PRETREATMENT OF PLASTIC SURFACES BEFORE THE APPLICATION OF AN ADHERENT ORGANIC COATING

• US 3,655,423 A
• Filed: 03/03/1970
• Issued: 04/11/1972
• Est. Priority Date: 03/03/1970
• Status: Expired due to Term

• Current Assignee: Emil J. Geering, Kingso C. Lin
• Original Assignee: Emil J. Geering, Kingso C. Lin
• Inventors: Lin, Kingso C., Geering, Emil J.
• Primary Examiner(s): Katz, Murray
• Assistant Examiner(s): Sofocleous, M.
• Application Number:
  US05/015,916
• Time in Patent Office: 770 Days
• Field of Search: 117/47A,47R,72,138.8E 260/66.5F 23/105,107,109
• US Class Current: 428/413
• 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 7/06 with compositions not containing macromolecular substances
• CPC Class Codes: Y10T 428/31511 Of epoxy ether
• CPC Class Codes: Y10T 428/31551 Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]

Abstract

The adhesion of organic coatings, e.g., paints, varnishes, dyes, and the like, to plastic substrates is improved by pretreating a plastic substrate with a reaction product of elemental phosphorus and a nucleophilic reagent or an organometallic compound. Following this pretreatment, which deposits a low oxidation state phosphorus compound at the plastic surface, the thus-treated surface is coated with an organic coating composition.

Claims

2. The process of claim 1 wherein the nucleophilic reagent is of the formula MZy wherein M is an alkali metal or alkaline earth metal, y is one or two, and Z is hydroxide, alkoxide, amide, sulfite, thiosulfate, mercaptide, cyanate, thiocyanate, cyanide or azide.

3. The process of claim 2 wherein Z is alkoxide.

4. The process of claim 3 wherein the organic coating composition is a siccative coating composition.

5. The process of claim 3 wherein the organic coating composition is a polyurethane adhesive.

6. The process of claim 3 wherein the organic coating composition is an epoxY adhesive.

7. The process of claim 3 wherein the organic coating composition is a dye.

8. A plastic article having adherently bound to the surface thereof a reaction product of elemental phosphorus and a nucleophilic reagent or organometallic compound, and having an organic coating composition adherently bound to said reaction product.

9. The article of claim 8 wherein the nucleophilic reagent is an alkali metal alkoxide or an alkaline earth metal alkoxide.

10. The article of claim 9 wherein the organic coating composition is a siccative coating composition.

11. The article of claim 9 wherein the organic coating composition is a polyurethane adhesive.

12. The article of claim 9 wherein the organic coating composition is an epoxy adhesive.