UV curable coating compositions, abrasion resistant UV stabilized thermoplastic composites and method

• US 5,227,240 A
• Filed: 06/22/1992
• Issued: 07/13/1993
• Est. Priority Date: 03/05/1990
• Status: Expired due to Fees

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Miranda, Peter M., Tilley, Mark G.
• Primary Examiner(s): LUSIGNAN, MICHAEL R
• Application Number:
  US07/902,218
• Time in Patent Office: 386 Days
• Field of Search: 156/242, 156/244.17, 156/272.2, 156/273.3, 156/273.5, 427/558, 427/164
• US Class Current: 428/412
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: C08F 220/00 Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
• CPC Class Codes: C08K 5/5397 Phosphine oxides
• CPC Class Codes: C08L 2666/28 Non-macromolecular organic substances
• CPC Class Codes: C09D 183/04 Polysiloxanes
• 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: C09D 4/00 Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
• CPC Class Codes: C09D 7/48 Stabilisers against degradation by oxygen, light or heat
• CPC Class Codes: C09D 7/63 organic
• CPC Class Codes: Y10T 428/31507 Of polycarbonate

Abstract

Organophosphorus compounds capable of being activated with light at from 360 nm to about 410 nm, such as, an acylphosphine oxide, have been found useful as photoinitiators for effecting the cure of various UV curable coating compositions, such as a UV curable organic material in the presence of up to 20% by weight of a UV absorber. UV stabilized thermoplastic composites of films, sheets, or laminates having thickness of up to an inch or more with improved optical clarity also are provided.

Claims

1. A method of coating a thermoplastic substrate comprising applying a UV curable coating composition onto the thermoplastic substrate and thereafter effecting the cure of the UV curable coating composition to produce a coated substrate having superior optical properties and weathering resistance, where the UV curable coating composition comprises by weight,

(A) 100 parts of a UV curable organic material, a UV curable organosilicon material, or a mixture thereof,

(B) 0.3 to 10 parts of an acylphosphorus compound which is effective for polymerizing the UV curable organic coating composition with light having a wavelength of from about 360 nm to about 410 nm and selected from the group consisting of an acylphosphine oxide, an acyl phosphonate and an acylphosphine sulfide, and

(C) 0.5 to 20 parts of a UV absorber,

2. A method in accordance with claim 1, where the thermoplastic substrate is a polycarbonate substrate.

3. A method in accordance with claim 1, where the UV curable coating composition is cured in contact with a rigid smooth surface to impart improved surface characteristics to the resulting article.

5. A thermoplastic composite having superior optical and weathering characteristics made in accordance with the method of claim 1.

6. A thermoplastic laminate having superior optical and weathering characteristics made in accordance with the method of claim 2.

4. A method of making a thermoplastic laminate having improved optical properties and weathering resistance comprising

(a) cold casting a thermoplastic film with a UV curable coating compositing comprising by weight,

(i) 100 parts of a UV curable organic material, a UV curable organosilicon material, or a mixture thereof,

(ii) 0.3 to 10 parts of an acylphosphorus compound which is effective for polymerizing the UV curable organic coating composition with light having a wavelength of from about 360 nm to about 410 nm and selected from the class consisting of an acylphosphine oxide, an acyl phosphonate and an acylphosphine sulfide, and

(iii) 0.5 to 20 parts of a UV absorber.

(b) contacting the resulting coated thermoplastic film to a thermoplastic sheet treated with a UV curable organic adhesive and,

(c) effecting the cure of the UV curable organic adhesive through the thermoplastic sheet.