Hydrostability of polycarbonate polybutylene terephthalate composition

Patent metadata

Field	Value
Publication number	US-10087323-B2
Application number	US-201313950955-A
Country	US
Kind code	B2
Filing date	Jul 25, 2013
Priority date	Jul 30, 2012
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

Disclosed is a process for the manufacture of a modified polyalkylene terephthalate such as modified polybutylene terephthalate. In particular, the process comprises employing a titanium-containing catalyst formed by the reaction product of tetraalkyl titanate and a complexing agent comprising a phosphorous, nitrogen or boron atom. The process is used to prepared modified polyalkylene terephthalates characterized by improved hydrostability, as well as compositions and compositions derived therefrom.

First claim

The invention claimed is:

1. A compounded thermoplastic composition with improved hydrostability, comprising:
31.2 percent by weight of a modified polybutylene terephthalate, wherein the modified polybutylene terephthalate contains phosphoric acid (PA) and 115 ppm of tetraisopropyl titanate (TPT), wherein the molar ratio of TPT to PA (TPT:PA) is 1:0.8;
56.6 percent by weight of a bisphenol A polycarbonate;
2 percent by weight of linear low density polyethylene;
10 percent by weight of methylmethacrylate-butadiene styrene;
0.05 percent by weight of pentaerythritol betalaurylthiopropionate; and
0.08 percent by weight of pentaerythritol-tetrakis(3-(3,5-di-tert-butyl-4-hydroxy-phenyl-) propionate);
wherein all weight percents are based on the total weight of the compounded thermoplastic composition;
the composition is free of transesterification between the polybutylene terephthalate and bisphenol A polycarbonate;
no quencher for the catalyst complex is added to the compounded thermoplastic composition; and
the notched impact strength is maintained at 100 percent after 1000 hours of hydroaging at 80° C. and 80% relative humidity when measured according to ASTM method D256.

Assignees

• Sabic Innovative Plastics Ip Bv
• Sabic Global Technologies Bv

Inventors

• Alidedeoglu Husnu Alp
• Ding Tianhua
• Kannan Ganesh

Classifications

• C08J11/24

  containing hydroxyl groups · CPC title

• C08K3/014

  Stabilisers against oxidation, heat, light or ozone · CPC title

• C08J11/16 Primary

  by treatment with inorganic material (C08J11/14 takes precedence) · CPC title

• C08J2367/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence) · CPC title

• Y02W30/706

  Cross-Sectional Technologies · mapped topic