The present application relates to an adhesive composition including a naturally occurring acid, a nitrogen compound, and a latex; and a rubber reinforcing material and an article including the same.

The present application relates to an adhesive composition including a naturally occurring acid, a nitrogen compound, and a latex; and a rubber reinforcing material and an article including the same.

A blocked isocyanate has an isocyanate group of a polyisocyanate compound blocked with one or more blocking agents including a first blocking agent, which is represented by general formula (1). At least some of the first blocking agent has been neutralized with acid.

##STR00001##

(wherein R.sup.1 to R.sup.5 each represent a hydrogen atom or a hydrocarbon group having 1 to 12 carbon atoms; R.sup.1 and R.sup.3 may be bonded to each other to form a heterocycle, R.sup.4 and R.sup.1 may be bonded to each other to form a heterocycle, and R.sup.5 and R.sup.3 may be bonded to each other to form a heterocycle).

A blocked isocyanate has an isocyanate group of a polyisocyanate compound blocked with one or more blocking agents including a first blocking agent, which is represented by general formula (1). At least some of the first blocking agent has been neutralized with acid.

##STR00001##

(wherein R.sup.1 to R.sup.5 each represent a hydrogen atom or a hydrocarbon group having 1 to 12 carbon atoms; R.sup.1 and R.sup.3 may be bonded to each other to form a heterocycle, R.sup.4 and R.sup.1 may be bonded to each other to form a heterocycle, and R.sup.5 and R.sup.3 may be bonded to each other to form a heterocycle).

The present disclosure provides a cross-linking enhanced meta-aramid and a preparation method therefor. In the method, an isocyanate is used as a cross-linking agent, treatment is performed for a period of time at a certain temperature after a catalyst is added, and then water washing, drying, and heat setting are performed to prepare a high-strength meta-aramid. With the present disclosure, a cross-linked meta-aramid is prepared and has an improved binding force between fibers and has excellent mechanical properties and high temperature resistance.

The present disclosure provides a cross-linking enhanced meta-aramid and a preparation method therefor. In the method, an isocyanate is used as a cross-linking agent, treatment is performed for a period of time at a certain temperature after a catalyst is added, and then water washing, drying, and heat setting are performed to prepare a high-strength meta-aramid. With the present disclosure, a cross-linked meta-aramid is prepared and has an improved binding force between fibers and has excellent mechanical properties and high temperature resistance.

The invention discloses a composition for fiber surface treatment and a process for treating a fiber. The fiber surface treatment composition of the invention includes maleic anhydride polymer, epoxy resin, blocked isocyanate, curing agent, rubber latex, solvent and optional filler. The fiber treated by the invention has excellent adhesion effects, reaching or even exceeding the adhesion level of RFL treatment.

The invention discloses a composition for fiber surface treatment and a process for treating a fiber. The fiber surface treatment composition of the invention includes maleic anhydride polymer, epoxy resin, blocked isocyanate, curing agent, rubber latex, solvent and optional filler. The fiber treated by the invention has excellent adhesion effects, reaching or even exceeding the adhesion level of RFL treatment.

A method for functionalizing the surface of a substrate, performed in a supercritical fluid medium, may include: (i) providing a substrate having labile hydrogen functions on the surface; (ii) bringing the substrate into contact, in a supercritical fluid, with at least one organic molecule carrying at least one blocked isocyanate function which can be activated by heating; and (iii) subjecting the whole to a temperature sufficient to bring about the release of the blocked isocyanate function carried by the molecule, and the covalent grafting of the molecule by reaction of the isocyanate function with a labile hydrogen function on the surface of the substrate.

A method for functionalizing the surface of a substrate, performed in a supercritical fluid medium, may include: (i) providing a substrate having labile hydrogen functions on the surface; (ii) bringing the substrate into contact, in a supercritical fluid, with at least one organic molecule carrying at least one blocked isocyanate function which can be activated by heating; and (iii) subjecting the whole to a temperature sufficient to bring about the release of the blocked isocyanate function carried by the molecule, and the covalent grafting of the molecule by reaction of the isocyanate function with a labile hydrogen function on the surface of the substrate.