Abrasion resistant organopolysiloxane coated polycarbonate article

• US 4,224,378 A
• Filed: 11/01/1978
• Issued: 09/23/1980
• Est. Priority Date: 11/01/1978
• Status: Expired due to Term

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Olson, Daniel R., Schroeter, Siegfried H.
• Primary Examiner(s): Beck, Shrive P.
• Application Number:
  US05/956,810
• Time in Patent Office: 692 Days
• Field of Search: 428/412, 428/447, 428/448, 428/451, 428/500
• US Class Current: 428/412
• CPC Class Codes: C08J 2369/00 Characterised by the use of polycarbonates; Derivatives of polycarbonates
• CPC Class Codes: C08J 2433/06 of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
• CPC Class Codes: C08J 2483/04 Polysiloxanes
• CPC Class Codes: C08J 7/042 with two or more layers, where at least one layer of a composition contains a polymer binder
• CPC Class Codes: C08J 7/043 Improving the adhesiveness of the coatings per se, e.g. forming primers adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50
• CPC Class Codes: C08J 7/046 Forming abrasion-resistant coatings; Forming surface-hardening coatings
• CPC Class Codes: Y10T 428/31507 Of polycarbonate
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane
• CPC Class Codes: Y10T 428/31667 Next to addition polymer from unsaturated monomers, or aldehyde or ketone condensation product
• CPC Class Codes: Y10T 428/31855 Of addition polymer from unsaturated monomers

Abstract

A coated polycarbonate article, and a process for producing said article, having improved abrasion and chemical solvent resistance comprising a polycarbonate substrate having deposited thereon (i) a primer layer comprised of a thermoplastic acrylic polymer; and (ii) a top coat containing a thermoset organopolysiloxane disposed on said primer layer. The process for producing said coated polycarbonate article comprises (i) priming the surface of a polycarbonate substrate with a thermoplastic acrylic polymer by forming a thin film of said thermoplastic acrylic polymer on the surface of said substrate, (ii) applying a top coating composition containing a further curable organopolysiloxane onto the primed substrate, and (iii) curing the further curable organopolysiloxane to form a hard, abrasion and chemical solvent resistant top coat which is tenaciously adhered to the polycarbonate substrate.

Claims

1. A shaped non-opaque coated polycarbonate article having improved mar, scratch, abrasion and chemical solvent resistance comprising a polycarbonate substrate having deposited on the surface thereof (i) an adhesion promoting primer layer consisting essentially of a thermoplastic acrylic polymer;

and (ii) a top coat consisting of a thermoset organopolysiloxane disposed on said primer layer, said top coat being tenaciously and uniformly adhered to said polycarbonate substrate by means of said primer layer.

2. The article of claim 1 wherein said thermoplastic acrylic polymer is the polymerization product of at least one compound represented by the general formula

3. The article of claim 1 wherein said primer layer contains an ultraviolet light absorbent compound.

4. The article of claim 1 wherein said organopolysiloxane is the hydrolysis and condensation product of at least one compound represented by the general formula

5. The article of claim 4 wherein R² is selected from the group consisting of alkyl radicals having from 1 to about 8 carbon atoms, alkenyl radicals having from 2 to about 8 carbon atoms, and a phenyl radical.

6. The article of claim 5 wherein Z represents an --OR³ group wherein R³ is a monovalent hydrocarbon radical and n is 0 or 1.

7. The article of claim 6 wherein R³ is selected from the group consisting of alkyl radicals containing from 1 to about 8 carbon atoms, alkenyl radicals containing from 2 to about 8 carbon atoms, and the phenyl radical.

8. The article of claim 7 wherein R² is a methyl radical, R³ is an ethyl radical, and n is 1.

9. The article of claim 5 wherein Z represents an --OCOR⁴ group wherein R⁴ is a monovalent hydrocarbon radical.

10. The article of claim 9 wherein R⁴ is selected from the group consisting of alkyl radicals containing from 1 to about 8 carbon atoms, alkenyl radicals containing from 2 to about 8 carbon atoms, and the phenyl radical.

11. The article of claim 6 wherein R²_n SiZ.sub.(4-n) is an alkyltrialkoxysilane.

12. The article of claim 1 wherein said primer layer includes an ultraviolet light absorbent compound.

13. The article of claim 11 wherein said primer layer includes an ultraviolet light absorbent compound.

14. A shaped non-opaque coated polycarbonate article having improved mar, scratch, abrasion and chemical solvent resistance comprising a polycarbonate substrate having deposited on at least one surface thereof (i) an adhesion promoting primer layer consisting essentially of (a) a thermoplastic acrylic polymer, and (b) at least one ultraviolet light absorber;

and, (ii) a top coat consisting of a thermoset organopolysiloxane disposed on said primer layer.

15. The article of claim 14 wherein said thermoplastic acrylic polymer is comprised of the polymerization product of at least one compound represented by the general formula

16. A shaped non-opaque coated polycarbonate article having improved mar, scratch, abrasion and chemical solvent resistance comprising a polycarbonate substrate having deposited on at least one surface thereof (i) an adhesion promoting primer layer consisting of a thermoplastic acrylic polymer;

and (ii) a top coat containing a thermoset organopolysiloxane disposed on said primer layer.

17. The article of claim 16 wherein said thermoplastic acrylic polymer is comprised of the polymerization product of at least one compound represented by the general formula

18. A shaped non-opaque coated polycarbonate article having improved mar, scratch, abrasion and chemical solvent resistance comprising a polycarbonate substrate having deposited on at least one surface thereof (i) an adhesion promoting primer layer consisting of (a) a thermoplastic acrylic polymer, and (b) at least one ultraviolet light absorber;

and (ii) a top coat consisting of a thermoset organopolysiloxane disposed on said primer layer.

19. The article of claim 18 wherein said thermoplastic acrylic polymer is comprised of the polymerization product of at least one compound represented by the general formula