Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1997-05-30
1998-03-31
Morgan, Kriellion S.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C08K 529
Patent
active
057339597
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/EP95/04577 filed Nov. 21, 1995.
The invention relates to thermoplastic molding compositions comprising
A) from 20 to 99% by weight of a polyester, up to 90% by weight of which may be replaced by a polycarbonate or a polyamide,
B) from 0.1 to 7% by weight of a carbodiimide of the formula I ##STR2## where
R.sup.1 are identical or different radicals selected from the group consisting of --NCO, --NHCONHR.sup.5, --NHCONR.sup.5 R.sup.6 and --NHCOOR.sup.7, where
R.sup.5, R.sup.6 are identical or different and are alkyl, cycloalkyl or aralkyl,
R.sup.7 is the same as R.sup.5 or is alkoxy(poly)oxyalkylene and
R.sup.2, R.sup.3 are identical or different aliphatic radicals having from 1 to 18 carbon atoms or cycloaliphatic radicals having from 5 to 15 carbon atoms or aromatic radicals having from 6 to 15 carbon atoms,
R.sup.4 are identical or different aliphatic radicals having from 2 to 20 carbon atoms or halogen or alkoxy,
x is an integer from 0 to 4 and
n is an integer from 0 to 10,
C) from 0 to 75% by weight of conventional additives and processing aids,
The invention further relates to a method of using the novel molding compositions for producing shaped articles of any type, and to the shaped articles thus obtained.
It is known that polyesters may be protected against decomposition resulting from light or heat by adding organophosphorus compounds, phenolic antioxidants or aliphatic and/or aromatic amines.
U.S. Pat. No. 4,110,302 describes glass-fiber-reinforced mixtures of PBT with an aromatic polycarbodiimide, having improved impact strength. In Example 1, polytolylcarbodiimide is used.
U.S. Pat. No. 4,071,503 discloses mixtures of PBT with an aromatic polycarbodiimide having improved melt strength and solution viscosity. In the example which is given, polytolylcarbodiimide is used.
DE-A 41 08 278 describes PBT for producing fibers with improved thermal and hydrolyric stability, which is stabilized with mono- and/or bifunctional carbodiimides, and also, in the example, with a commercially-available aromatic polycarbodiimide having isopropyl groups on the benzene ring in the ortho position to the carbodiimide group.
BE-A 839 571 describes PBT which has improved melt strength for applications in extrusion and blow molding and is modified with an aromatic polycarbodiimide. In the general description, polycarbodiimides based on tolyl, biphenyl and diphenylmethane are described.
BE-A 846 445 describes fiber-reinforced mixtures according to BE-A 839 571 with improved impact strength for applications in extrusion and blow molding.
EP-A 898 213 describes blends of polyalkyl terephthalate and polycarbonate which are stable to hydrolysis and are stabilized with an aromatic polycarbodiimide of the structure: site in the ortho position to the carbodiimide group carries a substituent.
EP-A 46 04 81 discloses PBT with an aromatic polycarbodiimide according to EP-A 598 213 of the structure site in the ortho position to the carbodiimide group carries a substituent. In the example given, the polycarbodiimide from 1,3,5-triisopropylbenzene-2,4-diisocyanate is used.
JP-A 61/014 251 describes mixtures of PBT and copolymers of olefins with .alpha.,.beta.-unsaturated acids with an aromatic polycarbodiimide. In Example 1, PET is used with addition of poly(1,6-hexamethylene)carbodiimide.
EP-A 411 339 describes copolyesters which contain a stabilizer mixture of a polyquinoline-based antioxidant and an aromatic polycarbodiimide and have improved aging resistance and melt viscosity. In Example 1, poly(1,4-phenylenecarbodiimide) is used.
In the prior art, all of the diamines which are employed in preparing the polycarbodiimides claimed have the amino group bonded in principle directly to an aromatic ring.
EP-A 94 108 216.6 proposes new carbodiimides and their use as stabilizers for polyurethanes.
A disadvantage of polyester molding compositions modified with the polycarbodiimides described is an increased tendency to yellowing, arising from the high aromatic content of the polycarbodiimide. The extreme ste
REFERENCES:
patent: 3776882 (1973-12-01), Witzler et al.
patent: 4071503 (1978-01-01), Thomas et al.
patent: 4987168 (1991-01-01), Kerschbaumer
patent: 5210170 (1993-05-01), Quiring et al.
patent: 5357021 (1994-10-01), Tye et al.
patent: 5498747 (1996-03-01), Pohl et al.
patent: 5504241 (1996-04-01), Pohl et al.
patent: 5597942 (1997-01-01), Pohl et al.
patent: 5621031 (1997-04-01), Leimann et al.
Heitz Thomas
Heym Manfred
Muhlbach Klaus
Plachetta Christoph
BASF - Aktiengesellschaft
Morgan Kriellion S.
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