One of the purposes of the present invention is to provide a blocking agent for blocking an isocyanate group to thereby prepare an isocyanate compound which has excellent water resistance and is react with another polymerizable compound to be cured at a relatively low temperature; and another purpose is to provide a blocked isocyanate having an isocyanate group blocked with the blocking agent. The present invention provides a blocking agent for blocking an isocyanate group, wherein the blocking agent is an organic silicon alcohol having an organic group bonded to a silicon atom and said organic group is capable of forming a β-silyl cation together with the silicon atom. In a preferred embodiment, the present invention provides a blocking agent which is an organic silicon alcohol represented by the general formula (1). In the formula (1), R.sup.1 is an alkylene group having 3 to 5 carbon atoms and may have a substituent, provided that the number of carbon atoms of the substituent is not included in the number of the carbon atoms of the alkylene group, R.sup.2 is an alkyl group having 1 to 10 carbon atoms, Z is an organic group capable of forming a β-silyl cation together with the silicon atom to which Z bonds, and n is an integer of 1 to 3. The present invention further provides a blocked isocyanate having a structure in which the isocyanate group is blocked with the aforesaid blocking agent and a thermosetting composition comprising the blocked isocyanate.

A method is provided for bonding substrates having dissimilar coefficients of thermal expansion, using a thermoset adhesive. The method involves a pre-cure step using radio-frequency energy, followed by a heat-curing step.

It is an object of the present invention to provide a monomer which can provide a cured product having both high toughness and rigidity. The present invention is a (meth)acrylate (D) which is a reaction product of a thiol compound (A) having two or more mercapto groups; an iso(thio)cyanate compound (B) having two or more iso(thio)cyanato groups; and a hydroxy (meth)acrylate compound (C) having one or more polymerizable groups.

Disclosed is a hydrophilic and oxygen permeable polymer material, including alicyclic Isocyanate, a grafted repeating unit with silicon-containing monomer, and a first hydrophilic moisturing grafted monomer. The grafted repeating unit has an average molecular weight less than or equal 5,000, and is in an amount of 20-60% based on the total weight of the hydrophilic and oxygen permeable polymer material. The first hydrophilic moisturing grafted monomer is in an amount of 1-40% based on the total weight of the hydrophilic and oxygen permeable polymer material.

A polymer has urethane or thiourethane units, which can be used, in particular, as an adhesion primer for the adhesive bonding of metal or glass to rubber. The polymer comprises base units comprising at least a sub-unit of formula X.sub.1CONH, in which X.sub.1 respectively represents O or S, and additional units comprising at least a secondary alcohol function and a thioether function in the position relative to the alcohol function. The polymer can be used as an adhesion primer for the adhesive bonding of a substrate, for example glass or metal, to an unsaturated rubber, or as a corrosion-resistant protective coating for a metal substrate. A metal reinforcer, such as wire, cord, film or plate, can be coated with the polymer.

One of the purposes of the present invention is to provide a blocking agent for blocking an isocyanate group to thereby prepare an isocyanate compound which has excellent water resistance and is react with another polymerizable compound to be cured at a relatively low temperature; and another purpose is to provide a blocked isocyanate having an isocyanate group blocked with the blocking agent. The present invention provides a blocking agent for blocking an isocyanate group, wherein the blocking agent is an organic silicon alcohol having an organic group bonded to a silicon atom and said organic group is capable of forming a -silyl cation together with the silicon atom. In a preferred embodiment, the present invention provides a blocking agent which is an organic silicon alcohol represented by the general formula (1). In the formula (1), R.sup.1 is an alkylene group having 3 to 5 carbon atoms and may have a substituent, provided that the number of carbon atoms of the substituent is not included in the number of the carbon atoms of the alkylene group, R.sup.2 is an alkyl group having 1 to 10 carbon atoms, Z is an organic group capable of forming a -silyl cation together with the silicon atom to which Z bonds, and n is an integer of 1 to 3. The present invention further provides a blocked isocyanate having a structure in which the isocyanate group is blocked with the aforesaid blocking agent and a thermosetting composition comprising the blocked isocyanate.

The invention includes a composition comprising a vinyl sulfone monomer, a thiol monomer, and optionally an isocyanate monomer. The invention further includes a composition comprising a composition comprising the tetra(2-mercapto)silane (SiTSH) monomer and at least one selected from the group consisting of (a) a Michael acceptor, optionally an isocyanate monomer, and optionally at least one catalyst selected from the group consisting of a base, nucleophile, photolabile base, photolabile nucleophile, and mixtures thereof; (b) an ene monomer, and optionally a polymerization photoinitiator. In certain embodiments, once the composition is polymerized, the polymerized system is suitable for use as a dental composite system. In other embodiments, the polymerized system is stable to acidic and basic conditions. In yet other embodiments, the polymerized system forms microparticles. The invention further includes a method of generating a dental polymeric material.

It is an object of the present invention to provide a monomer which can provide a cured product having both high toughness and rigidity. The present invention is a (meth)acrylate (D) which is a reaction product of a thiol compound (A) having two or more mercapto groups; an iso(thio)cyanate compound (B) having two or more iso(thio)cyanato groups; and a hydroxy (meth)acrylate compound (C) having one or more polymerizable groups.

It is an object of the present invention to provide a monomer which can provide a cured product having both high toughness and rigidity. The present invention is a (meth)acrylate (D) which is a reaction product of a thiol compound (A) having two or more mercapto groups; an iso(thio)cyanate compound (B) having two or more iso(thio)cyanato groups; and a hydroxy (meth)acrylate compound (C) having one or more polymerizable groups.