Process for preparing thermoplastic composites

• US 4,937,031 A
• Filed: 11/18/1988
• Issued: 06/26/1990
• Est. Priority Date: 11/18/1988
• Status: Expired due to Term

• Current Assignee: Sabic Innovative Plastics IP BV (Government of Saudi Arabia)
• Original Assignee: General Electric Company
• Inventors: Curry, Herbert L.
• Primary Examiner(s): Thurlow, Jeffery
• Assistant Examiner(s): Tentoni, Leo B.
• Application Number:
  US07/273,246
• Time in Patent Office: 585 Days
• Field of Search: 264/171, 264/176.1, 428/412, 428/447
• US Class Current: 264/173.19
• CPC Class Codes: B32B 2369/00 Polycarbonates
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/28 comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
• CPC Class Codes: B32B 27/365 comprising polycarbonates
• CPC Class Codes: B32B 37/153 at least one layer is extruded and immediately laminated while in semi-molten state
• CPC Class Codes: C08L 2666/14 Macromolecular compounds according to C08L59/00 - C08L87/00; Derivatives thereof
• CPC Class Codes: C08L 69/00 Compositions of polycarbonates; Compositions of derivatives of polycarbonates
• CPC Class Codes: C08L 69/005 Polyester-carbonates
• CPC Class Codes: C08L 83/00 Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 83/10 Block- or graft-copolymers containing polysiloxane sequences obtained by polymerising a compound having a carbon-to-carbon double bond on to a polysiloxane C08L51/08, C08L53/00
• CPC Class Codes: Y10T 428/31507 Of polycarbonate
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane

Abstract

Thermoplastic composites of polycarbonate and siloxane-polycarbonate block copolymer layers are produced by a coextrusion process. The composites are useful for the production of high-strength and impact resistant laminate glazing panels.

Claims

1. A process for making a composite of a polycarbonate and a siloxane-polycarbonate block copolymer which comprises coextruding the polycarbonate and the siloxane-polycarbonate block copolymer.

2. A process of claim 1 further comprising adjusting melt flow rates of the polycarbonate and the siloxane-polycarbonate block copolymer to substantially equal values prior to the coextruding step.

3. A process of claim 1 or 2 wherein said siloxane-polycarbonate block copolymer is a compound of the general formula ##STR6## where n is at least 1, inclusive, b is equal to from 1 to about 200, inclusive, c is equal to from about 5 to about 200, inclusive, the ratio of b to c being from about 0.05 to about 3, d is at least 1, B is ##STR7## where T is member selected from the group consisting of hydrogen and ##STR8## R₁ is a member selected from the group consisting of hydrogen, monovalent hydrogen radicals and halogenated monovalent hydrocarbon radicals, R₂ is a member selected from the group consisting of monovalent hydrocarbon radicals, halogenated monovalent hydrocarbon radicals and cyanoalkyl radicals, R₃ is a member selected from the group consisting of monovalent hydrocarbon radicals and halogenated hydrocarbon radicals, and Y is a member selected from the group consisting of hydrogen, lower alkyl radicals and halogen radicals and mixtures thereof.

4. A process of claim 3 wherein n is an integer equal to from 1 to about 1000.

5. A process of claim 3 wherein c has an average value from about 15 to about 90 inclusive and the ratio of b to c is from about 0.067 to about 0.45 inclusive.

6. A process of claim 1 or 2 wherein said polycarbonate is extruded at a temperature from about 475°

F. to 530°

F.

7. A process of claim 1 or 2 wherein said siloxane-polycarbonate block copolymer is extruded at a temperature from about 450°

F. to about 500°

F.

8. A process of claim 1 or 2 wherein the polycarbonate is coextruded into a layer having a thickness selected from between about 0.05 and 0.25 inches and the siloxane-polycarbonate block copolymer is coextruded into a layer having a thickness selected from between about 0.005 and about 0.1 inches.

9. A process of claim 1 or 2 wherein the polycarbonate is coextruded into a layer having a thickness selected from between about 0.1 and 0.2 inches and the siloxane-polycarbonate block copolymer is coextruded into a layer having a thickness selected from between about 0.01 and 0.05 inches.

10. A process of claim 1 wherein the composite consists essentially of a polycarbonate layer with a siloxane-polycarbonate block copolymer layer disposed on one side thereof.

11. A process of claim 1 wherein the composite consists essentially of a polycarbonate layer with a siloxane-polycarbonate block copolymer layer on each side thereof.

12. A process of claim 3 wherein R₁ is methyl.

13. A process of claim 3 wherein R₂ is methyl.

14. A process of claim 3 wherein Y is hydrogen.