CA2051645A1 - Impact resistant polymer blends - Google Patents
Impact resistant polymer blendsInfo
- Publication number
- CA2051645A1 CA2051645A1 CA002051645A CA2051645A CA2051645A1 CA 2051645 A1 CA2051645 A1 CA 2051645A1 CA 002051645 A CA002051645 A CA 002051645A CA 2051645 A CA2051645 A CA 2051645A CA 2051645 A1 CA2051645 A1 CA 2051645A1
- Authority
- CA
- Canada
- Prior art keywords
- polymer blend
- mol
- ethylene glycol
- consisting essentially
- repeat units
- 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.)
- Abandoned
Links
Classifications
-
- 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
-
- 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
Abstract
Disclosed is a polymer blend having improved low-temperature impact strength comprising a copolyester of terephthalic acid, ethylene glycol and 1,4-cyclohexanedimethanol, and a styrene-butadiene block copolymer.
Description
WO90/151~ 2~ PCT/~S90/03022 IMPACT RESISTANT POLYMER BLENDS
Technical Field This invention relates to blends of styrene-butadiene copolymers with certain terephthalic acidbased polyesters which have improved low-temperature impact strengths. These blends are useful as molding compositions.
Backqround of the Invention There is a need for tough, inexpensive thermoplastics that can be injection molded for use in applications such as household items. Styrene-butadiene copolymers and polyesters of terephthalic acid and ethylene glycol or copolyesters of terephthalic acid, ethylene glycol, and cyclohexanedimethanol meet most of these requirements, but have low impact strengths, especially at low temperatures. It has now been discovered that blends of styrene-butadiene copolymers with the above polyesters or copolyesters have unexpectedly high low-temperature impact strengths while - maintaining other physical properties.
U.S. Patent No. 4,582,876 dated April 15, 1986 by D. A. Weemes and R. W. Seymour of Eastman Kodak describes blends of copolyesters and styxene-butadiene-maleic anhydride copolymers that have high impact at low temperatures. That disclosure did not make the present discovery obvious, however, since that styrenic polymer had rubbery inclusions that were believed to cause the high impact strengths of the blends. The morphology of the styrene-butadiene copolymer of the present invention is not similar to that disclosed in the '876 patent and was not expected to result in high impact strengths when blended with polyesters.
" ' ~' ~: ::; , i .
WO90/15~ PCT/US90/030 ~ fl ~ 2 -Also of interest are U.S. Patents No. 4,117,034;
3,644,574; 4,352,907i 3,564,077i 4,096,202, 3,919,353;
German Patent No. 3,332,325 and Japanese Patent No~ 5371155.
Description of the Invention According to the present invention there are provided polymer blends which have improved low-temperature impact strengths comprising (a) 20-95 wt ~ of a polyester having an I.V. of 0.5-1.0 dl/g and containing repeat units from an acid component of at least 80 mol % terephthalic acid, and a glycol component of 25-100 mol %
ethylene glycol and 75-0 mol % 1,4-cyclohexane-15 dimethanol, and (b) 80-5 wt % of a styrene--butadiene block copolymer containing 10-40 wt ~ repeat unit.s from butadiene, said copolymer having a flow rate of 6-12 g/10 min.
The polyester or copolyester (herein sometimes collectively referred to as "polyester"~ used in the present invention may be a polyester based substantially on ethylene glycol and terephthalic acid monomer units or may be copolymers having up to 75 mol % monomer units from 1,4-cyclohexanedimethanol. Minor amounts (up to 10 mol %) of other comonomers may also be used. If comonomers are used, preferred comonomers include isophthalic acid, naphthalenedicarboxylic acid, cycIohexanedicarboxylic acid, succinic acid, sebacic acid, adipic acid, ethylene glycol, diethylene glycol, butanediol, hexanediol, ~nd neopentyl glycol, fo example.
The polyester used in the present invention preferably has an inherent viscosity which is greater than 0.5, preferably 0.5-1.0 and most preferably, 0.7-0.8 dl/g. The polyesters may be made by -: . .~
conventional, well known techni~ues, and many are commercially available.
The styrene-butadiene block copolymers useful in the blends of this invention are those having repeat units from 10-40 wt % butadiene and 90-60 wt %
styrene, and a melt flow rate of 6-12 g/10 min. Such copolymers may be produced using conventional copolymerization processes, and many are commercially available such as, for example, KR03 K-Resin (trademark) from Phillips.
The blends can be melt blended and injection molded on conventional processing equipment. The resulting parts have unexpectedly good low- -temperature impact strengths and good tensile strength, ductility, flexural properties, and heat distortion temperatures. For the blends described here, all ratios of the components have higher O~C
notched Izod impact values than do either of the neat components. These blends are useful as injection molded articles with good toughness and ductility.
The following examples are submitted for a better understanding of the invention. In the examples, KR03 K-Resin, a styrene-butadiene block copolymer ~SB copolymer) having repeat units from 20 wt % butadiene and 30 wt % styrene, having a melt ~low rate of 8 is used. Polyester A is a polyester having repeat units from terephthalic acid and ethylene glycol having an I.V. of 0.705.
Copolyester B is a copolyester having repeat units from terephthalic acid, 30 mol % 1,4-cyclohexane-dimethanol and 70 mol % ethylene glycol, having an I.V. o 0.75 and Copolyester C is a copolyester of terephthalic acid, 70 mol % 1,4-cyclohexanedimethanol and 30 mol % ethylene glycol.
The blends contain 25, 50, and 75 wt % K-Resin.
They are melt-compounded on a twin-screw Werner &
Pfleiderer extruder and injection molded on a Boy 22S
~''-?~ ' .
WO90/~51~ PCT/VSgO/03022 machine at 240-~60C. The mechanical properties are shown in Tables 1-3. The 0C notched Izods are shown in Figures 1-3. In each case, the 0C notched Izod impact strength of the blends are unexpectedly higher than the impact strengths of either of the neat components.
These remarkable impact strengths of the blends are clearly achie~ed while maintaining good tensile and flexural properties.
In the table, t.he letters C, P and N under impact strengths have the following meanings:
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The tests used herein for determination of mechanical properties are described as follows:
Melt Flow Rate or Index ASTM Dl238-79 Tensile Strength ASTM D638-80 at Fracture Elongation at Fracture ASTM D63B-80 Flexural Modulus ASTM D790-80 FlexuIal Strength ASTM D790-80 Izod Impact ASTM D256-8l Heat Deflection ASTM D648-72 Temperature, C
~ nless otherwise specified, all parts, percentages, ratios, etc., are by weight. Weight of reinforcing glass fibers and nucleating agent(s) are based on total composition weight.
The invention has been described in detail with particular reference to pre~erred embodiments thereof, but it will be understood that ~ariations and modifications can be effected within the spirit and scope of the invention.
.
Technical Field This invention relates to blends of styrene-butadiene copolymers with certain terephthalic acidbased polyesters which have improved low-temperature impact strengths. These blends are useful as molding compositions.
Backqround of the Invention There is a need for tough, inexpensive thermoplastics that can be injection molded for use in applications such as household items. Styrene-butadiene copolymers and polyesters of terephthalic acid and ethylene glycol or copolyesters of terephthalic acid, ethylene glycol, and cyclohexanedimethanol meet most of these requirements, but have low impact strengths, especially at low temperatures. It has now been discovered that blends of styrene-butadiene copolymers with the above polyesters or copolyesters have unexpectedly high low-temperature impact strengths while - maintaining other physical properties.
U.S. Patent No. 4,582,876 dated April 15, 1986 by D. A. Weemes and R. W. Seymour of Eastman Kodak describes blends of copolyesters and styxene-butadiene-maleic anhydride copolymers that have high impact at low temperatures. That disclosure did not make the present discovery obvious, however, since that styrenic polymer had rubbery inclusions that were believed to cause the high impact strengths of the blends. The morphology of the styrene-butadiene copolymer of the present invention is not similar to that disclosed in the '876 patent and was not expected to result in high impact strengths when blended with polyesters.
" ' ~' ~: ::; , i .
WO90/15~ PCT/US90/030 ~ fl ~ 2 -Also of interest are U.S. Patents No. 4,117,034;
3,644,574; 4,352,907i 3,564,077i 4,096,202, 3,919,353;
German Patent No. 3,332,325 and Japanese Patent No~ 5371155.
Description of the Invention According to the present invention there are provided polymer blends which have improved low-temperature impact strengths comprising (a) 20-95 wt ~ of a polyester having an I.V. of 0.5-1.0 dl/g and containing repeat units from an acid component of at least 80 mol % terephthalic acid, and a glycol component of 25-100 mol %
ethylene glycol and 75-0 mol % 1,4-cyclohexane-15 dimethanol, and (b) 80-5 wt % of a styrene--butadiene block copolymer containing 10-40 wt ~ repeat unit.s from butadiene, said copolymer having a flow rate of 6-12 g/10 min.
The polyester or copolyester (herein sometimes collectively referred to as "polyester"~ used in the present invention may be a polyester based substantially on ethylene glycol and terephthalic acid monomer units or may be copolymers having up to 75 mol % monomer units from 1,4-cyclohexanedimethanol. Minor amounts (up to 10 mol %) of other comonomers may also be used. If comonomers are used, preferred comonomers include isophthalic acid, naphthalenedicarboxylic acid, cycIohexanedicarboxylic acid, succinic acid, sebacic acid, adipic acid, ethylene glycol, diethylene glycol, butanediol, hexanediol, ~nd neopentyl glycol, fo example.
The polyester used in the present invention preferably has an inherent viscosity which is greater than 0.5, preferably 0.5-1.0 and most preferably, 0.7-0.8 dl/g. The polyesters may be made by -: . .~
conventional, well known techni~ues, and many are commercially available.
The styrene-butadiene block copolymers useful in the blends of this invention are those having repeat units from 10-40 wt % butadiene and 90-60 wt %
styrene, and a melt flow rate of 6-12 g/10 min. Such copolymers may be produced using conventional copolymerization processes, and many are commercially available such as, for example, KR03 K-Resin (trademark) from Phillips.
The blends can be melt blended and injection molded on conventional processing equipment. The resulting parts have unexpectedly good low- -temperature impact strengths and good tensile strength, ductility, flexural properties, and heat distortion temperatures. For the blends described here, all ratios of the components have higher O~C
notched Izod impact values than do either of the neat components. These blends are useful as injection molded articles with good toughness and ductility.
The following examples are submitted for a better understanding of the invention. In the examples, KR03 K-Resin, a styrene-butadiene block copolymer ~SB copolymer) having repeat units from 20 wt % butadiene and 30 wt % styrene, having a melt ~low rate of 8 is used. Polyester A is a polyester having repeat units from terephthalic acid and ethylene glycol having an I.V. of 0.705.
Copolyester B is a copolyester having repeat units from terephthalic acid, 30 mol % 1,4-cyclohexane-dimethanol and 70 mol % ethylene glycol, having an I.V. o 0.75 and Copolyester C is a copolyester of terephthalic acid, 70 mol % 1,4-cyclohexanedimethanol and 30 mol % ethylene glycol.
The blends contain 25, 50, and 75 wt % K-Resin.
They are melt-compounded on a twin-screw Werner &
Pfleiderer extruder and injection molded on a Boy 22S
~''-?~ ' .
WO90/~51~ PCT/VSgO/03022 machine at 240-~60C. The mechanical properties are shown in Tables 1-3. The 0C notched Izods are shown in Figures 1-3. In each case, the 0C notched Izod impact strength of the blends are unexpectedly higher than the impact strengths of either of the neat components.
These remarkable impact strengths of the blends are clearly achie~ed while maintaining good tensile and flexural properties.
In the table, t.he letters C, P and N under impact strengths have the following meanings:
C - complete break P - partial break N - no break .. . . . -., - -. . . . - : ..
. ~: . . . . . . :: . . ,: . . , ~
,. . - , . ; , . . ' "~: .;.: : .: ' : , :: ;. . .: .
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WO90/15104 P~T/US90~03022 2 ~
The tests used herein for determination of mechanical properties are described as follows:
Melt Flow Rate or Index ASTM Dl238-79 Tensile Strength ASTM D638-80 at Fracture Elongation at Fracture ASTM D63B-80 Flexural Modulus ASTM D790-80 FlexuIal Strength ASTM D790-80 Izod Impact ASTM D256-8l Heat Deflection ASTM D648-72 Temperature, C
~ nless otherwise specified, all parts, percentages, ratios, etc., are by weight. Weight of reinforcing glass fibers and nucleating agent(s) are based on total composition weight.
The invention has been described in detail with particular reference to pre~erred embodiments thereof, but it will be understood that ~ariations and modifications can be effected within the spirit and scope of the invention.
.
Claims (3)
- Claim 1.
5. A molded article comprising the polymer blend of - Claim 2.
6. A molded article comprising the polymer blend of - Claim 3.
repeat units from butadiene, said copolymer having a melt flow rate of 6-12 g/10 min.
2. The polymer blend according to Claim 1 wherein said polyester has repeat units from an acid component consisting essentially of terephthalic acid and a glycol component consisting essentially of ethylene glycol.
3. The polymer blend according to Claim 1 wherein said polyester has repeat units from an acid component consisting essentially of terephthalic acid and a glycol component consisting essentially of ethylene glycol and 1,4-cyclohexanedimethanol.
4. A molded article comprising the polymer blend of
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US36146889A | 1989-06-05 | 1989-06-05 | |
| US361,468 | 1989-06-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2051645A1 true CA2051645A1 (en) | 1990-12-06 |
Family
ID=23422182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002051645A Abandoned CA2051645A1 (en) | 1989-06-05 | 1990-05-30 | Impact resistant polymer blends |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5041499A (en) |
| EP (2) | EP0402279A1 (en) |
| JP (1) | JPH04505936A (en) |
| KR (1) | KR920701355A (en) |
| CA (1) | CA2051645A1 (en) |
| DK (1) | DK0402279T3 (en) |
| WO (1) | WO1990015104A2 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5276151A (en) * | 1990-02-01 | 1994-01-04 | Emory University | Method of synthesis of 1,3-dioxolane nucleosides |
| US5914331A (en) * | 1990-02-01 | 1999-06-22 | Emory University | Antiviral activity and resolution of 2-hydroxymethyl-5-(5-fluorocytosin-1-yl)-1,3-oxathiolane |
| US5393837A (en) * | 1993-01-21 | 1995-02-28 | Kuraray Company Ltd. | Polyester composition and process for producing the same |
| CA2166637C (en) * | 1995-01-11 | 2000-11-07 | Mark D. Hanes | Blends of poly(ethylene terephthalate) and monovinyl/conjugated diene block copolymers |
| US5654097A (en) * | 1995-10-26 | 1997-08-05 | Hoechst Celanese Corp. | Heterofilament and fused cord thereof |
| JPH09324113A (en) * | 1996-06-07 | 1997-12-16 | Polyplastics Co | Thermoplastic polyester resin composition |
| JPH11189708A (en) * | 1997-12-26 | 1999-07-13 | Tsutsunaka Plast Ind Co Ltd | Resin composition for card |
| MXPA01009888A (en) | 1999-03-29 | 2003-07-21 | Iaf Biochem Int | Methods of treating leukemia. |
| EP1510551B1 (en) * | 2003-08-14 | 2008-04-16 | Basf Se | Blend of polyester and block copolymers of monovinylaromatic monomer and conjugated diene |
| US8574694B2 (en) | 2009-11-03 | 2013-11-05 | Curwood, Inc. | Packaging sheet with improved cutting properties |
| US20110104342A1 (en) * | 2009-11-03 | 2011-05-05 | Kevin David Glaser | Chlorine-Free Packaging Sheet with Tear-Resistance Properties |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1694173A1 (en) * | 1967-07-22 | 1971-06-09 | Hoechst Ag | Thermoplastic polyester molding compounds |
| AT295860B (en) * | 1969-06-02 | 1972-01-25 | Sandoz Ag | Polymer mixture of polyethylene terephthalate and butadiene-styrene copolymer and process for their production |
| US3644574A (en) * | 1969-07-17 | 1972-02-22 | Eastman Kodak Co | Shaped articles of blends of polyesters and polyvinyls |
| IT963692B (en) * | 1972-08-03 | 1974-01-21 | Montedison Spa | SHOCK-RESISTANT POLYESTERS |
| CA1062390A (en) * | 1975-08-11 | 1979-09-11 | William Steffancin | Amorphous polyester graft polymer alloys |
| US4096202A (en) * | 1976-06-09 | 1978-06-20 | Rohm And Haas Company | Impact modified poly(alkylene terephthalates) |
| JPS5371155A (en) * | 1976-12-07 | 1978-06-24 | Sumitomo Chem Co Ltd | Polyester resin composition having high impact strength |
| US4301255A (en) * | 1979-07-05 | 1981-11-17 | Permacel | Novel alloy compositions and products |
| US4349469A (en) * | 1981-02-17 | 1982-09-14 | Eastman Kodak Company | Copolyesterethers |
| US4352907A (en) * | 1981-02-17 | 1982-10-05 | Plastics Engineering Company | Polyethyleneterephthalate ternary blends |
| EP0262691B1 (en) * | 1981-08-13 | 1992-12-02 | Asahi Kasei Kogyo Kabushiki Kaisha | A modified block copolymer |
| US4485204A (en) * | 1981-08-26 | 1984-11-27 | Phillips Petroleum Company | Polyester blends comprising a desiccant and a rubbery block copolymer |
| DE3332325A1 (en) * | 1983-09-08 | 1985-03-28 | Basf Ag, 6700 Ludwigshafen | Thermoplastic moulding composition |
| US4582876A (en) * | 1984-09-10 | 1986-04-15 | Eastman Kodak Company | High-impact polyester/styrene-maleic anhydride copolymer blends |
| JPH0635155B2 (en) * | 1985-11-26 | 1994-05-11 | 旭化成工業株式会社 | Hard shrinkable film |
-
1990
- 1990-05-30 CA CA002051645A patent/CA2051645A1/en not_active Abandoned
- 1990-05-30 KR KR1019910701761A patent/KR920701355A/en not_active Application Discontinuation
- 1990-05-30 EP EP90420257A patent/EP0402279A1/en not_active Withdrawn
- 1990-05-30 WO PCT/US1990/003022 patent/WO1990015104A2/en not_active Application Discontinuation
- 1990-05-30 JP JP2508554A patent/JPH04505936A/en active Pending
- 1990-05-30 DK DK90420257.9T patent/DK0402279T3/en active
- 1990-05-30 EP EP90909006A patent/EP0476008A1/en active Pending
- 1990-11-09 US US07/611,246 patent/US5041499A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| WO1990015104A3 (en) | 1991-01-24 |
| WO1990015104A2 (en) | 1990-12-13 |
| KR920701355A (en) | 1992-08-11 |
| JPH04505936A (en) | 1992-10-15 |
| EP0402279A1 (en) | 1990-12-12 |
| DK0402279T3 (en) | 1990-12-12 |
| EP0476008A1 (en) | 1992-03-25 |
| US5041499A (en) | 1991-08-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |