Transparent polycarbonate PET blends

Details Transparent polycarbonate PET blends Transparent polycarbonate PET blends

1994-04-12

1994-12-27

Buttner, David

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525462, 525469, C08L 6900, C08L 6702

Patent

active

053767365

ABSTRACT:
Thermoplastic molding compositions are disclosed containing (i) about 1 to 89% polyethylene terephthalate (ii) about 10 to 89% of a first aromatic polycarbonate (PC1) and (iii) about 1-89% of the second aromatic polycarbonate (PC2). PC2 is a copolycarbonate which contains about 5 to 70 mole percent of structural units derived from a dihydroxy compound the bridging unit of which corresponds to ##STR1## wherein R.sup.3 and R.sup.4 X and m are defined. A composition of the invention is characterized in a TLT value which is an improvement over that of the corresponding composition which contains the same amount of PET and only PC1. An additional embodiment of the invention concerns a method for increasing the TLT of a thermoplastic molding composition containing PET and PC1. The method comprises replacing some of said PC1 by PC2.

REFERENCES:
patent: 5104723 (1992-04-01), Freitag et al.
patent: 5132154 (1992-07-01), Westeppe et al.

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