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Heat curable adhesive coating
| Details |
Inventors: Read, Michael J.; Read, Michael R.; Osborne, Stephen J.; Hakes, Geoffrey P.;
Assignee: Raychem Limited (London, GB)
Primary Examiner: Pertilla; Theodore E.
Assistant Examiner:
Attorney, Agent or Firm: Chao; Yuan, Rice; Edith A., Burkard; Herbert G.
Cohesive flexible curable adhesive coatings formed from a dispersion of first and second powdered curing components, preferably reactive at ambient temperatures, in a solution of a binder, the binder content being not more than 15%, preferably not more than 2.5% by weight of the dried composition. Also claimed are curable compositions having a specific advantageous reactive particle size distribution; specific epoxy-amine adduct curing agents; and specific polyalkylene oxide binders. |
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DETAILED DESCRIPTION we claim: 1.
A heat curable-adhesive coating on a substrate made by coating comprising a mixture of substantially solid particles of a first reactive component with separate substantially solid particles of at least a second reactive component, the first and second reactive components being capable of reacting together to effect curing when the coating is heated to the curing temperature, and the particles having a size distribution in which not more than 40% by weight of the particles are less than 50 micrometers in size and substantially all the particles are less than 300 micrometers in size.
2.
A coating according to claim 1, further including a polymeric binder which is substantially unreactive with the first and second reactive components at least at ambient temperatures.
3.
A coating according to claim 2, comprising not more than 15% by weight of the binder.
4.
A coating according to claim 3, comprising 0.
5 to 5% by weight of the binder.
5.
A coating according to claim 4, comprising not more than 2.
5% by weight of the binder.
6.
A coating according to claim 2, 3, or 4, comprising at least 1% by weight of the binder.
7.
A coating according to claim 2, wherein the particles of the first reactive component are connected to those of the second reactive component substantially only by the binder.
8.
A coating according to claim 1, wherein one of the reactive components is a thermoplastic epoxy resin.
9.
A coating according to claim 8, wherein the or at least one other reactive component is a material having reactive amine groups.
10.
A coating according to claim 8, wherein the or at least one other reactive component is an adduct of the epoxy resin with a compound containing reactive amine groups.
11.
A coating according to claim 9 or 10, wherein the material having reactive amine groups is a polyamide.
12.
A coating according to claim 9 or 10, wherein the material containing reactive amine groups is ethylene diamine or ethylene triamine.
13.
A coating according to claim 1, wherein the particles have a size distribution in which not more than 30% by weight of the particles are less than 50 micrometers in size
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