Organoalkoxysilane coating compositions for plastic articles

• US 4,291,098 A
• Filed: 01/09/1980
• Issued: 09/22/1981
• Est. Priority Date: 01/22/1979
• Status: Expired due to Term

• Current Assignee: Nippon Aspherical Lens Co. Ltd., Nippon Fine Chemical Co., Ltd.
• Original Assignee: Nippon Aspherical Lens Co. Ltd., Nippon Fine Chemical Co., Ltd.
• Inventors: Suzuki, Masaharu, Tanaka, Mitsuaki
• Primary Examiner(s): Lusignan, Michael R.
• Assistant Examiner(s): Page, Thurman K.
• Application Number:
  US06/110,744
• Time in Patent Office: 622 Days
• Field of Search: 427/386, 427/387, 427/165, 427/164, 427/163, 427/168, 427/169, 427/167, 427/421, 427/439, 427/430.1, 428/412, 428/447, 428/413, 428/417, 264/1, 351/166, 528/94, 528/88, 528/118, 528/408, 525/476, 260/33.4 EP, 260/32.8 N, 260/33.2 EP, 260/33.6 EP, 260/31.2 R, 260/31.2 N
• US Class Current: 428/412
• CPC Class Codes: C08G 77/04 Polysiloxanes
• 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 7/043 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: C08L 2666/36 Nitrogen-containing compounds
• CPC Class Codes: C09D 183/04 Polysiloxanes
• 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: Y10T 428/31507 Of polycarbonate
• CPC Class Codes: Y10T 428/31511 Of epoxy ether
• CPC Class Codes: Y10T 428/31525 Next to glass or quartz
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane

Abstract

This invention provides a composition for coating plastics articles comprising (A) a hydrolyzed product of an organoalkoxysilane represented by the formula

R.sup.1.sub.n Si(OR.sup.2).sub.4-n                         (I)

wherein R¹ is a saturated or unsaturated hydrocarbon residue having 1 to 4 carbon atoms, R² is a saturated hydrocarbon residue having 1 to 4 carbon atoms, and n is 0, 1 or 2, (B) an epoxy resin having an epoxy equivalent of about 120 to about 700, and (C) a bicyclic amidine represented by the formula ##STR1## wherein m is 3 or 5, or a salt thereof; a method of coating plastics articles with use of the composition; and plastics articles having a cured coating of the composition.

Claims

1. A composition for coating plastics articles comprising

(A) 100 parts by weight of hydrolyzed product of an organoalkoxysilane represented by the formula

View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)

2. A composition as defined in claim 1 wherein the organoalkoxysilane is represented by the formula (I) in which R¹ is alkyl having 1 to 4 carbon atoms or alkenyl having 1 to 4 carbon atoms, R² is alkyl having 1 to 4 carbon atoms and n is 1.

3. A composition as defined in claim 2 wherein the organoalkoxysilane is represented by the formula (I) in which R¹ is methyl, ethyl or vinyl, R² is methyl or ethyl and n is 1.

4. A composition as defined in claim 3 wherein the organoalkoxysilane is methyltrimethoxysilane.

5. A composition as defined in claim 1 wherein the epoxy resin has an epoxy equivalent of about 150 to about 500.

6. A composition as defined in claim 5 wherein the epoxy resin has an epoxy equivalent of about 170 to about 300.

7. A composition as defined in claim 1 wherein the epoxy resin is of the bisphenol type.

8. A composition as defined in claim 1 wherein the epoxy resin is used in an amount of about 1.5 to about 8 parts by weight per 100 parts by weight of the hydrolyzed product.

9. A composition as defined in claim 1 wherein the bicyclic amidine or a salt thereof is used in an amount of about 0.1 to about 4 parts by weight per 100 parts by weight of hydrolyzed product.

10. A composition as defined in claim 1 which is in the form of an organic solvent solution.

11. A method of coating a plastics article comprising applying a composition to the surface of the plastics article and forming a cured coating of the composition thereon, the composition comprising

(A) 100 parts by weight of hydrolyzed product of an organoalkoxysilane represented by the formula

View Dependent Claims (12, 13)

12. A method as defined in claim 11 wherein the plastics article is made of a polycarbonate resin.

13. A method as defined in claim 11 wherein the composition is applied in the form of an organic solvent solution to the plastics article and then heated at a temperature of about 70°

to about 150°

C.

14. A plastics article having a cured coating of a composition comprising

(A) 100 parts by weight of hydrolyzed product of an organoalkoxysilane represented by the formula