Method for increasing the adhesion of polydiorganosiloxane-polycarbonate block copolymer interlayers to adjoining laminae and primer composition to accomplish same

• US 4,571,280 A
• Filed: 08/13/1984
• Issued: 02/18/1986
• Est. Priority Date: 08/13/1984
• Status: Expired due to Term

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: LeGrand, Donald G., Olszewski, William V.
• Primary Examiner(s): Gallagher, John J.
• Application Number:
  US06/639,710
• Time in Patent Office: 554 Days
• Field of Search: 156/99, 156/313, 156/329, 428/412, 427/412.1, 524/390
• US Class Current: 156/329
• CPC Class Codes: B32B 27/04 as impregnant, bonding, or embedding substance not used
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/283 comprising polysiloxanes
• CPC Class Codes: B32B 27/365 comprising polycarbonates
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: C08J 5/125 Adhesives in organic diluents
• CPC Class Codes: C09D 183/10 Block or graft copolymers containing polysiloxane sequences obtained by polymerising a compound having a carbon-to-carbon double bond on to a polysiloxane C09D151/08, C09D153/00
• CPC Class Codes: Y10T 428/31507 Of polycarbonate

Abstract

The present invention provides a method and primer composition to increase the adherence of a polydiorganosiloxane-polycarbonate block copolymer lamina or layer to adjoining thermoplastic laminae or layers in a consolidated laminate or composite.

Claims

1. A method for increasing the adhesion of a polydiorganosiloxane-polycarbonate block copolymer lamina or layer to a polycarbonate lamina or layer comprising the steps of:

(a) applying to at least one side of said polycarbonate lamina or layer a primer composition comprising a solution of a polydiorganosiloxane-polycarbonate block copolymer in an organic solvent comprising a C.sub.(3-6) alkanol mixed with either a C.sub.(1-6) halogenated alkyl or a C.sub.(6-9) halogenated phenyl;

(b) evaporating said solvent;

(c) laying-up said polydiorganosiloxane-polycarbonate block copolymer lamina or layer relative to said coated face of said polycarbonate lamina or layer; and

(d) bonding said laid-up laminae or layers to produce a multi-ply composite or laminate.

2. The method according to claim 1 wherein said application step has the further limitation that said primer composition be applied in an amount necessary to provide from about 0.01 g/cm² to about 0.10 g/cm² of said polydiorganosiloxane-polycarbonate block copolymer to said at least one side.