________________ 
Comp. none 30 10 12.3 
Ex. 4-1 
Comp. P-1 37 16 9.8 
Ex. 4-2 
Ex. 4-1 
P-2 52 34 6.4 
Ex. 4-2 
P-3 50 31 6.7 
______________________________________ 
EXAMPLE 5 
The same tests as those of Example 4 were conducted by using the following 
blends. The results are shown in Table 5. 
______________________________________ 
Blending 
polybutylene terephthalate resin 
80 parts by weight 
.alpha.-methylstyrene-modified ABS 
20 parts by weight 
resin 
1,3,5-tris(3,5-di-tert-butyl- 
0.3 part by weight 
4-hydroxybenzyl) isocyanurate 
organic phosphite compound 
0.3 part by weight 
(see Table 5) 
______________________________________ 
TABLE 5 
______________________________________ 
Izod impact value 
(kg .multidot. cm/cm) 
organic after 
phosphite without residence 
color 
No. compound residence for 5 min. 
difference 
______________________________________ 
Comp. P-1 49 13 6.2 
Ex. 5-1 
Ex. 5-1 
P-2 58 35 4.4 
Ex. 5-2 
P-3 55 33 4.7 
______________________________________ 
EXAMPLE 6 
The tests were conducted in the same way as shown in Example 4 by using the 
following blends. Results are shown in Table 6. 
______________________________________ 
Blending 
nylon 6 75 parts by weight 
.alpha.-methylstyrene-modified 
25 parts by weight 
ABS resin 
tetrakis[methylene-3-(3,5-di- 
0.3 part by weight 
tert-butyl-4-hydroxyphenyl)- 
propionate]methane 
organic phosphite compound 
0.3 part by weight 
(see Table 6) 
______________________________________ 
TABLE 6 
______________________________________ 
Izod impact value 
(kg .multidot. cm/cm) 
organic after 
phosphite without residence 
color 
No. compound residence for 5 min. 
difference 
______________________________________ 
Comp. P-1 85 12 9.7 
Ex. 6-1 
Ex. 6-1 
P-2 98 50 4.3 
Ex. 6-2 
P-3 96 47 4.5 
______________________________________ 
EXAMPLE 7 
The tests were conducted in the same way as shown in Example 4 by using the 
following blends. Results are shown in Table 7. 
______________________________________ 
Blending 
polyphenylene ether resin 
75 parts by weight 
.alpha.-methylstyrene-modified 
25 parts by weight 
ABS resin 
1,3,5-tris(3,5-di-tert-butyl- 
0.3 part by weight 
4-hydroxybenzyl) isocyanurate 
organic phosphite compound 
0.3 part by weight 
(see Table 7) 
______________________________________ 
TABLE 7 
______________________________________ 
Izod impact value 
(kg .multidot. cm/cm) 
organic after 
phosphite without residence 
color 
No. compound residence for 5 min. 
difference 
______________________________________ 
Comp. P-1 23 9 6.1 
Ex. 7-1 
Ex. 7-1 
P-2 32 18 3.7 
Ex. 7-2 
P-3 30 17 3.9 
______________________________________ 
Note: *the same compounds as those listed in Table 4