Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
  • C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
  • C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
  • C08G73/1057—Polyimides containing other atoms than carbon, hydrogen, nitrogen or oxygen in the main chain
  • C08G73/106—Polyimides containing other atoms than carbon, hydrogen, nitrogen or oxygen in the main chain containing silicon
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L79/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen or carbon only, not provided for in groups C08L61/00 - C08L77/00
  • C08L79/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
  • C08L79/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors

Definitions

• the present invention relates to polyetherimide homopolymer siloxane polyetherimide copolymer blends, and more particularly relates to siloxane polyetherimide compositions containing a small amount of high melt flow polyetherimide homopolymer.
• U.S. patent application 092,940 filed September 4, 1987; and EP 266595 corresponding to U.S. patent application 925,916 filed November 3, 1986.
• Male, et. al., U.S. patent application 092,940 discloses blends comprising (i) a polyetherimide (ii) a siloxane polyetherimide copolymer and a perfluorocarbon, and discloses that the siloxane polyetherimide copolymer is employed in an impact strength enhancing concentration; for example, from about 2% to about 90% by weight of the blend, and that the perfluorocarbon polymer is employed in a flammability-retarding amount, typically from about 0.2% by weight to 20% by weight of the polymer blend.
• EP 266915 published May 11, 1988 and U.S. patent application 925,916 filed November 3, 1986, disclose blends comprising (i) a polyetherimide and ( ⁇ ) a siloxane polyetherimide copolymer in an impact strength enhancing concentration, for example from about 2% to about 90% by weight of the blend. While the foregoing discloses improving the impact strength of polyetherimide compositions, there is a need to improve the impact strength and tensile elongation of siloxane-polyetherimide copolymer compositions. Accordingly, one object of the present invention is to provide siloxane-polyetherimide compositions exhibiting improved levels of impact strength and tensile elongation.
• the present invention involves polyetherimide- siloxane copolymer compositions containing small amounts of high melt flow polyetherimide homopolymer to improve the impact strength and tensile elongation of the composition.
• the composition is useful as a molding resin for making molded articles, wire coatings and extruded parts.
• the polyetherimide resin has a relatively high melt flow which is preferably at least 15 g/10 min., more preferably between 15 and
• the siloxane polyetherimide copolymers employed in the blends of this invention may be prepared in a manner similar to that used for polyetherimides, except that a portion or all of the organic diamine reactant is replaced by an amine-ter inated organosiloxane of the formula: (I)
• n and m independently are integers from 1 to about 10, preferably from 1 to about 5, most preferably about 3, and g is an integer from 1 to about 40, preferably from about 5 to about 25, and most preferably from 8 to 12.
• siloxane polyetherimide copolymers employed in the compositions of the present invention are referred to as late addition siloxane polyetherimide copolymers which are made by first reacting the organic diamine of formula XII with excess bis(ether anhydride) and to form anhydride terminated oligo ers and then reacting the amine-terminated organosiloxane of formula I.
• the diamine component of the siloxane polyetherimide copolymers generally contains from about 20 to 50 mole % of the amine-terminated organosiloxane of formula I and from about 50 to 80 mole % of the organic diamine of formula XII. In preferred copolymers, the diamine component contains from about 25 to about 40 mole %, most preferably about 35 to 40 mole % of the amine-terminated organosiloxane.
• polyetherimides used for preparing the blends of this invention contain repeating groups of the formula: (II)
• a is an integer greater than 1, e.g., from 10 to 10,000 or more; T is — 0 — or a group of the formula:
• Z is a member of the class consisting of (A):
• X is a member selected from the group consisting of divalent radicals of the formulas:
• R is a divalent organic radical selected from the group consisting of (a) aromatic hydrocarbon radicals having from 6 to about 20 carbon atoms and halogenated derivatives thereof, (b) alkylene radicals having from 2 to about 20 carbon atoms, cycloalkylene radicals having from 3 to about 20 carbon atoms, and (c) divalent radicals of the general formula:
• the polyetherimide may be a copolymer which, in addition to the etheri ide units described above, further contains polyimide repeating units of the formula:
• R is as previously defined and M is selected from the group consisting of:
• polyetherimides can be prepared by any of the methods well known to those skilled in the art, including the reaction of the aromatic bis(ether anhydride) of the formula:
• T and R are defined as described above.
• Bis(ether anhydride)s of formula XI include, for example, 1,3-bis(2,3-dicarboxyphenoxy)benzene dianhydride; 1,4-bis(2,3-dicarboxyphenoxy)benzene dianhydride; 1,3-bis(3,4-dicarboxyphenoxy)benzene dianhydride; and 1,4-bis(3,4-d carboxyphenoxy)benzene dianhydride; 4,4'-bis(phthalic anhydride)ether.
• a preferred class of aromatic bis (ether anhydride)s included by formula XI includes compounds of formula XIII, XIV, and XV, which follow:
• Y is selected from the group consisting of — 0 —, — S —,
• Aromatic bis(ether anhydride)s of formula XIII include, for example:
• Aromatic bis(ether anhydride)s of formul a XIV i ncl ude for example: 2,2-bis(4-(2,3-dicarboxyphenoxy)phenyl)propane di nhydride;
• aromatic bis(ether anhydride)s of formula XV may be, for example,
• a dianhydride such as pyromellitic anhydride
• bis(ether anhydride) is used in combination with the bis(ether anhydride).
• the bis(ether anhydride)s of formula XI are shown in U.S. Patent No. 3,972,902 (Darrell Heath and Joseph Wirth).
• the bis(ether anhydride)s can be prepared by the hydrolysis, followed by dehydration, of the reaction product of a nitrosubstituted pheny! dinitrile with a metal salt of dihydric phenol compound in the presence of a dipolar, aprotic solvent.
• the organic diamines of formula XII include, for example: m-phenylenediamine (MPD), p-phenylenediamine, 4,4'-diaminodipheny1propane,
• N-methyl-bis(3-aminopropyl )amine N-methyl-bis(3-aminopropyl )amine, hexamethylenediamine, heptamethylenediamine, nonamethylenediamine, decamethylenediamine, and mixtures of such diamines.
• Both the polyetherimides and the siloxane polyetherimide copolymers used in the blends of this invention may be prepared by any of the procedures conventionally used for preparing polyetherimides. A presently preferred method of preparation is described in U.S. Patent No. 4,417,044, which is incorporated herein by reference.
• Blending the polyetherimide resin with the polyetherimide-siloxane copolymer in the amounts of the present invention provides a blend which is primarily polyetherimide-siloxane copolymer but which exhibits certain improved properties over either the polyether-siloxane copolymer or polyetherimide resin alone.
• the blends may contain other materials, such as fillers. additives, reinforcing agents, pigments and the like. These blends exhibit very low flammabilities.
• the polyetherimide resin is employed in the present blends in small amounts which enhance the impact strength and tensile elongation of the composition.
• concentration of the polyetherimide homopolymer can range from 1% to 10% by weight based on the total weight of the composition, more preferably from 2.5% to 7.5% by weight thereof, and most preferably from 5% to 7.5% by weight thereof; preferably the polyetherimide-siloxane copolymer is present at a level of from 99.0% to 90% by weight of the composition, more preferably from 97.5% to 92.5% by weight thereof, and most preferably from 92.5% to
• Examples A, B, C, D and E are comparative examples.
• Example A is 100% by weight of a polyetherimidesiloxane copolymer
• Example B is 100% by weight of a polyetherimide.
• Examples 1, 2, 3, 4, 5 and 6 illustrate the enhanced properties obtained by blending a small amount of a relatively high melt flow polyetherimide with a relatively large amount of a late addition polyetherimide- siloxane.
• the amine terminated organosiloxane (ATO) was present at a level of about 40 mole percent based on the total moles of amine terminated organosiloxane and organic diamine.
• the moles of BPADA employed was substantially equal to the combined moles of MPD and ATO.
• PEI for examples for 1 to 4 is a polyetherimide made by reacting BPADA, MPD and having a melt flow value of 20 g/10 min.
• TS Tensile strength in pounds per square inch as determined according to ASTM D638.
• TE Tensile elongation in % as determined according to ASTM D638.
• NI Notched Izod in ft-lb/in as determined according to ASTM D256.
• MI Melt index in g/10 min as determined according to ASTM D1238 modified by using a weight of 6700 grams at a temperature of 343.3°C (650°F).
• the above LA PEI/Si is a late addition polyetherimide siloxane made by first reacting excess BPA dianhydride with meta phenylene diamine to form anhydride terminated oligo ers and then reacting silicone diamine (wherein g is 9) therewith to form late addition polyetherimidesiloxanes.
• the PEI is the reaction product of BPA dianhydride and metaphenylene diamine having an MI of 20 g/10 min.
• Note example -3 provides the highest tensile elongation and notched Izod values.
• the values set forth for example B (Melt Flow between 16 to 20 g/10 min) are not the actual values but are the typical values for the type of PEI employed in examples 1 to 4.
• the PEI/Si was the late addition polyetherimide siloxane of Table 1.
• the PEI's of examples C, 5 and 6 had different melt flow values.
• the PEI's of C, 5 and 6 are made by reacting MPD with BPADA.
• the PEI of E and B is the reaction product of BPADA and MPD.

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• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)

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• 1991
  • 1991-08-27 WO PCT/US1991/006100 patent/WO1993004109A1/en not_active Application Discontinuation
  • 1991-08-27 JP JP91514765A patent/JPH05506475A/ja active Pending
  • 1991-08-27 EP EP91915465A patent/EP0554263A1/de not_active Withdrawn
• 1993
  • 1993-04-26 KR KR1019930701240A patent/KR930702423A/ko not_active Application Discontinuation

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