One-coat adhesive systems
AssigneeLord Corporation
InventorNicholas J. Gervase
Life of this patent
Estimating the term…
Abstract
Compositions comprising at least one isocyanate-functional organosilane, preferably in combination with at least one polyisocyanate, and, optimally, at least one aromatic nitroso compound having been found to be unexpectedly effective as storage-stable, single-package, one-coat adhesive systems for bonding a variety of elastomeric materials to themselves and other solid substrates, such as metal, fabric, ceramic, and the like substrates. The use of aromatic nitroso compounds is necessary with certain isocyanatosilanes and optional with others, but, in all cases, affords improved performance, especially with respect to environmental resistance.
Claims65
A heat-activable rubber-to-metal adhesive composition consisting essentially of
- (i) from about 2.5 to about 50 parts by weight of at least one isocyanatosilane selected from the group consisting of isocyanatosilane adducts of multifunctional organosilanes and polyisocyanates;
- (ii) 100-x parts by weight of at least one free polyisocyanate, wherein x is the amount, in parts by weight, of said isocyanatosilane adduct;
- (iii) from 0 to about 200 parts by weight, per 100 parts of combined weight of said isocyanatosilane adduct and said free polyisocyanate, of at least one aromatic nitroso compound;
- (iv) from 0 to about 200 parts by weight, per 100 parts of combined weight of said isocyanatosilane adduct and said free polyisocyanate, of at least one polymeric film-forming adjunct;
- and
- (v) from 0 to about 200 parts by weight, per 100 parts of combined weight of said isocyanatosilane adduct and said free polyisocyanate, of at least one inert filler material,
- said adhesive composition having an amount of total isocyanate which is greater than one molar equivalent of isocyanate per mole of isocyanatosilane adduct.
A heat-activatable rubber-to-metal adhesive composition consisting essentially of
- (i) from about 2.5 to about 50 parts by weight of at least one isocyanatosilane having the general formula ##STR23## wherein R.sup.0 is selected from the group consisting of divalent hydrocarbon and halogenated hydrocarbon radicals containing from 1 to 20 carbon atoms;
- R.sup.1 is a monovalent aliphatic, cycloaliphatic or aromatic radical having from 1 to 20 carbon atoms;
- R.sup.2 is a monovalent aliphatic, cycloaliphatic or aromatic radical having from 1 to 20 carbon atoms;
- and
- a is zero or 1;
- (ii) 100-x parts by weight of at least one free polyisocyanate, wherein x is the amount, in parts by weight, of said isocyanatosilane;
- (iii) an effective amount of at least one aromatic nitroso compound, said amount being sufficient to obtain an effective adhesive bond;
- (iv) from 0 to about 200 parts by weight, per 100 parts of combined weight of said isocyanatosilane and said free polyisocyanate, of at least one polymeric film-forming adjunct;
- and
- (v) from 0 to about 200 parts by weight, per 100 parts of combined weight of said isocyanatosilane and said free polyisocyanate, of at least one inert filler material,
- said adhesive composition having an isocyanate content greater than an amount equal to one molar equivalent of isocyanate per mole of isocyanosilane.
Dependencies are inferred from the claim text.