Acrylic coated thermoplastic substrate

• US 5,258,225 A
• Filed: 02/16/1990
• Issued: 11/02/1993
• Est. Priority Date: 02/16/1990
• Status: Expired due to Term

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Katsamberis, Dimitris
• Primary Examiner(s): Sluby, P. C.
• Application Number:
  US07/481,526
• Time in Patent Office: 1,355 Days
• Field of Search: 428/412, 428/423.7, 428/483, 428/331, 428/908.8, 428/913, 428/446, 428/448, 428/451, 428/520, 428/522
• US Class Current: 428/331
• CPC Class Codes: C08F 222/1006 of polyhydric alcohols or polyhydric phenols
• CPC Class Codes: C08J 2433/00 Characterised by the use of homopolymers or 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 of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
• CPC Class Codes: C08J 2483/00 Characterised by the use 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; Derivatives of such polymers
• CPC Class Codes: C08J 7/0427 with only one layer of a composition containing a polymer binder with more layers C08J7/042
• CPC Class Codes: C08J 7/046 Forming abrasion-resistant coatings; Forming surface-hardening coatings
• CPC Class Codes: C08L 2666/54 Inorganic substances
• CPC Class Codes: C09D 175/16 having terminal carbon-to-carbon unsaturated bonds
• 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: Y10S 428/913 Material designed to be responsive to temperature, light, moisture
• CPC Class Codes: Y10T 428/259 Silicic material
• CPC Class Codes: Y10T 428/31507 Of polycarbonate
• CPC Class Codes: Y10T 428/31565 Next to polyester [polyethylene terephthalate, etc.]
• CPC Class Codes: Y10T 428/31667 Next to addition polymer from unsaturated monomers, or aldehyde or ketone condensation product
• CPC Class Codes: Y10T 428/31797 Next to addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31928 Ester, halide or nitrile of addition polymer
• CPC Class Codes: Y10T 428/31935 Ester, halide or nitrile of addition polymer

Abstract

An ultraviolet radiation curable silica coating composition containing (a) acrylic monomers, (b) functionalized colloidal silica, (c) acrylated urethanes, (d) an ultraviolet radiation absorber, and (e) a photoinitiator. The coating composition once applied to and cured on a thermoplastic substrate provides a coating which exhibits improved flexibility and weathering. The coatings are useful for providing abrasion resistance and weatherability to thermoplastic, for example polycarbonate, substrates.

Claims

1. A coated thermoplastic article having an abrasion resistant coating adhered to a thermoplastic substrate, the coating being the ultraviolet radiation cured reaction products of a solventless composition comprising:

(a) from 10 percent by weight to 60 percent by weight based on the total weight of the coating composition of a multifunctional acrylate ester monomer;

(b) from 20 percent by weight to 40 percent by weight based on the total weight of the coating composition of an acrylate functionalized colloidal silica;

(c) from 5 percent by weight to 40 percent by weight based on the total weight of the coating composition of a multifunctional acrylated aliphatic urethane;

(d) from 5 percent dry weight to 10 percent by weight based on the total weight of the coating composition of an ultraviolet radiation absorber; and

(d) from 1 percent by weight to 5 percent by weight based on the total weight of the coating composition of a photoinitiator.

2. The article of claim 1 wherein said multifunctional acrylate ester monomer is hexanedioldiacrylate.

3. The article of claim 1 wherein said multifunctional acrylated aliphatic urethane is a difunctional aliphatic acrylated urethane.

4. The article of claim 1 wherein said acrylate functionalized colloidal silica is a methacrylate functionalized colloidal silica, and said thermoplastic substrate is an aromatic polycarbonate resin substrate.

5. The article of claim 1 wherein said absorber is a benzene sulfonate ester of a benzotriazole.

6. The article of claim 1 wherein said photoinitiator is diethoxyacetophenone.

7. The coated thermoplastic article of claim 1 wherein said thermoplastic substrate is an aromatic polycarbonate resin substrate.

8. The coated thermoplastic article of claim 1 wherein said thermoplastic substrate is a polyester terephthalate resin substrate.

9. The coated thermoplastic article of claim 1 wherein the multifunctional acrylated aliphatic urethane has the general formula:

##STR8## wherein each A¹ is independently selected from the group consisting of monovalent radicals of the formula;

##STR9## wherein each E¹ is independently selected from the group consisting of hydrogen and monovalent aliphatic hydrocarbon radicals having from 1 to 13 carbon atoms, wherein m is an integer from 1 to 3, wherein each B¹ is independently selected from the group of respective m+1 valent aliphatic hydrocarbon radicals having from 1 to 8 carbon atoms;

wherein each Y¹ is independently selected from divalent radicals of the formula;

##STR10## wherein each B² is selected from the group consisting of hydrogen and monovalent aliphatic hydrocarbon radicals having from 1 to 8 carbon atoms;

wherein B³ is a divalent aliphatic hydrocarbon radical having from 1 to 8 carbon atoms; and

wherein D¹ is selected from the group consisting of divalent radicals of;

(a) polyesters having the formula;

##STR11## and (b) polydimethylsiloxane diols having the formula;

##STR12## wherein Y⁴, Y⁵, Y⁶ and Y⁷ are each independently selected from the group consisting of divalent aliphatic hydrocarbons having from 1 to 8 carbon atoms, and r is from 1 to 500.

10. A coated thermoplastic article having an abrasion resistant coating adhered to a thermoplastic substrate, the coating being the ultraviolet radiation cured reaction products of a solventless composition comprising:

(a) hexanediol diacrylate present at a level of from 10 percent by weight to 60 percent by weight based on the total weight of the composition;

(b) at least one acrylate functionalized colloidal silica present at a level of from 20 percent by weight to 40 percent by weight based on the total weight of the composition;

(c) at least one multifunctional acrylated polyurethane present at a level of from 5 percent by weight to 40 percent by weight based on the total weight of the composition;

(d) at least one ultraviolet light absorber present at a level of from 5 percent by weight to 10 percent by weight based on the total weight of the composition; and

(e) at least one photoinitiator present at a level of from 1 percent by weight to 5 percent by weight based on the total weight of the composition.

11. The coated thermoplastic article of claim 10 wherein said thermoplastic substrate is an aromatic polycarbonate resin substrate.

12. A coated thermoplastic article having an abrasion resistant coating adhered to a thermoplastic substrate, the coating being the ultraviolet radiation cured reaction products of a solventless composition consisting essentially of:

(a) at least one multifunctional acrylic ester monomer present at a level of from 20 percent by weight to 50 percent by weight based on the total weight of the composition;

(b) at least one acrylate functionalized colloidal silica present at a level of from 20 percent by weight to 40 percent by weight based on the total weight of the composition;

(c) at least one multifunctional acrylated polyurethane present at a level of from 5 percent by weight to 40 percent by weight based on the total weight of the composition;

(d) at least one ultraviolet light absorber present at a level of, from 5 percent by weight to 10 percent by weight based on the total weight of the composition; and

(e) at least one photoinitiator present at a level of from 1 percent by weight to 5 percent by weight based on the total weight of the composition.

13. The article of claim 12 wherein the multifunctional acrylic ester monomer is hexanediol diacrylate.