Blends of polypropylene, polycarbonate and a saturated styrene-ethylene-butylene-styrene rubber

• US 4,568,723 A
• Filed: 11/08/1984
• Issued: 02/04/1986
• Est. Priority Date: 11/08/1984
• Status: Expired due to Fees

• Current Assignee: Mobil Oil Corporation (Exxon Mobil Corporation)
• Original Assignee: Mobil Oil Company (Exxon Mobil Corporation)
• Inventors: Lu, Pang-Chia
• Primary Examiner(s): Pertilla, Theodore E.
• Application Number:
  US06/669,542
• Time in Patent Office: 453 Days
• Field of Search: 525/92, 525/146, 525/468, 525/901
• US Class Current: 525/92.00E
• CPC Class Codes: C08L 2205/03 containing three or more polymers in a blend
• CPC Class Codes: C08L 23/12 Polypropene
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 2666/18 Polyesters or polycarbonates according to C08L67/00 - C08L69/00; Derivatives thereof
• CPC Class Codes: C08L 2666/24 Graft or block copolymers according to groups C08L51/00, C08L53/00 or C08L55/02; Derivatives thereof
• CPC Class Codes: C08L 53/00 Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 53/02 of vinyl-aromatic monomers and conjugated dienes
• CPC Class Codes: C08L 69/00 Compositions of polycarbonates; Compositions of derivatives of polycarbonates

Abstract

A composition suitable for melt extrusion in film form comprising an intimate thermoplastic blend of: polypropylene, polycarbonate, and a saturated block copolymer of styrene-ethylene-butylene-styrene.

Claims

1. A composition suitable for melt extrusion in film form comprising an intimate blend of from about 50-98.5 wt. % of polypropylene, from about 1-40 wt. % of a polycarbonate and from about 0.5-10 wt. % of a saturated block copolymer of styrene-ethylene-butylene-styrene, wherein said copolymer has about 13-37 mole % styrene, and the remainder equal mole % proportions of ethylene and butylene.

2. The composition of claim 1 having the approximate proportions of 82 wt. % polypropylene, 15 wt. % polycarbonate and 3 wt. % styrene-ethylene-butylene-styrene copolymer.

3. The composition of claim 1 in film form.

4. The composition of claim 1 in unoriented film form.

5. The composition of claim 1 in which said polypropylene is a highly crystalline polypropylene and said polycarbonate is poly(2,2-diphenyl propane)-carbonate.