초록 ▼

A composition is disclosed in which a solid isocyanate compound such as toluene-diisocyanate dimer is dispersed within a polyurethane based on a hydroxy-terminated organic compound, preferably polybutadiene. The composition can be fully cured on a surface and yet provides an excess of stable materia

A composition is disclosed in which a solid isocyanate compound such as toluene-diisocyanate dimer is dispersed within a polyurethane based on a hydroxy-terminated organic compound, preferably polybutadiene. The composition can be fully cured on a surface and yet provides an excess of stable material, i.e. dormant isocyanate containing groups, which are reactive on demand to strengthen interfaces with adjacent layers containing available hydroxyl groups, such as a layer of solid polyurethane-based propellant, without the need for intermediate reactive coatings.

대표청구항 ▼

A method of improving the adherence of a layer of a first composition containing organic active hydrogen compounds to a surface comprising the steps of: applying to said surface a film of a composition comprising polyurethane forming components having dispersed therein a stable, solid polyisocyanate

A method of improving the adherence of a layer of a first composition containing organic active hydrogen compounds to a surface comprising the steps of: applying to said surface a film of a composition comprising polyurethane forming components having dispersed therein a stable, solid polyisocyanate precursor additive in an amount in excess of the amount necessary to form the polyurethane and which is reactive after cure of the composition with said compounds; curing said composition to form a polyurethane film containing excess stable, solid polyisocyanate precursor additive; applying said layer to said film; and curing said layer and reacting said active hydrogen compounds with said excess additive to form bonds binding said film to said layer. to 3.0.