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

• US 5,604,271 A
• Filed: 12/21/1995
• Issued: 02/18/1997
• 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): WILSON, DONALD R
• Application Number:
  US08/576,841
• Time in Patent Office: 425 Days
• Field of Search: 523/454, 523/455, 523/456, 525/525
• US Class Current: 523/454
• 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

Compositions and methods of use are presented suitable for use in priming a first plastic surface, such as an automobile bumper facie, for adhesion of a second plastic material thereto, such as an epoxy resin. The compositions comprise an epoxy resin and a priming solvent, where the epoxy resin is derived from the reaction product of a first organic material having a plurality of epoxy-functional groups and a second organic material, the second organic material being the combination of a material having a plurality of amine-functional groups and a material having a plurality of mercaptan-functional groups. The first and second organic materials are initially dissolved or dispersed in their respective organic solvents, the two solvents making up the priming solvent. The priming solvent is adapted to wet and penetrate but not be substantially retained by the first plastic surface where applied thereto. Kits useful in repairing plastic surfaces using the compositions of the invention are also presented.

Claims

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

A. 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 the first organic solvent to dissolve or disperse the first organic material in the first organic solvent, the first organic solvent comprising a combination of;

a. a hydrocarbon having from 4 to 10 carbon atoms;

b. an alcohol having from 3 to 10 carbon atoms; and

c. an ester having from 3 to 10 carbon atoms,

with the proviso that the first organic material is soluble in the combination of a, b and c; and

B. 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 the second organic solvent to dissolve or disperse the second organic material in the second organic solvent, the second organic solvent comprising a combination of;

a'"'"'. a hydrocarbon having from 4 to 10 carbon atoms;

b'"'"'. an alcohol having from 3 to 10 carbon atoms; and

c'"'"'. a ketone having from 3 to 10 carbon atoms,

with a proviso that the second organic material is soluble in the combination of a'"'"', b'"'"' and c'"'"', the second organic material and the first organic material present in an equivalent weight ratio ranging from about 4;

1 to about 1;

6, wherein the mixture of the first and second organic solvents comprise the priming solvent and the epoxy resin comprises a reaction product of said first and said second organic materials, the priming solvent present in an amount sufficient to wet and penetrate, but not be substantially retained in the first plastic surface where applied thereto.

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

3. A composition in accordance with claim 1 wherein said second plastic material comprises a cured epoxy resin.

4. A composition in accordance with claim 1 wherein said first organic material comprises a reaction product of bisphenol A and epichlorohydrin.

5. A composition in accordance with claim 1 wherein said first organic solvent has a solubility parameter ranging from about 7 to about 13 Hildebrand units.

6. A composition in accordance with claim 1 wherein said second organic solvent has a solubility parameter ranging from about 7 to about 13 Hildebrand units.

7. A composition in accordance with claim 1 adapted so that when equal portions of said first composition and said second composition are mixed to form said priming composition, said priming composition has a weight percent solids ranging from about 10 to about 30 weight percent.

8. A composition in accordance with claim 7 having a weight percent solids ranging from about 15 to about 20 percent.

9. A composition in accordance with claim 1 wherein a and a'"'"' are both heptane, b and b'"'"' are both isopropyl alcohol, c is ethyl acetate, and c'"'"' is methyl ethyl ketone.