Method for curing an organic coating using condensation heating and radiation energy

• US 4,975,300 A
• Filed: 09/30/1988
• Issued: 12/04/1990
• Est. Priority Date: 12/31/1987
• Status: Expired due to Fees

• Current Assignee: 3M Company
• Original Assignee: 3M Company
• Inventors: Deviny, Edward J.
• Primary Examiner(s): Pianalto, Bernard
• Application Number:
  US07/251,678
• Time in Patent Office: 795 Days
• Field of Search: 427/55, 427/54.1, 427/384, 427/385.5, 427/389, 427/377, 427/335, 118/48, 118/423, 118/642, 118/61
• US Class Current: 427/509
• CPC Class Codes: B05D 3/0473 for heating, e.g. vapour heating
• CPC Class Codes: B05D 3/066 involving also the use of a gas
• CPC Class Codes: F26B 21/145 Condensing the vapour onto the surface of the materials to be dried using condensing steam F26B3/00; using chemical liquids F26B5/005
• CPC Class Codes: F26B 3/283 in combination with convection

Abstract

Coatings are cured by simultaneous exposure to radiant energy and condensing inert perfluorochemical vapors.

Claims

1. A method for curing a free-radically polymerizable radiation-curable organic coating composition, said composition being insoluble or indispersible in inert perfluorochemical liquid, comprising the steps of

(A) coating said composition on a substrate, and then

(B) exposing said coating to condensing inert perfluorochemical vapors, said vapors being produced by boiling or heating said inert perfluorochemical liquid, and simultaneously exposing said coating to radiant energy, whereby said coating is cured to a solvent resistant state.

2. A method according to claim 1, wherein said coating composition comprises an acrylate or methacrylate resin.

3. A method according to claim 1, wherein said perfluorochemical boils between about 50°

C. and about 150°

C.

4. The method of claim 1 wherein said organic coating comprises bireactive monomer, oligomer, or prepolymer.

5. A method according to claim 1 wherein said radiant energy comprises UV radiation.

6. A method for curing a cationically-polymerizable, radiation-curable organic coating composition, said composition being insoluble or indispersible in inert perfluorochemical liquid, comprising the steps of

(A) coating said composition on a substrate, and then

(B) exposing said coating to condensing inert perfluorochemical vapor said vapor being a least 120°

C. and being produced by boiling or heating said inert perfluorochemical liquid, and

(C) exposing said coating to radiant energy, whereby said coating is cured to a solvent resistant state.

7. A method according to claim 16, wherein said coating composition comprises an epoxy resin.