Universal adhesion promoting composition for plastics repair, kit including same, and method of use

• US 5,470,605 A
• Filed: 05/09/1994
• Issued: 11/28/1995
• Est. Priority Date: 06/10/1993
• Status: Expired due to Fees

• Current Assignee: 3M Company
• Original Assignee: 3M Company
• Inventors: Lundeen, Richard H.
• Primary Examiner(s): BELL, JANYCE A
• Application Number:
  US08/239,697
• Time in Patent Office: 568 Days
• Field of Search: 427/140, 427/11, 427/386, 427/393.5, 427/412.2, 427/412.3, 427/412.1
• US Class Current: 427/11
• CPC Class Codes: B05C 17/002 with feed system for supplying material from an external source; Supply controls therefor B05C17/02 takes precedence
• CPC Class Codes: C08J 2363/00 Characterised by the use of epoxy resins; Derivatives of epoxy resins
• CPC Class Codes: C08J 2463/00 Characterised by the use of epoxy resins; Derivatives of epoxy resins
• CPC Class Codes: C08J 3/091 characterised by the chemical constitution of the organic liquid
• CPC Class Codes: C08J 5/124 using adhesives based on a macromolecular component
• 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

Abstract

A composition suitable for use in priming a first plastic surface for adhesion of a second plastic material thereto is presented, the composition comprising an epoxy resin and a solvent, the composition derived from the combination of:

a. a first composition comprising a first organic material having a plurality of epoxy-functional groups, the first organic material dispersed in a first organic solvent; and

b. a second composition comprising a second organic material having at least one functional group reactive with epoxy-functional groups of the first organic material, the second organic material dispersed in a second organic solvent,

wherein the first and second organic solvents comprise the solvent and the epoxy resin comprises the reaction product of the first and second organic materials, the solvent adapted to wet and penetrate but not be substantially retained by the first plastic surface where applied thereto.

Claims

1. A method of repairing a first plastic surface with a second plastic material, said method comprising a sequence of steps of:

(a) applying to said first plastic surface a priming composition comprising;

(1) a first composition comprising a first organic material having a plurality of epoxy-functional groups, said first organic material combined with a first organic solvent in a sufficient amount of said first organic solvent to dissolve or disperse said first organic material, the first organic solvent comprising the combination of;

(i) a hydrocarbon having from 4 to 10 carbon atoms;

(ii) an alcohol having from 3 to 10 carbon atoms; and

(iii) an ester having from 3 to 10 carbon atoms,

with a proviso that said first organic material is soluble in said combination of (i), (ii) and (iii); and

(2) a second composition comprising a second organic material comprising a major portion of a mercaptan-terminated polymer having a plurality of mercaptan-functional groups and a minor portion of an amine-functional material having a plurality of amine-functional groups, said second organic material combined with a second organic solvent in a sufficient amount of said second organic solvent to dissolve or disperse said second organic material in said second organic solvent, said second organic solvent comprising the combination of;

(i'"'"') a hydrocarbon having from 4 to 10 carbon atoms;

(ii'"'"') an alcohol having from 3 to 10 carbon atoms; and

(iii'"'"') a ketone having from 3 to 10 carbon atoms,

with a proviso that said second organic material is soluble in said combination of (i'"'"'), (ii'"'"'), and (iii'"'"'), said second organic material and said first organic material present in an equivalent weight ratio ranging from about 4;

1 to about 1;

6;

(b) scrubbing into said first plastic surface said priming composition with a nonwoven article while said first and second organic solvents wet and penetrate but are not substantially retained by said first plastic surface;

(c) allowing said first plastic surface to stand for a duration of time sufficient to facilitate substantially complete evaporation of said first and second organic solvents;

(d) allowing said first organic material and said second organic material to substantially react to form an epoxy resin;

(e) applying to said first plastic surface after step (d), a curable plastic mixture;

(f) allowing said curable plastic mixture to cure to form a cured plastic mixture; and

(g) abrading said cured plastic mixture and said first plastic surface after step (f) with an abrasive article, thus forming a featheredge boundary between said first plastic surface and said cured plastic mixture.

2. A method in accordance with claim 1 wherein said first plastic surface comprises a plastic material selected from the group consisting of thermoplastic polyolefins, polyurethanes, elastomers, and polyphenylene oxide/nylon rubber.

3. A method in accordance with claim 1 wherein said curable plastic mixture comprises an epoxy resin.

4. A method in accordance with claim 3 wherein said curable mixture further includes a curing agent comprised of polymeric mercaptans and amine-functional compounds, as well as said first and second organic solvents.