Process for the production of impact-modified polyalkylene terephthalate/polycarbonate compostions
View Patent ↗A process for the production of impact-modified composition that contains polyalkylene terephthalate and polycarbonate resins is disclosed. The process includes (i) in a first step combining in the melt at 90 to 175° C. glycidyl ester with at least one member selected from the first group consisting of polyalkylene terephthalate and polycarbonate to obtain a molten mixture, said member in powder form, and (ii) in a subsequent step combining the molten mixture with at least one component selected from the second group consisting of polyalkylene terephthalate and polycarbonate to obtain a composition. The composition is characterized in high gloss value.
1. A process for producing an impact-modified polyester/polycarbonate composition, comprising:
(i) combining, at a temperature of from 90 to 175° C., a melt of glycidyl ester with a powder form of at least one member selected from a first group consisting of polyalkylene terephthalate and polycarbonate, thereby obtaining a mixture; and
in a subsequent step, combining the mixture with at least one component selected from a second group consisting of polyalkylene terephthalate and polycarbonate, thereby obtaining the impact-modified polyester/polycarbonate composition.
2. The process of claim 1 wherein the temperature of step (i) is from 100 to 150° C.
3. The process of claim 1 wherein the composition obtained includes
A) 4 to 95 parts by weight of polyalkylene terephthalate,
B) 4 to 95 parts by weight of aromatic polycarbonate,
C) 1 to 30 parts by weight of glycidyl ester, and
D) 0 to 20 parts by weight of conventional additives and processing aids.
4. The process of claim 1 wherein said at least one member of said first group is polyalkylene terephthalate having mean particle size (d 50 ) of 600 to 700 μm.
5. The process of claim 4 wherein said subsequent step is carried out in the melt at 220 to 300° C.
6. The process of claim 3 wherein said member of said first group is polyalkylene terephthalate having a mean particle size (d 50 ) of 600 to 700 μm and wherein said subsequent step is carried out at 220 to 300° C.
7. The process of claim 1 wherein said glycidyl ester conforms to formula (IV)
wherein
R 1 is H or C 1 - to C 6 -alkyl,
R 2 is alkyl or aryl,
a+b+c=100,
a is 50 to 99.5,
b is 0.5 to 25 and
c is 0 to 50.
8. The process of claim 7 , wherein:
a is from 60 to 75;
b is from 6 to 8; and
c is from 20 to 25.
9. The process of claim 3 , wherein the sum of the parts by weight of components A, B, C, and D is 100.
10. The process of claim 3 , wherein component D) is 0.15 to 15 parts by weight.
11. The process of claim 1 wherein the composition obtained contains:
A) 15 to 30 parts by weight of polybutylene terephthalate,
B) 35 to 55 parts by weight of aromatic polycarbonate,
C) 8 to 16 parts by weight of glycidyl ester, and
D) 0.2 to 10 parts by weight of conventional additives and processing aids.
12. The process of claim 1 wherein said member of said first group is polyalkylene terephthalate having mean particle size (d 50 ) of 630 to 640 μm.