CA1081888A - Polyethylene, styrene-butadiene-styrene block copolymer, and ethylene-vinyl acetate copolymer (filled) blend - Google Patents
Polyethylene, styrene-butadiene-styrene block copolymer, and ethylene-vinyl acetate copolymer (filled) blendInfo
- Publication number
- CA1081888A CA1081888A CA266,547A CA266547A CA1081888A CA 1081888 A CA1081888 A CA 1081888A CA 266547 A CA266547 A CA 266547A CA 1081888 A CA1081888 A CA 1081888A
- Authority
- CA
- Canada
- Prior art keywords
- weight
- parts
- vinyl acetate
- ethylene
- polyethylene
- 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.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
- C08L23/0853—Vinylacetate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE: Molding compositions comprising a mixture of polyethylene, polystyrene-polybutadiene-polystyrene block copolymer and an ethylene/vinyl acetate copolymer. The molding compositions exhibit good weldability, are resistant to high shear stresses and have good low temperature resistance.
They may be used for the manufacture of shaped articles and in-jection moldings.
They may be used for the manufacture of shaped articles and in-jection moldings.
Description
O.Z. 31,713 10 8 ~ ~
MOLDING COMPOSITIONS WITH IMPROVED STRESS CRACK RESISTANCE
AND GOOD LOW TEMPERATURE BEHAVIOR
The present invention relates to molding compositions com-prising polyethylene, an ethylene copolymer and a styrene-buta-diene-styrene block copolymer.
The improved stress crack resistance o~ mixtures of poly-ethylene and styrene-butadiene-styrene block-copolymers, as com-pared to pure polyethylene,has been disclosed. However, the said mixtures 108e their good stress crack resistance under high shear stresses, such as may arise, for example, during extrusion of the mixtures.
Mixtures of polyethylene and~an ethylene/vinyl acetate co-:
polymer are-disclo~ed in British Paeent ljO58,670.
The stress crack resistance of~these mixtures i~ substantially better than that of polyethylene. Howeverj moldin~s produced from such compositions have a reduced low temperature resistance .
compared to polyethylene.
; German Laid-Open Application D~S 2,053,067 discloses molding compositions, comprising poiyethylene, an ethylene copolymer and from 0.1 to 5 per cent by weight of N,N'-distearoylethylenediamine, which have improved-stress crack resistance and good low tempera-ture behavior. However, moidings produced from these mixtures are difficult to weld, so that failure can easily occur at the welds.
It is an object of the present invention to provide molding composieions which have good weldability, are resistant to high ~ ' .
shear stresses, and at the same time exhibit improved low temperature behavior, without suffering from a lower stress -crack resistance.
We have found that this object is achieved, ac-cording to the invention, by molding compositions which comprise (A) from 84 to 95 parts by weight of polyethylene which has a density of from 0.915 to 0.935 g/cm3 and a melt index of from 0.005 to 1 [g/10 mi~ , measured by the method of ASTM D
; 10 1238-70 at 190C under 2.16 kg load, (B) from 3 to 10 parts by weight of a polystyrene-polybuta-diene-polystyrene block copolymer containing from 10 to 60 per cent by weight of styrene and from 40 to 90 percent by weight of butadiene and having a molecular weight, determined from its solution viscosity, of from 50,000 to 1,000,000 and (C) from 2 to 6 parts by weight of an çthylene/vinyl acetate copolymer which contains from 25 to 50 percent by weight of vinyl acetate as copolymerized units and has a melt index of from 0.5 to 200 [g/10 mi~ , measured by the method of ASTM D 1238-70 at 190C under 2.16 kg load, with or without the conventional amounts of conventional fillers and stabilizers.
The polyethylene used to manufacture the molding compositions may have been manufactured by the high pressure or low pressure polymerization process. A polyethylene having a density of from 0.915 to 0.935 g/cm3 is used. The melt index of the polyethylene - measured by the method of ASTM D 1238-70 will be from 0.005 to 1, preferably from 0.05 to 0.5.
The second component of the molding compositions of the invention is a polystyrene-polybutadiene-polystyrene block copolymer, which has a styrene o~ntent of from 10 to 60, preferably from 20 to ~ 2 --B
.... .. . .. . . ~ ~ . .. .... . . .
0 8 1~P6~
_ O.Z. 31,713 50, per cent by weight, and a butadiene content of from 40 to 90, preferably from 80 to 50, per cent by weight. The molecular weight of the block copolymer, determined from its solution viscosity, is from 50,000 to 1,000,000 and the proportion by weight of the block copolymer in 100 parts by weight of the molding composition is from 3 to 10, preferably from 3 to 8,-parts bei weight.
The third component is a copolymer of ethylene and vinyl acetate, which contains from 25 to 50, preferably from 30 to 40, per cent by weight of vinyl acetate as copolymerized units. The melt~ndex of the copolymer, measured by the method of AST~ D 1238-70 at 190C under
MOLDING COMPOSITIONS WITH IMPROVED STRESS CRACK RESISTANCE
AND GOOD LOW TEMPERATURE BEHAVIOR
The present invention relates to molding compositions com-prising polyethylene, an ethylene copolymer and a styrene-buta-diene-styrene block copolymer.
The improved stress crack resistance o~ mixtures of poly-ethylene and styrene-butadiene-styrene block-copolymers, as com-pared to pure polyethylene,has been disclosed. However, the said mixtures 108e their good stress crack resistance under high shear stresses, such as may arise, for example, during extrusion of the mixtures.
Mixtures of polyethylene and~an ethylene/vinyl acetate co-:
polymer are-disclo~ed in British Paeent ljO58,670.
The stress crack resistance of~these mixtures i~ substantially better than that of polyethylene. Howeverj moldin~s produced from such compositions have a reduced low temperature resistance .
compared to polyethylene.
; German Laid-Open Application D~S 2,053,067 discloses molding compositions, comprising poiyethylene, an ethylene copolymer and from 0.1 to 5 per cent by weight of N,N'-distearoylethylenediamine, which have improved-stress crack resistance and good low tempera-ture behavior. However, moidings produced from these mixtures are difficult to weld, so that failure can easily occur at the welds.
It is an object of the present invention to provide molding composieions which have good weldability, are resistant to high ~ ' .
shear stresses, and at the same time exhibit improved low temperature behavior, without suffering from a lower stress -crack resistance.
We have found that this object is achieved, ac-cording to the invention, by molding compositions which comprise (A) from 84 to 95 parts by weight of polyethylene which has a density of from 0.915 to 0.935 g/cm3 and a melt index of from 0.005 to 1 [g/10 mi~ , measured by the method of ASTM D
; 10 1238-70 at 190C under 2.16 kg load, (B) from 3 to 10 parts by weight of a polystyrene-polybuta-diene-polystyrene block copolymer containing from 10 to 60 per cent by weight of styrene and from 40 to 90 percent by weight of butadiene and having a molecular weight, determined from its solution viscosity, of from 50,000 to 1,000,000 and (C) from 2 to 6 parts by weight of an çthylene/vinyl acetate copolymer which contains from 25 to 50 percent by weight of vinyl acetate as copolymerized units and has a melt index of from 0.5 to 200 [g/10 mi~ , measured by the method of ASTM D 1238-70 at 190C under 2.16 kg load, with or without the conventional amounts of conventional fillers and stabilizers.
The polyethylene used to manufacture the molding compositions may have been manufactured by the high pressure or low pressure polymerization process. A polyethylene having a density of from 0.915 to 0.935 g/cm3 is used. The melt index of the polyethylene - measured by the method of ASTM D 1238-70 will be from 0.005 to 1, preferably from 0.05 to 0.5.
The second component of the molding compositions of the invention is a polystyrene-polybutadiene-polystyrene block copolymer, which has a styrene o~ntent of from 10 to 60, preferably from 20 to ~ 2 --B
.... .. . .. . . ~ ~ . .. .... . . .
0 8 1~P6~
_ O.Z. 31,713 50, per cent by weight, and a butadiene content of from 40 to 90, preferably from 80 to 50, per cent by weight. The molecular weight of the block copolymer, determined from its solution viscosity, is from 50,000 to 1,000,000 and the proportion by weight of the block copolymer in 100 parts by weight of the molding composition is from 3 to 10, preferably from 3 to 8,-parts bei weight.
The third component is a copolymer of ethylene and vinyl acetate, which contains from 25 to 50, preferably from 30 to 40, per cent by weight of vinyl acetate as copolymerized units. The melt~ndex of the copolymer, measured by the method of AST~ D 1238-70 at 190C under
2.16 kg load Will be from 0.5 to 200, preferably from 5 to 100 Lg/10 min].
j 100 parts by weight of the moiding composition of the invention contain from 2 to 6, preferably from 3 to 5, parts by weight of the copolymer of ethylene and vinyl acetate. However, in place of an ethylene/vinyl acetate copolymer it is also possible to employ co-polymers of ethylene and esters of acrylic acid or methacrylic acid with alcohols of 1 to 8 carbon atoms. In that casej 100 parts by weight of the molding composition of the invention contain from 2 to 6 parts by weight of the copolymer. The melt index o~ the e~hylene/acrylic acid ester or ethylene/methacrylic acid ester copolymer is also from 0.5 to 200 Cg/10 mi~ , and-the proportion of copolymerized units of acrylic acid ester or methacrylic acid ester in the copolymer is from 20 to 60, preferably from 25 to 50, ;~ per cent by weight, The molding compositions of the invention may also contain oonventional 5tabilizers and/or conventional fillers, e.g. chalk or carbon black. The use of the stabilizer 4,4'-thio-bis-(3-methyl- -6-tert.-butyl-1-phenol), in amounts of up to one per cent by weight, preferably of from 0.05 to 0.3 per cent by weight, based on the ` -molding oomposition5, is prsrerred.
. .
108~
O.Z. 31,713 The molding compositions of the invention may be manufactured by conventional methods, eOg. by mixing the three stated components `
at from 100 to 300C, preferably from 150 to 200C, in kneaders, mills or twin-screw or single-screw extrudersO
; The molding compositions of the invention may be used for the manufacture of shaped articles, e.g. pipes,-cables, profiles, hollow bodies and injection moldings. They may be processed on conventional molding equipment.
The Examples and Comparative Examples which follow illustrate 1l 10 the invention.
,! EXAMPLE 1 8908 parts by weight of polyethylene which has a density of 0.918 g/cm3 and a melt index of 0018 g/10 mins (measured by the method of ASTM D 1238-70 at 190C under 2.16 kg load), 0.2 part by weight Or the stabilizer 4,4'-thio-bis-(3-methyl-6-tert.-butyl-1-phenol) (I) and 10 parts by weight of a copolymer of 72 per cent by weight of ethylene and 28 per cent by weight of vinyl acetate, having a melt index of 30 g/lO mins, are-homogenized at 154 C in a roll kneader (Brabender Plastographj running at 125 rpm.
The homogeneous mixture is then-kneaded for one hour under the above conditions~ 3 mm thick sheets are pressed from the mixture ~1 which has been subjected to these stresses and are chilled. Test specimens according to ASTM 1693-70 are produced from these sheets, and are conditioned for 18 hours at 70C and then tested. In the brittleness temperature test by the method of ASTM-D 746, of test specimens obtained from pressed sheets produced as described in ASTM.; D 1928-70, procedure A, 50% failure is observed at -60C. On testing the specimens by the method of ASTM D 1693-70 for stress cracking, no failures are detectable after 1,000 hours. The con-centration of the reagent used was 10%, representing a modifica-tion of the ASTM.`D 1693-70 procedure.
_ 4 _ .
..... . . . . . . . . .
. . . : , . .
-- OOZo 31,713 EXAMPLE 2 (Compa~ive) Test specimens are produced, in accordance with the descrip-tion of Example 1, from 91o 8 parts by weight of polyethylene, 0.2 part by weight of stabilizer I and 8 parts by weight of a polystyrene-polybutadiene-polystyrene block copolymer having a styrene content of 30 per cent by weight and a butadiene content of 70 per cent by weight, the molecular weight, determined from the solution viscosity, being 120,000. The stress crack resistance of the specimens is tested as indicated in Example 1 and it is found that after only four hours 50% of the samples have cracked.
Test specimens are produced, using the method described in Example 1, from 9008 parts by weight of polyethylene having a density of 0,918 g/cm3 and a melt index of 0018 g/10 mins~ 0.2 part by weight of stabilizer I, 3 parts by weight of an ethylene~
vinyl acetate copolymer which contains 40 per cent by weight of vinyl acetate as copolymerized units and has a melt index of 40 g/10 mins and 6 parts by weight of the polystyrene-poly-butadiene-polystyrene block copolymer defined in Example 2. The ~ -stress crack resistance of the specimens is tested by the method described in Example 1, representing a modification of the ASTM-D 1693-70 procedureO No failures are detectable after 1,000 hours. On testing the low temperature behavior by the method of ASTM~D 746, as described in Example 1, no fracture is found at -72C, Test specimens are produced by the method described in Example 1 from 91.3 parts by weight of polyethylene (D = 0.918 g~cm3, MFI = 0018 g/10 mins), 0.2 part by weight of stabilizer I, 405 parts by weight of the polystyrene-polybutadiene-poly-styrene block copolymer defined in Example 2 and 4.5 parts by weight of a copolymer of 70 per cent by weight of ethylene and ,: . .. .: . . . . : ., - . . . -- . . . . . . .. . :. .. .. ~
O.ZO 31,713 30 per cent by weight of vinyl acetate, and their stress crack resistance is testedO Even after 1,000 hours, no failures are ~ discernibleO On testing the low temperature behavior by the - method of ASTM-D 746, no ~ailures are found at -72C.
EXAMPLE 5 (Comparative) Using the method described in Example 1,-test specimens according to ASTM 1,693 are produced from 96.6 parts by weight of polyethylene (D - 0.918 g/cm3, MFI = 0.18 g/10 mins), 0.1 part ~/ by weight of stabilizer I, 2 parts by weight of an ethylene/vinyl l~ acetate copolymer which contains 40 per cent by-weight Or vinyl acetate as copolymerized units and has a-melt index of 40 g/10 mins, and one part by weight Or NjN'-distearoylethylenediamine. Pairs o~ these test specimens are half overlapped and weided at 150C
under a pressure of about 2 kp/cm2. These welded samples are bent in a U-shape and kept at 50C in the 10% strength reagent solution used in Example 1 (ASTM 1693-70)0 After 48 hours, more than 70 o~ the welds had split openO - -Test specimens of mixtures obtained according to Examples 3 ~ or 4 are overlapped and welded as described above. After a test ;~ o~ 200 hours in the detergent solution, the weld has not split open on any of the test specimens.
:~
,, ,, . , ,
j 100 parts by weight of the moiding composition of the invention contain from 2 to 6, preferably from 3 to 5, parts by weight of the copolymer of ethylene and vinyl acetate. However, in place of an ethylene/vinyl acetate copolymer it is also possible to employ co-polymers of ethylene and esters of acrylic acid or methacrylic acid with alcohols of 1 to 8 carbon atoms. In that casej 100 parts by weight of the molding composition of the invention contain from 2 to 6 parts by weight of the copolymer. The melt index o~ the e~hylene/acrylic acid ester or ethylene/methacrylic acid ester copolymer is also from 0.5 to 200 Cg/10 mi~ , and-the proportion of copolymerized units of acrylic acid ester or methacrylic acid ester in the copolymer is from 20 to 60, preferably from 25 to 50, ;~ per cent by weight, The molding compositions of the invention may also contain oonventional 5tabilizers and/or conventional fillers, e.g. chalk or carbon black. The use of the stabilizer 4,4'-thio-bis-(3-methyl- -6-tert.-butyl-1-phenol), in amounts of up to one per cent by weight, preferably of from 0.05 to 0.3 per cent by weight, based on the ` -molding oomposition5, is prsrerred.
. .
108~
O.Z. 31,713 The molding compositions of the invention may be manufactured by conventional methods, eOg. by mixing the three stated components `
at from 100 to 300C, preferably from 150 to 200C, in kneaders, mills or twin-screw or single-screw extrudersO
; The molding compositions of the invention may be used for the manufacture of shaped articles, e.g. pipes,-cables, profiles, hollow bodies and injection moldings. They may be processed on conventional molding equipment.
The Examples and Comparative Examples which follow illustrate 1l 10 the invention.
,! EXAMPLE 1 8908 parts by weight of polyethylene which has a density of 0.918 g/cm3 and a melt index of 0018 g/10 mins (measured by the method of ASTM D 1238-70 at 190C under 2.16 kg load), 0.2 part by weight Or the stabilizer 4,4'-thio-bis-(3-methyl-6-tert.-butyl-1-phenol) (I) and 10 parts by weight of a copolymer of 72 per cent by weight of ethylene and 28 per cent by weight of vinyl acetate, having a melt index of 30 g/lO mins, are-homogenized at 154 C in a roll kneader (Brabender Plastographj running at 125 rpm.
The homogeneous mixture is then-kneaded for one hour under the above conditions~ 3 mm thick sheets are pressed from the mixture ~1 which has been subjected to these stresses and are chilled. Test specimens according to ASTM 1693-70 are produced from these sheets, and are conditioned for 18 hours at 70C and then tested. In the brittleness temperature test by the method of ASTM-D 746, of test specimens obtained from pressed sheets produced as described in ASTM.; D 1928-70, procedure A, 50% failure is observed at -60C. On testing the specimens by the method of ASTM D 1693-70 for stress cracking, no failures are detectable after 1,000 hours. The con-centration of the reagent used was 10%, representing a modifica-tion of the ASTM.`D 1693-70 procedure.
_ 4 _ .
..... . . . . . . . . .
. . . : , . .
-- OOZo 31,713 EXAMPLE 2 (Compa~ive) Test specimens are produced, in accordance with the descrip-tion of Example 1, from 91o 8 parts by weight of polyethylene, 0.2 part by weight of stabilizer I and 8 parts by weight of a polystyrene-polybutadiene-polystyrene block copolymer having a styrene content of 30 per cent by weight and a butadiene content of 70 per cent by weight, the molecular weight, determined from the solution viscosity, being 120,000. The stress crack resistance of the specimens is tested as indicated in Example 1 and it is found that after only four hours 50% of the samples have cracked.
Test specimens are produced, using the method described in Example 1, from 9008 parts by weight of polyethylene having a density of 0,918 g/cm3 and a melt index of 0018 g/10 mins~ 0.2 part by weight of stabilizer I, 3 parts by weight of an ethylene~
vinyl acetate copolymer which contains 40 per cent by weight of vinyl acetate as copolymerized units and has a melt index of 40 g/10 mins and 6 parts by weight of the polystyrene-poly-butadiene-polystyrene block copolymer defined in Example 2. The ~ -stress crack resistance of the specimens is tested by the method described in Example 1, representing a modification of the ASTM-D 1693-70 procedureO No failures are detectable after 1,000 hours. On testing the low temperature behavior by the method of ASTM~D 746, as described in Example 1, no fracture is found at -72C, Test specimens are produced by the method described in Example 1 from 91.3 parts by weight of polyethylene (D = 0.918 g~cm3, MFI = 0018 g/10 mins), 0.2 part by weight of stabilizer I, 405 parts by weight of the polystyrene-polybutadiene-poly-styrene block copolymer defined in Example 2 and 4.5 parts by weight of a copolymer of 70 per cent by weight of ethylene and ,: . .. .: . . . . : ., - . . . -- . . . . . . .. . :. .. .. ~
O.ZO 31,713 30 per cent by weight of vinyl acetate, and their stress crack resistance is testedO Even after 1,000 hours, no failures are ~ discernibleO On testing the low temperature behavior by the - method of ASTM-D 746, no ~ailures are found at -72C.
EXAMPLE 5 (Comparative) Using the method described in Example 1,-test specimens according to ASTM 1,693 are produced from 96.6 parts by weight of polyethylene (D - 0.918 g/cm3, MFI = 0.18 g/10 mins), 0.1 part ~/ by weight of stabilizer I, 2 parts by weight of an ethylene/vinyl l~ acetate copolymer which contains 40 per cent by-weight Or vinyl acetate as copolymerized units and has a-melt index of 40 g/10 mins, and one part by weight Or NjN'-distearoylethylenediamine. Pairs o~ these test specimens are half overlapped and weided at 150C
under a pressure of about 2 kp/cm2. These welded samples are bent in a U-shape and kept at 50C in the 10% strength reagent solution used in Example 1 (ASTM 1693-70)0 After 48 hours, more than 70 o~ the welds had split openO - -Test specimens of mixtures obtained according to Examples 3 ~ or 4 are overlapped and welded as described above. After a test ;~ o~ 200 hours in the detergent solution, the weld has not split open on any of the test specimens.
:~
,, ,, . , ,
Claims (5)
1. A molding composition comprising A) from 84 to 95 parts by weight of polyethylene which has a density of from 0.915 to 0.935 g/cm3 and a melt index of from 0.005 to 1 g/10 min , measured by the method of ASTM D
1238-70 at 190°C under 2.16 kg load, B) from 3 to 10 parts by weight of a polystyrene-polybuta-diene-polystyrene block copolymer containing from 10 to 60 percent by weight of styrene and from 40 to 90 percent by weight of butadiene and having a molecular weight, determined from its solution viscosity of from 50,000 to 1,000,000 and C) from 2 to 6 parts by weight of an ethylene/vinyl acetate copolymer which contains from 25 to 50 percent by weight of vinyl acetate as copolymerized units and has a melt index of from 0.5 to 200 g/10 min , measured by the method of ASTM D 1238-70 at 190°C under 2.16 kg load.
1238-70 at 190°C under 2.16 kg load, B) from 3 to 10 parts by weight of a polystyrene-polybuta-diene-polystyrene block copolymer containing from 10 to 60 percent by weight of styrene and from 40 to 90 percent by weight of butadiene and having a molecular weight, determined from its solution viscosity of from 50,000 to 1,000,000 and C) from 2 to 6 parts by weight of an ethylene/vinyl acetate copolymer which contains from 25 to 50 percent by weight of vinyl acetate as copolymerized units and has a melt index of from 0.5 to 200 g/10 min , measured by the method of ASTM D 1238-70 at 190°C under 2.16 kg load.
2. A molding composition as claimed in claim 1 con-taining as component (C) an ethylene/vinyl acetate copolymer which contains 30 to 40 percent by weight of vinyl acetate as copolymerized units.
3. A molding composition as claimed in claim 1 containing 87 to 94 parts by weight of component (A), 3 to 8 parts by weight of component (B) and 3 to 5 parts by weight of component (C).
4. A molding composition as claimed in claim 1 containing chalk or carbon black as filler.
5. A molding composition as claimed in claim 1 containing 0.05 to 0.3 percent by weight of 4,4'-thio-bis-(3-methyl-6-tert.butyl-1-phenol) as stabilizer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19752555078 DE2555078A1 (en) | 1975-12-06 | 1975-12-06 | MOLDING COMPOUNDS WITH INCREASED RESISTANCE TO THE FORMATION OF STRESS Cracks AND GOOD LOW TEMPERATURE RESISTANCE |
| DEP2555078.1 | 1975-12-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1081888A true CA1081888A (en) | 1980-07-15 |
Family
ID=5963771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA266,547A Expired CA1081888A (en) | 1975-12-06 | 1976-11-25 | Polyethylene, styrene-butadiene-styrene block copolymer, and ethylene-vinyl acetate copolymer (filled) blend |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS5269952A (en) |
| BE (1) | BE848733A (en) |
| CA (1) | CA1081888A (en) |
| DE (1) | DE2555078A1 (en) |
| FR (1) | FR2333827A1 (en) |
| GB (1) | GB1559182A (en) |
| IT (1) | IT1063995B (en) |
| NL (1) | NL7613046A (en) |
| SE (1) | SE7613677L (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS572351A (en) * | 1980-06-04 | 1982-01-07 | Sumitomo Chem Co Ltd | Preparation of polypropylene resin molded article |
| DK262081A (en) * | 1980-06-20 | 1981-12-21 | Ucb Sa | HEAT-SEALABLE PACKAGING MOVIES WHICH PROVIDE A SEPARATE SEAL |
| JPS58112736A (en) * | 1981-12-26 | 1983-07-05 | 日本マタイ株式会社 | Bag made of composite polyethylene film |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3459831A (en) * | 1965-09-24 | 1969-08-05 | Shell Oil Co | Block copolymer-polyethylene films |
| GB1451607A (en) * | 1972-11-03 | 1976-10-06 | Shell Int Research | Dyeable polymer compositions |
| FR2227284B1 (en) * | 1973-04-26 | 1976-06-11 | Shell Int Research |
-
1975
- 1975-12-06 DE DE19752555078 patent/DE2555078A1/en not_active Withdrawn
-
1976
- 1976-11-12 IT IT29321/76A patent/IT1063995B/en active
- 1976-11-23 NL NL7613046A patent/NL7613046A/en not_active Application Discontinuation
- 1976-11-25 BE BE172687A patent/BE848733A/en unknown
- 1976-11-25 CA CA266,547A patent/CA1081888A/en not_active Expired
- 1976-12-01 FR FR7636186A patent/FR2333827A1/en active Granted
- 1976-12-03 GB GB50479/76A patent/GB1559182A/en not_active Expired
- 1976-12-06 SE SE7613677A patent/SE7613677L/en unknown
- 1976-12-06 JP JP51145702A patent/JPS5269952A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| FR2333827A1 (en) | 1977-07-01 |
| FR2333827B1 (en) | 1981-08-28 |
| DE2555078A1 (en) | 1977-06-08 |
| IT1063995B (en) | 1985-02-18 |
| JPS5269952A (en) | 1977-06-10 |
| BE848733A (en) | 1977-05-25 |
| NL7613046A (en) | 1977-06-08 |
| SE7613677L (en) | 1977-06-07 |
| GB1559182A (en) | 1980-01-16 |
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