Branched polyaryl-sulphone/polycarbonate mixtures and their use for the production of extruded films

• US 4,152,367 A
• Filed: 07/25/1978
• Issued: 05/01/1979
• Est. Priority Date: 08/04/1977
• Status: Expired due to Term

• Current Assignee: Bayer AG
• Original Assignee: Bayer AG
• Inventors: Wank, Joachim, Reese, Eckart, Binsack, Rudolf
• Primary Examiner(s): DeBenedictis, Thomas
• Application Number:
  US05/927,808
• Time in Patent Office: 280 Days
• Field of Search: 260/860, 528/174
• US Class Current: 525/461
• CPC Class Codes: C08L 2666/18 Polyesters or polycarbonates according to C08L67/00 - C08L69/00; Derivatives thereof
• CPC Class Codes: C08L 81/06 Polysulfones; Polyethersulfones

Abstract

The present invention is concerned with mixtures of branched polyaryl-sulphone and aromatic polycarbonates having Mw in excess of about 60,000. These mixtures are particularly suitable for the production of extruded film although the polycarbonate itself is of too high a molecular weight to be conveniently extruded by itself. These films display superior stress-cracking properties and resistance to unsaturated polyester resins compared to similar blends with lower molecular weight polycarbonates.

Claims

1. A polyaryl-sulphone polycarbonate mixture comprising 95% by weight to 30% by weight of a branched polyaryl-sulphone and of 5% by weight to 70% by weight of a polycarbonate with a Mw (weight-average molecular weight) greater than about 60,000.

2. A mixture according to claim 1, in which the Mw of the polycarbonate component is between about 65,000 and 120,000.

3. A mixture according to claim 2, in which the Mw of the polycarbonate component is between about 75,000 and 95,000.

4. A mixture according to claims 1, 2 or 3 which comprises about 90% by weight to 60% by weight of a branched polyaryl-sulphone and about 10% by weight to 40% by weight of said polycarbonate.

5. A mixture according to claim 4 which comprises about 85% by weight to 70% by weight of a polyaryl-sulphone and between about 15% by weight and 30% by weight of said polycarbonate.

6. A process for forming a polyaryl-sulphone/polycarbonate film comprising extruding a mixture as claimed in claim 1, 2 or 3.

7. A polyaryl-sulphone/polycarbonate film when produced by the process of claim 6.