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1. WO1993019127 - MELANGES DE COPOLYMERES DE POLYESTER ET D'ETHYLENE PRESENTANT UNE RESISTANCE ELEVEE A LA FLEXION PAR CHOC

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

WHAT IS CLAIMED IS:
1. A thermoplastic molding composition
comprising:
(A) 60 to 85 weight percent of a polyester which comprises
(1) a dicarboxylic acid component consisting essentially of repeat units from terephthalic acid, and

(2) a diol component consisting essentially of repeat units from 15 to 100 mole percent
1,4—cyclohexanedimethanol and from 0 to 85 mole percent ethylene glycol, based on 100 mole percent dicarboxylic acid and 100 mole percent diol, said polyester having an inherent viscosity of 0.4 to 1.5 dl/g; and
(B) 15 to 40 weight percent of an ethylene copolymer containing repeat units from ethylene and at least 5 mole percent of a free radical polymerizable comonomer selected from the group consisting of vinyl acetate and an alkyl acrylate of the formula

H2C=C-C ^%-00R2

wherein
R1 is hydrogen or a methyl radical, and
R2 is a monovalent hydrocarbon radical having from 1 to

8 carbon atoms;
it being understood that the combined weights of (A) and (B) total 100 percent.

2. A thermoplastic molding composition
comprising:
(A) 60 to 85 weight percent of a polyester which comprises
(1) a dicarboxylic acid component consisting essentially of repeat units from terephthalic acid, and (2) a diol component consisting essentially of repeat units from 15 to 99.5 mole percent
1, 4—cyclohexanedimethanol and from 0.5 to 85 mole percent ethylene glycol, based on 100 mole percent dicarboxylic acid and 100 mole percent diol, said polyester having an inherent viscosity of 0.4 to 1.5 dl/g; and
(B) 15 to 40 weight percent of an ethylene
copolymer containing repeat units from ethylene and at least 5 mole percent of a free radical polymerizable comonomer selected from the group consisting of vinyl acetate and an alkyl acrylate of the formula


wherein
R1 is hydrogen or a methyl radical, and
R2 is a monovalent hydrocarbon radical having from 1 to 8 carbon atoms;
it being understood that the combined weights of (A) and (B) total 100 percent.

3. The composition according to Claim 1 wherein the polyester, component (A) , has an inherent viscosity of 0.5 to 1.1 dl/g, wherein the inherent viscosity is determined at 25°C. in 60/40 (wt./wt.)
phenol/tetrachloroethane at a concentration of
0.5 g/100 ml.

4. The composition according to Claim 1 wherein the ethylene copolymer, component (B) , has a Stiffness value of less than 68.9 MPa as determined by ASTM D747, and a Melt Index of 1 to 100 measured at 190°C, as determined by ASTM-D1238.

5. The composition according to Claim 1 wherein component (A) is present in an amount of from 65 to 79 weight percent and component (B) is present in an amount of from 21 to 35 weight percent based on the total weight of the composition.

6. The composition according to Claim 1 wherein the polyester, component (A) , has an acid component of 100 mole percent from terephthalic acid; and has a diol component of 65 to 75 mole percent from ethylene glycol and 25 to 35 mole percent from 1,4—cylohexanedimethanol.

7. The composition according to Claim 1 wherein the polyester, component (A) , has an acid component of 100 mole percent from terephthalic acid; and has a diol component of 30 to 40 mole percent from ethylene glycol and 60 to 70 mole percent from 1,4—cylohexanedimethanol.

8. The composition according to Claim 1, further comprising an additive selected from the group
consisting of colorants, mold release agents,
antioxidants, tougheners, nucleating agents, ultraviolet light and heat stabilizers, lubricants, and processing aids.

9. A molded article comprising the composition of Claim 1.

10. A molded article comprising the composition of Claim 2.

11. A process for preparing a thermoplastic molding composition having improved high notched Izod impact strength at a temperature near 0°C. , said process comprising the steps of:
(I) substantially homogeneously blending
(A) 60 to 85 weight percent of a polyester which comprises
(1) a dicarboxylic acid component consisting essentially of repeat units from terephthalic acid, and

(2) a diol component consisting essentially of repeat units from 15 to 100 mole percent
1,4—cyclohexanedimethanol and from 0 to 85 mole percent ethylene glycol, based on 100 mole percent dicarboxylic acid and 100 mole percent diol, said polyester having an inherent viscosity of 0.4 to 1.5 dl/g; and
(B) 15 to 40 weight percent of an ethylene
copolymer containing repeat units from ethylene and at least 5 mole percent of a free radical polymerizable comonomer selected from the group consisting of vinyl acetate and an alkyl acrylate of the formula


wherein
R1 is hydrogen or a methyl radical, and
R2 is a monovalent hydrocarbon radical having from 1 to

8 carbon atoms;
it being understood that the combined weights of (A) and (B) total 100 percent; and
(II) injection molding said blend at melt temperatures of 250°C. to 325°C. into molds held at a temperature of

0°C. to 90°C.

12. The product of the process of Claim 11.