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AssigneeLoctite Corporation
InventorsDavid M. Glaser, Anthony F. Jacobine, Paul J. Grabek
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A treatment method for polyene resins used in thiol-ene formulations, especially norbornene resins, significantly stabilizes thiol-ene compositions made from batches of polyene resin which otherwise give compositions with poor dark stability. The treatment comprises contacting the polyene with an amphoteric treating agent selected from the group consisting of silicated magnesium oxide, basic aluminum oxide, silica gel, magnesium oxide, magnesium hydroxide, calcium oxide, calcium hydroxide, barium oxide, and barium hydroxide, and then separating the resin from the treating agent prior to mixture with a polythiol to form a thiol-ene composition. The treatment method significantly reduces ionic content in polyene resins, particularly chloride ion but also sodium and potassium ions. Consequently, treatment is also beneficial with polyene resins which do not produce substantial dark stability problems. Reduction of the ionic content of the resin is desirable to produce cured thiolene polymers with low electrical conductivity and low corrosiveness.
A treatment method for a polyene, the polyene being a plural norbornene functional compound and the method comprising contacting the untreated polyene with an amphoteric treating agent selected from the group consisting of silicated magnesium oxide, basic aluminum oxide, silica gel, magnesium oxide, magnesium hydroxide, calcium oxide, calcium hydroxide, barium oxide, and barium hydroxide for a contact time and the separating the treated polyene from the treating agent, the contact time being a sufficient time to yield a Cl.sup.- level in the polyene of less than 1.0 ppm after separation from the treating agent.
A method of preparing a thiol-ene composition comprising:
A method for improving the storage stability of a thiol-ene composition, the composition comprising a mixture of a polythiol and a polyene in amounts effective to cure by addition reaction of thiol groups of the polythiol to ene groups of the polyene so as to form a crosslinked polythioether, the polyene being a compound having plural norbornene groups thereon, the method comprising:
Dependencies are inferred from the claim text.